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LM5642 - High Voltage/ Dual Synchronous Buck Converter

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.

Key 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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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.