RT9368A Datasheet, PDF (3/12 Pages) Richtek Technology Corporation – 4-Channel Charge Pump White LED Driver with Low Dropout Current Source

RT9368A
30us < t_{READY 0.5us < tHI} 0.5us < t_LO < 500us
2ms < t_SHDN
EN ₀
1 2 3 45
Shutdown ^{100% 15/16 14/16 13/16} 12/16
ILEDX
14 15 0 1
100% _15/16
2/16 _1/16
Shutdown
Figure 4. Brightness control by pulse dimming. RT9368A implements 16 steps brightness control
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
LED 4
2, 11,
NC
17 (Exposed Pad)
3
GND
Output Current for LED4. (If not in use, pin should be connected to GND).
No Internal Connection.
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
10
GND
Ground.
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, pin should be connected to GND).
15
LED 2
Output Current for LED2. (If not in use, pin should be connected to GND).
16
LED 3
Output Current for LED3. (If not in use, pin should be connected to GND).
DS9368A-06 April 2011
www.richtek.com
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