ADP3153 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADP3153 Datasheet PDF : 12 Pages
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FEATURES
5-Bit Digitally Programmable 1.8 V to 3.5 V Output
Voltage
Dual N-Channel Synchronous Driver
Total Output Accuracy ؎1% (0؇C to +70؇C)
High Efficiency
Current-Mode Operation
Short Circuit Protection
Power Good Output
Overvoltage Protection Crowbar
On-Board Linear Regulator Controller
VRM 8.2 Compatible
Narrow Body TSSOP 20-Lead Package
APPLICATIONS
Desktop PC Power Supply for:
Pentium II Processor
Deschutes Processor
Pentium Pro Processor
Pentium Processor
AMD–K6 Processor
VRM Modules
5-Bit Programmable Dual
Power Supply Controller
for Pentium® II Processor
ADP3153
GENERAL DESCRIPTION
The ADP3153 is a highly efficient synchronous switching regu-
lator controller and a linear regulator controller. The switching
regulator controller is optimized for Pentium II and Deschutes
Processor applications where 5 V is stepped down to a digitally
controlled output voltage between 1.8 V and 3.5 V. Using a 5-bit
DAC to read a voltage identification (VID) code directly from
the processor, the ADP3153 uses a current mode constant off-
time architecture to generate its precise output voltage.
The ADP3153 drives two N-channel MOSFETS in a synchro-
nous rectified buck converter, at a maximum switching fre-
quency of 250 kHz. Using the recommended loop compensation
and guidelines, the ADP3153 provides a dc/dc converter that
meets Intel’s stringent transient specifications with a minimum
number of output capacitors and smallest footprint. Addition-
ally, the current mode architecture also provides guaranteed
short circuit protection and adjustable current limiting.
The ADP3153’s linear regulator controller drives an external
N-channel device. The output voltage is set by the ratio of the
external feedback resistors. The controller has been designed for
excellent load transient response.
VCC
VIN
+12V
+5V
VO2
+3.3V
1A
R1
VIN
+5V
R2
IRL2703
1000F
35k⍀
20k⍀
22F 1F
CCOMP
SD VCC
DRIVE1
CMP
ADP3153
VLDO
SENSE+
SENSE–
IRL3103
1nF
150pF
FB
DRIVE2
CT
PGND
AGND
VID0–VID4
IRL3103
+ CIN
L
2.5H
RSENSE
7m⍀
10BQ015
+ CO
VO
1.8V–3.5V
14A
5-BIT CODE
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 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
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