RT9385 Datasheet, PDF (1/10 Pages) Richtek Technology Corporation – 5 Channels 125mA x1/x1.5/x2 Charge Pump White LED Driver

RT9385
5 Channels 125mA x1/x1.5/x2 Charge Pump White LED Driver
General Description
The RT9385 is a 5 Channel WLED driver with auto mode
selection of x1, x1.5 and x2 mode with low dropout voltage
in current sources. The RT9385 can power up to 5 white
LEDs with regulated constant current for uniform intensity.
Each channel (LED1 to LED5) can support up to 25mA.
The part maintains highest efficiency by utilizing x1/x1.5/
x2 fractional charge pump and low dropout current
regulators. For the brightness control, user can easily use
a PWM signal generated from GPIO to control the
brightness of WLEDs.
The RT9385 is available in a WQFN-16L 2x3 package.
Small 1μF capacitors can be used for fly capacitors. It
provides the best backlighting solution with high efficiency
and smallest board space for portable application.
Ordering Information
RT9385
Package Type
QW : WQFN-16L 2x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
z 85% Average Efficiency Over Li-ion Battery
Discharge
z Support Up to 5 White LEDs
z Support Up to 25mA/Per Channel
z PWM Brightness Control
z 60mV Current Source Dropout
z 1% LED Current Accuracy
z 0.7% LED Current Matching
z Automatic x1/x1.5/x2 Charge Pump Mode
Transition
z Low Input Noise and EMI
z Over Voltage Protection
z Power On/Mode Transition Inrush Protection
z 1MHz Switching Frequency
z 0.4μA Low Shutdown Current
z RoHS Compliant and Halogen Free
Applications
z Camera Phone, Smart Phone
z White LED Backlighting
Pin Configurations
(TOP VIEW)
LED3 1
LED4 2
LED5 3
VOUT 4
PGND 5
16 15 14
GND
17
6 78
13 AGND
12 CF
11 VIN
10 EN
9 C2P
WQFN-16L 2x3
DS9385-01 April 2011
www.richtek.com
1