View mic9130 datasheet:

MIC9130 Micrel MIC9130 High-Voltage, High-Speed Telecom DC-to-DC Controller Final Information General Description Features The MIC9130 is a current-mode PWM controller that effi- • Input voltages up to 180V ciently converts –48V telecom voltages to logic levels. The • Internal oscillator capable of >2.5MHz operation MIC9130 features a high voltage start-up circuit that allows • Synchronisation capability to 4MHz the device to be connected to input voltages as high as 180V. • Current sense delay of 34ns The high input voltage capability protects the MIC9130 from • Minimum pulse width <25ns line transients that are common in telecom systems. The • 90% efficiency start-up circuitry also saves valuable board space and simpli- • 1.3mA quiescent current fies designs by integrating se