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.
Features
0.25V Low Reference Voltage
17μA Quiescent (Switch-off) Supply Current
μ
Zero Shutdown Mode Supply Current
85% Efficiency
500kHz Fixed Switching Rate
Tuning LED brightness with EN Pin ON/OFF Duty
Small
SOT-23-6
Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
LED Module
Hand Held Panel
Compact Back Light Module
Small Battery Charger
Constant Current Source
Pin Configurations
(TOP VIEW)
FB
VDD
5
2
LX
4
3
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)
6
1
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.
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.
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
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
