RT9269_07 Datasheet, PDF (1/9 Pages) Richtek Technology Corporation – Tiny Package, High Efficiency, Constant Current LED Driver

RT9269
Tiny Package, High Efficiency, Constant Current LED Driver
General Description
The RT9269 is a compact, high efficient LED driver with
high flexibility of application configurations in charge pump
mode or in boost rectifier mode, delivering Tens of mA
constant output current for driving 1~4 white LED's.
The 0.25V low reference voltage minimized the power loss
across the current-setting resistor.
The wide applicable VDD range makes RT9269 suitable for
1 to 4 battery cell applications as well as being supplied
with 2.5/3.3/5/6V system powers. The 500kHz high
switching rate minimized the size of external components.
Besides, the 17μA low quiescent current together with high
efficiency maintains long battery lifetime.
The output current is set with 1 external resistor. And the
chip enable (EN) pin can be used for tuning the LED
brightness by controlling the ON/OFF duty with external
clock. RT9269 is provided in SOT-23-6 package.
Ordering Information
RT9269
Package Type
E : SOT-23-6
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
RichTek Pb-free and Green 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 0.25V Low Reference Voltage
z 17μA Quiescent (Switch-off) Supply Current
z Zero Shutdown Mode Supply Current
z 85% Efficiency
z 500kHz Fixed Switching Rate
z Tuning LED brightness with EN Pin ON/OFF Duty
z Small SOT-23-6 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z LED Module
z Hand Held Panel
z Compact Back Light Module
z Small Battery Charger
z Constant Current Source
Pin Configurations
(TOP VIEW)
FB VDD LX
65 4
123
EN EXT GND
SOT-23-6
Note : There is no pin1 indicator on top mark for SOT-23-6
type, and pin 1 will be lower left pin when reading top mark
from left to right.
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.
DS9269-10 March 2007
www.richtek.com
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