UNISONIC TECHNOLOGIES CO., LTD L5201
LOW NOISE, REGULATED CHARGE PUMP DC/DC CONVERTERS
6 5
CMOS IC
MSOP-8 4
DESCRIPTION
The UTC L5201-xx series are low noise, constant frequency charge pump DC/DC converters and designed to increase efficiency in white LED application. The operating voltage range is 2.7V ~ VOUT input with up to 100mA of output current. Low external parts counts (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the UTC L5201-xx series ideally suited for small, battery-powered applications. A charge-pump architecture maintains constant switching frequency to zero load and reduces both output and input ripple. The UTC L5201-xx series have thermal shutdown capability to escape the device damaged from a continuous short-circuit. With built-in soft-start circuitry to prevents excessive current flow at VIN during start-up. High switching frequency enables the use of small ceramic capacitors. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to
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