Flash LED Driver with 700mA Charge Pump CXUS65171 is a charge pump for high-current white LED driving used in camera flash applications. The architecture of two bucket capacitors is used to decrease

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The CXUS65171 is a charge pump for high-current white LED driving used in camera flash applications. The architecture of two bucket capacitors is used to decrease the output ripple and provides low EMI solution compared to inductive DC-DC regulators. The CXUS65171 has independent flash/torch/shutdown modes. The CXUS65171 is capable to output 500mA of regulated current in flash mode for the duration greater than 500ms. While driving 700mA output current, the reduced duration is limit by CXUS65171’s over-temperature protection. There is a one second safety timer in this mode to avoid LED damage caused by overheat. The CXUS65171 can outputs 20% of flash mode current continuously in torch mode. The flash mode has priority over the torch mode. A resistor connected to ISET pin, which is in series with the LED, is to set the current. The ISET voltage is 250mV and 50mV in flash and torch mode respectively. The GCXUS65171is available in tiny 10-pin 3x3mm TDFN package.

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„ Independent flash/torch/shutdown modes wq3嘉泰姆

„ Up to 700mA drive current wq3嘉泰姆

„ Flash timeout protection wq3嘉泰姆

„ Torch mode set to 20% of flash current wq3嘉泰姆

„ 1X/2X mode for torch mode to maximize efficiency wq3嘉泰姆

 „ Wide input voltage range from 3V to 5.5V wq3嘉泰姆

„<1μA shutdown current wq3嘉泰姆

„ Input/Output over-voltage protection wq3嘉泰姆

„ Short-circuit protection wq3嘉泰姆

„ Over-temperature protection wq3嘉泰姆

„ Tiny TDFN3X3-10 packagewq3嘉泰姆

   应用范围 返回TOPwq3嘉泰姆

„ Cellular camera phone wq3嘉泰姆

„ Digital still camera wq3嘉泰姆

„ PDA camera wq3嘉泰姆

„ Camcorder torch lampwq3嘉泰姆

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