DESCRIPTION

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

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

· Low startup current and undervoltage lockout circuitry for efficient operation.

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

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 (1A peak current, HC version) with rail-to-rail swing.

· Current-mode operation up to 500kHz with trimmed 5V bandgap reference.

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

· 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.