MAX1516 charge pump drive circuit diagram


Posted on Mar 28, 2007

MAX1516 charge pump drives up to 8 from light LED, with a constant current regulation, in order to achieve a uniform light intensity, it can drive up to 30mA each LED, used for backlighting.


MAX1516 charge pump drive circuit diagram
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Flash group LED (LED5 ~ LED8) is individually controlled, and capable of 100mA drive current for each LED (total of 400mA). By using an adaptive 1 , 1.5 , 2 mode charge pump and low-dropout current regulators, MAX1576 can achieve high efficiency over a lithium-ion battery entire voltage range. Since the fixed switching frequency of 1MHz, only the use of very small external components, regulation scheme is optimized to ensure low EMI and low input ripple. Maximum MAX1576 uses two external resistors to set the main LED flash and LED (100%) current. ENM1 and ENM2 pin main LED current is set to 10% of the maximum current, 30% or 100%. ENF1 ENF2 pin and the flash LED current is set to 20% of the maximum current, 40% or 100%. In addition, each pair of control pins can be connected together to achieve single-wire, serial pulse dimming control. Main technical characteristics (1) MAX1576's O drive up to 8 LED. 30mA drive for backlighting, 400mA drive for flash. the entire lithium-ion battery discharge process can achieve 85% average efficiency, LED current matching accuracy of 0.7%. adaptive 1 , 1.5 , 2 mode switching, flexible brightness control. single-wire, serial-pulse interface (5% to 100%), 2 (Level 3) for the number of logic. low input ripple and EMI, 0.1 A low shutdown current. power supply voltage range of 2.7 ~ 5.5V. has a soft start to limit inrush current, output overvoltage protection and thermal shutdown protection. MAX1576 4mm 4mm 24-pin thin QFN package (maximum thickness of 0.8mm). (2) Typical Application Circuit MAX1576 charge pump white LED driver circuit as shown in FIG.




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