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LED驱动器IA2505.pdf
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The IA2505 is a high-efficiency, low-cost, high-current, parallel LED driver current source specifically designed for running flash and backlighting LEDs. The LED current can be set from 5mA to 80mA on each channel, and the individual LED currents are matched to within +/-10%. LED pulse current can be as high as 200mA for duration of 20msec or less.
LED brightness can be varied up to the programmed LED current by applying a Pulse Width Modulated (PWM) signal to the EN pin of the device. The LED output current of the IA2505 is tightly controlled over temperature and voltage.
The input supply range is from 2.7V to 5.5V which is ideally suited for single-cell Li-Ion battery supplies. Dropout voltage is only 30mV at 20mA, permitting direct operation from a Li-Ion battery. The IA2505 can also be operated from two or three Alkaline batteries. The only external component required is a resistor that sets the current on each of the four channels.
The IA2505 typically draws only 40µA when operating in the no-load condition and draws less than 0.01µA when the device is shutdown.
The IA2505 is available in an MSOP-8 and a space-saving 3mm x 3mm DFN package.
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