LP8545

SNVS635D – APRIL 2010 – REVISED DECEMBER 2013

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Pin #

Name

Type

Description

1

GND_SW

G

Boost switch ground

2

PWM

A

PWM dimming input. This pin must be connected to GND if not used.

3

ISET

A

Set resistor for LED current. This pin can be left floating if not used.

4

EN

I

Enable input pin

5

FSET

A

PWM frequency set resistor. This pin can be left floating if not used.

6

GD

A

Gate driver for external FET. If not used, can be left floating.

7

FAULT

OD

Fault indication output. If not used, can be left floating.

8

VDDIO

P

PWM input pin then this pin can be connected to GND.

9

GND_S

G

Signal ground

10

SCLK

I

Serial clock. This pin must be connected to GND if not used.

11

SDA

I/O

Serial data. This pin must be connected to GND if not used.

12

OUT1

A

Current sink output

13

OUT2

A

Current sink output

14

OUT3

A

Current sink output

15

GND_L

G

LED ground

16

OUT4

A

Current sink output

17

OUT5

A

Current sink output

18

OUT6

A

Current sink output

19

VSYNC

I

20

FILTER

A

Low pass filter for PLL. This pin can be left floating if not used.

21

FB

A

Boost feedback input

22

VLDO

P

LDO output voltage. External 5V rail can be connected to this pin in low voltage

application.

23

VIN

P

Input power supply up to 22V. If 2.7V

≤ VBATT < 5.5V (Typical Application for Low

Input Voltage (2)) then external 5V rail must be used for VLDO and VIN.

24

SW

A

Boost switch. With external FET (typ. app. (3)) this pin acts as a current sense.

(1)

A: Analog Pin, G: Ground Pin, P: Power Pin, I: Input Pin, I/O: Input/Output Pin, O: Output Pin, OD: Open Drain Pin

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.

4

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