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  Richtek Technology Electronic Components Datasheet  

RT9364 Datasheet

80mA 4-Channel Charge Pump White LED Driver

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Preliminary
RT9364
80mA 4-Channel Charge Pump White LED Driver
with Low Dropout Current Source
General Description
The RT9364 is a high performance white LED driver. It
integrates current sources and automatic mode selection
charge pump. The part maintains the high efficiency by
utilizing an x1/x1.5 fractional charge pump and low dropout
current sources. The small equivalent x1 mode open loop
resistance and ultra-low dropout voltage of current source
extend the operating time of x1 mode and optimize the
efficiency of Li-ion battery in white LED applications.
The RT9364 supports up to 4 white LEDs and regulates a
constant current for uniform intensity. The part implements
a 4-bit DAC for brightness control. Users can easily
configure the LED current from 1.25mA to 20mA by a serial
pulse. 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. The operating
voltage range is 2.8V to 5.0V. Internal soft start circuitry
effectively reduces the in-rush current while both start-up
and mode transition. The load is disconnected from VIN
while shutdown and the shutdown current is less than
1μA.
RT9364 is available in a WQFN 3x3-16L package.
Ordering Information
RT9364
Package Type
QW : WQFN-16L 3x3 (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
Note :
RichTek Pb-free 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.
`100% matte tin (Sn) plating.
Features
z 85% Average Efficiency Over Battery Life
z Support up to 4 White LEDs
z 80mV Typical Current Source Dropout
z Support up to 80mA Output Current
z 1% Typical LED Current Accuracy
z 0.7% 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-Step Brightness Control
z Low Input Noise and EMI
z Low 0.3μA Shutdown Current
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Mobile Phone, DSC, MP3
z White LED Backlighting
z LCDDisplay Supply
Pin Configurations
(TOP VIEW)
16 15 14 13
C1N
C2N
C2P
C1P
1
2
3
4
GND
12 LED2
11 LED3
10 LED4
9 NC
5678
WQFN-16L 3x3
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
DS9364-00 May 2006
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9364 Datasheet

80mA 4-Channel Charge Pump White LED Driver

No Preview Available !

RT9364
Typical Application Circuit
Preliminary
+
Li-ion
Battery
CFLY 1uF CFLY 1uF
4 13 2
C1P C1N C2P C2N
7 VIN
CIN
1uF
Pulse Input
8 EN
14 VOUT
RT9364
16 VNG
COUT
1uF
5 AGND
PGND
6
LED1 13
LED2 12
LED3 11
LED4 10
Figure 1. For 4-WLEDs Application Circuit
+
Li-ion
Battery
CFLY 1uF CFLY 1uF
4 13 2
C1P C1N C2P C2N
7 VIN
CIN
1uF
Pulse Input
8 EN
14 VOUT
RT9364
16 VNG
COUT
1uF
5 AGND
PGND
6
LED1 13
LED2 12
LED3 11
LED4 10
Figure 2. For 3-WLEDs Application Circuit
30us < tREADY 0.5us < tHI 0.5us < tLO < 500us
3ms < tSHDN
EN 0
1 2 3 4 5 14
Shutdown
ILEDX
100% 15/16 14/16 13/16 12/16 3/16
2/16
15 0 1
100% 15/16
1/16
Shutdown
Figure 3. Brightness control by pulse dimming
www.richtek.com
2
DS9364-00 May 2006


Part Number RT9364
Description 80mA 4-Channel Charge Pump White LED Driver
Maker Richtek Technology
PDF Download

RT9364 Datasheet PDF






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