IMP38HC4 Datasheet | IMP Inc

Features N N N N N N N N N N N 384x Series Pinout with Bi CMOS Technology Zero Cross-Conduction Current by Design 1MHz Operation 65ns Maximum Current-Sense Delay 120µA Maximum Start-Up Current 1.5m A 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 - 1MHz Operation - No Cross-Conduction Current - 50ns Current-Sense Delay The IMP38C4x and IMP38HC4x are fixed frequency, high performance, current-mode PWM controllers that are pin patible with bipolar 384x devices but feature improvements resulting from IMP’s Bi CMOS 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. Under-voltage lockout (UVL) performance has been improved. When the power supply voltage is below the startup voltage, internal circuitry puts the output into a low impedance state. The output will sink 20m A and remain below 1.3V, well below the turn-on threshold voltage of the external MOSFET. Even when VDD drops to zero volts, the out pin will not rise above approximately 1.3V because the output UVLO circuit is Block Diagrams VDD 7 (12) (11) VD + VREF 8 (14) 5V Reference UVLO - + - RTCT P FB 4 (7) 1 (1) T 2 (3) Q Oscillator 6 (10) OUT - EA 2R - 1V R P + + - 2.5V Ref + (8) PGND ( ) Pins Are 14-Pin Devices Only GND 5 AGND (9) 3 (5) ISNS Connection Notes IMP38C4X, IMP38HC4X (8-Pin Devices) 50% Maximum...