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參數資料
| 型號： | ADP3157 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 5-Bit Programmable Synchronous Controller for Pentium III Processors |
| 中文描述： | 5位可編程同步控制器，用于奔騰III處理器 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 173K |
| 代理商： | ADP3157 |
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.
a
ADP3157
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
5-Bit Programmable Synchronous
Controller for Pentium III Processors
FUNCTIONAL BLOCK DIAGRAM
CMPI
VT1
VREF +5% VREF –5%
DELAY
VREF +15%
PWRGD
SENSE+
CROWBAR
IN
NONOVERLAP
DRIVE
Q
S
R
DRIVE1 DRIVE2 PGND
2R
SENSE–
VREF
VCC
SD
VT2
CMPT
CT
gm
R
REFERENCE
DAC
OFF-TIME
CONTROL
SENSE–
1.20V
CMP
VID0
VID2
VID3
VID4
ADP3157
AGND
VID1
FEATURES
Active Voltage Positioning with Gain and Offset
Adjustment
Optimal Compensation for Superior Load Transient
Response
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
SO-16 Package
APPLICATIONS
Desktop PC Power Supplies for:
Pentium II and Pentium III Processor Families
AMD-K6 Processors
VRM Modules
GENERAL DESCRIPTION
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.
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.
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%.
VCC +12V
1 F
22 F
VIN +5V
+
CIN
L
+
CO
VO
1.3V TO
3.5V
RSENSE
1nF
C
COMP
R1
150pF
VCC
SD
DRIVE1
SENSE+
SENSE–
DRIVE2
PGND
AGND
CT
CMP
ADP3157
R2
VID0–VID4
5-BIT CODE
Figure 1. 5-Bit Code Typical Application
Pentium is a registered trademark of Intel Corporation.
All other trademarks are the property of their respective holders.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADP3157J | 制造商:Analog Devices 功能描述: |
| ADP3157JR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADP3157JR-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ADP3158 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Bit Programmable Synchronous Buck Controllers |
| ADP3158JR | 制造商:Rochester Electronics LLC 功能描述:3-BIT PROGRAMMBLE SYNCRO. BUCK CNTRLR. - Bulk |
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