RT9378 RICHTEK [Richtek Technology Corporation], RT9378 Datasheet - Page 2

• Manufacturer Part Number: RT9378
• Description: 4 CHs 100mA x1/x1.5/x2 Charge Pump White LED Driver
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT9378
Functional Pin Description
Function Block Diagram
www.richtek.com
2
13 (Exposed Pad)
Pin No.
10
12
11
1
2
3
4
5
6
7
8
9
C1N
GND
C1P
C2P
VIN
EN
LED1
LED2
LED3
LED4
VOUT
C2N
Pin Name
GND
VIN
EN
Fly Capacitor 1 Negative Connection.
Ground Pin. The exposed pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
Fly Capacitor 1 Positive Connection.
Fly Capacitor 2 Positive Connection.
Power Input.
Chip Enable (Active High).
Current Sink for LED1. (If not in use, connect this pin to VIN)
Current Sink for LED2. (If not in use, connect this pin to VIN)
Current Sink for LED3. (If not in use, connect this pin to VIN)
Current Sink for LED4. (If not in use, connect this pin to VIN)
Charge Pump Output.
Fly Capacitor 2 Negative Connection.
2µA
C1P
Gate Driver
Mode Decision
UVLO
Shutdown Delay
PWM Dimming
Controller
C1N
Current
Bias
C2P C2N
1MHz
OSC
Current Source
Pin Function
Soft Start
Min VDS
OVP
Circuit
+
-
Vr1
VOUT
LED1
LED2
LED3
LED4
DS9378-03 April 2011