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