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ADP3170 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADP3170
Description  VRM 8.5 Compatible Single Phase Core Controller
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP3170 Datasheet(HTML) 1 Page - Analog Devices

 
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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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
ADP3170
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
VRM 8.5 Compatible
Single Phase Core Controller
FUNCTIONAL BLOCK DIAGRAM
OSCILLATOR
PWM
LOGIC
SET
RESET
CROWBAR
3.0V
REFERENCE
1.8V
DAC +20%
DAC –20%
CMP
gm
REF
VID
DAC
REF
VID25
VID0
VID1
VID2
VID3
UVLO
AND BIAS
SD
DRVH
VCC
GND
REF
LRFB
LRDRV
COMP
DRVL
PGND
PWRGD
CS–
CS+
FB
CT
ADP3170
FEATURES
Optimally Compensated Active Voltage Positioning
with Gain and Offset Adjustment (ADOPT™) for
Superior Load Transient Response
Complies with VRM 8.5 Specifications with Lowest
System Cost
5-Bit Digitally Programmable 1.05 V to 1.825 V Output
N-Channel Synchronous Buck Controller
Onboard 1.8 V Linear Regulator Controller
Total Accuracy
1% Over Temperature
High Efficiency Current-Mode Operation
Short Circuit Protection
Power Good Output
Overvoltage Protection Crowbar Protects
Microprocessors with No Additional External
Components
APPLICATIONS
Core and 1.8 V Standby Supplies for Next Generation
Intel Pentium® III Processors
GENERAL DESCRIPTION
The ADP3170 is a highly efficient output synchronous buck
switching regulator controller optimized for converting a 5 V
main supply into the core supply voltage required by next
generation Intel Celeron processors. The ADP3170 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 1.05 V and 1.825 V. The ADP3170
uses a current mode, constant off-time architecture to drive two
N-channel MOSFETs at a programmable switching frequency
that can be optimized for regulator size and efficiency.
The ADP3170 also uses a unique supplemental regulation tech-
nique called Analog Devices Optimal Positioning Technology
(ADOPT) to enhance load transient performance. Active
voltage positioning results in a dc/dc converter that meets the
stringent output voltage specifications for high performance
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 ADP3170 also
provides accurate and reliable short circuit protection and
adjustable current limiting. It also includes an integrated
overvoltage crowbar function to protect the microprocessor
from destruction in case the core supply exceeds the nominal
programmed voltage by more than 20%.
The ADP3170 contains a 1.8 V linear regulator controller that
is designed to drive an external N-channel MOSFET. This linear
regulator can be used to generate auxiliary voltages (such as 1.8 V
standby power) required in most motherboard designs, and has
been designed to provide a high bandwidth load-transient response.
The ADP3170 is specified over the commercial temperature range
of 0
°C to 70°C and is available in a 20-lead TSSOP package.
ADOPT is a trademark of Analog Devices, Inc.
Pentium is a registered trademark of Intel Corporation


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