PGND

1

16

SW

2

VBAT

3

Vout

4

5

6

7

8

9

10

11

12

15

14

13

IFB 3

GND

DCTRL

IFB 4

TPS61181A

TPS61181A

www.ti.com

SLVSAN6A

– FEBRUARY 2011 – REVISED MARCH 2011

PINOUT

PIN ASSIGNMENTS

PIN

I/O

DESCRIPTION

NO.

NAME

1

PGND

I

Power ground of the IC. Internally, it connects to the source of the PWM switch.

2

SW

I

This pin connects to the drain of the internal PWM switch, external Schottky diode and inductor.

3

I

This pin is connected to the battery supply. It provides the pull-up voltage for the Fault pin and battery

voltage signal. This is also the input to the internal LDO.

4

O

This pin monitors the output of the boost regulator. Connect this pin to the anode of the WLED strings.

5

ISET

I

The resistor on this pin programs the WLED output current.

6

Cin

I

Supply voltage of the IC. It is the output of the internal LDO. Connect 0.1

μF bypass capacitor to this pin.

7, 8, 9

IFB1-IFB3

I

Current sink regulation inputs. They are connected to the cathode of WLEDs. The PWM loop regulates

12, 13, 14

IFB4-IFB6

10

GND

I

Signal ground of the IC.

11

DCTRL

I

Dimming control logic input. The dimming frequency range is 100 Hz to 1 kHz.

15

EN

I

The enable pin to the IC. A logic high signal turns on the internal LDO and enables the IC. Therefore, do

not connect the EN pin to the Cin pin.

16

Fault

I

Gate driver output for an external PFET used for fault protection. It can also be used as signal output for

system fault report.

Copyright

© 2011, Texas Instruments Incorporated

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Product Folder Link(s): TPS61181A