RT8541A - Richtek

RT8541A Boost DC/DC Converter

The RT8541/A is a constant frequency current mode PWM step-up DC/DC converter designed to bias avalanche photodiodes (APD) at high voltage in optical receivers. It includes a voltage doubler charge pump to significantly reduce the noise level at output up to 90V. The RT8541A switching frequency can be adjusted by a resistor while RT8541 is internally set at .

Features

a built-in 9ms soft-start function to eliminate the inrush current during start-up interval. The RT8541/A provides a low cost optical receiver solution and can fit in very small PCB area. The RT8541/A is available in the WQFN-16L 3x3 package. Features
 Integrated Schottky Diodes for Charge Pump Voltage Doubler
 50V, 400mA Internal Switch
 High Side Low Noise and Accurate APD Current Monitor
 650kHz Fixed Switching Frequency for RT8541 and Adjustable Switching Frequency for RT8541A
 Wide VIN Range : 2.7V to 16V
 Adjustable APD Current Limit with External Resistor
 Low Shutdown Current <.