Boot

UVLO

Boot

Charge

R

Q

S

Shutdown

Logic

Thermal

Shutdown

Gate

Drive

Logic

Frequency

Shift

Oscillator

Slope

Compensation

Minimum Clamp

Voltage

Reference

Maximum

Clamp

Σ

VSENSE

Shutdown

165°C

PWM

Comparator

gm

0.8V

9A/V

Current

Sense

PWM

Latch

2.1V

GND

LX

BOOT

VIN

VSENSE

ROSC

COMP

Discharge

Logic

SS

Shutdown

2µA

TPS5403

SS

ROSC

BOOT

VIN

COMP

LX

3

4

1

2

Cin

Cboot

GND

VSENSE

6

5

8

7

Vout

Cout

Lo

Cc

Rc

Rosc

D

Vin

Css

TPS5403

SLVSBK5 – SEPTEMBER 2012

www.ti.com

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

TYPICAL APPLICATION

FUNCTIONAL BLOCK DIAGRAM

2

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Product Folder Links: TPS5403