2

FN9228.1

December 14, 2007

Pin Descriptions

PIN NUMBER

PIN NAME

FUNCTION

1

GND

Ground

2

VGH_M

Gate Pulse Modulation Output

3

VFLK

Gate Pulse Modulation Control Input

4

VDPM

Gate Pulse Modulation Enable

5

VDD_1

Gate Pulse Modulation Lower Voltage Input

6VDD_2

7OUT

8NEG

9POS

10

AGND

11

ADJ

LDO Output Adjust Pin

12

LDO_OUT

LDO Output

13

VIN_1

LDO power supply

14

SS

Boost Converter Soft-start. Connect a capacitor between this pin and GND to set the soft-start

time.

15

COMP

Boost Converter Compensation Pin. Connect a series resistor and capacitor between this pin and

GND to optimize transient response.

16

FREQ

Boost Converter Frequency Select.

17

VIN_2

Boost Converter Power Supply

18

LX

Boost Converter Switching Node

19

ENABLE

Chip Enable Pin. Connect to VIN1 for normal operation, GND for shutdown.

20

FB

Boost Converter Feedback

21

PGND

Boost Converter Power Ground

22

CE

Gate Pulse Modulator Delay Control. Connect a capacitor between this pin and GND to set the

delay time.

23

RE

Gate Pulse Modulator Slew Control. Connect a resistor between this pin and GND to set the falling

slew rate.

24

VGH

Gate Pulse Modulator High Voltage Input

ISL97644