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LM2642

National Semiconductor
Part Number LM2642
Manufacturer National Semiconductor
Description Two-Phase Synchronous Step-Down Switching Controller
Published Mar 22, 2005
Detailed Description LM2642 Two-Phase Synchronous Step-Down Switching Controller May 2003 LM2642 Two-Phase Synchronous Step-Down Switching ...
Datasheet PDF File LM2642 PDF File

LM2642
LM2642

Overview
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.
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 currentsense resistor connected in seri...


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