PIN ASSIGNMENT (TOP VIEW)

VBST

SS

EN

VO

VFB

GND

CER

DRVH

SW

DRVL

PGND

TRIP

VIN

VREG5

V5FILT

FSEL

16

1

2

3

4

5

6

7

8

10

11

12

13

14

15

9

TPS53114

PIN FUNCTIONS

PIN

I/O

DESCRIPTION

NAME

NO.

Supply input for high-side NFET driver (Boost Terminal). Connect capacitor from this pin to SW terminal. An

VBST

16

I

internal PN diode is connected between VREG5 and VBST. User can add external schottky diode if forward

drop is critical to drive the NFET.

EN

7

I

High level enable pin.

SS

3

O

Connect Capacitor from SS pin to GND.

VO

1

I

Connect to output of converter. This terminal is used for On-Time Adjustment and Output Discharge.

VFB

2

I

Converter feedback input. Connect with feedback resistor divider.

GND

4

I

Signal ground pin.

High-side NFET driver output. SW referenced floating driver. The gate drive voltage is defined by the voltage

DRVH

15

O

across VBST to SW node capacitor.

SW

14

I/O

Switch node connections for high-side driver. Also serves as input to current comparator.

DRVL

13

O

Synchronous NFET driver output. PGND referenced driver. The gate drive voltage is defined by VREG5

voltage.

Ground return for DRVL. Also serves as input of current comparator. Connect PGND and GND together near

PGND

12

I/O

the IC.

Over current trip point set input. Connect resistor from this pin to GND to set threshold for synchronous FET

TRIP

11

I

comparator.

VIN

9

I

Supply Input for 5V linear regulator.

5V supply input for the entire control circuit except the NFET driver. Connect Capacitor (typical 1uF) from GND

V5FILT

8

I

to V5FILT. V5FILT is connected to VREG5 via internal resistor.

VREG5

10

O

5V power supply output. VREG5 is connected to V5FILT via internal resistor.

Connect to GND for ceramic output capacitors. Connect to V5FILT for polymer electrolyte output capacitors

CER

5

I

(SP-CAP, POS-CAP, PXE).

Switching frequency selection pin. Connect to GND for low switching frequency or connect to V5FILT for high

FSEL

6

I

switching frequency.

Copyright © 2009, Texas Instruments Incorporated

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Product Folder Link(s): TPS53114