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ADP3156JR-18

更新时间： 2024-01-21 18:08:21
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亚德诺 - ADI 控制器
页数 文件大小 规格书
12页 189K
描述
Dual Power Supply Controller for Desktop Systems

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ADP3156JR-18 数据手册

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Dual Power Supply Controller  
for Desktop Systems  
a
ADP3156  
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%  
Fixed 1.5 V, 1.8 V and 2.5 V Output Versions  
Dual N-Channel Synchronous Driver  
On-Board Linear Regulator Controller  
Total Output Accuracy ؎1% Over Temperature  
High Efficiency, Current-Mode Operation  
Short Circuit Protection  
NONOVERLAP  
V
DRIVE  
REF  
SD  
2R  
CROWBAR  
OFF  
IN  
V
+5% V  
–5%  
REF  
REF  
CMPI  
Overvoltage Protection Crowbar Protects Loads with  
No Additional External Components  
Power Good Output  
V
T1  
S
Q
R
R
V
REF  
g
SO-16 Package  
m
V
T2  
REFERENCE  
APPLICATIONS  
V
LDO  
C
T
Desktop Computer Supplies  
ACPI-Compliant Power Systems  
General Purpose DC-DC Converters  
CMPT  
1.20V  
FB  
V
OFF-TIME  
CONTROL  
IN  
ADP3156  
SENSE–  
GENERAL DESCRIPTION  
The ADP3156 is a highly efficient synchronous buck switching  
regulator controller optimized for converting the 3.3 V or 5 V  
main supply into lower supply voltages required on the mother-  
boards of Pentium® III and other high performance processor  
systems. The ADP3156 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 positioning to enhance load  
transient performance. Active voltage positioning results in a  
DC/DC converter that provides the best possible transient re-  
sponse using 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.  
CMP  
The ADP3156 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  
C
+
IN  
22␮F  
1␮F  
R1  
V
CC  
SD  
DRIVE1  
V
LDO  
L
RSENSE  
V
V
O2  
ADP3156  
SENSE+  
O
35k⍀  
+
The ADP3156 provides accurate and reliable short circuit  
protection 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%.  
1000␮F  
FB  
C
O
1nF  
20k⍀  
CMP  
SENSE–  
DRIVE2  
R2  
CCOMP  
C
T
200pF  
AGND PGND  
Figure 1. Typical Application  
Pentium is a registered trademark of Intel Corporation.  
All other trademarks are the property of their respective holders.  
REV. 0  
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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