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LP5951
SNVS345G –JUNE 2006–REVISED DECEMBER 2014
LP5951 Micropower, 150-mA Low-Dropout CMOS Voltage Regulator
1 Features 3 Description
The LP5951 regulator is designed to meet the
1• Input Voltage Range: 1.8 V to 5.5 V requirements of portable battery-powered systems
• Output Voltage Range: 1.3 V to 3.7 V providing a regulated output voltage and low
• Excellent Line Transient Response: ±2 mV quiescent current. When switched to shutdown mode
(typical) via a logic signal at the Enable (EN) pin, the power
consumption is reduced to virtually zero.
• Excellent PSRR: –60 dB at 1 kHz typical
• Low Quiescent Current of 29 µA typical The LP5951 is designed to be stable with small 1-µF
ceramic capacitors. The device also features internal
• Small SC70-5 and SOT-23-5 Packages protection against short-circuit currents and over-
• Fast Turnon Time of 30 µs typ. temperature conditions.
• Typical < 1 nA Quiescent Current in Shutdown Performance is specified for a –40°C to 125°C
• Ensured 150-mA Output Current temperature range.
• Logic Controlled Enable 0.4 V/0.9 V The device is available in fixed output voltages in the
• Good Load Transient Response of 50 mVpp range of 1.3 V to 3.7 V. For availability, please
(typical) contact your local TI sales office.
• Thermal Overload and Short-Circuit Protection Device Information(1)
• -40°C to 125°C Junction Temperature Range PART NUMBER PACKAGE BODY SIZE (NOM)
SOT-23 (5) 2.90 mm x 1.60 mm
2 Applications LP5951 SC70 (5) 2.00 mm x 1.25 mm
General Purpose (1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
1
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.
LP5951
SNVS345G –JUNE 2006–REVISED DECEMBER 2014
www.ti.com
Table of Contents
7.3 Feature Description................................................... 8
1 Features.................................................................. 17.4 Device Functional Modes.......................................... 9
2 Applications ........................................................... 18 Application and Implementation ........................ 10
3 Description............................................................. 18.1 Application Information............................................ 10
4 Revision History..................................................... 28.2 Typical Application ................................................. 10
5 Pin Configuration and Functions......................... 39 Power Supply Recommendations...................... 13
6 Specifications......................................................... 49.1 Output Current Derating......................................... 13
6.1 Absolute Maximum Ratings ...................................... 410 Layout................................................................... 14
6.2 ESD Ratings.............................................................. 410.1 Layout Guidelines ................................................. 14
6.3 Recommended Operating Conditions....................... 410.2 Layout Example .................................................... 14
6.4 Thermal Information.................................................. 411 Device and Documentation Support................. 15
6.5 Electrical Characteristics........................................... 511.1 Device Support .................................................... 15
6.6 Enable Control Characteristics ................................. 511.2 Documentation Support ....................................... 15
6.7 Transient Characteristics .......................................... 511.3 Trademarks........................................................... 15
6.8 Output Capacitor, Recommended Specification....... 611.4 Electrostatic Discharge Caution............................ 15
6.9 Typical Characteristics.............................................. 611.5 Glossary................................................................ 15
7 Detailed Description.............................................. 812 Mechanical, Packaging, and Orderable
7.1 Overview................................................................... 8Information........................................................... 15
7.2 Functional Block Diagram......................................... 8
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (May 2013) to Revision G Page
• Added Device Information and ESD Rating tables, Feature Description,Device Functional Modes,Application and
Implementation,Power Supply Recommendations,Layout,Device and Documentation Support, and Mechanical,
Packaging, and Orderable Information sections; updated pin names; added new thermal information; moved some
curves to Application Curves section...................................................................................................................................... 1
• Changed wording of footnote 2 ............................................................................................................................................. 5
• Changed values of RθJA and "454 mW" to "511 mW" for SOT-23-5 package ................................................................... 10
Changes from Revision E (April 2013) to Revision F Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 12
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1
IN 2
GND
OUT
5NC
4
3
EN
1
IN 2
GND
OUT
5NC
4
3
EN
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SNVS345G –JUNE 2006–REVISED DECEMBER 2014
5 Pin Configuration and Functions
SOT-23 (DBV)
5 Pins
Top View
SC70 (DCK)
5 Pins
Top View
Pin Functions
PIN TYPE DESCRIPTION
NUMBER NAME
1 IN I Input voltage 1.8 V to 5.5 V
2 GND — Ground
3 EN I Enable pin logic input: Low = shutdown, High = normal operation. This pin should not
be left floating.
4 NC — No internal connection
5 OUT O Regulated output voltage
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature (unless otherwise noted)(1)
MIN MAX UNIT
IN pin: Voltage to GND –0.3 6.5 V
EN pin: Voltage to GND –0.3 to (VIN + 0.3 V)(2) 6.5
Continuous power dissipation(3) Internally limited
Junction temperature (TJ-MAX ) 150
Package peak reflow temperature (10-20 s) 240 °C
Package peak reflow temperature (Pb-free, 10-20 s) 260
Storage temperature, Tstg –65 150 °C
(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) The lower of VIN + 0.3 or 6.5 V.
(3) Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ= 160°C (typ.) and
disengages at TJ= 140°C (typ.).
6.2 ESD Ratings VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN NOM MAX UNIT
VIN Input voltage 1.8 5.5 V
VEN Enable input voltage 0 (VIN + 0.3) V
TJJunction temperature –40 125 °C
TAAmbient temperature See Power Dissipation And Device Operation
(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) All voltages are with respect to the potential at the GND pin.
6.4 Thermal Information LP5951
THERMAL METRIC(1) SOT-23 (DBV) SC70 (DCK) UNIT
5 PINS 5 PINS
RθJA Junction-to-ambient thermal resistance 195.6 276.7
RθJC(top) Junction-to-case (top) thermal resistance 108.3 86.3
RθJB Junction-to-board thermal resistance 52.1 56.9 °C/W
ψJT Junction-to-top characterization parameter 11.0 1.3
ψJB Junction-to-board characterization parameter 51.6 56.1
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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6.5 Electrical Characteristics
All typical (TYP) values and limits are for TA= TJ= 25°C, and minimum (MIN) and maximum (MAX) limits apply over the
operating junction temperature range (TJ) of –40°C to 125°C unless otherwise specified in the Test Conditions. Unless
otherwise noted, VIN = VOUT(NOM) + 1 V, CIN = 1 µF, COUT = 1 µF, VEN = 0.9 V. (1) (2)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VIN Input voltage VIN ≥VOUT(NOM) + VDO 1.8 5.5 V
IOUT = 1mA –2% 2%
TJ= 25°C
Output voltage tolerance IOUT = 1mA –3.5% 3.5%
–30°C ≤TJ≤+125°C
ΔVOUT Line regulation error VIN = VOUT(NOM) + 1 V to 5.5 V 0.1 %/V
IOUT = 1 mA
Load regulation error IOUT = 1 mA to 150 mA –0.01 %/mA
VDO Output voltage dropout(3) IOUT = 150 mA , VOUT ≥2.5 V 250 mV
IOUT = 150 mA , VOUT < 2.5 V 200 350
IQQuiescent current VEN = 0.9 V, ILOAD = 0 29 55 µA
VEN = 0.9 V, ILOAD = 150 mA 33 70
VEN = 0 V, TJ= 25°C 0.005 1
ISC Output current (short circuit) VIN = VOUT(NOM) + 1 V 150 400 mA
Sine modulated VIN, ƒ = 100 Hz 60
PSRR Power supply rejection ratio Sine modulated VIN, ƒ = 1 kHz 60 dB
Sine modulated VIN, ƒ = 10 kHz 50
ENOutput noise BW = 10 Hz - 100 kHz 125 µVRMS
TSD Thermal shutdown 160 °C
Temperature hysteresis 20
(1) All voltages are with respect to the potential at the GND pin.
(2) Minimum and Maximum limits are ensured through test, design, or statistical correlation over the operating junction temperature range
(TJ) of –40°C to 125°C, unless otherwise stated. Typical values represent the most likely parametric norm at TJ= 25°C, and are
provided for reference purposes only.
(3) Dropout voltage is defined as the input to output voltage differential at which the output voltage falls to 100 mV below the nominal output
voltage. This specification does not apply for output voltages below 1.8 V.
6.6 Enable Control Characteristics
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
IEN Maximum input current at 0 V ≤VEN ≤VIN, VIN = 5.5 V –1 1 µA
EN input –40°C ≤TJ≤125°C
Low input threshold VIN = 1.8 V to 5.5 V
VIL 0.4
(shutdown) –40°C ≤TJ≤125°C V
VIH High input threshold VIN = 1.8 V to 5.5 V 0.9
(enable) –40°C ≤TJ≤125°C
6.7 Transient Characteristics
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ΔVOUT Dynamic line transient VIN = VOUT(NOM) + 1 V to ±2 mV
VOUT(NOM) + 1 V + 0.6 V in 30 µs, no load
IOUT = 0 mA to 150 mA in 10 µs -30 mV
IOUT = 150 mA to 0 mA in 10 µs 20 mV
ΔVOUT Dynamic load transient IOUT = 1 mA to 150 mA in 1 µs -50 mV
IOUT = 150 mA to 1 mA in 1 µs 40 mV
ΔVOUT Overshoot on start-up Nominal conditions 10 mV
TON Turnon time IOUT = 1 mA 30 µs
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VIN
(500 mV/DIV)
2.9
ÂVOUT
(2 mV/DIV)
LP5951-1.3 CIN, COUT = 1.0 µF
2.3
TIME (100 µs/DIV)
IL = 150 mA
VIN
(1V/DIV)
4.9
ÂVOUT
(2 mV/DIV)
LP5951-3.3 CIN = 1.0 µF
COUT = 1.5 µF
4.3
TIME (100 µs/DIV)
IL = 150 mA
LOAD CURRENT (mA)
0
150
ÂVOUT
(20 mV/DIV)
LP5951-1.3 CIN, COUT = 1.0 µF
TIME (50 µs/DIV)
LOAD CURRENT (mA)
0
150
ÂVOUT
(20 mV/DIV)
LP5951-3.3 CIN = 1.0 µF
COUT = 1.5 µF
TIME (50 µs/DIV)
LP5951
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6.8 Output Capacitor, Recommended Specification
PARAMETER TEST CONDITIONS MIN(1) TYP MAX(1) UNIT
Capacitance(2) 0.7 1 47 µF
IOUT = 150 mA, VIN = 5 V
COUT Output capacitance ESR 0.003 0.300 Ω
(1) Min and Max limits are ensured by design.
(2) The capacitor tolerance should be 30% or better over temperature. The full operating conditions for the application should be considered
when selecting a suitable capacitor to ensure that the minimum value of capacitance is always met. Recommended capacitor type is
X7R. However, dependent on application, X5R, Y5V, and Z5U can also be used. The shown minimum limit represents real minimum
capacitance, including all tolerances and must be maintained over temperature and dc bias voltage (see External Capacitors in
Application and Implementation section).
6.9 Typical Characteristics
Unless otherwise specified, CIN = 1 µF ceramic, COUT = 1 µF ceramic, VIN = VOUT(NOM) + 1 V, TA= 25°C; EN pin is tied to VIN.
Figure 1. Load Transient Response Figure 2. Load Transient Response
Figure 4. Line Transient Response
Figure 3. Line Transient Response
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100 1k 10k 100k 1M
FREQUENCY (Hz)
-80
-60
-40
-20
0
RIPPLE REJECTION (dB)
10
LP5951-3.3
VIN = 5.5V,
IL = 1 mA
VIN = 3.8V,
IL = 1 mA
VIN = 5.5V,
IL = 0 mA
VIN = 3.8V,
IL = 0 mA
18.0
20.0
22.0
24.0
26.0
34.0
36.0
38.0
40.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
IGND (PA)
32.0
30.0
28.0
LP5951-1.3 IL = 1 mA
TA = -40oC
TA = 25oC
TA = 125oC
-40 120
TEMPERATURE (oC)
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
VOUT CHANGE (%)
10080604020-20 0
LP5951-1.3 IL = 1 mA
VEN
(500 mV/DIV)
VOUT
(500 mV/DIV)
LP5951-1.3
TIME (10 µs/DIV)
IL = 150 mA
VEN
(500 mV/DIV)
VOUT
(1V/DIV)
LP5951-3.3
TIME (10 µs/DIV)
IL = 150 mA
LP5951
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SNVS345G –JUNE 2006–REVISED DECEMBER 2014
Typical Characteristics (continued)
Unless otherwise specified, CIN = 1 µF ceramic, COUT = 1 µF ceramic, VIN = VOUT(NOM) + 1 V, TA= 25°C; EN pin is tied to VIN.
Figure 5. Enable Start-Up Time Figure 6. Enable Start-Up Time
Figure 7. Output Voltage Change vs Temperature Figure 8. Ground Current vs VIN
Figure 9. Power Supply Rejection Ratio
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Enable
Controller
Bias
Generator
Over
Current and
Thermal
Protection
LDO Core
and
Reference
IN
OUT
GND
EN
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7 Detailed Description
7.1 Overview
The LP5951 regulator is designed to meet the requirements of portable battery-powered systems providing a
regulated output voltage and low quiescent current. When switched to shutdown mode via a logic signal at the
EN pin, the power consumption is reduced to virtually zero.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 No-Load Stability
The LP5951 will remain stable and in regulation with no external load. This is an important consideration in some
circuits, for example CMOS RAM keep-alive applications.
7.3.2 Enable Operation
The LP5951 may be switched ON or OFF by a logic input at the Enable pin, EN. A logic high at this pin will turn
the device on. When the EN pin is low, the regulator output is off and the device typically consumes 5 nA.
If the application does not require the enable switching feature, the EN pin should be tied to VIN to keep the
regulator output permanently on.
To ensure proper operation, the signal source used to drive the VEN input must be able to swing above and
below the specified turn-on/off voltage thresholds listed in the Enable Control Characteristics table, VIL and VIH.
7.3.3 Fast Turn Off And On
The controlled switch-off feature of the device provides a fast turn off by discharging the output capacitor via an
internal FET device. This discharge is current limited by the RDSon of this switch.
Fast turnon is ensured by an optimized architecture allowing a very fast ramp of the output voltage to reach the
target voltage.
7.3.4 Short-Circuit Protection
The LP5951 is short circuit protected and in the event of a peak over-current condition, the output current
through the PMOS will be limited.
If the over-current condition exists for a longer time, the average power dissipation will increase depending on
the input to output voltage difference until the thermal shutdown circuitry will turn off the PMOS.
Please refer to the Thermal Information section for power dissipation calculations.
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Feature Description (continued)
7.3.5 Thermal-Overload Protection
Thermal-Overload Protection limits the total power dissipation in the LP5951. When the junction temperature
exceeds TJ= 160°C typ., the shutdown logic is triggered and the PMOS is turned off, allowing the device to cool
down. After the junction temperature dropped by 20°C (temperature hysteresis), the PMOS is activated again.
This results in a pulsed output voltage during continuous thermal-overload conditions.
The Thermal-Overload Protection is designed to protect the LP5951 in the event of a fault condition. For normal,
continuous operation, do not exceed the absolute maximum junction temperature rating of TJ= 150°C (see
Absolute Maximum Ratings).
7.3.6 Reverse Current Path
The internal PFET pass device in LP5951 has an inherent parasitic body diode. During normal operation, the
input voltage is higher than the output voltage and the parasitic diode is reverse biased. However, if the output is
pulled above the input in an application, then current flows from the output to the input as the parasitic diode gets
forward biased. The output can be pulled above the input as long as the current in the parasitic diode is limited to
50 mA.
For currents above this limit an external Schottky diode must be connected from VOUT to VIN (cathode on VIN,
anode on VOUT).
7.4 Device Functional Modes
7.4.1 Enable (EN)
The EN pin voltage must be higher than the VIH threshold to ensure that the device is fully enabled under all
operating conditions. The EN pin voltage must be lower than the VIL threshold to ensure that the device is fully
disabled. However if the application does not require the shutdown feature, the VEN pin can be tied to VIN to
keep the regulator output permanently on.
7.4.2 Minimum Operating Input Voltage (VIN)
The LP5951 internal circuitry is not fully functional until VIN is at least 1.8 V. The output voltage is not regulated
until VIN ≥(VOUT + VDO), or 1.8 V, whichever is higher.
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VIN OUT
GND
NC
IN
Enable Control,
active high
1
3
2
4
5
Load
EN
1 PF1 PF
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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 LP5951 is a linear voltage regulator for digital applications designed to be stable with space-saving ceramic
capacitors as small as 1 µF. Performance is specified for a -40°C to 125°C temperature range for bot the SOT-
23 and SC70 packages.
8.2 Typical Application
Figure 10. LP5951 Typical Application
8.2.1 Design Requirements
Table 1. Design Parameters
DESIGN PARAMETER DESIGN REQUIREMENT
Input voltage range 1.8 V to 5.5 V
Output voltage 1.3 V
Output current 150 mA
Output capacitor range 1 µF
Input/output capacitor ESR range 3 mΩto 300 mΩ
8.2.2 Detailed Design Procedure
8.2.2.1 Power Dissipation And Device Operation
The permissible power dissipation for any package is a measure of the capability of the device to pass heat from
the power source, the junctions of the IC, to the ultimate heat sink, the ambient environment. Thus, the power
dissipation is dependent on the ambient temperature and the thermal resistance across the various interfaces
between the die and ambient air.
In applications where high power dissipation and/or poor package thermal resistance is present, the maximum
ambient temperature may have to be derated. Maximum ambient temperature (TA-MAX) is dependent on the
maximum operating junction temperature (TJ-MAX-OP = 125°C), the maximum power dissipation of the device in
the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application
(RθJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (RθJA × PD-MAX).
The allowable power dissipation for the device in a given package can be calculated using the equation:
PD= (TJ(MAX) – TA) /RθJA (1)
With an RθJA = 195.6°C/W, the device in the SOT-23-5 package returns a value of 511 mW with a maximum
junction temperature of 125°C at TAof 25°C.
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The actual power dissipation across the device can be estimated by the following equation:
PD≈(VIN – VOUT)×IOUT (2)
This establishes the relationship between the power dissipation allowed due to thermal consideration, the voltage
drop across the device, and the continuous current capability of the device. These two equations should be used
to determine the optimum operating conditions for the device in the application.
8.2.2.2 External Capacitors
As is common with most regulators, the LP5951 requires external capacitors to ensure stable operation. The
LP5951 is specifically designed for portable applications requiring minimum board space and the smallest size
components. These capacitors must be correctly selected for good performance.
8.2.2.3 Input Capacitor
An input capacitor is required for stability. It is recommended that a 1-µF capacitor be connected between the
LP5951 IN pin and ground (this capacitance value may be increased without limit).
This capacitor must be located a distance of not more than 1 cm from the input pin and returned to a clean
analogue ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input.
Important: Tantalum capacitors can suffer catastrophic failures due to surge current when connected to a low-
impedance source of power (like a battery or a very large capacitor). If a tantalum capacitor is used at the input,
it must be ensured by the manufacturer to have a surge current rating sufficient for the application.
There are no requirements for the ESR (Equivalent Series Resistance) on the input capacitor, but tolerance and
temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will remain ≥
0.7 µF over the entire operating temperature range.
8.2.2.4 Output Capacitor
The LP5951 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor
(dielectric types X7R, Z5U, or Y5V) in the 1-µF range (up to 47 µF) and with ESR between 3 mΩto 500 mΩis
suitable in the LP5951 application circuit.
This capacitor must be located a distance of not more than 1 cm from the OUT pin and returned to a clean
analogue ground.
It is also possible to use tantalum or film capacitors at the device output, VOUT, but these are not as attractive for
reasons of size and cost (see Capacitor Characteristics).
8.2.2.5 Capacitor Characteristics
The LP5951 is designed to work with ceramic capacitors on the output to take advantage of the benefits they
offer. For capacitance values in the range of 1 µF to 4.7 µF, ceramic capacitors are the smallest, least expensive
and have the lowest ESR values, thus making them best for eliminating high frequency noise. The ESR of a
typical 1-µF ceramic capacitor is in the range of 3 mΩto 40 mΩ, which easily meets the ESR requirement for
stability for the LP5951.
For both input and output capacitors, careful interpretation of the capacitor specification is required to ensure
correct device operation. The capacitor value can change greatly, depending on the operating conditions and
capacitor type.
In particular, the output capacitor selection should take account of all the capacitor parameters, to ensure that the
specification is met within the application. The capacitance can vary with DC bias conditions as well as
temperature and frequency of operation. Capacitor values will also show some decrease over time due to aging.
The capacitor parameters are also dependant on the particular case size, with smaller sizes giving poorer
performance figures in general. As an example, Figure 11 shows a typical graph comparing different capacitor
case sizes in a Capacitance vs. DC Bias plot. As shown in the graph, increasing the DC Bias condition can result
in the capacitance value falling below the minimum value given in the recommended capacitor specifications
table (0.7 µF in this case). Note that the graph shows the capacitance out of spec for the 0402 case size
capacitor at higher bias voltages. It is therefore recommended that the capacitor manufacturers’ specifications for
the nominal value capacitor are consulted for all conditions, as some capacitor sizes (such as 0402) may not be
suitable in the actual application.
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0 1.0 2.0 3.0 4.0 5.0
CAP VALUE (% of Nom. 1 PF)
DC BIAS (V)
100%
80%
60%
40%
20%
0402, 6.3V, X5R
0603, 10V, X5R
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Figure 11. Typical Variation in Capacitance vs DC Bias
The ceramic capacitor’s capacitance can vary with temperature. The capacitor type X7R, which operates over a
temperature range of –55°C to 125°C, will only vary the capacitance to within ±15%. The capacitor type X5R has
a similar tolerance over a reduced temperature range of –55°C to 85°C. Many large value ceramic capacitors,
larger than 1 µF are manufactured with Z5U or Y5V temperature characteristics. Their capacitance can drop by
more than 50% as the temperature varies from 25°C to 85°C. Therefore X7R is recommended over Z5U and
Y5V in applications where the ambient temperature will change significantly above or below 25°C.
Tantalum capacitors are less desirable than ceramic for use as output capacitors because they are more
expensive when comparing equivalent capacitance and voltage ratings in the 1-µF to 4.7-µF range.
Another important consideration is that tantalum capacitors have higher ESR values than equivalent size
ceramics. This means that while it may be possible to find a tantalum capacitor with an ESR value within the
stable range, it would have to be larger in capacitance (which means bigger and more costly) than a ceramic
capacitor with the same ESR value. It should also be noted that the ESR of a typical tantalum will increase about
2:1 as the temperature goes from 25°C down to -40°C, so some guard band must be allowed.
Table 2. Suggested Capacitors and Their Suppliers
CAPACITANCE / µF MODEL VENDOR TYPE CASE SIZE / INCH (mm)
1 C1608X5R1A105K TDK Ceramic, X5R 0603 (1608)
1 C1005X5R1A105K TDK Ceramic, X5R 0402 (1005)
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VIN - VOUT / V
ILOADMAX / A
0 1 2 3 4
0
0.05
0.1
0.15
D001
SOT23-5
SC70-5
LOAD CURRENT (mA)
0
150
ÂVOUT
(20 mV/DIV)
LP5951-1.3 CIN, COUT = 1.0 µF
TIME (50 µs/DIV)
VEN
(500 mV/DIV)
VOUT
(500 mV/DIV)
LP5951-1.3
TIME (10 µs/DIV)
IL = 150 mA
LP5951
www.ti.com
SNVS345G –JUNE 2006–REVISED DECEMBER 2014
8.2.3 Application Curves
Figure 13. Enable Start-Up Time
Figure 12. Load Transient Response
9 Power Supply Recommendations
This device is designed to operate from an input supply voltage range of 1.8 V to 5.5 V. The input supply should
be well regulated and free of spurious noise. To ensure that the LP5951 output voltage is well regulated, the
input supply should be at least VOUT + 0.5 V, or 1.8 V, whichever is higher. A minimum capacitor value of 1-μF is
required to be within 1 cm of the IN pin.
9.1 Output Current Derating
Figure 14. Maximum Load Current vs VIN – VOUT,
TA= 85°C, VOUT = 1.5 V
Copyright © 2006–2014, Texas Instruments Incorporated Submit Documentation Feedback 13
Product Folder Links: LP5951
IN
GND
EN
OUT
N/C
CIN COUT
1
2
34
5
VIN
GND
Enable
VOUT
GND
LP5951
SNVS345G –JUNE 2006–REVISED DECEMBER 2014
www.ti.com
10 Layout
10.1 Layout Guidelines
The dynamic performance of the LP5951 is dependent on the layout of the PCB. PCB layout practices that are
adequate for typical LDOs may degrade the load regulation, PSRR, noise, or transient performance of the
LP5951. Best performance is achieved by placing CIN and COUT on the same side of the PCB as the LP5951,
and as close as is practical to the package. The ground connections for CIN and COUT should be back to the
LP5951 ground pin using as wide, and as short, of a copper trace as is practical.
Connections using long trace lengths, narrow trace widths, and/or connections through vias should be avoided.
These will add parasitic inductances and resistance that results in inferior performance especially during transient
conditions.
A Ground Plane, either on the opposite side of a two-layer PCB, or embedded in a multi-layer PCB, is strongly
recommended. This Ground Plane serves as a circuit reference plane to assure accuracy.
10.2 Layout Example
Figure 15. LP5951 Layout
14 Submit Documentation Feedback Copyright © 2006–2014, Texas Instruments Incorporated
Product Folder Links: LP5951
LP5951
www.ti.com
SNVS345G –JUNE 2006–REVISED DECEMBER 2014
11 Device and Documentation Support
11.1 Device Support
11.1.1 Third-Party Products Disclaimer
TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT
CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES
OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER
ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.
11.2 Documentation Support
11.2.1 Related Documentation
For the availability of evaluation boards, see the LP5951 product folder. For information regarding evaluation
boards, see the TI AN-1486 Application Report LP5951 Evaluation Board (SNVA169).
11.3 Trademarks
All trademarks are the property of their respective owners.
11.4 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.
11.5 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.
Copyright © 2006–2014, Texas Instruments Incorporated Submit Documentation Feedback 15
Product Folder Links: LP5951
PACKAGE OPTION ADDENDUM
www.ti.com 11-Jan-2021
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead finish/
Ball material
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LP5951MF-1.3/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKRB
LP5951MF-1.5/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKAB
LP5951MF-1.8/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKBB
LP5951MF-2.0/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKCB
LP5951MF-2.5/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKEB
LP5951MF-2.8/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKFB
LP5951MF-3.0/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKGB
LP5951MF-3.3 NRND SOT-23 DBV 5 1000 Non-RoHS
& Green Call TI Call TI -40 to 125 LKHB
LP5951MF-3.3/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKHB
LP5951MFX-1.3/NOPB ACTIVE SOT-23 DBV 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKRB
LP5951MFX-1.5/NOPB ACTIVE SOT-23 DBV 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKAB
LP5951MFX-1.8/NOPB ACTIVE SOT-23 DBV 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKBB
LP5951MFX-2.0/NOPB ACTIVE SOT-23 DBV 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKCB
LP5951MFX-2.5/NOPB ACTIVE SOT-23 DBV 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKEB
LP5951MFX-3.0/NOPB ACTIVE SOT-23 DBV 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKGB
LP5951MFX-3.3/NOPB ACTIVE SOT-23 DBV 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 LKHB
LP5951MG-1.3/NOPB ACTIVE SC70 DCK 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 L23
LP5951MG-1.5/NOPB ACTIVE SC70 DCK 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 L2B
LP5951MG-1.8/NOPB ACTIVE SC70 DCK 5 1000 RoHS & Green SN Level-1-260C-UNLIM L3B
LP5951MG-2.0/NOPB ACTIVE SC70 DCK 5 1000 RoHS & Green SN Level-1-260C-UNLIM L4B
PACKAGE OPTION ADDENDUM
www.ti.com 11-Jan-2021
Addendum-Page 2
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead finish/
Ball material
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LP5951MG-2.5/NOPB ACTIVE SC70 DCK 5 1000 RoHS & Green SN Level-1-260C-UNLIM L5B
LP5951MG-2.8/NOPB ACTIVE SC70 DCK 5 1000 RoHS & Green SN Level-1-260C-UNLIM L6B
LP5951MG-3.0/NOPB ACTIVE SC70 DCK 5 1000 RoHS & Green SN Level-1-260C-UNLIM L7B
LP5951MG-3.3/NOPB ACTIVE SC70 DCK 5 1000 RoHS & Green SN Level-1-260C-UNLIM LAB
LP5951MGX-1.3/NOPB ACTIVE SC70 DCK 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 L23
LP5951MGX-1.5/NOPB ACTIVE SC70 DCK 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 L2B
LP5951MGX-1.8/NOPB ACTIVE SC70 DCK 5 3000 RoHS & Green SN Level-1-260C-UNLIM L3B
LP5951MGX-2.5/NOPB ACTIVE SC70 DCK 5 3000 RoHS & Green SN Level-1-260C-UNLIM L5B
LP5951MGX-2.8/NOPB ACTIVE SC70 DCK 5 3000 RoHS & Green SN Level-1-260C-UNLIM L6B
LP5951MGX-3.0/NOPB ACTIVE SC70 DCK 5 3000 RoHS & Green SN Level-1-260C-UNLIM L7B
LP5951MGX-3.3/NOPB ACTIVE SC70 DCK 5 3000 RoHS & Green SN Level-1-260C-UNLIM LAB
(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) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(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.
PACKAGE OPTION ADDENDUM
www.ti.com 11-Jan-2021
Addendum-Page 3
(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 finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material 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
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.
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
LP5951MF-1.3/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MF-1.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MF-1.8/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MF-2.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MF-2.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MF-2.8/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MF-3.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MF-3.3 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MF-3.3/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MFX-1.3/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MFX-1.5/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MFX-1.8/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MFX-2.0/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MFX-2.5/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MFX-3.0/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MFX-3.3/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP5951MG-1.3/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MG-1.5/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 29-Sep-2019
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
LP5951MG-1.8/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MG-2.0/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MG-2.5/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MG-2.8/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MG-3.0/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MG-3.3/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MGX-1.3/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MGX-1.5/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MGX-1.8/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MGX-2.5/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MGX-2.8/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MGX-3.0/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
LP5951MGX-3.3/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LP5951MF-1.3/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP5951MF-1.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP5951MF-1.8/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP5951MF-2.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 29-Sep-2019
Pack Materials-Page 2
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LP5951MF-2.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP5951MF-2.8/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP5951MF-3.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP5951MF-3.3 SOT-23 DBV 5 1000 210.0 185.0 35.0
LP5951MF-3.3/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP5951MFX-1.3/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP5951MFX-1.5/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP5951MFX-1.8/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP5951MFX-2.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP5951MFX-2.5/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP5951MFX-3.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP5951MFX-3.3/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP5951MG-1.3/NOPB SC70 DCK 5 1000 210.0 185.0 35.0
LP5951MG-1.5/NOPB SC70 DCK 5 1000 210.0 185.0 35.0
LP5951MG-1.8/NOPB SC70 DCK 5 1000 210.0 185.0 35.0
LP5951MG-2.0/NOPB SC70 DCK 5 1000 210.0 185.0 35.0
LP5951MG-2.5/NOPB SC70 DCK 5 1000 210.0 185.0 35.0
LP5951MG-2.8/NOPB SC70 DCK 5 1000 210.0 185.0 35.0
LP5951MG-3.0/NOPB SC70 DCK 5 1000 210.0 185.0 35.0
LP5951MG-3.3/NOPB SC70 DCK 5 1000 210.0 185.0 35.0
LP5951MGX-1.3/NOPB SC70 DCK 5 3000 210.0 185.0 35.0
LP5951MGX-1.5/NOPB SC70 DCK 5 3000 210.0 185.0 35.0
LP5951MGX-1.8/NOPB SC70 DCK 5 3000 210.0 185.0 35.0
LP5951MGX-2.5/NOPB SC70 DCK 5 3000 210.0 185.0 35.0
LP5951MGX-2.8/NOPB SC70 DCK 5 3000 210.0 185.0 35.0
LP5951MGX-3.0/NOPB SC70 DCK 5 3000 210.0 185.0 35.0
LP5951MGX-3.3/NOPB SC70 DCK 5 3000 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 29-Sep-2019
Pack Materials-Page 3
www.ti.com
PACKAGE OUTLINE
C
0.22
0.08 TYP
0.25
3.0
2.6
2X 0.95
1.9
1.45
0.90
0.15
0.00 TYP
5X 0.5
0.3
0.6
0.3 TYP
8
0 TYP
1.9
A
3.05
2.75
B
1.75
1.45
(1.1)
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/E 09/2019
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Refernce JEDEC MO-178.
4. Body dimensions do not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not
exceed 0.15 mm per side.
0.2 C A B
1
34
5
2
INDEX AREA
PIN 1
GAGE PLANE
SEATING PLANE
0.1 C
SCALE 4.000
www.ti.com
EXAMPLE BOARD LAYOUT
0.07 MAX
ARROUND 0.07 MIN
ARROUND
5X (1.1)
5X (0.6)
(2.6)
(1.9)
2X (0.95)
(R0.05) TYP
4214839/E 09/2019
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
NOTES: (continued)
5. Publication IPC-7351 may have alternate designs.
6. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
SYMM
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:15X
PKG
1
34
5
2
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
SOLDER MASK
DEFINED
EXPOSED METAL
METAL
SOLDER MASK
OPENING
NON SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
EXPOSED METAL
www.ti.com
EXAMPLE STENCIL DESIGN
(2.6)
(1.9)
2X(0.95)
5X (1.1)
5X (0.6)
(R0.05) TYP
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/E 09/2019
NOTES: (continued)
7. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
8. Board assembly site may have different recommendations for stencil design.
SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE:15X
SYMM
PKG
1
34
5
2
IMPORTANT NOTICE AND DISCLAIMER
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