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ADP3157

更新时间： 2024-11-28 22:47:35
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
12页 174K
描述
5-Bit Programmable Synchronous Controller for Pentium III Processors

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ADP3157 数据手册

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5-Bit Programmable Synchronous  
®
a
Controller for Pentium III Processors  
ADP3157  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Active Voltage Positioning with Gain and Offset  
Adjustment  
AGND  
V
DRIVE1 DRIVE2 PGND  
SENSE+ SENSE–  
PWRGD  
CC  
Optimal Compensation for Superior Load Transient  
Response  
DELAY  
+15%  
VRM 8.2, VRM 8.3 and VRM 8.4 Compliant  
5-Bit Digitally Programmable 1.3 V to 3.5 V Output  
Dual N-Channel Synchronous Driver  
Total Output Accuracy ؎1% Over Temperature  
High Efficiency, Current-Mode Operation  
Short Circuit Protection  
Overvoltage Protection Crowbar Protects Microprocessors  
with No Additional External Components  
Power Good Output  
NONOVERLAP  
V
DRIVE  
REF  
SD  
2R  
CROWBAR  
IN  
V
+5% V  
–5%  
REF  
REF  
CMPI  
V
T1  
S
Q
R
R
V
REF  
g
m
V
T2  
SO-16 Package  
REFERENCE  
APPLICATIONS  
C
T
1.20V  
CMPT  
Desktop PC Power Supplies for:  
Pentium II and Pentium III Processor Families  
AMD-K6 Processors  
VID0  
VID1  
VID2  
VID3  
VID4  
OFF-TIME  
CONTROL  
SENSE–  
VRM Modules  
GENERAL DESCRIPTION  
ADP3157  
The ADP3157 is a highly efficient synchronous buck switching  
regulator controller optimized for converting the 5 V main sup-  
ply into the core supply voltage required by the Pentium III and  
other high performance processors. The ADP3157 uses an  
internal 5-bit DAC to read a voltage identification (VID) code  
directly from the processor, which is used to set the output  
voltage between 1.3 V and 3.5 V. The ADP3157 uses a current  
mode, constant off-time architecture to drive two external N-  
channel MOSFETs at a programmable switching frequency that  
can be optimized for size and efficiency. It also uses a unique  
supplemental regulation technique called active voltage position-  
ing to enhance load transient performance.  
DAC  
CMP  
V
+12V  
CC  
CC  
V
+5V  
IN  
C
+
IN  
22␮F  
1␮F  
V
DRIVE1  
SD  
L
RSENSE  
V
O
R1  
R2  
1.3V TO  
ADP3157  
SENSE+  
3.5V  
+
C
O
CMP  
1nF  
Active voltage positioning results in a dc/dc converter that meets  
the stringent output voltage specifications for Pentium II and  
Pentium III processors, with the minimum number of output  
capacitors and smallest footprint. Unlike voltage-mode and  
standard current-mode architectures, active voltage positioning  
adjusts the output voltage as a function of the load current so that  
it is always optimally positioned for a system transient.  
SENSE–  
DRIVE2  
CCOMP  
C
T
150pF  
AGND  
PGND  
VID0–VID4  
5-BIT CODE  
Figure 1. 5-Bit Code Typical Application  
The ADP3157 provides accurate and reliable short circuit pro-  
tection and adjustable current limiting. It also includes an  
integrated overvoltage crowbar function to protect the micro-  
processor from destruction in case the core supply exceeds the  
nominal programmed voltage by more than 15%.  
Pentium is a registered trademark of Intel Corporation.  
All other trademarks are the property of their respective holders.  
REV. A  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  
1234567...12

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