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Fairchild Semiconductor - High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

Numéro de référence FAN5056MV85
Description High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FAN5056MV85 fiche technique
www.fairchildsemi.com
FAN5056MV85
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 Droopup 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
• 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
Block Diagram
Description
The FAN5056 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
FAN5056 features remote voltage sensing, independently
adjustable current limit, and a proprietary wide-range Pro-
grammable Active Droopfor optimal converter transient
response and VRM8.5 compliance. The FAN5056 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
FAN5056 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
FAN5056 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 FAN5056 also offers integrated functions
+3.3V
+1.2V/Adj
9+
-
10
VCCP
11 +
-
12
+2.5V
OSC
REF
PWRGD,
OCL
REF
PWRGD,
OCL
+5V
VCCA 21
-
+
OCL
-
+
-
+
19
RD
+12V
18
RS
20
24 VCCP
1 HIDRV
+5V
15
14
13
3.3/1.5V
V
PWRGD, OCL
-
+
5-Bit
DAC
1.24V
Reference
-
+
Digital
Control
Power
Good
2
23 LODRV
22
GNDP
17
PWRGD
VCC
8 765 4
VID0VID2 VID4
VID1 VID3
3
GNDA
16
ENABLE/SS
Pentium is a registered trademark of Intel Corporation. Programmable Active Droop is a trademark of Fairchild Semiconductor.
REV. 1.0.6 6/26/01

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