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.
   
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