RT9269 Datasheet | Richtek

Description The RT9269 is a pact, high efficient LED driver with high flexibility of application configurations in charge pump mode or in boost rectifier mode, delivering Tens of m A 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 500k Hz high switching rate minimized the size of external ponents. 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 (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 17µA Quiescent (Switch-off) Supply Current Zero Shutdown Mode Supply Current 85% Efficiency 500k Hz Fixed Switching Rate Tuning LED brightness with CE pin ON/OFF Duty Small SOT-26 Package Applications LED Module Hand Held Panel pact 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: mercial Standard 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 Rich Tek distributor located in your area, otherwise visit our website for detail. DS9269-01 March 2003 .richtek. Typical Application Circuit VIN C1 1µ F VDD Preliminary C2 1µ F EXT 0.25V R1 15Ω R2 15Ω C3 1µ F RT9269 To VDD or Duty Control Brightness CE GND FB Fig. 1 RT9269 drives single or parallel LED’s in charge pump configuration D1 VIN C1 1µ F VDD EXT 0.25V R1 15Ω C2 1µ F C3 1µ F D2 RT9269 To VDD or Duty Control Brightness CE GND...