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L4973V5.1 Datasheet(PDF) 1 Page - STMicroelectronics |
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L4973V5.1 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 27 page  May 2007 Rev 17 1/27 27 L4973 3.5A step down switching regulator Features ■ Up to 3.5A step down converter ■ Operating input voltage from 8V to 55V ■ 3.3V and 5.1V (±1%) fixed output, and adjustable outputs from: – 0.5V to 50V (3.3 type) – 5.1V to 50V (5.1 type) ■ Frequency adjustable up to 300kHz ■ Voltage feed forward ■ Zero load current operation (min 1mA) ■ Internal current limiting (pulse by pulse and HICCUP mode) ■ Precise 5.1V (1.5%) reference voltage externally available ■ Input/output synchronization function ■ Inhibit for zero current consumption (100mA typ. at VCC = 24V) ■ Protection against feedback disconnection ■ Thermal shutdown ■ Output over voltage protection ■ Soft start function 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 uses an internal power D-MOS transistor (with a typical RDS(on) of 0.15Ω) 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 converter 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, DIP- 18 (12+3+3) for standard assembly, and SO20 (12+4+4) for SMD assembly. DIP-18 (12+3+3) SO-20 (12+4+4) www.st.com Figure 1. Internal schematic diagram L4973 V CC (8V to 55V) CIN C2 ROSC COSC D1 L1 COUT VO(3.3V or 5.1V) CBOOT 4,5,6,10 13,14,15 7 9 8 1 11 3 D97IN554A 17 RCOMP CCOMP CSS 2 16 12 |
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