5-Bit Programmable Synchronous
Switching Regulator Controller
for Pentium® II Processor
ADP3152
a
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
Integrated Overvoltage Protection Crowbar
16-Lead SOIC Package
VRM 8.2 Compatible
GENERAL DESCRIPTION
The ADP3152 is a highly efficient synchronous switching regulator controller optimized for Pentium II 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 ADP3152 uses a current mode constant off-time architecture to generate its precise output voltage.
OBS
APPLICATIONS
Desktop PC Power Supply for:
Pentium II Processor
Pentium Pro Processor
Pentium Processor
AMD–K6 Processor
VRM Modules
The ADP3152 drives two N-channel MOSFETS in a synchronous rectified buck converter, at a maximum switching frequency of 250 kHz. Using the recommended loop compensation
and guidelines, the ADP3152 provides a dc/dc converter that
meets Intel’s stringent transient specifications with a minimum
number of output capacitors and smallest footprint. Additionally,
the current mode architecture also provides guaranteed short
circuit protection and adjustable current limiting.
OLE
VCC
+12V
1F
22F
TE
VIN
+5V
+
CIN
VCC
DRIVE1
SD
R1
ADP3152
IRL3103
L
2.5H
RSENSE
6.7m⍀
CMP
R2
CCOMP
+
SENSE+
1nF
CT
CO
VO
1.8V–3.5V
14A
SENSE–
150pF
AGND
10BQ015
DRIVE2
IRL3103
PGND
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
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.
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© Analog Devices, Inc., 1998
