IMVP-II-Compliant
Core Power Controller for Mobile CPUs
a
ADP3422
FEATURES
FUNCTIONAL BLOCK DIAGRAM
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
VCC
ADP3422
HYSSET
CPUSET
FSHIFT
DSHIFT
BSHIFT
HYSTERESIS
AND
SHIFT-SETTING
VR
CS+
CS–
CLIM
VID4
VID3
VID2
VID1
VID0
EN
CORE
RAMP
REG
Controls Synchronous Rectifier for Improved Battery Life
PROGRAMMED
DAC
AND
APPLICATIONS
FIXED
REFERENCE
IMVP-II Enabled Core DC/DC Converters
Fixed-Voltage Mobile CPU Core DC/DC Converters
Notebook/Laptop Power Supplies
Programmable Output Power Supplies
OUT
DACOUT
SWFB
VR
VCC
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.
UVLO AND MAIN BIAS
PWRGD BLANKER
SR CONTROL
BOM
DSLP
COREFB
SS
PWRGD MONITOR
DPRSLP
PWRGD
SD
SS-HICCUPTIMER AND OCP
DRVLSD
CLAMP
OP MODE
SELECTOR
OVP AND RVP
POWER MANAGEMENT
GND
REV. 0
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