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Analog Devices Semiconductor Electronic Components Datasheet

ADP3163 Datasheet

5-Bit Programmable 2-/3-Phase Synchronous Buck Controller

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ADP3163 pdf
a
5-Bit Programmable 2-/3-Phase
Synchronous Buck Controller
ADP3163
FEATURES
ADOPT™ Optimal Positioning Technology for Superior
Load Transient Response and Fewest Output
Capacitors
Complies with VRM 9.0 and Intel VR Down Guideline
with Lowest System Cost
Digitally Selectable 2- or 3-Phase Operation
at up to 500 kHz per Phase
Quad Logic-level PWM Outputs for Interface to
External High-Power Drivers
Active Current Balancing between All Output Phases
Accurate Multiple VRM Module Current Sharing
5-Bit Digitally Programmable 1.1 V to 1.85 V Output
Total Output Accuracy ؎0.8% Over Temperature
Current-Mode Operation
Short Circuit Protection
Enhanced Power Good Output Detects Open Outputs in
Multi-VRM Power Systems
Overvoltage Protection Crowbar Protects Microprocessors
with No Additional External Components
APPLICATIONS
Desktop PC Power Supplies for:
Intel Pentium® 4 Processors
AMD Athlon Processors
VRM Modules
REF
GND
FUNCTIONAL BLOCK DIAGRAM
VCC
UVLO
& BIAS
3.0V
REFERENCE
ADP3163
SET
RESET
CROWBAR
PC
2-/3-PHASE
DRIVER
LOGIC
DAC+20%
CT OSCILLATOR
SHARE
COMP
SOFT
START
POWER
GOOD
CMP
CMP
DAC+20%
VID
DAC
gm
PWM1
PWM2
PWM3
PGND
PWRGD
CS–
CS+
FB
GENERAL DESCRIPTION
The ADP3163 is a highly efficient multiphase synchronous buck
switching regulator controller optimized for converting a 5 V or
12 V main supply into the core supply voltage required by high
performance Intel processors. The ADP3163 uses an internal
5-bit DAC to read a voltage identification (VID) code directly
from the processor, which is used to set the output voltage between
1.1 V and 1.85 V. The ADP3163 uses a current mode PWM
architecture to drive the logic-level outputs at a programmable
switching frequency that can be optimized for VRM size and
efficiency. The phase relationship of the output signals can be
programmed to provide 2- or 3-phase operation, allowing for
the construction of up to three complementary buck switching
stages. These stages share the dc output current to reduce
overall output voltage ripple. An active current balancing func-
tion ensures that all phases carry equal portions of the total load
current, even under large transient loads, to minimize the size of
the inductors.
VID4 VID3 VID2 VID1 VID0
The ADP3163 also uses a unique supplemental regulation tech-
nique called active voltage positioning (ADOPT) to enhance
load transient performance. Active voltage positioning results in
a dc/dc converter that meets the stringent output voltage specifi-
cations for high performance processors, with the minimum
number of output capacitors and smallest footprint. Unlike
voltage-mode and standard current-mode architectures, active
voltage positioning adjusts the output voltage as a function of
the load current so that it is always optimally positioned for a
system transient. The ADP3163 also provides accurate and
reliable short circuit protection, adjustable current limiting, and
an enhanced Power Good output that can detect open outputs
in any phase for single or multi-VRM systems.
The ADP3163 is specified over the commercial temperature
range of 0°C to 70°C and is available in a 20-lead TSSOP package.
ADOPT is a trademark of Analog Devices, Inc.
Pentium is a registered trademark of Intel Corporation.
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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


Analog Devices Semiconductor Electronic Components Datasheet

ADP3163 Datasheet

5-Bit Programmable 2-/3-Phase Synchronous Buck Controller

No Preview Available !

ADP3163 pdf
ADP3163–SPECIFICATIONS1
(VCC = 12 V, IREF = 150 A, TA = 0؇C to 70؇C, unless otherwise noted.)
Parameter
FEEDBACK INPUT
Accuracy
1.1 V Output
1.6 V Output
1.85 V Output
Line Regulation
Input Bias Current
Crowbar Trip Point
Crowbar Reset Point
Crowbar Response Time
REFERENCE
Output Voltage
Output Current
VID INPUTS
Input Low Voltage
Input High Voltage
Input Current
Pull-Up Resistance
Internal Pull-Up Voltage
OSCILLATOR
Maximum Frequency2
Frequency Variation
CT Charge Current
ERROR AMPLIFIER
Output Resistance
Transconductance
Output Current
Maximum Output Voltage
Output Disable Threshold
–3 dB Bandwidth
CURRENT SENSE
Threshold Voltage
Input Bias Current
Response Time
to PWM Going Low
CURRENT SHARING
Output Source Current
Output Sink Current
Maximum Output Voltage
PHASE CONTROL
Input Low Voltage
Input High Voltage
POWER GOOD COMPARATOR
Undervoltage Threshold
Overvoltage Threshold
Output Voltage Low
Response Time
Symbol
VFB
Conditions
VFB
IFB
VCROWBAR
tCROWBAR
VCC = 10 V to 14 V
% of Nominal Output
% of Nominal Output
Overvoltage to PWM Going Low
VREF
IREF
VIL(VID)
VIH(VID)
IVID
RVID
VID(X) = 0 V
fCT(MAX)
fCT
ICT
TA = 25°C, CT = 150 pF
TA = 25°C, CT = 68 pF
TA = 25°C, CT = 47 pF
TA = 25°C, VFB in Regulation
TA = 25°C, VFB = 0 V
RO(ERR)
gm(ERR)
IO(ERR)
VCOMP(MAX)
VCOMP(OFF)
BWERR
FB Forced to 0 V
FB Forced to VOUT – 3%
COMP = Open
VCS(TH)
ICS+, ICS–
tCS
CS+ = VCC,
FB Forced to VOUT – 3%
FB 750 mV
0.8 V SHARE 1 V
CS+ = CS– = VCC
CS+ – (CS–) 173 mV
Min Typ Max
1.091
1.587
1.835
115
40
1.1
1.6
1.85
0.01
5
120
50
400
1.109
1.613
1.865
50
125
60
2.952 3.00 3.048
300
0.8
2.0
70 90
33 43
2.7 3.0 3.3
3000
475
850
1100
260
40
575
1000
1300
300
65
675
1250
1500
340
80
1
2.0 2.2 2.45
575
3.0
800 875
500
143 158 173
80 92 108
05
15
50
VSHARE(MAX) FB Forced to VOUT – 3%
VIL(PC)
VIH(PC)
VPWRGD(UV)
VPWRGD(OV)
VOL(PWRGD)
Percent of Nominal Output
Percent of Nominal Output
IPWRGD(SINK) = 1 mA
2
300 400
3.0
0.8
2.0
75 80 85
115 120 125
375 525
250
Unit
V
V
V
%
nA
%
%
ns
V
µA
V
V
µA
k
V
kHz
kHz
kHz
kHz
µA
µA
M
mmho
µA
V
mV
kHz
mV
mV
mV
µA
ns
mA
µA
V
V
V
%
%
mV
ns
–2– REV. 0


Part Number ADP3163
Description 5-Bit Programmable 2-/3-Phase Synchronous Buck Controller
Maker Analog Devices
Total Page 16 Pages
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