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FAN5071 Datasheet

  • FAN5071

  • High Performance Programmable Synchronous DC-DC Controller f...

  • 425.60KB

  • 15頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN5071
High Performance Programmable Synchronous
DC-DC Controller for Multi-Voltage Platforms
Features
鈥?Output programmable in 25mV steps from 1.05V to
1.825V using a dynamically programmable integrated
5-bit DAC
鈥?Controls adjustable linears for Vclock (2.5V),
Vnorthbridge (1.8V) or Vagp (selectable 1.5V/3.3V), and
Vadj (1.2V nominal)
鈥?Remote sense
鈥?Programmable Active Droop
鈩?/div>
up to 200mV
鈥?Drives N-Channel MOSFETs
鈥?Overcurrent protection using MOSFET sensing
鈥?Overvoltage protection including startup
鈥?85% ef鏗乧iency typical at full load
鈥?Integrated Power Good and Enable/Soft Start functions
鈥?Linears start instantly
鈥?Meets Intel VRM8.5 speci鏗乧ations using minimum
number of external components
鈥?24 pin SOIC package
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
鈩?/div>
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
ef鏗乧iency over the entire speci鏗乪d 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
Applications
鈥?Power supply for Pentium
廬
III Platforms
鈥?VRM for Pentium III processor
鈥?Programmable multi-output power supply
Block Diagram
+3.3V
+5V
VCCA 21
+1.2V/Adj
9
10
VCCP
11
+
-
+
-
REF
PWRGD,
OCL
OCL
REF
+12V
PWRGD,
OCL
OSC
-
+
15
14
13
3.3/1.5V
5-Bit
DAC
1.24V
Reference
Power
Good
3
GNDA
16
ENABLE/SS
-
+
-
+
18
R
S
20
24 VCCP
1 HIDRV
+5V
-
+
19
R
D
12
+2.5V
Digital
Control
2
VCC
V
PWRGD, OCL
-
+
23 LODRV
22
GNDP
17
PWRGD
8 7 65 4
VID0 VID2 VID4
VID1 VID3
Pentium is a registered trademark of Intel Corporation. Programmable Active Droop is a trademark of Fairchild Semiconductor.
REV. 1.0.4 1/29/02

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