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The IMP38C4x and IMP38HC4x are fixed frequency, high performance, current-mode PWM controllers that are pin compatible with bipolar 384x devices but feature improvements resulting from IMP¡¯s BiCMOS processing and circuit design. Notable among the improvements are zero cross-conduction/shoot-through current, reduced start-up and operating current, lower current-sense delay, higher frequency operation, full supply voltage swing at the output and a 1 trimmed voltage reference.

IMP38C4x and IMP38HC4x output driver stage has zero cross-conduction current. A proprietary output state-machine monitors each output MOSFET and guarantees by design zero cross-conduction current. This is an industry first for 384x PWM devices.

¨C 1MHz Operation

¨C No Cross-Conduction Current

¨C 50ns Current-Sense Delay

Key Features

¡ô 384x Series Pinout with BiCMOS Technology

¡ô Zero Cross-Conduction Current by Design

¡ô 1MHz Operation

¡ô 65ns Maximum Current-Sense Delay

¡ô 120?A Maximum Start-Up Current

¡ô 1.5mA Maximum Operating Current

¡ô High Output Current Drive

¨C 1.0A, IMP38HC4x

¨C 0.5A, IMP38C4x

¡ô 20V Maximum Supply Voltage

¡ô 2.5V, 1, Trimmed Error Amplifier Reference

¡ô Trimmed Oscillator Discharge Current

¡ô Pin-for-Pin Enhanced Replacements for Micrel

MIC38C/HC4x and GMT38C4x/HC4x