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  Richtek Technology Electronic Components Datasheet  

RT9373A Datasheet

3-Channel Charge Pump White LED Driver

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RT9373A
3-Channel Charge Pump White LED Driver with Low
Dropout Current Source
General Description
Features
The RT9373A is a high efficiency and cost effective charge
pump white LED driver. It supports up to 3 white LEDs
with regulated constant current for uniform intensity. The
RT9373A maintains the highest efficiency by utilizing a
x1/x1.5/x2 charge pump and low dropout current
regulators.
User can easily configure each LED current from 1.25mA
to 20mA by a pulse dimming control. The dimming of white
LEDs current can be achieved by applying a pulse signal
to the EN pin. There are totally 16 steps of current could
be set by users.
z Very High Efficiency Over 80% of Battery Life
z Support up to 3 White LEDs
z Support Up to 60mA Output Current
z 1% Typical LED Current Matching
z Soft Start Function
z Auto Charge Pump Mode Selection
z 250kHz Fixed Frequency Oscillator
z Output Over Voltage Protection
z 16 Steps Brightness Control
z Low Input Noise and EMI
z RoHS Compliant and 100% Lead (Pb)-Free
RT9373A is available in a WQFN3x3-16L package.
Applications
Ordering Information
RT9373A
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
z Mobile Phone, DSC, MP3
z White LED Backlighting
z LCDDisplay Supply
Pin Configurations
(TOP VIEW)
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
NC
NC
GND
C1P
1
2
3
4
16 15 14 13
12 EN
11 NC
10 GND
17
9 C2P
5678
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
WQFN-16L 3x3
DS9373A-04 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9373A Datasheet

3-Channel Charge Pump White LED Driver

No Preview Available !

RT9373A
Typical Application Circuit
VCC
2.8V to 5.5V
GPIO
CPUMP1 CPUMP2
1uF 1uF
4
5, 13
VIN
CIN
2.2uF
12 EN
3, 10 GND
79
RT9373A
6
VOUT 8
COUT
2.2uF
LED3
LED2
LED1
16
15
14
Figure 1. For 3-WLEDs Application Circuit
VCC
2.8V to 5.5V
GPIO
CPUMP1 CPUMP2
1uF 1uF
4 79 6
5, 13
VIN
CIN
2.2uF
12 EN
3, 10 GND
RT9373A
8
VOUT
COUT
2.2uF
LED3
LED2
LED1
16
15
14
Figure 2. For 2-WLEDs Application Circuit
www.richtek.com
2
DS9373A-04 April 2011


Part Number RT9373A
Description 3-Channel Charge Pump White LED Driver
Maker Richtek
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RT9373A Datasheet PDF






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