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L4976D013TR中文资料

April 2007Rev 71/17

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 R ds(ON) of 0.25?) 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.

L4976D013TR中文资料

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L4976D013TR中文资料

L4976D013TR中文资料

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