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ADP3422 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADP3422
Description  IMVP-II-Compliant Core Power Controller for Mobile CPUs
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP3422 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
ADP3422
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
IMVP-II-Compliant
Core Power Controller for Mobile CPUs
FUNCTIONAL BLOCK DIAGRAM
HYSTERESIS
AND
SHIFT-SETTING
VID4
VID3
VID2
VID1
VID0
CS+
CS–
ADP3422
VR
CLIM
CORE
PROGRAMMED
DAC
AND
FIXED
REFERENCE
VCC
VCC
VR
GND
COREFB
SS
DRVLSD
CLAMP
RAMP
REG
OUT
DACOUT
SWFB
EN
UVLO AND MAIN BIAS
SR CONTROL
PWRGD MONITOR
PWRGD BLANKER
SS-HICCUP TIMER AND OCP
OVP AND RVP
OP MODE
SELECTOR
POWER MANAGEMENT
SD
PWRGD
DPRSLP
DSLP
BOM
CPUSET
HYSSET
FSHIFT
DSHIFT
BSHIFT
FEATURES
Certified IMVP-II Controller
Excellent Transient Containment
Minimum Number of Output Capacitors
Fast, Smooth, Output Transition During VID Code Change
Current Limit with Hiccup Protection
Transient-Glitch-Free Power Good
Low Shutdown Current
Soft Start Eliminates In-Rush Current Surge
Adaptive Noise-Blanking Enhancement for Speed and
Stability
Highly Redundant Over-Voltage and Reverse-Voltage
Protection
Controls Synchronous Rectifier for Improved Battery Life
APPLICATIONS
IMVP-II Enabled Core DC/DC Converters
Fixed-Voltage Mobile CPU Core DC/DC Converters
Notebook/Laptop Power Supplies
Programmable Output Power Supplies
GENERAL DESCRIPTION
The ADP3422 is a hysteretic dc-dc buck converter controller to
power a mobile processor’s core. The optimized low voltage
design is powered from the 3.3 V system supply. The output
voltage is set by a 5-bit VID code. To accommodate the transition
time required by the newest processors for on-the-fly VID
changes, the ADP3422 features high-speed operation to allow a
minimized inductor size that results in the fastest change of
current to the output. To further allow for the minimum number
of output capacitors to be used, the ADP3422 features active
voltage positioning that can be optimally compensated to ensure a
superior load transient response. The output signal interfaces
with the ADP3415 MOSFET driver that is optimized for high
speed and high efficiency for driving both the upper and lower
(synchronous) MOSFETs of the buck converter.


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