RT9385B Datasheet, PDF (1/10 Pages) Richtek Technology Corporation – 5 Channels 125mA x1/x1.5/x2 Charge Pump White LED Driver

RT9385B
5 Channels 125mA x1/x1.5/x2 Charge Pump White LED Driver
General Description
The RT9385B 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 RT9385B 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. An internal 5-bit DAC is used for brightness
control. Users can easily configure up to 32 steps of LED
current by enable pin.
The RT9385B 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
RT9385B
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 Support Up to 125mA Output Current
z Flexible 32 Step 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 Charge Pump
z 5V Over Voltage Protection
z Power On/Mode Transition Inrush Protection
z 1MHz Frequency Oscillator
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 NC
11 VIN
10 EN
9 C2P
WQFN-16L 2x3
DS9385B-01 April 2011
www.richtek.com
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