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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