DESCRIPTION

· The MIC38HC4x family are BiCMOS fixed frequency current-mode PWM controllers with 1A drive current capability.

· Pin-compatible with 384x bipolar devices, featuring high output drive, fast rise and fall times, and low startup current.

· Undervoltage lockout circuitry varies by version, with operational ranges from 7.6V to 20V.

· Reduced startup and operating currents compared to bipolar UC384x devices.

· Available in 14-pin plastic DIP and SOIC packages, with 8-pin devices for compact applications.

FEATURES

· Fast 20ns output rise and 15ns output fall times.

· Operates in a temperature range of -40°C to +85°C.

· High-performance, low-power BiCMOS process.

· Ultralow start-up current (50 µA typical) and low operating current (4mA typical).

· High output drive with 1A peak current, CMOS outputs with rail-to-rail swing.

· Current-mode operation up to 500kHz, trimmed 5V bandgap reference, and trimmed oscillator discharge current.

· UVLO with hysteresis and low cross-conduction currents.

APPLICATIONS

· Current-mode, off-line, switched-mode power supplies.

· Current-mode, dc-to-dc converters.

· Step-down "buck" regulators and step-up "boost" regulators.

· Flyback, isolated regulators and forward converters.

· Synchronous FET converters.