L4971D Datasheet

DC/DC Switching Regulators


The L4971D is a step down monolithic powerswitching regulator delivering 1.5A at a voltage between3.3V and 50V (selected by a simple externaldivider). Realized in BCD mixed technology, thedevice uses an internal power D-MOS transistor(with a typical Rdson of 0.25Ω) to obtain very highefficency and high switching speed.A switching frequency up to 300KHz is achievable(the maximum power dissipation of the packagesmust be observed).A wide input voltage range between 8V to 55V andoutput voltages regulated from 3.3V to 50V coverthe majority of today’s applications.Features of this new generations of DC-DC converterinclude pulse-by-pulse current limit, hiccupmode for short circuit protection, voltage feedforwardregulation, soft-start, protection against feedbackloop disconnection, inhibit for zero currentconsumption and thermal shutdown.The device is available in plastic dual in line, DIP8for standard assembly, and SO16W for SMD assembly. L4971D Features • UP TO 1.5A STEP DOWN CONVERTER• OPERATING INPUT VOLTAGE FROM 8V TO55V• PRECISE 3.3V (±1%) INTERNALREFERENCE VOLTAGE• OUTPUT VOLTAGE ADJUSTABLE FROM3.3V TO 50V• SWITCHING FREQUENCY ADJUSTABLE UPTO 300KHz• VOLTAGE FEEDFORWARD• ZERO LOAD CURRENT OPERATION• INTERNAL CURRENT LIMITING (PULSEBYPULSEAND HICCUP MODE)• INHIBIT FOR ZERO CURRENTCONSUMPTION• PROTECTION AGAINST FEEDBACKDISCONNECTION• THERMAL SHUTDOWN• SOFT START FUNCTION


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Manufacturer information

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