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ML4903

Micro Linear
Part Number ML4903
Manufacturer Micro Linear
Description High Current Synchronous Buck Controller
Published May 7, 2005
Detailed Description July 1999 ML4903 High Current Synchronous Buck Controller GENERAL DESCRIPTION The ML4903 high current synchronous buck ...
Datasheet PDF File ML4903 PDF File

ML4903
ML4903

Overview
July 1999 ML4903 High Current Synchronous Buck Controller GENERAL DESCRIPTION The ML4903 high current synchronous buck controller provides high efficiency DC/DC conversion to generate VCCP for processors such as the Pentium® Pro and Pentium II from Intel®.
The ML4903 controller, when combined with two external MOSFETs, generates output voltages between 1.
8V and 3.
5V from a 12V supply.
The output voltage is selected via an internal 2 chord 4-bit DAC.
In the upper range, the output can be set between 2.
1V and 3.
5V in 100mV steps.
In the lower range, the output can be set between 1.
8V and 2.
05V in 50mV steps.
Output currents in excess of 20A can be attained at efficiencies greater than 80%.
The ML4903 can be enabled/disabled via the SHDN pin.
While disabled, the output of the regulator is completely isolated from the circuit’s input supply.
The ML4903 employs fixed-frequency PWM control combined with a sophisticated control loop enhancement circuit to provide excellent load transient res...


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