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ADP3205 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADP3205
Description  Multiphase IMVP-IV Core Controller for Mobile CPUs
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP3205 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. Trademarks and
registered trademarks are the property of their respective companies.
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
© 2003 Analog Devices, Inc. All rights reserved.
ADP3205
Multiphase IMVP-IV
Core Controller for Mobile CPUs
FEATURES
Pin Programmable 1-, 2-, or 3-Phase Operation
Excellent Static and Dynamic Current Sharing
Superior Load Transient Response when Used with
ADOPT™ Optimal Positioning Technology
Noise-Blanking for Speed and Stability
Synchronous Rectification Control for Optimized Light
Load Efficiency
Soft DAC Output Voltage Transition for VID Change
Cycle-by-Cycle Current Limiting
Latched or Hiccup Current Overload Protection
Masked Power Good during Output Voltage Transients
Soft Start-Up without Power-On In-Rush Current Surge
2-Level Overvoltage and Reverse-Voltage Protection
APPLICATIONS
IMVP-IV CPU Core DC-to-DC Converters
Programmable Output Power Supplies
GENERAL DESCRIPTION
The ADP3205 is a 1-, 2-, or 3-phase hysteretic peak current mode
dc-to-dc buck converter controller dedicated to powering a mobile
processor’s core. The chip optimized low voltage design runs from
the 3.3 V system supply. The chip contains a precision 6-bit DAC
whose nominal output voltage is set by VID code. The ADP3205
features high speed operation to allow a minimized inductor size
that results in the fastest possible change of current to the output.
To further minimize the number of output capacitors, the con-
verter features active voltage positioning enhanced with ADOPT
optimal compensation to ensure a superior load transient response.
The output signals interface with ADP3415 MOSFET drivers,
which that are optimized for high speed and high efficiency. The
ADP3205 is capable of providing synchronous rectification control
to extend battery lifetime in light load conditions.
The ADP3205 is specified over the extended commercial temperature
range of 0
°C to 100°C and is available in a 40-lead LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
CORE
CMP
VID0
VID1
VID2
VID3
VID4
DACREF
GND
VCC
REG
ADP3205
SS
COREFB
PWRGD
SD
DPRSLP
HYSSET
DPSHIFT
CLAMP
RAMP
CS1
CS2
DPSLP
HYSTERESIS SET
AND
CLIM SET
CS+
DPRSET
VID5
BOOTSET
CURRENT
SENSE
MUX
CS–
CLIM/ZCS
CMP
HYS/CLIM
CONTROL
AND
CS MUX/
PHASE CONTROL
DRVCTRL
DRV2
DRV1
DRVLSD2
DRVLSD1
DAC
RES
NETWORK
REF
MUX
MASK
OVP
LATCH
RVP
LATCH
VRV
VOV
UVLO CMP
BIAS ENABLER
ALARM RST
SS/LATCH-OFF
TIMER
BAND GAP
AND
REF AMP
RVP CMP
ALARM
LATCHEN
VREF
VBG
RST
COREGD
PWRGD
LATCH
EOFSS
BOOT
19
DVP CMP
VDACREF
VBG
BOOT
CORE ABOVE CMP
CORE BELOW CMP
DRVCTRL
35
TSYNC
PSI
DRV3
40
DRVLSD3
VREF
PRWGD
MASKING
PRWGD
DELAY
DPWRGD
TPWRGD
CLKEN
22
DACREF
FB
34
CS3
33
36
37
VBG
DPSHIFT
SET
VREF
VREF
VBG
38
39


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