RT9368

3

DS9368-07 April 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

LED 4

Output Current for LED4. (If not in use, this pin must be connected to GND).

2, 17 (Exposed Pad) NC

No Internal Connection.

3, 10

GND

Ground.

4

C1P

Positive Terminal of Bucket Capacitor 1.

5

VIN

Power Input Voltage.

6

C2N

Negative Terminal of Bucket Capacitor 2.

7

C1N

Negative Terminal of Bucket Capacitor 1.

8

VOUT

Output Voltage Source.

9

C2P

Positive Terminal of Bucket Capacitor 2.

11

ISET

pin to ground. Do not short the ISET pin to GND directly.

12

EN

Chip Enable (Active High). Note that this pin is high impedance.

13

VIN

Power Input Voltage.

14

LED 1

Output Current for LED1. (If not in use, this pin must be connected to GND).

15

LED 2

Output Current for LED2. (If not in use, this pin must be connected to GND).

16

LED 3

Output Current for LED3. (If not in use, this pin must be connected to GND).

Function Block Diagram

EN

LED1

LED4

LED2

LED3

250kHz

OSC

16 Steps Pulse

Dimming Controller

Soft Start

Circuit

Current Source

Shutdown Delay

VIN

VOUT

Gate Driver

UVLO

OVP

Min VDS

+

-

C1P

C2P

C2N

C1N

Mode Decision

Current

Bias

Vr2

GND

ISET