VFB

EN

PGOOD

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

GND

PowerPad

TM

18

19

20

21

22

VBST

TRIP

MODE

ROVP

LL

LL

LL

LL

LL

LL

RF

VDD

VREG

VIN

VIN

VIN

VIN

VIN

VIN

TPS53318, TPS53319

www.ti.com

SLUSAY8B – JUNE 2012 – REVISED MAY 2013

DEVICE INFORMATION

DQP PACKAGE

22 PINS

(TOP VIEW)

PIN FUNCTIONS

PIN

DESCRIPTION

NAME

NO.

EN

2

I

Enable pin.Typical turn-on threshold voltage is 1.3 V. Typical turn-off threshold voltage is 1.0 V.

GND

G

Ground and thermal pad of the device. Use proper number of vias to connect to ground plane.

6

7

8

LL

B

Output of converted power. Connect this pin to the output Inductor.

9

10

11

Soft-start and mode selection. Connect a resistor to select soft-start time using Table 1. The soft-start time

MODE

20

I

is detected and stored into internal register during start-up.

Open drain power good flag. Provides 1-ms start-up delay after VFB falls in specified limits. When VFB

PGOOD

3

O

goes out of the specified limits PGOOD goes low after a 2-µs delay

ROVP

5

I

Internally pulled down to GND with 1.5-M

Ω resistor. Float this pin or connect to GND if redundant OVP is

not needed.

Switching frequency selection. Connect a resistor to GND or VREG to select switching frequency using

RF

22

I

Table 2. The switching frequency is detected and stored during the startup.

and set the OCL trip voltage as follows.

TRIP

21

I

Supply input for high-side FET gate driver (boost terminal). Connect capacitor from this pin to LL node.

VBST

4

P

Internally connected to VREG via bootstrap MOSFET switch.

VDD

19

P

Controller power supply input. VDD input voltage range is from 4.5 V to 25 V.

VFB

1

I

12

13

14

VIN

P

Conversion power input.The conversion input voltage range is from 1.5 V to 22 V.

15

16

17

(1)

I=Input, O=Output, B=Bidirectional, P=Supply, G=Ground

Copyright © 2012–2013, Texas Instruments Incorporated

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Product Folder Links: TPS53318 TPS53319