L4973D3.3 Datasheet | STMicroelectronics

DESCRIPTION The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device VCC (8V to 55V) ROSC CIN C2 10 12 CBOOT VO(3.3V or 5.1V) L1 1 4,5,6, 13,14,15 16 L4973 9 3 11 2 RP COSC CSS CP D1 COUT D97IN554A April 2000 1/16 L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 40V cover the majority of the today applications. Features of this new generation of DC-DC con PIN CONNECTIONS (Top view) verter includes pulse by pulse current limit, hiccup mode for output short circuit protection, voltage feed forward regulation, soft start, input/output synchronization, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown. Packages available are in plastic dual in line, DIP18 (12+3+3) for standard assembly, and SO20 (12+4+4) for SMD assembly. OSC OUT OUT GND GND GND VCC VCC BOOT 1 2 3 4 5 6 7 8 9 D94IN162A 18 17 16 15 14 13 12 11 10 SYNC SS V5.1 GND GND GND VFB P INH OSC OUT OUT GND GND GND GND VCC VCC BOOT 1 2 3 4 5 6 7 8 9 10 D94IN163A 20 19 18 17 16 15 14 13 12 11 SYNC SS V5.1 GND GND GND GND VFB P INH POWERDIP (12+3+3) SO20 (12+4+4) BLOCK DIAGRAM INH 10(11) V5.1 16(18) VCC 7(8) 8(9) CBOOT CHARGE ZERO CURRENT INHIBIT VREF GOOD INTERNAL REFERENCE INTERNAL SUPPLY 5.1V VCC 5.1V 3.3V 17(19) SOFT...