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LM2642 - Two-Phase Synchronous Step-Down Switching Controller

General Description

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.

Key Features

  • 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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LM2642 Two-Phase Synchronous Step-Down Switching Controller May 2003 LM2642 Two-Phase Synchronous Step-Down Switching Controller General Description 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. 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 VIN • maximum duty cycle. An internal 5V rail is also available externally for driving bootstrap circuitry.