TPS5403 datasheet(3/18 Pages) TI

Part #	TPS5403

Description	4.5-V TO 28-V INPUT VOLTAGE, 3.3-V FIXED OUTPUT, 1.7-A OUTPUT CURRENT, NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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BOOT

1

2

3

4

5

6

7

8

VIN

ROSC

GND

COMP

VSENSE

SS

LX

D PACKAGE

(TOP VIEW)

GROUND

VOUT

VIN

BOOT

1

2

3

4

5

6

7

8

VIN

SS

GND

COMP

VSENSE

ROSC

LX

TPS5403

www.ti.com

SLVSBK5 – SEPTEMBER 2012

PCB LAYOUT

ORDERING INFORMATION(1)

TA

PACKAGE(2)

ORDERABLE PART NUMBER

TOP-SIDE MARKING

–40°C to 85°C

8-pin SOIC (D)

TPS5403DR

TPS5403

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

PIN OUT

TERMINAL FUNCTIONS

NAME

NO.

DESCRIPTION

BOOT

1

A 0.1-µF bootstrap capacitor is required between BOOT and LX.

VIN

2

Input supply voltage, 4.5 V to 28 V

Switching frequency program pin. Connect a resistor to this pin to set the switching frequency. Connect the

ROSC

3

pin to ground for a default 70-kHz switching frequency. Leave the pin open for 120-kHz switching

frequency.

SS

4

Soft start pin. An external capacitor connected to this pin sets the output rise time.

VSENSE

5

Output voltage feedback pin

Error amplifier output and input to the PWM comparator. Connect frequency compensation components to

COMP

6

this pin.

GND

7

Ground

LX

8

Switching node to external inductor

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