5-Bit Programmable Dual
Power Supply Controller
for Pentium® II Processor
a
ADP3153
FEATURES
GENERAL DESCRIPTION
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
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.
Overvoltage Protection Crowbar
On-Board Linear Regulator Controller
VRM 8.2 Compatible
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.
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
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.
V
V
CC
IN
+12V
+5V
+
C
22F
1F
IN
R1
V
CC
SD
DRIVE1
L
R
7m⍀
V
+5V
CMP
SENSE
IN
IRL3103
1nF
2.5H
V
O
R2
C
ADP3153
COMP
1.8V–3.5V
14A
SENSE+
+
C
O
IRL2703
VLDO
V
O2
SENSE–
DRIVE2
PGND
+3.3V
1A
35k⍀
20k⍀
1000F
10BQ015
FB
IRL3103
C
T
150pF
AGND
VID0–VID4
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
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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.
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© Analog Devices, Inc., 1998