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LM5642 - High Voltage/ Dual Synchronous Buck Converter

Description

The LM5642 consists of two current mode synchronous buck regulator controllers operating 180˚ out of phase with each other at a normal switching frequency of 200kHz.

Out of phase operation reduces the input ripple RMS current, thereby significantly reducing the required input capacitance.

Features

  • analog soft-start circuitry that is independent of the output load and output capacitance making the soft-start behavior more predictable and controllable than traditional soft-start circuits. Over-voltage protection is available for both outputs. A UVDelay pin is also available to allow delayed shut off time for the IC during an output under-voltage event. Features n Two synchronous buck regulators n 180˚ out of phase operation n Synchronizable switching frequency from 150kHz to 250kHz n 4.5V.

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Datasheet Details

Part number LM5642
Manufacturer National Semiconductor
File Size 667.79 KB
Description High Voltage/ Dual Synchronous Buck Converter
Datasheet download datasheet LM5642 Datasheet
Additional preview pages of the LM5642 datasheet.

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Full PDF Text Transcription

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LM5642 High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization September 2003 LM5642 High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization General Description The LM5642 consists of two current mode synchronous buck regulator controllers operating 180˚ out of phase with each other at a normal switching frequency of 200kHz. Out of phase operation reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The switching frequency can be synchronized to an external clock between 150kHz and 250kHz. The two switching regulator outputs can also be paralleled to operate as a dual-phase single output regulator. The output of each channel can be independently adjusted from 1.3 to 90% of Vin.
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