MAX1846 - Maxim

MAX1846 High-Efficiency / Current-Mode / Inverting PWM Controller

MAX1846/MAX1847 high-efficiency PWM inverting controllers allow designers to implement compact, lownoise, negative-output DC-DC converters for telecom and networking applications. Both devices operate from +3V to +16.5V input and generate -2V to -200V output. To minimize switching noise, both devices feature a current-mode, constant-frequency PWM control sch.

Features

clock synchronization and shutdown functions. The MAX1847 can also be configured to operate as an inverting flyback controller with an Nchannel MOSFET and a transformer to deliver up to 70W. The MAX1847 is available in a 16-pin QSOP package. Current-mode control simplifies compensation and provides good transient response. Accurate current-mode control and over current protection are achieved through low-side current sensing. o 90% Efficiency o +3.0V to +16.5V Input Range o -2V to -200V Output o Drives High-Side P-Channel MOSFET o 100kHz to 500kHz Switching Frequency o Current-Mode, PWM Contro.