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RT92691 Datasheet

  • RT92691

  • Step-up DC/DC Converter

  • 10頁

  • ETC

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Preliminary
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鈥檚.
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 17碌A low
quiescent current together with high efficiency
maintains long battery lifetime.
The output current is set with 1 external resistor.
And the chip enable (CE) pin can be used for tuning
the LED brightness by controlling the ON/OFF duty
with external clock. RT9269 is provided in SOT-26
package.
Features
0.25V Low Reference Voltage
17碌A Quiescent (Switch-off) Supply Current
Zero Shutdown Mode Supply Current
85% Efficiency
500kHz Fixed Switching Rate
Tuning LED brightness with CE pin ON/OFF
Duty
Small SOT-26 Package
Applications
LED Module
Hand Held Panel
Compact Back Light Module
Small Battery Charger
Constant Current Source
Pin Configurations
Part Number
RT9269CE
(Plastic SOT-26)
Pin Configurations
TOP VIEW
6
5
4
Ordering Information
RT9269
Package Type
E : SOT-26
Operating Temperature Range
C: Commercial Standard
1
2
3
1.
2.
3.
4.
5.
6.
CE
EXT
GND
LX
VDD
FB
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.
DS9269-01 March 2003
www.richtek.com
1

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