FB
GND
SW
CB
SHDN
LM2840/1/2-ADJL
VOUT
VIN
L1
D1
R1
R2
VIN
CBOOT
CIN COUT
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Design
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
LM284x and LM284x-Q1 100, 300, or 600-mA 42-V Input Step-Down
DC-DC Regulator in Thin SOT
1
1 Features
1• LM2840-Q1, LM2841-Q1, and LM2842-Q1 are
Qualified for Automotive Applications
• AEC-Q100 Test Guidance With the Following:
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature
– Device HBM ESD Classification Level 2
• Input Voltage Range of 4.5 V to 42 V
• Output Current Options of 100 mA, 300 mA, and
600 mA
• Feedback Pin Voltage of 0.765 V
• 550-kHz (X) or 1.25-MHz (Y) Switching Frequency
• Low Shutdown IQ: 16-µA Typical
• Short-Circuit Protected
• Internally Compensated
• Soft-Start Circuitry
• Small Overall Solution Size (SOT-6L Package)
• Create a Custom Design Using the LM2840 With
the WEBENCH®Power Designer
•
2 Applications
• Battery-Powered Equipment
• Industrial Distributed Power Applications
• Portable Media Players
• Portable Hand-Held Instruments
3 Description
The LM284x and LM284x-Q1 devices are PWM
DC‑DC buck (step-down) regulators. With an input
range from 4.5 V to 42 V, they are suitable for a wide
range of applications, such as power conditioning
from unregulated sources. They feature a low RDSON
(0.9‑Ωtypical) internal switch for maximum efficiency
(85% typical). Operating frequency is fixed at
550 kHz (X option) and 1.25 MHz (Y option), allowing
the use of small external components while still being
able to have low output voltage ripple. Soft start can
be implemented using the Shutdown (SHDN) pin with
an external RC circuit allowing the user to tailor the
soft-start time to a specific application.
The LM2840 and LM2840-Q1 are optimized for up to
100 mA, the LM2841 and LM2841-Q1 for up to
300 mA, and the LM2842 and LM2842-Q1 for up to
600‑mA load currents. They all have a 0.765-V
nominal feedback voltage.
Additional features include: thermal shutdown, VIN
undervoltage lockout, and gate drive undervoltage
lockout. The LM284x and LM284x-Q1 are available in
a low-profile SOT-6L package.
Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LM2840, LM2840-Q1,
LM2841, LM2841-Q1,
LM2842, LM2842-Q1 SOT (6) 1.60 mm × 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
2
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
www.ti.com
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Table of Contents
1 Features.................................................................. 1
2 Applications ........................................................... 1
3 Description............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions......................... 3
6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ..................................... 3
6.2 ESD Ratings.............................................................. 3
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 4
6.5 Electrical Characteristics .......................................... 4
6.6 Typical Characteristics.............................................. 6
7 Detailed Description.............................................. 8
7.1 Overview................................................................... 8
7.2 Functional Block Diagram......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes.......................................... 9
8 Application and Implementation ........................ 10
8.1 Application Information............................................ 10
8.2 Typical Applications ................................................ 10
9 Power Supply Recommendations...................... 15
10 Layout................................................................... 16
10.1 Layout Guidelines ................................................. 16
10.2 Layout Example .................................................... 16
11 Device and Documentation Support................. 17
11.1 Custom Design With WEBENCH® Tools ............. 17
11.2 Device Support...................................................... 17
11.3 Documentation Support ........................................ 17
11.4 Related Links ........................................................ 17
11.5 Receiving Notification of Documentation Updates 17
11.6 Community Resources.......................................... 18
11.7 Trademarks........................................................... 18
11.8 Electrostatic Discharge Caution............................ 18
11.9 Glossary................................................................ 18
12 Mechanical, Packaging, and Orderable
Information........................................................... 18
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision I (September 2016) to Revision J Page
• Added this new text for Pin 4.................................................................................................................................................. 3
• Added this new line of text in Shutdown Operation section................................................................................................. 12
Changes from Revision H (April 2013) to Revision I Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes,Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section.................................................................................................. 1
• Added Thermal Information table........................................................................................................................................... 4
Changes from Revision G (April 2013) to Revision H Page
• Changed layout of National Semiconductor Data Sheet to TI format .................................................................................... 1
1CB 6 SW
2GND 5 VIN
3FB 4 SHDN
Not to scale
3
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
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5 Pin Configuration and Functions
DDC Package
6-Pin SOT
Top View
Pin Functions
PIN I/O DESCRIPTION
NO. NAME
1 CB I SW FET gate bias voltage. Connect CBOOT capacitor between CB and SW.
2 GND — Ground connection
3 FB I Feedback pin: Set feedback voltage divider ratio with VOUT = VFB (1 + (R1 / R2)). Resistors must be from
100 Ωto 10 kΩto avoid input bias errors.
4 SHDN I Logic level shutdown input. Pull to GND to disable the device and pull high to enable the device. If this function
is not used tie to VIN . DO NOT ALLOW TO FLOAT.
5 VIN I Power input voltage pin: 4.5-V to 42-V normal operating range.
6 SW O Power FET output: Connect to inductor, diode, and CBOOT capacitor.
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal
resistance, RθJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated
using: PD(MAX) = (TJ(MAX) −TA)/RθJA. Exceeding the maximum allowable power dissipation causes excessive die temperature, and the
regulator goes into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. Thermal
shutdown engages at TJ=175°C (typical) and disengages at TJ= 155°C (typical).
6 Specifications
6.1 Absolute Maximum Ratings
See (1)(2)
MIN MAX UNIT
VIN –0.3 45 V
SHDN –0.3 (VIN + 0.3 V) < 45 V
SW voltage –0.3 45 V
CB voltage above SW voltage 7 V
FB voltage –0.3 5 V
Power dissipation(3) Internally Limited
Maximum junction temperature 150 °C
Storage temperature, Tstg –65 150 °C
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
6.2 ESD Ratings VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
4
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
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(1) All limits specified at room temperature (TA= 25°C) unless otherwise specified. All room temperature limits are 100% production tested.
All limits at temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. All limits
are used to calculate Average Outgoing Quality Level (AOQL).
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT
Operating junction temperature(1) –40 125 °C
Input voltage VIN 4.5 42 V
SW voltage 42 V
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
(2) The package thermal impedance is calculated in accordance to JESD 51-7.
(3) Thermal Resistances were simulated on a 4-layer, JEDEC board
6.4 Thermal Information
THERMAL METRIC(1) LM284x, LM284x-Q1
UNITDDC (SOT)
6 PINS
RθJA Junction-to-ambient thermal resistance(2)(3) 121 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 94 °C/W
(1) All limits specified at room temperature (TA= 25°C) unless otherwise noted. Room temperature limits are production tested. Limits at
temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. Limits are used to
calculate Average Outgoing Quality Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely norm.
(3) The part numbers in this table represent both the Q1 and non-Q1 versions of the respective parts.
(4) Includes the bond wires, RDSON from VIN pin to SW pin.
(5) Current limit at 0% duty cycle. May be lower at higher duty cycle or input voltages below 6 V.
(6) Bias currents flow into pin.
6.5 Electrical Characteristics
Specifications are for TJ= 25°C unless otherwise specified. Minimum and Maximum limits are specified through test, design,
or statistical correlation. Typical values represent the most likely parametric norm at TJ= 25°C, and are provided for reference
purposes only. Unless otherwise stated the following conditions apply: VIN = 12 V.(1)(2)(3)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
IQQuiescent current
SHDN = 0 V 16 µA
TJ=−40°C to 125°C 40
Device ON, not switching 1.3
mA
TJ=−40°C to 125°C 1.75
Device ON, no load 1.35
TJ=−40°C to 125°C 1.85
RDSON Switch ON resistance See (4) 0.9 Ω
TJ=−40°C to 125°C 1.6
ILSW Switch leakage current VIN = 42 V 0µA
TJ=−40°C to 125°C 0.5
ICL Switch current limit
LM2840(5) 525 mA
TJ=−40°C to 125°C 900
LM2841(5) 525 mA
TJ=−40°C to 125°C 900
LM2842(5) 1.15 A
TJ=−40°C to 125°C 1.7
IFB Feedback pin bias current LM284[0,1,2](6) 0.1 µA
TJ=−40°C to 125°C 1
5
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
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Electrical Characteristics (continued)
Specifications are for TJ= 25°C unless otherwise specified. Minimum and Maximum limits are specified through test, design,
or statistical correlation. Typical values represent the most likely parametric norm at TJ= 25°C, and are provided for reference
purposes only. Unless otherwise stated the following conditions apply: VIN = 12 V.(1)(2)(3)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
(7) Minimum ON-time specified by design and simulation.
VFB FB Pin reference voltage 0.765 V
TJ=−40°C to 125°C 0.747 0.782
tON(min) Minimum ON-time See (7) 100 ns
TJ=−40°C to 125°C 150
tOFF(min) Minimum OFF-time X option 110 ns
TJ=−40°C to 125°C 370
Y option 104 ns
TJ=−40°C to 125°C 200
fSW Switching frequency
X option, VFB = 0.5 V 550 kHzTJ=−40°C to 125°C 325 750
X option, VFB = 0 V 140
Y option, VFB = 0.5 V 1.25 MHzTJ=−40°C to 125°C 0.95 1.5
Y option, VFB = 0 V 0.35
DMAX Maximum duty cycle X option 94%
TJ=−40°C to 125°C 88%
Y option 87%
TJ=−40°C to 125°C 81%
VUVP Undervoltage lockout
thresholds
On threshold 3.7
V
TJ=−40°C to 125°C 4.4
Off threshold 3.5
TJ=−40°C to 125°C 3.25
VSHDN Shutdown threshold Device ON 1
V
TJ=−40°C to 125°C 2.3
Device OFF 0.9
TJ=−40°C to 125°C 0.3
ISHDN Shutdown pin input bias
current
VSHDN = 2.3 V(6) 0.05
µA
TJ=−40°C to 125°C 1.5
VSHDN = 0 V 0.02
TJ=−40°C to 125°C 1.5
SWITCH CURRENT LIMIT (mA)
1.0 1.6 2.2 2.8 3.4 4.0
800
600
400
200
0
SHDN PIN VOLTAGE (V)
0.0 0.1 0.2 0.3
LOAD CURRENT (A)
0
20
40
60
80
100
EFFICIENCY (%)
VIN = 36V
VIN = 12V
VIN = 24V
0.0 0.1 0.2 0.3
LOAD CURRENT (A)
0
20
40
60
80
100
EFFICIENCY (%)
VIN = 12V
VIN = 24V
0.4 0.5 0.6
VIN = 36V
6
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
www.ti.com
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6.6 Typical Characteristics
The part numbers in this section represent both the Q1 and non-Q1 versions of the respective parts.
LM2842X VOUT = 3.3 V
Figure 1. Efficiency vs Load Current
LM2841X VOUT = 3.3 V
Figure 2. Efficiency vs Load Current
LM2840X VOUT = 8 V
Figure 3. Efficiency vs Load Current
X option
Figure 4. Switching Frequency vs Temperature
Figure 5. Input UVLO Voltage vs Temperature
Soft-Start Implementation LM284[0,1]
Figure 6. Switch Current Limit vs SHDN Pin Voltage
SWITCH CURRENT LIMIT (A)
1.1 1.7 2.3 2.8 3.4 4.0
SHDN PIN VOLTAGE (V)
1.2
1.0
0.9
0.7
0.6
0.4
7
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
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Typical Characteristics (continued)
The part numbers in this section represent both the Q1 and non-Q1 versions of the respective parts.
Soft-Start Implementation LM2842
Figure 7. Switch Current Limit vs SHDN Pin Voltage Figure 8. SHDN Pin Current vs SHDN Pin Voltage
Max Duty
Cycle Limit
OSC
DC
LIMIT
SET
+
+
-
+
PWM
Comp RESET FET
Driver
BUCK
DRIVE
+
-Error
Amp
FB
Bandgap Soft
Start Thermal
Shutdown
TSD
SHDN
Inductor
Current
Measurement
CB
SW
GND
UVLO
Comp
BG
UVLO
Voltage
Regulator
VIN
Copyright © 2016, Texas Instruments Incorporated
8
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
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7 Detailed Description
7.1 Overview
The LM284x and LM284x-Q1 SIMPLE SWITCHER®regulators are easy-to-use, non-synchronous, step-down
DC-DC converters with a wide input voltage range up to 42 V. The devices are capable of delivering up to
100‑mA, 300-mA, or 600-mA DC load current with excellent line and load regulation. These devices are available
in fixed frequency of 550 kHz and 1.25 MHz. The family requires few external components, and the pin
arrangement was designed for simple, optimum PCB layout.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Protection
The LM284x and LM284x-Q1 have dedicated protection circuitry running during normal operation to protect the
IC. The thermal shutdown circuitry turns off the power device when the die temperature reaches excessive
levels. The UVLO comparator protects the power device during supply power start-up and shutdown to prevent
operation at voltages less than the minimum input voltage. A gate drive (CB) undervoltage lockout is included to
ensure that there is enough gate drive voltage to drive the MOSFET before the device tries to start switching.
The LM284x and LM284x-Q1 also feature a shutdown mode decreasing the supply current to approximately
16 µA.
9
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
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7.4 Device Functional Modes
7.4.1 Continuous Conduction Mode
The LM284x and LM284x-Q1 contain a current-mode, PWM buck regulator. A buck regulator steps the input
voltage down to a lower output voltage. In continuous conduction mode (when the inductor current never reaches
zero at steady-state operation), the buck regulator operates in two cycles. The power switch is connected
between VIN and SW. In the first cycle of operation the transistor is closed and the diode is reverse biased.
Energy is collected in the inductor and the load current is supplied by COUT and the rising current through the
inductor. During the second cycle the transistor is open and the diode is forward biased due to the fact that the
inductor current cannot instantaneously change direction. The energy stored in the inductor is transferred to the
load and output capacitor. The ratio of these two cycles determines the output voltage. The output voltage is
defined approximately as shown in Equation 1.
D = VOUT / VIN (1)
D’ = (1 – D)
where
• D is the duty cycle of the switch (2)
D and D' are required for design calculations.
FB
GND
SW
C
B
SHDN
LM2840/1/2-ADJL
3.3V OUT
4.5V to 42V IN D1
MA2YD26
R1
3.4k
R2
1.02k
CBOOT
VIN
CIN
2.2 PF
0.1 PF
L1
15 PH
COUT
10 PF
Copyright © 2016, Texas Instruments Incorporated
10
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LM284x and LM284x-Q1 are step-down DC-DC regulators. It is typically used to convert a higher DC voltage
to a lower DC voltage with a maximum output current of 100 mA, 300 mA, or 600 mA. The following design
procedure can be used to select components for the LM284x and LM284x-Q1. Alternately, the WEBENCH®
software may be used to generate complete designs. When generating a design, the WEBENCH software uses
iterative design procedure and accesses comprehensive databases of components. See ti.com for more details
8.2 Typical Applications
8.2.1 Step-Down Converter With 3.3-V Output Voltage
Figure 9. Application Circuit, 3.3-V Output at 100 mA
8.2.1.1 Design Requirements
Table 1 lists the design parameters for this example.
Table 1. Design Parameters
DESIGN PARAMETER EXAMPLE VALUE
Input voltage 4.5 V to 42 V
Output voltage 3.3 V
Output current 0.1 A
8.2.1.2 Detailed Design Procedure
8.2.1.2.1 Custom Design With WEBENCH® Tools
Click here to create a custom design using the LM2840 device with the WEBENCH® Power Designer.
1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.
2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.
3. Compare the generated design with other possible solutions from Texas Instruments.
The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time
pricing and component availability.
In most cases, these actions are available:
L = (VIN - VOUT)VOUT
VIN x IRIPPLE x fSW
11
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
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• Run electrical simulations to see important waveforms and circuit performance
• Run thermal simulations to understand board thermal performance
• Export customized schematic and layout into popular CAD formats
• Print PDF reports for the design, and share the design with colleagues
Get more information about WEBENCH tools at www.ti.com/WEBENCH.
This section presents guidelines for selecting external components.
8.2.1.2.2 Setting the Output Voltage
The output voltage is set using the feedback pin and a resistor divider connected to the output as shown in
Typical Application Circuit. The feedback pin voltage 0.765 V, so the ratio of the feedback resistors sets the
output voltage according to Equation 3:
VOUT = 0.765 V (1 + (R1 / R2)) (3)
Typically R2 is given as 100 Ωto 10 kΩfor a starting value. To solve for R1 given R2 and VOUT, use Equation 4:
R1 = R2 ((VOUT / 0.765 V) – 1) (4)
8.2.1.2.3 Inductor Selection
The most critical parameters for the inductor are the inductance, peak current, and the DC resistance. The
inductance is related to the peak-to-peak inductor ripple current, the input and the output voltages.
(5)
A higher value of ripple current reduces inductance, but increases the conductance loss, core loss, and current
stress for the inductor and switch devices. It also requires a bigger output capacitor for the same output voltage
ripple requirement. A reasonable value is setting the ripple current to be 30% of the DC output current. Because
the ripple current increases with the input voltage, the maximum input voltage is always used to determine the
inductance. The DC resistance of the inductor is a key parameter for the efficiency. Lower DC resistance is
available with a bigger winding area. A good tradeoff between the efficiency and the core size is letting the
inductor copper loss equal 2% of the output power. See Selecting Inductors for Buck Converters for more
information on selecting inductors. A good starting point for most applications is a 10 µH to 22 µH with 1.1 A or
greater current rating for the LM2842 and LM2842-Q1 or a 0.7 A or greater current rating for the LM284x and
LM284x-Q1. Using such a rating enables the device to current limit without saturating the inductor. This is
preferable to the device going into thermal shutdown mode and the possibility of damaging the inductor if the
output is shorted to ground or other long-term overload.
Table 2. Recommended Inductors
MANUFACTURER INDUCTOR CONTACT INFORMATION
Coilcraft LPS4018, DO1608C, DO3308, and LPO2506 series www.coilcraft.com
800-3222645
MuRata LQH55D and LQH66S series www.murata.com
Coiltronics MP2 and MP2A series www.cooperbussman.com
8.2.1.2.4 Input Capacitor
A low ESR ceramic capacitor ©IN) is needed between the VIN pin and GND pin. This capacitor prevents large
voltage transients from appearing at the input. Use a 2.2-µF to 10-µF value with X5R or X7R dielectric.
Depending on construction, a ceramic capacitor’s value can decrease up to 50% of its nominal value when rated
voltage is applied. Consult with the capacitor manufacturer's data sheet for information on capacitor derating over
voltage and temperature.
8.2.1.2.5 Output Capacitor
The selection of COUT is driven by the maximum allowable output voltage ripple. The output ripple in the constant
frequency, PWM mode is approximated by Equation 6.
VRIPPLE = IRIPPLE (ESR + (1 / (8fSWCOUT))) (6)
12
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
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The ESR term usually plays the dominant role in determining the voltage ripple. Low-ESR ceramic capacitors are
recommended. Capacitors in the range of 22 µF to 100 µF are a good starting point with an ESR of 0.1 Ωor
less.
Table 3. Recommended Input and Output Capacitors
MANUFACTURER CAPACITOR CONTACT INFORMATION
Vishay Sprague 293D, 592D, and 595D series tantalum www.vishay.com
407-324-4140
Taiyo Yuden High capacitance MLCC ceramic www.t-yuden.com
408-573-4150
Cornell Dubilier ESRD seriec Polymer Aluminum Electrolytic
SPV and AFK series V-chip series www.cde.com
MuRata High capacitance MLCC ceramic www.murata.com
8.2.1.2.6 Bootstrap Capacitor
A 0.15-µF ceramic capacitor or larger is recommended for the bootstrap capacitor ©BOOT). For applications where
the input voltage is less than twice the output voltage a larger capacitor is recommended, generally 0.15 µF to 1
µF to ensure plenty of gate drive for the internal switches and a consistently low RDSON.
8.2.1.2.7 Soft-Start Components
The LM284x and LM284x-Q1 have circuitry that is used in conjunction with the SHDN pin to limit the inrush
current on start-up of the DC-DC switching regulator. The SHDN pin in conjunction with a RC filter is used to
tailor the soft start for a specific application. When a voltage applied to the SHDN pin is between 0 V and up to
2.3 V it causes the cycle-by-cycle current limit in the power stage to be modulated for minimum current limit at
0 V up to the rated current limit at 2.3 V. Thus controlling the output rise time and inrush current at start-up. The
resistor value must be selected so the current injected into the SHDN pin is greater then the leakage current of
the SHDN pin (1.5 µA) when the voltage at SHDN is equal or greater then 2.3 V.
8.2.1.2.8 Shutdown Operation
The SHDN pin of the LM284x and LM284x-Q1 is designed so that it may be controlled using 2.3 V or higher logic
signals. If the shutdown function is not to be used the SHDN pin may be tied to VIN. This input should not be
allowed to float
The maximum voltage to the SHDN pin should not exceed 42 V. If the use of a higher voltage is desired due to
system or other constraints it may be used; however, a 100 kΩor larger resistor is recommended between the
applied voltage and the SHDN pin to protect the device.
8.2.1.2.9 Schottky Diode
The breakdown voltage rating of the diode (D1) is preferred to be 25% higher than the maximum input voltage.
The current rating for the diode must be equal to the maximum output current for best reliability in most
applications. In cases where the duty cycle is greater than 50%, the average diode current is lower. In this case it
is possible to use a diode with a lower average current rating, approximately (1 – D)IOUT; however, the peak
current rating should be higher than the maximum load current. A 0.5-A to 1-A rated diode is a good starting
point.
FB
GND
SW
CB
SHDN
LM2840/1/2-ADJL
5V OUT
7V to 42V IN
R1
R2
5.62k
1.02k
D1
MA2YD26
CBOOT
VIN
CIN
2.2 PF
L1
15 PH
COUT
47 PF
0.15 PF
Copyright © 2016, Texas Instruments Incorporated
13
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
www.ti.com
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
Product Folder Links: LM2840-Q1 LM2841-Q1 LM2842-Q1 LM2841 LM2842 LM2840
Submit Documentation FeedbackCopyright © 2009–2017, Texas Instruments Incorporated
8.2.1.3 Application Curves
VIN = 12 V IOUT = 200 mA
VOUT = 3.3 V Top trace: VOUT, 10 mV/div, AC-Coupled
T = 1 µs/div Bottom trace: SW, 5 V/div, DC-Coupled
Figure 10. Switching Node and Output Voltage Waveforms
VIN = 12 V IOUT = 300 mA to 200 mA to 300 mA
VOUT = 3.3 V Top trace: VOUT, 20 mV/div, AC-Coupled
T = 200 µs/div Bottom trace: IOUT, 100 mA/div, DC-Coupled
Figure 11. Load Transient Waveforms
VIN = 12 V IOUT = 50 mA
VOUT = 3.3 V Top trace: VOUT, 1V/div, DC-Coupled
T = 40 µs/div Bottom trace: SHDN, 2V/div, DC-Coupled
Figure 12. Start-Up Waveform
8.2.2 Other Application Circuits
Figure 13 to Figure 16 show application circuit examples using the LM284x and LM284x-Q1 devices. Customers
must fully validate and test these circuits before implementing a design based on these examples. Unless
otherwise noted, the design procedures in Step-Down Converter With 3.3-V Output Voltage are applicable to
these designs.
Figure 13. Step-Down Converter With 5-V Output Voltage
FB
GND
SW
CB
SHDN
LM2840/1/2-ADJL
0.8V OUT
4.5V to 12V IN D1
MA2YD26
R1
30.9
R2
787
CBOOT
VIN
CIN
2.2 PF
L1
10 PH
COUT
100 PF
0.15 PF
Copyright © 2016, Texas Instruments Incorporated
FB
GND
SW
CB
SHDN
LM2840/1/2-ADJL
15V OUT
18V to 42V IN D1
MA2YD26
R1
28k
R2
1.5k
CBOOT
VIN
CIN
2.2 PF
L1
47 PH
COUT
22 PF
0.15 PF
Copyright © 2016, Texas Instruments Incorporated
FB
GND
SW
CB
SHDN
LM2840/1/2-ADJL
12V OUT
15V to 42V IN D1
MA2YD26
R1
14.7k
R2
1k
CBOOT
VIN
CIN
2.2 PF
L1
47 PH
COUT
22 PF
0.15 PF
Copyright © 2016, Texas Instruments Incorporated
14
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
www.ti.com
Product Folder Links: LM2840-Q1 LM2841-Q1 LM2842-Q1 LM2841 LM2842 LM2840
Submit Documentation Feedback Copyright © 2009–2017, Texas Instruments Incorporated
Figure 14. Step-Down Converter With 12-V Output Voltage
Figure 15. Step-Down Converter With 15-V Output Voltage
Figure 16. Step-Down Converter With 0.8-V Output Voltage
15
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
www.ti.com
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
Product Folder Links: LM2840-Q1 LM2841-Q1 LM2842-Q1 LM2841 LM2842 LM2840
Submit Documentation FeedbackCopyright © 2009–2017, Texas Instruments Incorporated
9 Power Supply Recommendations
The LM284x and LM284x-Q1 are designed to operate from an input voltage supply range between 4 V and 42 V.
This input supply must be able to withstand the maximum input current and maintain a voltage above 4.5 V. The
resistance of the input supply rail must be low enough that an input current transient does not cause a drop at
the device supply voltage high enough to cause a false UVLO fault triggering and system reset. If the input
supply is located more than a few inches from the device, additional bulk capacitance may be required in
addition to the ceramic input capacitors.
16
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
www.ti.com
Product Folder Links: LM2840-Q1 LM2841-Q1 LM2842-Q1 LM2841 LM2842 LM2840
Submit Documentation Feedback Copyright © 2009–2017, Texas Instruments Incorporated
10 Layout
10.1 Layout Guidelines
To reduce problems with conducted noise pickup, the ground side of the feedback network should be connected
directly to the GND pin with its own connection. The feedback network, resistors R1 and R2, must be kept close
to the FB pin, and away from the inductor to minimize coupling noise into the feedback pin. The input bypass
capacitor CIN must be placed close to the VIN pin. This reduces copper trace resistance which effects input
voltage ripple of the IC. The inductor L1 must be placed close to the SW pin to reduce EMI and capacitive
coupling. The output capacitor, COUT must be placed close to the junction of L1 and the diode D1. The L1, D1,
and COUT trace must be as short as possible to reduce conducted and radiated noise and increase overall
efficiency. The ground connection for the diode, CIN, and COUT should be as small as possible and tied to the
system ground plane in only one spot (preferably at the COUT ground point) to minimize conducted noise in the
system ground plane. See Layout Guidelines for Switching Power Supplies for more detail on switching power
supply layout considerations.
10.2 Layout Example
Figure 17. Recommended Layout
17
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
www.ti.com
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
Product Folder Links: LM2840-Q1 LM2841-Q1 LM2842-Q1 LM2841 LM2842 LM2840
Submit Documentation FeedbackCopyright © 2009–2017, Texas Instruments Incorporated
11 Device and Documentation Support
11.1 Custom Design With WEBENCH® Tools
Click here to create a custom design using the LM2840 device with the WEBENCH® Power Designer.
1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.
2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.
3. Compare the generated design with other possible solutions from Texas Instruments.
The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time
pricing and component availability.
In most cases, these actions are available:
• Run electrical simulations to see important waveforms and circuit performance
• Run thermal simulations to understand board thermal performance
• Export customized schematic and layout into popular CAD formats
• Print PDF reports for the design, and share the design with colleagues
Get more information about WEBENCH tools at www.ti.com/WEBENCH.
11.2 Device Support
11.2.1 Development Support
WEBENCH Design Center
11.3 Documentation Support
11.3.1 Related Documentation
For related documentation, see the following:
•AN-1197 Selecting Inductors for Buck Converters (SNVA038)
•AN-1149 Layout Guidelines for Switching Power Supplies (SNVA021)
11.4 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 4. Related Links
PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL
DOCUMENTS TOOLS &
SOFTWARE SUPPORT &
COMMUNITY
LM2841 Click here Click here Click here Click here Click here
LM2842 Click here Click here Click here Click here Click here
LM2840 Click here Click here Click here Click here Click here
LM2840-Q1 Click here Click here Click here Click here Click here
LM2841-Q1 Click here Click here Click here Click here Click here
LM2842-Q1 Click here Click here Click here Click here Click here
11.5 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
18
LM2840-Q1
,
LM2841-Q1
,
LM2842-Q1
LM2841
,
LM2842
,
LM2840
SNVS540J –MARCH 2009–REVISED FEBRUARY 2017
www.ti.com
Product Folder Links: LM2840-Q1 LM2841-Q1 LM2842-Q1 LM2841 LM2842 LM2840
Submit Documentation Feedback Copyright © 2009–2017, Texas Instruments Incorporated
11.6 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.7 Trademarks
E2E is a trademark of Texas Instruments.
WEBENCH, SIMPLE SWITCHER are registered trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
11.8 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.9 Glossary
SLYZ022 —TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
PACKAGE OPTION ADDENDUM
www.ti.com 28-Feb-2017
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2840XMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SE8B
LM2840XMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SE8B
LM2840XQMK/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SE9B
LM2840YMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SF1B
LM2840YQMK/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SF2B
LM2840YQMKX/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SF2B
LM2841XMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 STFB
LM2841XMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 STFB
LM2841XQMK/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SB1B
LM2841YMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 STTB
LM2841YMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 STTB
LM2841YQMK/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SB2B
LM2841YQMKX/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SB2B
LM2842XMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 STVB
LM2842XMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 STVB
LM2842XQMK/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SB3B
LM2842XQMKX/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SB3B
PACKAGE OPTION ADDENDUM
www.ti.com 28-Feb-2017
Addendum-Page 2
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2842YMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 STXB
LM2842YMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 STXB
LM2842YQMK/NOPB ACTIVE SOT-23-THIN DDC 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SB4B
LM2842YQMKX/NOPB ACTIVE SOT-23-THIN DDC 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 SB4B
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
PACKAGE OPTION ADDENDUM
www.ti.com 28-Feb-2017
Addendum-Page 3
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF LM2840, LM2840-Q1, LM2841, LM2841-Q1, LM2842, LM2842-Q1 :
•Catalog: LM2840, LM2841, LM2842
•Automotive: LM2840-Q1, LM2841-Q1, LM2842-Q1
NOTE: Qualified Version Definitions:
•Catalog - TI's standard catalog product
•Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM2840XMK-ADJL/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2840XMKX-ADJL/NOP
BSOT-
23-THIN DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2840XQMK/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2840YMK-ADJL/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2840YQMK/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2840YQMKX/NOPB SOT-
23-THIN DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2841XMK-ADJL/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2841XMKX-ADJL/NOP
BSOT-
23-THIN DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2841XQMK/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2841YMK-ADJL/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2841YMKX-ADJL/NOP SOT- DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 3-Mar-2017
Pack Materials-Page 1
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
B 23-THIN
LM2841YQMK/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2841YQMKX/NOPB SOT-
23-THIN DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2842XMK-ADJL/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2842XMKX-ADJL/NOP
BSOT-
23-THIN DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2842XQMK/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2842XQMKX/NOPB SOT-
23-THIN DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2842YMK-ADJL/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2842YMKX-ADJL/NOP
BSOT-
23-THIN DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2842YQMK/NOPB SOT-
23-THIN DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2842YQMKX/NOPB SOT-
23-THIN DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
*All dimensions are nominal
PACKAGE MATERIALS INFORMATION
www.ti.com 3-Mar-2017
Pack Materials-Page 2
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM2840XMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2840XMKX-ADJL/NOP
BSOT-23-THIN DDC 6 3000 210.0 185.0 35.0
LM2840XQMK/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2840YMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2840YQMK/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2840YQMKX/NOPB SOT-23-THIN DDC 6 3000 210.0 185.0 35.0
LM2841XMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2841XMKX-ADJL/NOP
BSOT-23-THIN DDC 6 3000 210.0 185.0 35.0
LM2841XQMK/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2841YMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2841YMKX-ADJL/NOP
BSOT-23-THIN DDC 6 3000 210.0 185.0 35.0
LM2841YQMK/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2841YQMKX/NOPB SOT-23-THIN DDC 6 3000 210.0 185.0 35.0
LM2842XMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2842XMKX-ADJL/NOP
BSOT-23-THIN DDC 6 3000 210.0 185.0 35.0
LM2842XQMK/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2842XQMKX/NOPB SOT-23-THIN DDC 6 3000 210.0 185.0 35.0
LM2842YMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2842YMKX-ADJL/NOP
BSOT-23-THIN DDC 6 3000 210.0 185.0 35.0
LM2842YQMK/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2842YQMKX/NOPB SOT-23-THIN DDC 6 3000 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
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