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L4973V3.3-L4973V5.1 Datasheet(PDF) 2 Page - STMicroelectronics |
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L4973V3.3-L4973V5.1 Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 16 page  uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high effi- ciency 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- 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 consump- tion and thermal shutdown. Packages available are in plastic dual in line, DIP- 18 (12+3+3) for standard assembly, and SO20 (12+4+4) for SMD assembly. PIN CONNECTIONS (Top view) OSC OUT OUT GND GND VCC GND V CC BOOT 1 3 2 4 5 6 7 8 9 INH VFB COMP GND GND GND V5.1 SS SYNC 18 17 16 15 14 12 13 11 10 D94IN162A POWERDIP (12+3+3) OSC OUT OUT GND GND GND GND VCC VCC VFB COMP GND GND GND GND V5.1 SS SYNC 1 3 2 4 5 6 7 8 9 18 17 16 15 14 12 13 11 19 10 20 BOOT INH D94IN163A SO20 (12+4+4) VREF GOOD 5.1V COMP VFB SYNC BOOT DRIVER HICCUP CURRENT LIMITING INTERNAL REFERENCE SS INH ZERO CURRENT INHIBIT D94IN161B + - 3.3V V5.1 E/A SOFT START 5.1V 3.3V THERMAL SHUTDOWN INTERNAL SUPPLY 5.1V - + PWM CURRENT LIMITING R S Q Q CBOOT CHARGE OSCILLATOR OUT OUT GND OSC V CC V CC 17(19) 11(12) 12(13) 18(20) 1(1) 2(2) 3(3) 9(10) 8(9) 7(8) 16(18) 10(11) 4,5,6,13,14,15 (4,5,6,7,14,15,16,17) Pin x = Powerdip Pin (x) = S020 BLOCK DIAGRAM L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 2/16 |
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