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ADP3155JRU

更新时间： 2024-11-28 22:34:39
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
14页 202K
描述
5-Bit Programmable Triple Power Supply Controller for Pentium III Processors

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ADP3155JRU 数据手册

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5-Bit Programmable Triple Power Supply  
Controller for Pentium® III Processors  
a
ADP3155  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Active Voltage Positioning with Gain and Offset  
Adjustment  
V
DRIVE1 DRIVE2 PGND AGND PWRGD SENSE+ SENSE–  
CC  
Optimal Compensation for Superior Load Transient  
Response  
NONOVERLAP  
DRIVE  
DELAY  
V
REF  
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  
Two Onboard Linear Regulator Controllers  
Total Output Accuracy ؎1% Over Temperature  
High Efficiency, Current-Mode Operation  
Short Circuit Protection  
Overvoltage Protection Crowbar Protects Micro-  
processors, with No Additional External Components  
Power Good Output  
SD  
+15%  
2R  
CROWBAR  
IN  
OFF  
V
V
REF  
REF  
CMPI  
+5%  
–5%  
V
T1  
S
Q
R
V
REF  
R
g
m
V
T2  
REFERENCE  
C
T
TSSOP-20 Package  
CMPT  
APPLICATIONS  
V
VLDO2  
FB2  
OFF-TIME  
CONTROL  
IN  
SENSE–  
Desktop PC Power Supplies for:  
Pentium II and Pentium III Processor Families  
AMD-K6 Processors  
CMP  
VLDO1  
FB1  
VRM Modules  
ADP3155  
DAC  
GENERAL DESCRIPTION  
1.20V  
The ADP3155 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 ADP3155 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 ADP3155 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.  
VID4  
VID1 VID0  
VID3 VID2  
The ADP3155 contains two linear regulator controllers that are  
designed to drive external N-channel MOSFETs. These linear  
regulators are used to generate the auxiliary voltages (AGP,  
GTL, etc.) required in most motherboard designs, and have  
been designed to provide a high bandwidth load-transient re-  
sponse. A pair of external feedback resistors sets each linear  
regulator output voltage.  
V
+12V  
V
+5V  
CC  
IN  
C
IN  
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 the 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.  
+
22␮F  
1␮F  
V
CC  
R1  
R2  
SD  
Q1  
DRIVE1  
CMP  
L
RSENSE  
V
O
V
INLDO1  
CCOMP  
1.3V TO  
ADP3155  
SENSE+  
LDO1  
3.5V  
+
Q
LDO1  
C
O
V
1nF  
V
SENSE–  
OLDO1  
R3  
1␮F  
FB1  
The ADP3155 provides accurate and reliable short circuit pro-  
tection and adjustable current limiting. It also includes an inte-  
grated overvoltage crowbar function to protect the microprocessor  
from destruction in case the core supply exceeds the nominal  
programmed voltage by more than 15%.  
Q2  
DRIVE2  
PGND  
R4  
20k⍀  
V
INLDO2  
Q
LDO2  
V
LDO2  
V
OLDO2  
150pF  
R5  
C
T
FB2  
1␮F  
AGND  
R6  
20k⍀  
VID0–VID4  
Pentium is a registered trademark of Intel Corporation.  
All other trademarks are the property of their respective holders.  
5-BIT CODE  
REV. A  
Figure 1. Typical Application  
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...14

中文翻译

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ADP3155JRU 替代型号

型号 品牌 替代类型 描述 数据表
ADP3155JRU-REEL7 ADI

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