100

95

90

85

80

75

70

65

60

55

50

0

500

1000

1500

2000

2500

3000

Load Current - mA

Vin = 5 V, Vout = 1.2 V

Vin = 3.3 V, Vout = 1.2 V

Vin = 5 V, Vout = 1.8 V

Vin = 3.3 V, Vout = 1.8 V

Vin = 5 V, Vout = 3.3 V

PH

VIN

BOOT

VSENSE

COMP

TPS5432

EN

SS

INPUT

3-6 V

GND

Cin

10 F

10 V

m

Rc

4.99 kW

Cc

3.3 nF

Css

0.01 F

m

2

7

6

8

1

C

BOOT

0.1 F

10 V

m

L

3.3 H

O

m

C

22 Fx2

O

m

1.2 V@3 A

R1

10 kW

R2

20 kW

Cff

390 pF

3

5

4

TPS5432

www.ti.com

SLVSB89 – MARCH 2012

2.95V to 6V Input, 3A Output, 700kHz Synchronous Step Down Converter

Check for Samples: TPS5432

1

FEATURES

DESCRIPTION

The TPS5432 is a 6V, 3A, low Iq, current mode,

2

•

Two 70m

Ω (typical) MOSFETs for 3A

synchronous

monolithic

buck

converter

with

Continuous Output Current

integrated MOSFETs. The TPS5432 enables small

•

Current Mode Control With External

designs by integrating the MOSFETs, implementing

Compensation

current mode control to reduce external component

count, reducing inductor size by 700kHz switching

•

700kHz Switching Frequency

frequency. SOIC-8 package with exposed thermal

•

360µA no Load Quiescent Operating Current

pad provides both thermally enhanced solution and

(no switching)

easy to use.

•

0.808V Internal Voltage Reference

The TPS5432 provides accurate regulation for a

•

±2.0% Reference Accuracy at 25°C

variety of loads with an accurate 3.0% voltage

•

±3.0% Reference Accuracy Over Temperature

reference over temperature.

Range –20°C~125°C

Efficiency is maximized through the integrated 70m

Ω

•

Stable Operation With Ceramic Output

MOSFETs and 360

μA typical supply current. Using

Capacitor

the enable pin, shutdown supply current is reduced to

2 µA by entering a shutdown mode.

•

Adjustable Slow Start

•

Cycle by Cycle Current Limit, and Frequency

The output voltage startup ramp is controlled by the

Fold Back Protection

slow start pin. A ceramic capacitor at this pin can

easily adjust the slow start time.

•

Thermally Enhanced 8-Pin SOIC (DDA)

Package

Frequency fold back and thermal shutdown protects

the device during an over-current condition.

APPLICATIONS

•

Consumer Applications such as DTV, Set Top

Boxes, LCD displays, CPE

•

Low-Voltage Point-of-Load Regulations for

SoC, CPU, DSP

SIMPLIFIED SCHEMATIC

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.