RT8541A Datasheet | Richtek

® RT8541/A 90V Boost DC/DC Converter with APD Current Monitor General Description 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 650kHz. The RT8541/A has a built-in APD current mirror that delivers 1/5 of the APD current with high accuracy for monitoring the APD current from 0.25μA to 2.5mA. This current can be used as a reference to provide a digital programmed output voltage via...