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參數(shù)資料
| 型號： | ADP3156 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual Power Supply Controller for Desktop Systems |
| 中文描述： | 雙電源控制器桌面系統(tǒng) |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 186K |
| 代理商： | ADP3156 |
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.
a
ADP3156
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1999
Dual Power Supply Controller
for Desktop Systems
FUNCTIONAL BLOCK DIAGRAM
CMPI
V
T1
V
REF
+5% V
REF
–5%
DELAY
V
REF
+15%
PWRGD
SENSE+
CROWBAR
OFF
IN
NONOVERLAP
DRIVE
Q
S
R
DRIVE1 DRIVE2 PGND
2R
SENSE–
V
REF
V
CC
SD
V
LDO
V
T2
CMPT
C
T
g
m
R
REFERENCE
OFF-TIME
CONTROL
V
IN
SENSE–
1.20V
CMP
FB
ADP3156
AGND
FEATURES
Active Voltage Positioning with Gain and Offset
Adjustment
Optimal Compensation for Superior Load Transient
Response
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
6
1% Over Temperature
High Efficiency, Current-Mode Operation
Short Circuit Protection
Overvoltage Protection Crowbar Protects Loads with
No Additional External Components
Power Good Output
SO-16 Package
APPLICATIONS
Desktop Computer Supplies
ACPI-Compliant Power Systems
General Purpose DC-DC Converters
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.
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%.
Pentium is a registered trademark of Intel Corporation.
All other trademarks are the property of their respective holders.
V
CC
+12V
1
m
F
22
m
F
V
IN
+5V
+
C
IN
L
+C
O
V
O
R
SENSE
1nF
C
COMP
35k
V
20k
V
V
O2
1000
m
F
R1
200pF
V
CC
DRIVE1
SD
SENSE+
SENSE–
DRIVE2
PGND
AGND
C
T
CMP
ADP3156
FB
V
LDO
R2
Figure 1. Typical Application
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3156JR-1.5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADP3156JR-1.5-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ADP3156JR-1.8 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADP3156JR-1.8-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ADP3156JR-15 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Power Supply Controller for Desktop Systems |
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