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Analog Devices Semiconductor Electronic Components Datasheet

ADP3159 Datasheet

4-Bit Programmable Synchronous Buck Controllers

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ADP3159 pdf
a
FEATURES
Optimally Compensated Active Voltage Positioning
with Gain and Offset Adjustment (ADOPT™) for
Superior Load Transient Response
Complies with VRM 8.4 Specifications with Lowest
System Cost
4-Bit Digitally Programmable 1.3 V to 2.05 V Output
N-Channel Synchronous Buck Driver
Two On-Board Linear Regulator Controllers
Total Accuracy ؎0.8% Over Temperature
High Efficiency Current-Mode Operation
Short Circuit Protection
Power Good Output
Overvoltage Protection Crowbar Protects Micro-
processors with No Additional External Components
APPLICATIONS
Core Supply Voltage Generation for:
Intel Pentium® III
Intel Celeron™
4-Bit Programmable
Synchronous Buck Controllers
ADP3159/ADP3179
FUNCTIONAL BLOCK DIAGRAM
GND
LRFB1
LRDRV1
LRFB2
LRDRV2
COMP
VCC
CT
ADP3159/ADP3179
UVLO
& BIAS
OSCILLATOR
SET
RESET
REFERENCE
CROWBAR
REF
PWM
DRIVE
VLR1
DAC+20%
VLR2
REF
DAC–20%
CMP
–+
gm
VID DAC
DRVH
DRVL
PWRGD
CS–
CS+
FB
GENERAL DESCRIPTION
The ADP3159 and ADP3179 are highly efficient output syn-
chronous buck switching regulator controllers optimized for
converting a 5 V main supply into the core supply voltage
required by high-performance processors. These devices use an
internal 4-bit DAC to read a voltage identification (VID) code
directly from the processor, which is used to set the output
voltage between 1.3 V and 2.05 V. They use a current mode,
constant off-time architecture to drive two N-channel
MOSFETs at a programmable switching frequency that can be
optimized for regulator size and efficiency.
The ADP3159 and ADP3179 also use a unique supplemental
regulation technique called Analog Devices Optimal Position-
ing Technology (ADOPT) to enhance load transient
performance. Active voltage positioning results in a dc/dc con-
verter that meets the stringent output voltage specifications
for high-performance processors, with the minimum number
VID3 VID2 VID1 VID0
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 it is always optimally positioned for a system tran-
sient. The devices also provide accurate and reliable short
circuit protection and adjustable current limiting. They also
include an integrated overvoltage crowbar function to protect
the microprocessor from destruction in case the core supply
exceeds the nominal programmed voltage by more than 20%.
The ADP3159 and ADP3179 contain two fixed-output volt-
age linear regulator controllers that are designed to drive
external N-channel MOSFETs. The outputs are internally
fixed at 2.5 V and 1.8 V in the ADP3159, while the ADP3179
provides adjustable output, which is set using an external
resistor divider. These linear regulators are used to generate
the auxiliary voltages (AGP, GTL, etc.) required in most moth-
erboard designs, and have been designed to provide a high
bandwidth load-transient response.
The ADP3159 and ADP3179 are specified over the commercial
temperature range of 0°C to 70°C and are available in a 20-lead
TSSOP package.
ADOPT is a trademark of Analog Devices, Inc.
Pentium is a registered trademark of Intel Corporation.
Celeron is a trademark of Intel Corporation.
REV. A
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

ADP3159 Datasheet

4-Bit Programmable Synchronous Buck Controllers

No Preview Available !

ADP3159 pdf
ADP3159/ADP3179–SPECIFICATIONS1
(VCC = 12 V, TA = 0؇C to 70؇C, unless otherwise noted.)
Parameter
Symbol Conditions
Min Typ Max Unit
FEEDBACK INPUT
Output Accuracy
1.3 V Output
1.65 V Output
2.05 V Output
Line Regulation
Crowbar Trip Point
Crowbar Reset Point
Crowbar Response Time
VID INPUTS
Input Low Voltage
Input High Voltage
Input Current
Pull-Up Resistance
Internal Pull-Up Voltage
VFB
VOUT
VCROWBAR
tCROWBAR
Figure 1
Figure 1
Figure 1
VCC = 10 V to 14 V
% of Nominal DAC Voltage
% of Nominal DAC Voltage
Overvoltage to DRVL Going High
VIL(VID)
VIH(VID)
IVID
RVID
VID(X) = 0 V
1.289
1.637
2.034
115
40
1.3
1.65
2.05
0.06
120
50
400
1.311 V
1.663 V
2.066 V
%
125 %
60 %
ns
0.6 V
2.0 V
185 250 µA
20 30
k
5.0 5.4 5.7 V
OSCILLATOR
Off Time
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
TA = 25°C, CT = 200 pF
ICT TA = 25°C, VOUT in Regulation
TA = 25°C, VOUT = 0 V
RO(ERR)
gm(ERR)
IO(ERR)
VCOMP(MAX)
VCOMP(OFF)
BWERR
FB– Forced to VOUT – 3%
FB– Forced to VOUT – 3%
COMP = Open
VCS(TH)
ICS+, ICS–
tCS
FB– Forced to VOUT – 3%
FB– 0.45 V
0.8 V COMP 1 V
CS+ = CS– = VOUT
CS+ – (CS–) > 87 mV to DRVH
Going Low
3.5 4.0 4.5 µs
130 150 170 µA
25 35 45 µA
1 m
2.05 2.2 2.35 mmho
625 µA
3.0 V
600 750 900 mV
500 kHz
69 78 87 mV
35 45 54 mV
1 5 mV
0.5 5
µA
50 ns
OUTPUT DRIVERS
Output Resistance
Output Transition Time
LINEAR REGULATORS
Feedback Current
LR1 Feedback Voltage
LR2 Feedback Voltage
Driver Output Voltage
RO(DRV(X))
tR, tF
IL = 50 mA
CL = 3000 pF
6
80
ILRFB(X)
VLRFB(1)
VLRFB(2)
VLRDRV(X)
ADP3159 Figure 2, VCC = 4.5 V to 12.6 V
ADP3179 Figure 2, VCC = 2-4.5 V to 12.6 V
ADP3159 Figure 2, VCC = 4.5 V to 12.6 V
ADP3179 Figure 2, VCC = 2-4.5 V to 12.6 V
VCC = 4.5 V, VLRFB(X) = 0 V
2.44
0.97
1.75
0.97
4.2
0.3
2.5
1.0
1.8
1.0
ns
1 µA
2.56 V
1.03 V
1.85 V
1.03 V
V
POWER GOOD COMPARATOR
Undervoltage Threshold
Undervoltage Hysteresis
Overvoltage Threshold
Overvoltage Reset Point
Output Voltage Low
Response Time
VPWRGD(UV)
VPWRGD(OV)
VOL(PWRGD)
% of Nominal DAC Voltage
% of Nominal DAC Voltage
% of Nominal DAC Voltage
% of Nominal DAC Voltage
IPWRGD(SINK) = 1 mA
75 80 85 %
5%
115 120 125 %
40 50 60 %
250 500 mV
250 ns
SUPPLY
DC Supply Current2
UVLO Threshold Voltage
UVLO Hysteresis
ICC
VUVLO
7
6.75 7
0.8 1
9 mA
7.25 V
1.2 V
NOTES
1All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC).
2Dynamic supply current is higher due to the gate charge being delivered to the external MOSFETs.
Specifications subject to change without notice.
–2– REV. A


Part Number ADP3159
Description 4-Bit Programmable Synchronous Buck Controllers
Maker Analog Devices
Total Page 16 Pages
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