TPS51363

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SLUSBB5A – FEBRUARY 2013 – REVISED JUNE 2013

PIN FUNCTIONS

NAME

NO.

I/O/P

DESCRIPTION

Power supply for internal high side MOSFET. Connect a 0.1-µF bootstrap capacitor between this pin and

BST

5

I

SW pin.

EN

28

I

Enable signal, 1.05-V logic compatible.

GND

19

—

General device ground.

GSNS

23

O

GND sense input. Connect GSNS to general/system ground or GND sensing point at the output return.

MODE

3

I

Frequency (400 kHz or 800 kHz) programmable input (see Table 3).

NC

4

—

Not connected.

NU

2, 27

—

Not used for external applications.

10

11

PGND

12

—

Power ground. Connect to the system ground.

13

14

PGOOD

1

O

PGOOD output. Connect a pull-up resistor with a value of 100 k

Ω to this pin.

Power

29

—

Connect to system ground by multiple vias.

PAD

REFIN

25

I

Target output voltage input pin. 0.6 V to 2 V, 1.05 V/1.2 V built-in (GND and Open) (see Table 2).

REFIN2

24

I

Tie to GND or float. This input is used to determine the fixed voltage setpoint (see Table 2).

SLEW

21

O

Connect a capacitor between this pin and GND for soft start and integrator functions.

6

7

SW

O

Switching node output. Connect external inductor.

8

9

TRIP

20

I

OCL programmable input (see Table 4).

V5

18

I

5-V power supply for analog circuits and gate driver.

15

I

VIN

16

I

Power supply input pin. Apply 3-V to 22-V of supply voltage.

17

I

VREF

26

O

2-V reference output. Connect A 0.22-µF ceramic capacitor between this pin and the GNDS pin.

VSNS

22

I

Output voltage sense input.

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