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L4978 Datasheet(PDF) 1 Page - STMicroelectronics |
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L4978 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 12 page  UP TO 2A STEP DOWN CONVERTER OPERATING INPUT VOLTAGE FROM 8V TO 55V PRECISE 3.3V ( ±1%) INTERNAL REFER- ENCE VOLTAGE OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V SWITCHING FREQUENCY ADJUSTABLE UP TO 500KHz VOLTAGE FEEDFORWARD ZERO LOAD CURRENT OPERATION INTERNAL CURRENT LIMITING (PULSE-BY- PULSE AND HICCUP MODE) INHIBIT FOR ZERO CURRENT CONSUMP- TION PROTECTION AGAINST FEEDBACK DIS- CONNECTION THERMAL SHUTDOWN SOFT START FUNCTION DESCRIPTION The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage be- tween 3.3V and 50V (selected by a simple exter- nal divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transis- tor (with a typical Rdson of 0.25 Ω) to obtain very high efficency and high switching speed. A switching frequency up to 500KHz is achiev- able (the maximum power dissipation of the pack- ages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications. Features of this new generations of DC-DC con- verter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedfor- ward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero cur- rent consumption and thermal shutdown. The device is available in plastic dual in line, MINIDIP 8 for standard assembly, and SO16W for SMD assembly. May 2000 ® ORDERING NUMBERS: L4978 (Minidip) L4978D (SO16) L4978 2A STEP DOWN SWITCHING REGULATOR Minidip SO16W D98IN837A 5 2 8 4 1 L4978 C1 220 µF 63V C8 330 µF VO=3.3V/2A Vi=8V to 55V R1 20K C2 2.7nF R2 9.1K C4 22nF 3 7 L1 126 µH (77120) 6 D1 GI SB560 C5 100nF C7 220nF C6 100nF TYPICAL APPLICATION CIRCUIT 1/12 |
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