LM2642 - Two-Phase Synchronous Step-Down Switching Controller

Product Overview

National Semiconductor

Part number	LM2642
Manufacturer	National Semiconductor
File Size	643.89 KB
Description	Two-Phase Synchronous Step-Down Switching Controller
Datasheet	LM2642 Datasheet
Additional preview pages of the LM2642 datasheet.

The LM2642 consists of two current mode synchronous buck regulator controllers with a switching frequency of 300kHz.

The two switching regulator controllers operate 180˚ out of phase.

This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance.

analog soft-start circuitry that is independent of the output load and output capacitance. This makes the soft-start behavior more predictable and controllable than traditional soft-start circuits. A PGOOD1 pin is provided to monitor the dc output of channel 1. Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event. Features n n n n n n n n n n n n n n n n Two synchronous buck regulat.

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Published: Mar 22, 2005 |