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ADP3197 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADP3197
Description  6-Bit Programmable 2-/3-Phase Synchronous Buck Controller
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP3197 Datasheet(HTML) 1 Page - Analog Devices

 
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6-Bit Programmable 2-/3-Phase
Synchronous Buck Controller
ADP3197
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
FEATURES
Selectable 2-phase and 3-phase operation at up to 1 MHz
per phase
±10 mV worst-case differential sensing error over
temperature
Logic-level PWM outputs for interface to external high
power drivers
Enhanced PWM flex mode for excellent load transient
performance
Active current balancing between all output phases
Built-in power good/crowbar blanking that supports
on-the-fly VID code changes
Digitally programmable 0.3750 V to 1.55 V output
Programmable short-circuit protection with
programmable latch-off delay
APPLICATIONS
Desktop PC power supplies for
Next-generation AMD processors
Voltage regulator modules (VRM)
GENERAL DESCRIPTION
The ADP31971is a highly efficient multiphase synchronous buck
switching regulator controller optimized for converting a 12 V
main supply into the core supply voltage required by high perform-
ance, Advanced Micro Devices, AMD processors. It uses an
internal 6-bit digital-to-analog converter (DAC) to read a voltage
identification (VID) code directly from the processor, which is
used to set the output voltage between 0.3750 V and 1.55 V. It uses
a multimode pulse-width modulation (PWM) architecture to
drive the logic level outputs at a programmable switching
frequency that can be optimized for VR size and efficiency.
The phase relationship of the output signals can be programmed
to provide 2-phase or 3-phase operation, allowing for the
construction of up to three complementary buck switching stages.
The ADP3197 supports a programmable slope function to adjust
the output voltage as a function of the load current so it is always
optimally positioned for a system transient. This can be disabled
by connecting the LLSET pin to the CSREF pin.
The ADP3197 also provides accurate and reliable short-circuit
protection, adjustable current limiting, and a delayed power-
good output that accommodates on-the-fly output voltage
changes requested by the CPU.
1Protected by U.S. Patent Number 6,683,441; other patents pending.
FUNCTIONAL BLOCK DIAGRAM
VCC
PRECISION
REFERENCE
DELAY
+
GND
ADP3197
EN
DELAY
ILIMIT
PWRGD
RAMPADJ
RT
PWM2
PWM3
SW3
SW2
SW1
CSREF
CSCOMP
CSSUM
FB
PWM1
VID5 VID4 VID3
VID2
VID0
VID1
COMP
FBRTN
VID DAC
+
800mV
+
CSREF
2.2V
CURRENT
MEASUREMENT
AND LIMIT
CROWBAR
CURRENT
LIMIT
+
CURRENT
BALANCING
CIRCUIT
OD
SS
+
IREF
THERMAL
THROTTLING
CONTROL
TTSENSE
VRHOT
LLSET
UVLO
SHUTDOWN
SHUNT
REGULATOR
+
DAC – 250mV
OSCILLATOR
SOFT START
CONTROL
10
9
24
15
1
2
31
32
8
7
5
17
3
30
26
25
29
27
28
6
18
13
12
22
21
16
14
4
19
20
23
11
+
CMP
+
CMP
+
CMP
RESET
2-/3-PHASE
DRIVER LOGIC
EN
SET
RESET
RESET
Figure 1.
The ADP3197 has a built-in shunt regulator that allows the part
to be connected to the 12 V system supply through a series resistor.
The ADP3197 is specified over the extended commercial tempera-
ture range of 0°C to 85°C and is available in a 32-lead LFCSP.


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