MIC9131 High-Voltage, High-Speed Telecom DC-to-DC Controller

The MIC9131 is a current-mode PWM controller that ef,ciently converts 48V telecom voltages to Logic levels. The MIC9131 features a high voltage start-up circuit that allows the device to be connected to input voltages as high as 180V. The high input voltage capability protects the MIC9131 from line transients that are common in telecom systems. The start-up circuitry also saves valuable board space and simpli,es designs by integrating several external components. By Micrel Semiconductor