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FAN5071 数据表(PDF) 1 Page - Fairchild Semiconductor

部件名 FAN5071
功能描述  High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms
Download  15 Pages
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

FAN5071 数据表(HTML) 1 Page - Fairchild Semiconductor

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www.fairchildsemi.com
Pentium is a registered trademark of Intel Corporation. Programmable Active Droop is a trademark of Fairchild Semiconductor.
REV. 1.0.4 1/29/02
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
• 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 Droopfor 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
VID3
VID2
VID1
16
VID0
GNDP
23
22
2
18
24
1
17
-
+
-
+
OSC
1.24V
Reference
Digital
Control
Power
Good
5-Bit
DAC
VID4
87 6 5 4
+5V
+12V
PWRGD
-
+
ENABLE/SS
VCC
GNDA
3
LODRV
HIDRV
VCCP
21
VCCA
+5V
20
-
REF
REF
PWRGD,
OCL
PWRGD,
OCL
+3.3V
+1.2V/Adj
10
9
+2.5V
12
11
19
OCL
-
+
VCCP
PWRGD, OCL
V
3.3/1.5V
15
14
13
RD
RS
-
+
+
-
+
FAN5071
High Performance Programmable Synchronous
DC-DC Controller for Multi-Voltage Platforms


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