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  ON Semiconductor Electronic Components Datasheet  

ADP3164 Datasheet

5-Bit Programmable 4-Phase Synchronous Buck Controller

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ADP3164 pdf
a
FEATURES
ADOPT™ Optimal Positioning Technology for Superior
Load Transient Response and Fewest Output
Capacitors
Complies with VRM 9.1 with Lowest System Cost
4-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
VRM Modules
5-Bit Programmable 4-Phase
Synchronous Buck Controller
ADP3164
REF
GND
CT
FUNCTIONAL BLOCK DIAGRAM
VCC
UVLO
& BIAS
ADP3164
SET
RESET
CROWBAR
3.0V
REFERENCE
4-PHASE
DRIVER
LOGIC
OSCILLATOR
DAC + 20%
POWER
GOOD
PWM1
PWM2
PWM3
PWM4
PGND
PWRGD
SHARE
COMP
SOFT
START
CMP
CMP
DAC – 20%
VID
DAC
gm
CS–
CS+
FB
VID4 VID3 VID2 VID1 VID0
GENERAL DESCRIPTION
The ADP3164 is a highly efficient 4-phase synchronous buck
switching regulator controller optimized for converting a 12 V
main supply into the core supply voltage required by high per-
formance Intel processors. The ADP3164 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 ADP3164 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 four output phases share the dc output current
to reduce overall output voltage ripple. An active current bal-
ancing function ensures that all phases carry equal portions of
the total load current, even under large transient loads, to mini-
mize the size of the inductors.
Pentium is a registered trademark of Intel Corporation.
The ADP3164 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 ADP3164 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 ADP3164 is specified over the commercial temperature
range of 0°C to 70°C and is available in a 20-lead TSSOP package.
REVISION HISTORY
01/08 Rev 1: Conversion to ON Semiconductor
©2010 SCILLC. All rights reserved.
May 2010 - Rev. 2
Publication Order Number:
ADP3164/D


  ON Semiconductor Electronic Components Datasheet  

ADP3164 Datasheet

5-Bit Programmable 4-Phase Synchronous Buck Controller

No Preview Available !

ADP3164 pdf
ADP3164–SPECIFICATIONS1
(VCC = 12 V, IREF = 150 A, TA = 0C to 70C, unless otherwise noted.)
Parameter
Symbol Conditions
Min Typ Max Unit
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
VFB
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
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
V
V
V
%
nA
%
%
ns
2.952 3.00
300
3.048
V
A
0.8
2.0
70 90
33 43
2.7 3.0 3.3
V
V
A
k
V
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
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 = 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
to PWM Going Low
4000
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
kHz
kHz
kHz
kHz
A
A
M
mmho
A
V
mV
kHz
mV
mV
mV
A
ns
CURRENT SHARING
Output Source Current
Output Sink Current
Maximum Output Voltage
POWER GOOD COMPARATOR
Undervoltage Threshold
Overvoltage Threshold
Output Voltage Low
Response Time
VSHARE(MAX) FB Forced to VOUT – 3%
VPWRGD(UV)
VPWRGD(OV)
VOL(PWRGD)
Percent of Nominal Output
Percent of Nominal Output
IPWRGD(SINK) = 1 mA
2
300 400
3.0
75 80 85
115 120 125
375 525
250
mA
A
V
%
%
mV
ns
PWM OUTPUTS
Output Voltage Low
Output Voltage High
Duty Cycle Limit Per Phase2
VOL(PWM)
VOH(PWM)
DC
IPWM(SINK) = 400 A
IPWM(SOURCE) = 400 A
100 500
mV
4.0 5.0
V
25 %
Rev. 12 | Page 2 of 15 | www.onsemi.com
–2–
REV. 0


Part Number ADP3164
Description 5-Bit Programmable 4-Phase Synchronous Buck Controller
Maker ON Semiconductor
Total Page 15 Pages
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