LM2852YMXA-1.2/NOPB - Texas Instruments

ILOAD (A)

0.1 1.0 10

EFFICIENCY (%)

PVIN = 3.3V

PVIN

AVIN

SS SGND PGND

SNS

LM2852Y

CSS = 2.7 nF

CIN = 22 PF

VIN = 3.3V

VOUT = 2.5V

ILOAD = 0A to 2A

CO = 100 PF

LO = 10 PH

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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.

LM2852

SNVS325E –JANUARY 2005–REVISED JANUARY 2016

LM2852 2A 500/1500 kHz Synchronous Buck Regulator

1 Features

1• Input Voltage Range of 2.85 V to 5.5 V

• Factory EEPROM Set Output Voltages from 0.8 V

to 3.3 V in 100-mV Increments

• Maximum Load Current of 2 A

• Voltage Mode Control

• Internal Type-Three Compensation

• Switching Frequency of 500 kHz or 1.5 MHz

• Low Standby Current of 10 µA

• Internal 60-mΩMOSFET Switches

• Standard Voltage Options 0.8/1/1.2/1.5/1.8/2.5/3.3

2 Applications

• Low Voltage Point of Load Regulation

• Local Solution for FPGA/DSP/ASIC Core Power

• Broadband Networking and Communications

Infrastructure

• Portable Computing

space

3 Description

The LM2852 synchronous buck regulator is a high

frequency step-down switching voltage regulator

capable of driving up to a 2A load with excellent line

and load regulation. The LM2852 can accept an input

voltage between 2.85 V and

5.5 V and deliver an output voltage that is factory

programmable from 0.8 V to 3.3 V in 100-mV

increments. The LM2852 is available with a choice of

two switching frequencies –500 kHz (LM2852Y) or

1.5 MHz (LM2852X). It also features internal, type-

three compensation to deliver a low component count

solution. The exposed-pad HTSSOP-14 package

enhances the thermal performance of the LM2852.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

LM2852 HTSSOP (14) 5.00 mm × 4.40 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit Figure 1. Efficiency vs ILOAD

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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......................................................... 4

6.1 Absolute Maximum Ratings ...................................... 4

6.2 ESD Ratings.............................................................. 4

6.3 Recommended Operating Conditions....................... 4

6.4 Thermal Information.................................................. 4

6.5 Electrical Characteristics........................................... 5

6.6 LM2852Y Typical Characteristics (500 kHz)............. 7

6.7 LM2852X Typical Characteristics (1500 kHz)........... 8

6.8 LM2852 Typical Characteristics (Both Y and X

Versions).................................................................... 9

7 Detailed Description............................................ 10

7.1 Overview................................................................. 10

7.2 Functional Block Diagram....................................... 10

7.3 Feature Description................................................. 11

7.4 Device Functional Modes........................................ 11

8 Application and Implementation ........................ 12

8.1 Application Information............................................ 12

8.2 Typical Application ................................................. 12

9 Power Supply Recommendations...................... 18

10 Layout................................................................... 18

10.1 Layout Guidelines ................................................. 18

10.2 Layout Example .................................................... 18

11 Device and Documentation Support................. 19

11.1 Device Support...................................................... 19

11.2 Community Resources.......................................... 19

11.3 Trademarks........................................................... 19

11.4 Electrostatic Discharge Caution............................ 19

11.5 Glossary................................................................ 19

12 Mechanical, Packaging, and Orderable

Information........................................................... 19

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision D (April 2013) to Revision E 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

SGND

PVIN

SNS

PGND

AVIN

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5 Pin Configuration and Functions

PWP Package

14-Pin HTSSOP

Top View

Pin Functions

PIN I/O DESCRIPTION

NAME NO.

AVIN 1 I Chip bias input pin. This provides power to the logic of the chip. Connect to the input voltage

or a separate rail.

EN 2 I Enable. Connect this pin to ground to disable the chip; connect to AVIN or leave floating to

enable the chip; enable is internally pulled up.

Exposed Connect to ground.

NC 5, 12, 13 No connect. These pins must be tied to ground or left floating in the application.

PGND 10, 11 G Power ground. Connect this to an internal ground plane or other large ground plane.

PVIN 6, 7 I Input supply pin. PVIN is connected to the input voltage. This rail connects to the source of

the internal power PFET.

SGND 3 G Signal ground.

SNS 14 O Output voltage sense pin. Connect this pin to the output voltage as close to the load as

possible.

SS 4 I Soft-start pin. Connect this pin to a small capacitor to control startup. The soft-start

capacitance range is restricted to values 1 nF to 50 nF.

SW 8, 9 O Switch pin. Connect to the output inductor.

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(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.

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)(2)

MIN MAX UNIT

PVIN, AVIN, EN, SNS 6.5 V

Power dissipation Internally limited

14-Pin exposed pad HTSSOP package Infrared (15 sec) 220 °C

Vapor phase (60 sec) 215 °C

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

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT

PVIN to GND 1.5 5.5 V

AVIN to GND 2.85 5.5 V

Junction temperature −40 125 °C

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

6.4 Thermal Information

THERMAL METRIC(1) LM2852

UNITPWP (HTTSOP)

14 PINS

RθJA Junction-to-ambient thermal resistance 39.2 °C/W

RθJC(top) Junction-to-case (top) thermal resistance 24.1 °C/W

RθJB Junction-to-board thermal resistance 20.1 °C/W

ψJT Junction-to-top characterization parameter 0.6 °C/W

ψJB Junction-to-board characterization parameter 19.8 °C/W

RθJC(bot) Junction-to-case (bottom) thermal resistance 1.7 °C/W

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(1) VOUT measured in a non-switching, closed-loop configuration at the SNS pin.

6.5 Electrical Characteristics

AVIN = PVIN = 5 V unless otherwise indicated under the Test Conditions column. Limits apply over the junction temperature

(TJ) range of –40°C to 125°C (unless otherwise noted). Minimum and Maximum limits are ensured 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.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SYSTEM PARAMETERS

VOUT Voltage

tolerance(1)

VOUT = 0.8-V option 0.782 0.818

VOUT = 1-V option 0.9775 1.0225

VOUT = 1.2-V option 1.173 1.227

VOUT = 1.5-V option 1.4663 1.5337

VOUT = 1.8-V option 1.7595 1.8405

VOUT = 2.5-V option 2.4437 2.5563

VOUT = 3-V option 2.9325 3.0675

VOUT = 3.3-V option 3.2257 3.3743

ΔVOUT/ΔAVIN Line regulation(1)

VOUT = 0.8 V, 1 V, 1.2 V, 1.5 V,

1.8 V or 2.5 V,

2.85 V ≤AVIN ≤5.5 V

TJ= –40°C to

125°C 0.6%

TJ= 25°C 0.2%

VOUT = 3.3 V,

3.5 V ≤AVIN ≤5.5 V

TJ= –40°C to

125°C 0.6%

TJ= 25°C 0.2%

ΔVOUT/ΔIOLoad regulation Normal operation TJ= 25°C 8 mV/A

VON UVLO threshold (AVIN)

Rising TJ= –40°C to

125°C 2.85 V

TJ= 25°C 2.47

Falling hysteresis TJ= –40°C to

125°C 85 210 mV

TJ= 25°C 150

rDSON-P PFET ON resistance Isw = 2 A TJ= –40°C to

125°C 140 mΩ

TJ= 25°C 75

rDSON-N NFET ON resistance Isw = 2 A TJ= –40°C to

125°C 120 mΩ

TJ= 25°C 55

RSS Soft-start resistance TJ= 25°C 400 kΩ

ICL Peak current limit

threshold

LM2852X TJ= –40°C to

125°C 2.75 4.95

TJ= 25°C 4

LM2852Y TJ= –40°C to

125°C 2.25 3.65

TJ= 25°C 3

IQOperating current Non-switching TJ= –40°C to

125°C 2mA

TJ= 25°C 0.85

ISD Shutdown quiescent

current EN = 0 V TJ= –40°C to

125°C 25 µA

TJ= 25°C 10

RSNS Sense pin resistance TJ= 25°C 400 kΩ

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Electrical Characteristics (continued)

AVIN = PVIN = 5 V unless otherwise indicated under the Test Conditions column. Limits apply over the junction temperature

(TJ) range of –40°C to 125°C (unless otherwise noted). Minimum and Maximum limits are ensured 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.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

(2) The enable pin is internally pulled up, so the LM2852 is automatically enabled unless an external enable voltage is applied.

PWM

fosc

LM2852X 1500-kHz option. TJ= –40°C to

125°C 1050 1825 kHz

TJ= 25°C 1500

LM2852Y 500-kHz option. TJ= –40°C to

125°C 325 625 kHz

TJ= 25°C 500

Drange Duty cycle 0% 100%

ENABLE CONTROL(2)

VIH EN pin minimum high

input 75 % of

AVIN

VIL EN pin maximum low

input 25 % of

AVIN

IEN EN pin pullup current EN = 0 V TJ= 25°C 1.2 µA

THERMAL CONTROLS

TSD TJfor thermal shutdown TJ= 25°C 165 °C

TSD-HYS Hysteresis for thermal

shutdown TJ= 25°C 10 °C

0.1 1.0 10

EFFICIENCY (%)

ILOAD (A)

PVIN = 5.0V

-50 -25 0 25 50 75 100 125 150

TEMPERATURE (oC)

480

490

500

510

520

530

540

550

560

FREQUENCY (kHz)

VIN = 3.3V

VIN = 5V

0.1 1.0 10

EFFICIENCY (%)

ILOAD (A)

PVIN = 3.3V

PVIN = 5.0V

0.1 1.0 10

PVIN = 3.3V

ILOAD (A)

EFFICIENCY (%)

PVIN = 5.0V

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6.6 LM2852Y Typical Characteristics (500 kHz)

Figure 2. Efficiency vs ILoad VOUT = 1.5 V Figure 3. Efficiency vs ILoad VOUT = 2.5 V

Figure 4. Efficiency vs ILoad VOUT = 3.3 V Figure 5. Frequency vs Temperature

0.1 1.0 10

EFFICIENCY (%)

ILOAD (A)

PVIN = 5.0V

-50 -25 0 25 50 75 80 85 90

TEMPERATURE (oC)

FREQUENCY (kHz)

PVIN = 3.3V

PVIN = 5.0V

1200

1250

1300

1350

1400

1450

1500

1550

1600

0.1 1.0 10

EFFICIENCY (%)

ILOAD (A)

PVIN = 3.3V

PVIN = 5.0V

ILOAD (A)

0.1 1.0 10

100

EFFICIENCY (%)

PVIN = 3.3V

PVIN = 5.0V

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6.7 LM2852X Typical Characteristics (1500 kHz)

Figure 6. Efficiency vs ILoad VOUT = 1.5 V Figure 7. Efficiency vs ILoad VOUT = 2.5 V

Figure 8. Efficiency vs ILoad VOUT = 3.3 V Figure 9. Frequency vs Temperature

-50 -25 0 25 50 75 100 125 150

TEMPERATURE (oC)

100

NFET RDSON (m:)

PVIN = 3.3V

PVIN = 5.0V

-50 -25 0 25 50 75 100 125 150

TEMPERATURE (oC)

100

110

120

130

PFET RDSON (m:)

PVIN = 3.3V

PVIN = 5.0V

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6.8 LM2852 Typical Characteristics (Both Y and X Versions)

Figure 10. NMOS Switch RDSON vs Temperature Figure 11. PMOS Switch RDSON vs Temperature

Ramp and Clock

Generator

AVIN

PVIN

Gate

Drive SW

PGND

SNS

Error

Amp

PWM

Comp

OscillatorReference

UVLO DAC

Zc2

400 k:

200 k:200 k:

20 pF

SGND

Zc1

Current Limit

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7 Detailed Description

7.1 Overview

The LM2852 is a DC-DC synchronous buck regulator. Integration of the PWM controller, power switches and

compensation network greatly reduces the component count required to implement a switching power supply.

7.2 Functional Block Diagram

CSS = 3.3 nF CO = 100 PF

PVIN

AVIN

SS SGND PGND

SNS

LM2852Y

VOUT = 1.5V

ILOAD = 0A to 2A

LO = 10 PH

CIN = 47 PF1 PF

PVIN = 3.3VAVIN = 5V

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7.3 Feature Description

7.3.1 Split-Rail Operation

The LM2852 can be powered using two separate voltages for AVIN and PVIN. AVIN is the supply for the control

logic; PVIN is the supply for the power FETs. The output filter components need to be chosen based on the

value of PVIN. For PVIN levels lower than 3.3 V, use output filter component values recommended for 3.3 V.

PVIN must always be equal to or less than AVIN.

Figure 12. Split-Rail Operation

7.3.2 Switch Node Protection

The LM2852 includes protection circuitry that monitors the voltage on the switch pin. Under certain conditions,

switching is disabled in order to protect the switching devices. One result of the protection circuitry may be

observed when power to the LM2852 is applied with no or light load on the output. The output regulates to the

rated voltage, but no switching may be observed. As soon as the output is loaded, the LM2852 begins normal

switching operation.

7.4 Device Functional Modes

The LM2852 Enable pin is internally pulled up so that the part is enabled anytime the input voltage exceeds the

UVLO threshold. A pulldown resistor can be used to set the enable input to low.

IRMS = ILOAD D(1-D)

CSS

PVIN

AVIN

SS SGND PGND

SNS

LM2852

VOUT = 1.8V

ILOAD = 0A to 2A

CIN

VIN = 3.3V

CINX CO

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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 must

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM2852 is a DC-DC synchronous buck regulator capable of driving a maximum load current of 2A, with an

input range of 2.85 V to 5.5 V and a variable output range of 0.8 V to 3.3 V. Figure 13 is a schematic example of

a typical application.

8.2 Typical Application

Figure 13. LM2852 Example Circuit Schematic

8.2.1 Design Requirements

A typical application requires only four components: an input capacitor, a soft-start capacitor, an output filter

capacitor and an output filter inductor. To properly size the components for the application, the designer needs

the following parameters: input voltage range, output voltage, output current range, and required switching

frequency. These four main parameters affect the choices of component available to achieve a proper system

behavior.

8.2.2 Detailed Design Procedure

8.2.2.1 Input Capacitor (CIN)

Fast switching of large currents in the buck converter places a heavy demand on the voltage source supplying

PVIN. The input capacitor, CIN, supplies extra charge when the switcher needs to draw a burst of current from

the supply. The RMS current rating and the voltage rating of the CIN capacitor are therefore important in the

selection of CIN. The RMS current specification can be approximated by Equation 1:

where

• D is the duty cycle, VOUT/VIN. CIN also provides filtering of the supply. (1)

Trace resistance and inductance degrade the benefits of the input capacitor, so CIN must be placed very close to

PVIN in the layout. A 22-µF or 47-µF ceramic capacitor is typically sufficient for CIN. In parallel with the large

input capacitance a smaller capacitor may be added such as a 1-µF ceramic for higher frequency filtering.

't = C I

'V= 100 PF3A

3V = 100 Ps

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Typical Application (continued)

8.2.2.2 Soft-Start Capacitor (CSS)

The DAC that sets the reference voltage of the error amp sources a current through a resistor to set the

reference voltage. The reference voltage is one half of the output voltage of the switcher due to the 200 kΩ

divider connected to the SNS pin. Upon start-up, the output voltage of the switcher tracks the reference voltage

with a two to one ratio as the DAC current charges the capacitance connected to the reference voltage node.

Internal capacitance of 20 pF is permanently attached to the reference voltage node which is also connected to

the soft-start pin, SS. Adding a soft-start capacitor externally increases the time it takes for the output voltage to

reach its final level.

The charging time required for the reference voltage can be estimated using the RC time constant of the DAC

resistor and the capacitance connected to the SS pin. Three RC time constant periods are needed for the

reference voltage to reach 95% of its final value. The actual start-up time varies with differences in the DAC

resistance and higher-order effects.

If little or no soft-start capacitance is connected, then the start-up time may be determined by the time required

for the current limit current to charge the output filter capacitance. The capacitor charging equation I = C ΔV/Δt

can be used to estimate the start-up time in this case. For example, a part with a 3-V output, a 100-µF output

capacitance and a 3-A current limit threshold would require a time of 100 µs, seen in Equation 2:

(2)

Since it is undesirable for the power supply to start up in current limit, a soft-start capacitor must be chosen to

force the LM2852 to start up in a more controlled fashion based on the charging of the soft-start capacitance. In

this example, suppose a 3 ms start time is desired. Three time constants are required for charging the soft-start

capacitor to 95% of the final reference voltage. So in this case RC = 1 ms. The DAC resistor, R, is 400 kΩso C

can be calculated to be 2.5 nF. A 2.7-nF ceramic capacitor can be chosen to yield approximately a 3 ms start-up

time.

8.2.2.3 Soft-Start Capacitor (CSS) and Fault Conditions

Various fault conditions such as short circuit and UVLO of the LM2852 activate internal circuitry designed to

control the voltage on the soft-start capacitor. For example, during a short circuit current limit event, the output

voltage typically falls to a low voltage. During this time, the soft-start voltage is forced to track the output so that

once the short is removed, the LM2852 can restart gracefully from whatever voltage the output reached during

the short circuit event. The range of soft-start capacitors is therefore restricted to values 1 nF to 50 nF.

8.2.2.4 Compensation

The LM2852 provides a highly integrated solution to power supply design. The compensation of the LM2852,

which is type-three, is included on-chip. The benefit to integrated compensation is straightforward, simple power

supply design. Since the output filter capacitor and inductor values impact the compensation of the control loop,

the range of L, C and CESR values is restricted in order to ensure stability.

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Typical Application (continued)

8.2.2.5 Output Filter Values

Table 1 details the recommended inductor and capacitor ranges for the LM2852 that are suggested for various

typical output voltages. Values slightly different than those recommended may be used, however the phase

margin of the power supply may be degraded.

Table 1. Output Filter Values

FREQUENCY

OPTION VOUT (V) PVIN (V) L (µH) C (µF) CESR (mΩ)

MIN MAX MIN MAX MIN MAX

LM2852Y

(500 kHz)

0.8 3.3 10 15 100 220 70 200

0.8 5 10 15 100 120 70 200

1 3.3 10 15 100 180 70 200

1 5 10 15 100 180 70 200

1.2 3.3 10 15 100 180 70 200

1.2 5 15 22 100 120 70 200

1.5 3.3 10 15 100 120 70 200

1.5 5 22 22 100 120 70 200

1.8 3.3 10 15 100 120 100 200

1.8 5 22 33 100 120 100 200

2.5 3.3 6.8 10 68 120 95 275

2.5 5 15 22 68 120 95 275

3.3 5 15 22 68 100 100 275

LM2852X

(1500 kHz)

0.8 3.3

1 10 The 1500-kHz version is

designed for ceramic output

capacitors, which typically have

very low ESR (< 10 mΩ.)

0.8 5

1 3.3

1 5

1.2 3.3

1.2 5

1.5 3.3

1.5 5

1.8 3.3

1.8 5

2.5 3.3

2.5 5

3.3 5

'IL = 500 kHz x 15 PH

1.2V x

5V (5V - 1.2V) = 121.6 mA

'IL = f x L

D x (VIN - VOUT)

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8.2.2.6 Choosing an Inductance Value

The current ripple present in the output filter inductor is determined by the input voltage, output voltage, switching

frequency and inductance according to Equation 3:

where

•ΔILis the peak-to-peak current ripple.

• D is the duty cycle VOUT/VIN.

• VIN is the input voltage applied to the PVIN pin.

• VOUT is the output voltage of the switcher.

• f is the switching frequency.

• L is the inductance of the output filter inductor. (3)

Knowing the current ripple is important for inductor selection since the peak current through the inductor is the

load current plus one half the ripple current. Care must be taken to ensure the peak inductor current does not

reach a level high enough to trip the current limit circuitry of the LM2852.

As an example, consider a 5-V to 1.2-V conversion and a 500-kHz switching frequency. According to Table 1, a

15-µH inductor may be used. Calculating the expected peak-to-peak ripple, as seen in Equation 4.

(4)

The maximum inductor current for a 2-A load would therefore be 2 A plus 60.8 mA, 2.0608 A. As shown in the

ripple equation, the current ripple is inversely proportional to inductance.

8.2.2.7 Output Filter Inductors

Once the inductance value is chosen, the key parameter for selecting the output filter inductor is its saturation

current (Isat) specification. Typically Isat is given by the manufacturer as the current at which the inductance of the

coil falls to a certain percentage of the nominal inductance. The Isat of an inductor used in an application must be

greater than the maximum expected inductor current to avoid saturation. Table 2 lists the inductors that may be

suitable in LM2852 applications.

Table 2. LM2852 Output Filter Inductors

INDUCTANCE (µH) PART NUMBER VENDOR

1 DO1608C-102 Coilcraft

1 DO1813P-102HC Coilcraft

6.8 DO3316P-682 Coilcraft

7 MSS1038-702NBC Coilcraft

10 DO3316P-103 Coilcraft

10 MSS1038-103NBC Coilcraft

12 MSS1038-123NBC Coilcraft

15 D03316P-153 Coilcraft

15 MSS1038-153NBC Coilcraft

18 MSS1038-183NBC Coilcraft

22 DO3316P-223 Coilcraft

22 MSS1038-223NBC Coilcraft

22 DO3340P-223 Coilcraft

27 MSS1038-273NBC Coilcraft

33 MSS1038-333NBC Coilcraft

33 DO3340P-333 Coilcraft

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8.2.2.8 Output Filter Capacitors

The capacitors that may be used in the output filter with the LM2852 are limited in value and ESR range

according to Table 1.Table 3 lists some examples of capacitors that can typically be used in an LM2852

application.

Table 3. LM2852 Output Filter Capacitors

CAPACITANCE (µF) PART NUMBER CHEMISTRY VENDOR

10 GRM31MR61A106KE19 Ceramic Murata

10 GRM32DR61E106K Ceramic Murata

68 595D686X_010C2T Tantalum Vishay - Sprague

68 595D686X_016D2T Tantalum Vishay - Sprague

100 595D107X_6R3C2T Tantalum Vishay - Sprague

100 595D107X_016D2T Tantalum Vishay - Sprague

100 NOSC107M004R0150 Niobium Oxide AVX

100 NOSD107M006R0100 Niobium Oxide AVX

120 595D127X_004C2T Tantalum Vishay - Sprague

120 595D127X_010D2T Tantalum Vishay - Sprague

150 595D157X_004C2T Tantalum Vishay - Sprague

150 595D157X_016D2T Tantalum Vishay - Sprague

150 NOSC157M004R0150 Niobium Oxide AVX

150 NOSD157M006R0100 Niobium Oxide AVX

220 595D227X_004D2T Tantalum Vishay - Sprague

220 NOSD227M004R0100 Niobium Oxide AVX

220 NOSE227M006R0100 Niobium Oxide AVX

Table 4. Bill of Materials for 500kHz (LM2852Y) 3.3 VIN to 1.8 VOUT Conversion

ID PART NUMBER TYPE SIZE PARAMETERS QTY VENDOR

U1LM2852YMXA-1.8 2-A buck HTSSOP-14 1 TI

LODO3316P-153 Inductor 15 µH 1 Coilcraft

CO* 595D107X_6R3C2T Capacitor Case Code “C” 100 µF ±20% 1 Vishay-Sprague

CIN GRM32ER60J476ME20B Capacitor 1210 47 µF/X5R/6.3V 1 Murata

CINX GRM21BR71C105KA01B Capacitor 0805 1 µF/X7R/16V 1 Murata

CSS VJ0805Y272KXXA Capacitor 0805 2.7 nF ±10% 1 Vishay-Vitramon

RfCRCW060310R0F Resistor 0603 10 Ω±10% 1 Vishay-Dale

CfGRM21BR71C105KA01B Capacitor 0805 1 µF/X7R/16V 1 Murata

Table 5. Bill of Materials for 1500-kHz (LM2852X) 3.3-V to 1.8-V Conversion

ID PART NUMBER TYPE SIZE PARAMETERS QTY VENDOR

U1LM2852XMXA-1.8 2-A buck HTSSOP-14 1 TI

L0DO1813P-102HC Inductor 1 µH 1 Coilcraft

C0GRM32DR61E106K Capacitor 1210 10 µF/X5R/25V 1 Murata

CIN GRM32ER60J476ME20B Capacitor 1210 47 µF/X5R/6.3V 1 Murata

CINX GRM21BR71C105KA01B Capacitor 0805 1 µF/X7R/16V 1 Murata

CSS VJ0805Y272KXXA Capacitor 0805 2.7 nF ±10% 1 Vishay-Vitramon

RfCRCW060310R0F Resistor 0603 10 Ω±10% 1 Vishay-Dale

CfGRM21BR71C105KA01B Capacitor 0805 1 µF/X7R/16V 1 Murata

2.5 3 3.5 4 4.5 5 5.5

VIN (V)

IQ SHUTDOWN (PA)

25oC

85oC

125oC

-40oC

2.5 3 3.5 4 4.5 5 5.5

VIN (V)

500

600

700

800

900

1000

1100

IQ (PA)

25oC

85oC

125oC

-40oC

LM2852

www.ti.com

SNVS325E –JANUARY 2005–REVISED JANUARY 2016

Product Folder Links: LM2852

8.2.3 Application Curves

Figure 14. Shutdown Current vs VIN Figure 15. Quiescent Current (Non-Switching) vs VIN

LM2852

SNVS325E –JANUARY 2005–REVISED JANUARY 2016

www.ti.com

Product Folder Links: LM2852

9 Power Supply Recommendations

The LM2852 is designed to operate from various DC power supplies. If so, VIN input must be protected from

reversal voltage and voltage dump over 6.5 V. The impedance of the input supply rail must be low enough that

the input current transient does not cause drop below VIN UVLO level. If the input supply is connected by using

long wires, additional bulk capacitance may be required in addition to normal input capacitor.

10 Layout

10.1 Layout Guidelines

These are several guidelines to follow while designing the PCB layout for an LM2852 application.

• The input bulk capacitor, CIN, must be placed very close to the PVIN pin to keep the resistance as low as

possible between the capacitor and the pin. High-current levels are present in this connection

• All ground connections must be tied together. Use a broad ground plane, for example a completely filled back

plane, to establish the lowest resistance possible between all ground connections

• The sense pin connection must be made as close to the load as possible so that the voltage at the load is the

expected regulated value. The sense line must not run too close to nodes with high EMI (such as the switch

node) to minimize interference

• The switch node connections must be low resistance to reduce power losses. Low resistance means the

trace between the switch pin and the inductor must be wide. However, the area of the switch node must not

be too large since EMI increases with greater area. So connect the inductor to the switch pin with a short, but

wide trace. Other high current connections in the application such as PVIN and VOUT assume the same trade

off between low resistance and EMI

• Allow area under the chip to solder the entire exposed die attach pad to ground for improved thermal and

electrical performance

10.2 Layout Example

Figure 16. PCB Layout Example

LM2852

www.ti.com

SNVS325E –JANUARY 2005–REVISED JANUARY 2016

Product Folder Links: LM2852

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 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.

11.3 Trademarks

E2E is a trademark of Texas Instruments.

All other 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.

PACKAGE OPTION ADDENDUM

www.ti.com 23-Aug-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

LM2852XMXA-1.0/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

1.0

LM2852XMXA-1.2/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

1.2

LM2852XMXA-1.5/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

1.5

LM2852XMXA-1.8/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

1.8

LM2852XMXA-2.5/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

2.5

LM2852XMXA-3.0/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM 2852X

3.0

LM2852XMXA-3.3/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

3.3

LM2852XMXAX-1.2/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

1.2

LM2852XMXAX-1.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

1.5

LM2852XMXAX-1.8/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

1.8

LM2852XMXAX-2.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

2.5

LM2852XMXAX-3.3/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X

3.3

LM2852YMXA-1.0/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-1.0

LM2852YMXA-1.2/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-1.2

LM2852YMXA-1.3/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM 2852Y

1.3

LM2852YMXA-1.5/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-1.5

LM2852YMXA-1.8/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-1.8

PACKAGE OPTION ADDENDUM

www.ti.com 23-Aug-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

LM2852YMXA-2.5/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-2.5

LM2852YMXA-3.3 NRND HTSSOP PWP 14 94 TBD Call TI Call TI -40 to 125 2852Y

-3.3

LM2852YMXA-3.3/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-3.3

LM2852YMXAX-1.0/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-1.0

LM2852YMXAX-1.2/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-1.2

LM2852YMXAX-1.3/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM 2852Y

1.3

LM2852YMXAX-1.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-1.5

LM2852YMXAX-1.8/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-1.8

LM2852YMXAX-2.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-2.5

LM2852YMXAX-3.3/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y

-3.3

(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.

PACKAGE OPTION ADDENDUM

www.ti.com 23-Aug-2017

Addendum-Page 3

(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

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)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

LM2852XMXAX-1.2/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852XMXAX-1.5/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852XMXAX-1.8/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852XMXAX-2.5/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852XMXAX-3.3/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852YMXAX-1.0/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852YMXAX-1.2/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852YMXAX-1.3/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852YMXAX-1.5/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852YMXAX-1.8/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

LM2852YMXAX-2.5/NOP HTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

PACKAGE MATERIALS INFORMATION

www.ti.com 24-Aug-2017

Pack Materials-Page 1

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

LM2852YMXAX-3.3/NOP

BHTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

LM2852XMXAX-1.2/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852XMXAX-1.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852XMXAX-1.8/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852XMXAX-2.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852XMXAX-3.3/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852YMXAX-1.0/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852YMXAX-1.2/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852YMXAX-1.3/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852YMXAX-1.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852YMXAX-1.8/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852YMXAX-2.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

LM2852YMXAX-3.3/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0

PACKAGE MATERIALS INFORMATION

www.ti.com 24-Aug-2017

Pack Materials-Page 2

MECHANICAL DATA

PWP0014A

www.ti.com

MXA14A (Rev A)

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Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Texas Instruments:

LM2852XMXA-0.8 LM2852XMXA-0.8/NOPB LM2852XMXA-1.0 LM2852XMXA-1.0/NOPB LM2852XMXA-1.2

LM2852XMXA-1.2/NOPB LM2852XMXA-1.5 LM2852XMXA-1.5/NOPB LM2852XMXA-1.8 LM2852XMXA-1.8/NOPB

LM2852XMXA-2.5 LM2852XMXA-2.5/NOPB LM2852XMXA-3.0 LM2852XMXA-3.0/NOPB LM2852XMXA-3.3

LM2852XMXA-3.3/NOPB LM2852XMXAX-0.8 LM2852XMXAX-0.8/NOPB LM2852XMXAX-1.0 LM2852XMXAX-

1.0/NOPB LM2852XMXAX-1.2 LM2852XMXAX-1.2/NOPB LM2852XMXAX-1.5 LM2852XMXAX-1.5/NOPB

LM2852XMXAX-1.8 LM2852XMXAX-1.8/NOPB LM2852XMXAX-2.5 LM2852XMXAX-2.5/NOPB LM2852XMXAX-3.0

LM2852XMXAX-3.0/NOPB LM2852XMXAX-3.3 LM2852XMXAX-3.3/NOPB LM2852YMXA-0.8 LM2852YMXA-

0.8/NOPB LM2852YMXA-1.0 LM2852YMXA-1.0/NOPB LM2852YMXA-1.2 LM2852YMXA-1.2/NOPB LM2852YMXA-

1.3 LM2852YMXA-1.3/NOPB LM2852YMXA-1.5 LM2852YMXA-1.5/NOPB LM2852YMXA-1.8 LM2852YMXA-

1.8/NOPB LM2852YMXA-2.5 LM2852YMXA-2.5/NOPB LM2852YMXA-3.0 LM2852YMXA-3.0/NOPB LM2852YMXA-

3.3 LM2852YMXA-3.3/NOPB LM2852YMXAX-0.8 LM2852YMXAX-0.8/NOPB LM2852YMXAX-1.0 LM2852YMXAX-

1.0/NOPB LM2852YMXAX-1.2 LM2852YMXAX-1.2/NOPB LM2852YMXAX-1.3 LM2852YMXAX-1.3/NOPB

LM2852YMXAX-1.5 LM2852YMXAX-1.5/NOPB LM2852YMXAX-1.8 LM2852YMXAX-1.8/NOPB LM2852YMXAX-2.5

LM2852YMXAX-2.5/NOPB LM2852YMXAX-3.0 LM2852YMXAX-3.0/NOPB LM2852YMXAX-3.3 LM2852YMXAX-

3.3/NOPB