RT6908

4

DS6908-01

March 2013

www.richtek.com

Copyright

2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

©

Functional Pin Description

Pin No.

Pin Name

Pin Function

1, 13, 17,

41(Exposed Pad)

PGND

Power Ground. The exposed pad must be soldered to a large PCB and

connected to PGND for maximum thermal dissipation.

2

FBB1

Feedback Input for Buck1 Converter.

3

COMP1

Compensation Pin for Buck1 Converter. This pin is the output node of the

error amplifier.

4

RSTB

Voltage Detector Open-Drain Output.

5

SDA

I

2

C Compatible Serial Data Input/Output.

6

SCL

I

2

C Compatible Serial Clock Input.

7

VDET

Voltage Detector Input.

8

AVDD

Output Sense Pin for Boost Converter AVDD.

9

GD

Gate Drive. Used to control an external MOSFET switch to provide input to

output isolation of AVDD.

10

LXI

Isolation Switch Input.

11

COMP

Boost Converter (AVDD) Compensation. Connect a compensation network

to ground.

12

A0

I

2

C Compatible Device Address Bit 0.

14, 15, 16

LX

Boost Converter (AVDD) Switch. Connect an inductor between this pin and

input voltage source.

18

VGL

Output Sensing Pin of VGL Negative Charge Pump.

19

VGH

Output Sensing Pin of VGH Positive Charge Pump.

20

DRVP

Base Drive of External PNP Transistor for VGH Positive Charge Pump.

21

DRVN

Base Drive of External NPN Transistor for VGL Negative Charge Pump.

22

CRST

Voltage Detector Delay Capacitor Connection. Connect capacitor from this

pin to ground.

23

COMP2

Compensation Pin for Buck2 Converter.

24

FBB2

Feedback Input for Buck2 Converter.

25

ILIMIT2

Current Limit Adjustment for Buck2 Converter. Connect a resistor from

ILIMIT2 to AGND to adjust the current limit threshold below 300mV.

26

DLB2

Low Side Gate Driver Output for Buck2 Converter.

27, 37

NC

Not Internal Connected. Should be floating or connected to GND

SDA

SCL

START

Condition

Repeated Start

Condition

STOP

Condition

START

Condition