RT9367C

4

DS9367C-01 March 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

C1N

Fly Capacitor 1 Negative Connection.

2

C2N

Fly Capacitor 2 Negative Connection.

3

PGND

Power Ground.

4

C2P

Fly Capacitor 2 Positive Connection.

5

C1P

Fly Capacitor 1 Positive Connection.

6

PVIN

Power Input.

7

SCL

8

SDA

9

ENA

Chip Enable (Active High).

10, 15

NC

No Internal Connection.

11

AGND

Analog Ground.

12

LDO1

LDO 1 Output.

13

AVIN

Analog Power Input.

14

LDO2

LDO 2 Output.

16

LED4

Current Sink for LED4.

17

LED3

Current Sink for LED3.

18

LED2

Current Sink for LED2.

19

LED1

Current Sink for LED1.

20

VOUT

Charge Pump Output.

21 (Exposed Pad)

GND

The exposed pad must be soldered to a large PCB and connected to GND for

maximum power dissipation.

Function Block Diagram

PVIN

LED1

LED2

LED3

VOUT

LED4

SCL

Current

Limitation

Soft Start

Circuit

DAC

32 Steps

Current Setting

Register

Channel

Selecting

Register

Current

Bias

UVLO

BandGap

Reference

Gate Driver

x1/x1.5/x2

Mode Decision

1MHz

Oscillator

x1/x1.5/x2

Charge Pump

Low Dropout Current

Source

32 Step Voltage

Reference Register 2

+

-

AVIN

+

-

32 Step Voltage

Reference Register 1

+

-

I

OTP

SDA

LDO2

LDO1

PGND

OVP

+

-

AVIN

AGND

ENA