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ML4901

Micro Linear
Part Number ML4901
Manufacturer Micro Linear
Description High Current Synchronous Buck Controller
Published May 7, 2005
Detailed Description April 1997 PRELIMINARY ML4901 High Current Synchronous Buck Controller GENERAL DESCRIPTION The ML4901 high current sync...
Datasheet PDF File ML4901 PDF File

ML4901
ML4901

Overview
April 1997 PRELIMINARY ML4901 High Current Synchronous Buck Controller GENERAL DESCRIPTION The ML4901 high current synchronous buck controller has been designed to provide high efficiency DC/DC conversion for next generation processors such as the Pentium® Pro from Intel®.
The ML4901 controller, when combined with 2 external MOSFETs, generates output voltages between 2.
1V and 3.
5V from a 12V supply.
The output voltage is selected via an internal 4-bit DAC.
Output currents in excess of 14A can be attained at efficiencies greater than 90%.
The ML4901 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 ML4901 employs fixed-frequency PWM control combined with a dual mode control loop to provide excellent load transient response.
FEATURES s Designed to meet Pentium® Pro power supply requirements DC regulation to +1% maximum Proprietary circuitry provides transient response of +5% maximum over 300mA to 14A load range Programmable output voltage (2.
1V to 3.
5V) is set by an onboard 4-bit DAC Synchronous buck topology for maximum power conversion efficiency Fixed frequency operation for easier system integration Integrated antishoot-through logic, short circuit protection, and UV lockout Shutdown control provides load isolation s s s s s s s BLOCK DIAGRAM (Pin Configuration Shown for 16-Pin SOIC Version) 15 VDD + 10.
4V PROTECT 16 – UVLO + – P DRV 14 4.
4V CONTROL LOGIC N DRV 13 35µA + – PWR GND 12 SHDN 5 COMP 200kHz + – 11 D0 1 VFB VDAC -95mV ISENSE 9 D1 2 D2 3 + – 10 D3 4 PWR GOOD 6 4 BIT DAC VDAC + – VDAC + 10% VDAC + 3% VFB VDAC - 10% VDAC - 3% 8 + – VDAC + 3% VFB VDAC - 3% + – + – 3.
5V REFERENCE GND VREF 7 1 ML4901 PIN CONFIGURATION ML4901 16-Pin Narrow SOIC (S16N) D0 D1 D2 D3 SHDN PWR GOOD VREF GND 1 2 3 4 5 6 7 8 TOP VIEW 16 15 14 13 12 11 10 9 PROTECT VDD P DRV N DRV PWR GND COMP ISENSE VFB D0 D1 D2 D3 NC SHDN NC PWR GOOD VREF GND ML...


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