General Description

The MIC38C4x are fixed frequency, high performance, current-mode PWM controllers. Micrel’s BiCMOS devices are pin compatible with 384x bipolar devices but feature several improvements.

Features

•  Fast 40ns output rise and 30ns output fall times

•  –40°C to +85°C temperature range meets UC284x specifications

•  High-performance, low-power BiCMOS Process

•  Ultralow start-up current (50µA typical)

•  Low operating current (4mA typical)

•  CMOS outputs with rail-to-rail swing

•  ≥ 500kHz current-mode operation

•  Trimmed 5V bandgap reference

•  Pin-for-pin compatible with UC3842/3843/3844/3845(A)

•  Trimmed oscillator discharge current

•  UVLO with hysteresis

•  Low cross-conduction currents

Features

•  Fast 40ns output rise and 30ns output fall times

•  –40°C to +85°C temperature range

meets UC284x specifications

•  High-performance, low-power BiCMOS Process

•  Ultralow start-up current (50µA typical)

•  Low operating current (4mA typical)

•  CMOS outputs with rail-to-rail swing

•  ≥ 500kHz current-mode operation

•  Trimmed 5V bandgap reference

•  Pin-for-pin compatible with UC3842/3843/3844/3845(A)

•  Trimmed oscillator discharge current

•  UVLO with hysteresis

•  Low cross-conduction currents