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.

– 1MHz Operation

– No Cross-Conduction Current

– 50ns Current-Sense Delay

Key Features

◆ 384x Series Pinout with BiCMOS Technology

◆ Zero Cross-Conduction Current by Design

◆ 1MHz Operation

◆ 65ns Maximum Current-Sense Delay

◆ 120µA Maximum Start-Up Current

◆ 1.5mA Maximum Operating Current

◆ High Output Current Drive

– 1.0A, IMP38HC4x

– 0.5A, IMP38C4x

◆ 20V Maximum Supply Voltage

◆ 2.5V, 1%, Trimmed Error Amplifier Reference

◆ Trimmed Oscillator Discharge Current

◆ Pin-for-Pin Enhanced Replacements for Micrel

MIC38C/HC4x and GMT38C4x/HC4x