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L4976 Datasheet(PDF) 1 Page - STMicroelectronics |
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L4976 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 17 page  April 2007 Rev 7 1/17 17 L4976 1A step down switching regulator Features ■ Up to 1A step down converter ■ Operating input voltage from 8v to 55v ■ Precise 5.1V reference voltage ■ Output voltage adjustable from 0.5V to 50V ■ Switching frequency adjustable up to 300kHz ■ Voltage feedforward ■ Zero load current operation ■ Internal current limiting (pulse-bypulse ■ and hiccup mode) ■ Protection against feedback disconnection ■ Thermal shutdown Description The L4976 is a step down monolithic power switching regulator delivering 1A at a voltage between 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 Rds(ON) of 0.25Ω) 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 40V cover the majority of today’s applications. Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, protection against feedback loop disconnection and thermal shutdown. The device is available in plastic dual in line, MINIDIP 8 for standard assembly, and SO16W for SMD assembly. DIP8 SO16W www.st.com Figure 1. Typical application circuit 5 2 8 4 1 L4976 C1 220 µF 63V C8 330 µF VO=3.3V/1A Vi=8V to 55V R1 20K C2 2.7nF R2 9.1K C4 22nF 3 7 L1 260 µH (77120) 6 D1 GI SB360 C7 220nF C6 100nF |
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