RT9385

2

DS9385-01 April 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

LED3

Current Sink for LED3. (If not in use, this pin should be connected to VIN)

2

LED4

Current Sink for LED4. (If not in use, this pin should be connected to VIN)

3

LED5

Current Sink for LED5. (If not in use, this pin should be connected to VIN)

4

VOUT

Charge Pump Output.

5

PGND

Ground.

6

C2N

Fly Capacitor 2 Negative Connection.

7

C1N

Fly Capacitor 1 Negative Connection.

8

C1P

Fly Capacitor 1 Positive Connection.

9

C2P

Fly Capacitor 2 Positive Connection.

10

EN

Chip Enable (Active High).

11, 14

VIN

Power Input.

12

CF

PWM Filter Capacitor Connection, No Connection if this pin is not in use.

13

AGND

Ground.

15

LED1

Current Sink for LED1. (If not in use, this pin should be connected to VIN)

16

LED2

Current Sink for LED2. (If not in use, this pin should connected to VIN)

17 (Exposed Pad) GND

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

maximum power dissipation.

Typical Application Circuit

C2N

LED4

PGND

VIN

C1P C1N C2P

RT9385

EN

VOUT

LED3

LED2

LED1

1µF

1µF

1µF

10

13

8

14,11

4

AGND

7

6

9

5

15

16

1

2

1µF

PWM Input

3

LED5

CF

12

0.1µF