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ADP3154

更新时间： 2024-11-28 22:39:03
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亚德诺 - ADI 控制器
页数 文件大小 规格书
12页 190K
描述
5-Bit Programmable Dual Power Supply Controller for Pentium III Processors

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ADP3154 数据手册

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5-Bit Programmable Dual Power Supply  
®
a
Controller for Pentium III Processors  
ADP3154  
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%  
NONOVERLAP  
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  
Onboard Linear Regulator Controller  
Total Output Accuracy ؎1% Over Temperature  
High Efficiency, Current-Mode Operation  
Short Circuit Protection  
Overvoltage Protection Crowbar Protects  
Microprocessors with No Additional External  
Components  
V
DRIVE  
REF  
SD  
2R  
CROWBAR  
OFF  
IN  
V
+5% V  
–5%  
REF  
REF  
CMPI  
V
T1  
S
Q
R
R
V
REF  
g
m
V
T2  
REFERENCE  
Power Good Output  
TSSOP-20 Package  
VLDO  
FB  
C
T
CMPT  
1.20V  
V
APPLICATIONS  
OFF-TIME  
CONTROL  
IN  
VID0  
VID1  
VID2  
VID3  
VID4  
SENSE–  
Desktop PC Power Supplies for:  
Pentium II and Pentium III Processor Families  
AMD-K6 Processors  
VRM Modules  
ADP3154  
GENERAL DESCRIPTION  
The ADP3154 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 ADP3154 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 ADP3154 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  
The ADP3154 contains a linear regulator controller that is  
designed to drive an external N-channel MOSFET. This linear  
regulator is used to generate the auxiliary voltages (AGP, GTL,  
etc.) required in most motherboard designs, and has been de-  
signed to provide a high bandwidth load-transient response. A  
pair of external feedback resistors sets the linear regulator out-  
put voltage.  
V
+12V  
CC  
V
+5V  
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 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.  
C
+
IN  
22␮F  
1␮F  
R1  
V
CC  
SD  
DRIVE1  
VLDO  
L
V
RSENSE  
O
V
1.3V TO  
O2  
ADP3154  
3.5V  
35k⍀  
+
SENSE+  
1000␮F  
FB  
C
O
1nF  
20k⍀  
CMP  
SENSE–  
DRIVE2  
The ADP3154 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%.  
R2  
CCOMP  
C
T
200pF  
AGND PGND  
VID0–VID4  
5-BIT CODE  
Pentium is a registered trademark of Intel Corporation.  
All other trademarks are the property of their respective holders.  
Figure 1. Typical Application  
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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