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发布者:微桥 发布时间:2010/1/20 阅读:8036次    关键字: AX7701/A
AX7701/A-Charge Pump White LED Driver


AX7701/A-White LED Driver(120mA Charge Pump with Current Source)DataSheet

GENERAL DESCRIPTION
    The AX7701/A is a high efficiency charge pump white LED driver. It supports up to4 white LEDs with regulated constant current for uniform intensity. The AX7701/A
maintains the highest efficiency by utilizing a x1/x1.5/x2 fractional charge pump and low dropout current regulators.
    User can easily configure each LED current up 30mA by an external resistor. Two
digital inputs can be programmable to control white LED On/Off. LED dimming can be achieved by applying a PWM signal to the digital control signals. The operating voltage range is 2.5V to 5.5V. Internal soft-start circuitry effectively reduces the in-rush current both while start-up and mode change. AX7701/A also provides comprehensive protections such short circuit protection and over-temperature protection. The load is disconnected from VIN while shutdown and the shutdown current is less than 1uA. AX7701/A is available in a QFN-16L 3x3mm package.

FEATURES
- Very High Efficiency Over 90% of Battery Life
- Support up to 4 WLEDs
- Support up to 120mA Output Current
- Soft Start / Short Circuit Protection Function
- Three Charge Pump Mode: x1, x1.5, x2
- 250k/1MHz Fixed Frequency Oscillator
- RoHS Compliant and 100% Lead (Pb)-Free

 

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