RT9378 RICHTEK [Richtek Technology Corporation], RT9378 Datasheet - Page 9

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

DS9378-03 April 2011
The traces running
from pins to flying
capacitor should
be short and wide
to reduce parasitic
resistance and
prevent noise
radiation.
Output capacitor (C
V
noise coupling from charge pump to LEDs.
GND
OUT
Input capacitor (C
and connected to ground plane. The trace of VIN in
the PCB should be placed far away the sensitive
devices or shielded by the ground.
and connected to ground plane to reduce
Figure 2. PCB Layout for RT9378
GND
C1N
C1P
OUT
1
2
3
C
C
IN
OUT
12
) should be placed close to
4
IN
) should be placed close to V
GND
11
5
13
10
6
9
8
7
LED3
LED2
LED1
IN
All the traces of
LED pins running
from chip to LEDs
should be wide and
short to reduce the
parasitic connection
resistance.
Battery
RT9378
www.richtek.com
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