The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. Micrel's BiCMOS devices are pin-compatible with 384x bipolar devices. Their high output drive, with fast rise and fall times, combined with low startup current make it an ideal PWM controller where high efficiency is required.Undervoltage lockout circuitry allows the '42 and '44 versions to start up at 14.5V and operate down to 9V, and the '43 and '45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 20V.When compared to bipolar UC384x devices operating from a 15V supply, start-up current has been reduced to 50µA typical and operating current has been reduced to 4.0 mA typical. Decreased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases efficiency, especially at lower supply voltages. The MIC38HC4x also features a trimmed oscillator discharge current and bandgap reference.MIC38HC4x-1 is available in 14-pin plastic DIP and SOIC packages. 8-pin devices feature small size, while 14-pin devices separate the analog and power connections for improved performance and power dissipation.

  Fast 20ns output rise and 15ns output fall times

  -40°C to +85°C temperature range exceeds UC284x specifications

  High-performance, low-power BiCMOS Process

  Ultra-low start-up current (50µA typical)

  Low operating current (4mA typical)

  High output drive (1A peak current, HC version)

  CMOS outputs with rail-to-rail swing

  Current-mode operation up to 500kHz

  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