1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

VIN

RON

UDIM

VOUT

VREF

IADJ

COMP

SDIM

HG

DAP

SW

BOOT

VCC

LG

CS

GND

SDRV

TPS92641

PWP Package

(Top View)

1

2

3

4

5

6

7

14

13

12

11

10

9

8

VIN

RON

UDIM

VOUT

VREF

IADJ

COMP

HG

DAP

SW

BOOT

VCC

LG

CS

GND

TPS92640

PWP Package

(Top View)

TPS92640

TPS92641

SNVS902 – NOVEMBER 2012

www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

PIN CONFIGURATION

PIN FUNCTIONS

TPS92640

TPS92641

NAME

DESCRIPTION

1

1

VIN

Connect to input voltage. Connect 1µF bypass capacitor

2

2

RON

Connect a resistor to VIN and capacitor to GND to set switching frequency.

3

3

UDIM

Connect resistor divider from VIN to set under-voltage lockout threshold.

4

4

VOUT

Connect resistor divider from VOUT, scaled down feedback of VOUT.

5

5

VREF

Connect to top of resistor divider for IADJ. Bypass with 100nF ceramic capacitor.

6

6

IADJ

Connect resistor divider from VREF or directly to VREF to set analog dimming level. Can be used for

thermal fold-back also.

7

7

COMP

Connect ceramic capacitor to GND to set loop compensation.

8

SDIM

PWM dimming input for shunt FET dimming.

9

SDRV

Connect to gate of external parallel NFET across LED load used for shunt dimming if desired.

8

10

GND

System GND. Connect to DAP.

9

11

CS

Connect to positive terminal of sense resistor at the bottom of the LED stack.

10

12

LG

Connect to gate of low-side NFET of buck regulator.

11

13

VCC

Bypass with 2.2µF ceramic capacitor to provide bias supply for controller.

12

14

BOOT

Connect 100nF ceramic capacitor to switch node and diode to VCC to provide boosted voltage for

high-side gate drive.

13

15

SW

Connect to switch node of buck regulator.

14

16

HG

Connect to gate of high-side NFET of buck regulator.

DAP

Place 6-9 vias from pad to GND plane for thermal relief

Ordering Information

ORDER NUMBER

PACKAGE TYPE

PACKAGE DRAWING

SUPPLIED AS

TPS92640PWP

94 Units in Rail

TPS92640PWPT

14L TSSOP EXP PAD

MXA14A

250 Units on Tape and Reel

TPS92640PWPR

2500 Units on Tape and Reel

TPS92641PWP

92 Units in Rail

TPS92641PWPT

16L TSSOP EXP PAD

MXA16A

250 Units on Tape and Reel

TPS92641PWPR

2500 Units on Tape and Reel

2

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Product Folder Links: TPS92640 TPS92641