Datenblatt-Suchmaschine für elektronische Bauteile |
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E-L4971 Datenblatt(PDF) 1 Page - STMicroelectronics |
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E-L4971 Datenblatt(HTML) 1 Page - STMicroelectronics |
1 / 13 page 1/13 L4971 May 2005 1 FEATURES ■ UP TO 1.5A STEP DOWN CONVERTER ■ OPERATING INPUT VOLTAGE FROM 8V TO 55V ■ PRECISE 3.3V (±1%) INTERNAL REFERENCE VOLTAGE ■ OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V ■ SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz ■ VOLTAGE FEEDFORWARD ■ ZERO LOAD CURRENT OPERATION ■ INTERNAL CURRENT LIMITING (PULSE- BYPULSE AND HICCUP MODE) ■ INHIBIT FOR ZERO CURRENT CONSUMPTION ■ PROTECTION AGAINST FEEDBACK DISCONNECTION ■ THERMAL SHUTDOWN ■ SOFT START FUNCTION 2 DESCRIPTION The L4971 is a step down monolithic power switching regulator delivering 1.5A at a voltage be- tween 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25 Ω) to obtain very high efficency and high switching speed. A switching frequency up to 300KHz is 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 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 feed- back loop disconnection, inhibit for zero current consumption and thermal shutdown. The device is available in plastic dual in line, DIP8 for standard assembly, and SO16W for SMD as- sembly. 1.5A STEP DOWN SWITCHING REGULATOR Rev. 11 Figure 1. Package Table 1. Order Codes Part Number Package L4971 DIP8 L4971D SO16W L4971D013TR SO16 in Tape & Reel SO16W DIP8 Figure 1. Block Diagram D97IN748A 5 2 8 4 1 L4971 C1 220 µF 63V C8 330 µF VO=3.3V/1.5A Vi=8V to 55V R1 20K C2 2.7nF R2 9.1K C4 22nF 3 7 L1 126 µH (77120) 6 D1 STPS 3L60U C5 100nF C7 220nF C6 100nF |
Ähnliche Teilenummer - E-L4971 |
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Ähnliche Beschreibung - E-L4971 |
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