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
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.
Current-mode feedback control assures excellent line and load regulation and a wide loop
bandwidth for excellent response to fast load transients. Current is sensed across either the Vds
of the top FET or across an external current-sense resistor connected in series with the drain of
the top FET. Current limit is independently adjustable for each channel.
The LM2642 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.
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