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FAN5056MV85

更新时间： 2024-11-20 22:40:51
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 控制器
页数 文件大小 规格书
15页 163K
描述
High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms

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中文翻译

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FAN5056MV85 数据手册

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www.fairchildsemi.com  
FAN5056MV85  
High Performance Programmable Synchronous  
DC-DC Controller for Multi-Voltage Platforms  
Features  
Description  
• 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  
• Meets Intel VRM8.5 specifications using minimum  
number of external components  
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 Droop™ for 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  
• 24 pin SOIC package  
Applications  
• Power supply for Pentium® III Platforms  
• VRM for Pentium III processor  
• Programmable multi-output power supply  
Block Diagram  
+3.3V  
+5V  
VCCA 21  
+1.2V/Adj  
19  
-
+
9
+
-
REF  
RD  
PWRGD,  
OCL  
10  
VCCP  
OCL  
11  
12  
+
-
REF  
+12V  
+5V  
PWRGD,  
OCL  
18  
20  
-
+
+2.5V  
RS  
OSC  
-
+
VCCP  
HIDRV  
24  
1
15  
14  
13  
Digital  
2
VCC  
Control  
-
+
V
-
+
23 LODRV  
PWRGD, OCL  
22  
3.3/1.5V  
GNDP  
1.24V  
Reference  
5-Bit  
DAC  
17  
Power  
Good  
PWRGD  
8 7 6 5 4  
3
16  
ENABLE/SS  
VID4  
VID0VID2  
GNDA  
VID1 VID3  
Pentium is a registered trademark of Intel Corporation. Programmable Active Droop is a trademark of Fairchild Semiconductor.  
REV. 1.0.6 6/26/01  
1234567...15

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