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FAN5071FAIN/a8avaiHigh Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms


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FAN5071
High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

Features
Output programmable in 25mV steps from 1.05V to
1.825V using a dynamically programmable integrated
5-bit DAC Controls adjustable linears for Vclock (2.5V),
Vnorthbridge (1.8V) or Vagp (selectable 1.5V/3.3V), and
Vadj (1.2V nominal) Remote sense Programmable Active Droop
up to 200mV Drives N-Channel MOSFETs Overcurrent protection using MOSFET sensing Overvoltage protection including startup 85% efficiency typical at full load Integrated Power Good and Enable/Soft Start functions Linears start instantly Meets Intel VRM8.5 specifications using minimum
number of external components 24 pin SOIC package
Applications
Power supply for Pentium
III Platforms VRM for Pentium III processor Programmable multi-output power supply
Description

The FAN5071 is a synchronous mode DC-DC controller IC
which provides a highly accurate, programmable set of output
voltages for multi-voltage platforms such as the Intel Pentium III,
and provides a complete solution for all Intel VRM8.5 CPU
applications, and for other high-performance processors. The
FAN5071 features remote voltage sensing, independently
adjustable current limit, and a proprietary wide-range Pro-
grammable Active Droop
for optimal converter transient
response and VRM8.5 compliance. The FAN5071 uses a 5-bit
D/A converter to dynamically program the output voltage dur-
ing operation from 1.05V to 1.825V in 25mV steps. The
FAN5071 uses a high level of integration to deliver load cur-
rents in excess of 28A from a 5V source with minimal exter-
nal circuitry. Synchronous-mode operation offers optimum
efficiency over the entire specified output voltage range. An
on-board precision low TC reference achieves 0.8% voltage
regulation without expensive external components. The
FAN5071 includes linear regulator controllers for Vclock
(2.5V),Vnorthbridge (1.8V) or Vagp (selectable 1.5V/3.3V),
and Vadjustable (1.2V nominal) each adjustable with an
external divider. The FAN5071 also offers integrated functions
including open-collector Power Good, Output Enable/Soft
Block Diagram
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