ADP3156JR-15 Datasheet PDF - Analog Devices
| Part Number | ADP3156JR-15 | |
| Description | Dual Power Supply Controller for Desktop Systems | |
| Manufacturers | Analog Devices | |
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a
Dual Power Supply Controller
for Desktop Systems
ADP3156
FEATURES
Active Voltage Positioning with Gain and Offset
Adjustment
Optimal Compensation for Superior Load Transient
Response
Fixed 1.5 V, 1.8 V and 2.5 V Output Versions
Dual N-Channel Synchronous Driver
On-Board Linear Regulator Controller
Total Output Accuracy ؎1% Over Temperature
High Efficiency, Current-Mode Operation
Short Circuit Protection
Overvoltage Protection Crowbar Protects Loads with
No Additional External Components
Power Good Output
SO-16 Package
APPLICATIONS
Desktop Computer Supplies
ACPI-Compliant Power Systems
General Purpose DC-DC Converters
GENERAL DESCRIPTION
The ADP3156 is a highly efficient synchronous buck switching
regulator controller optimized for converting the 3.3 V or 5 V
main supply into lower supply voltages required on the mother-
boards of Pentium® III and other high performance processor
systems. The ADP3156 uses a current mode, constant off-time
architecture to drive two external N-channel MOSFETs at a
programmable switching frequency that can be optimized for
size and efficiency. It also uses a unique supplemental regulation
technique called active voltage positioning to enhance load
transient performance. Active voltage positioning results in a
DC/DC converter that provides the best possible transient re-
sponse using 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 ADP3156 provides accurate and reliable short circuit
protection and adjustable current limiting. It also includes an
integrated overvoltage crowbar function to protect the micro-
processor from destruction in case the core supply exceeds the
nominal programmed voltage by more than 15%.
FUNCTIONAL BLOCK DIAGRAM
VCC DRIVE1 DRIVE2 PGND AGND PWRGD SENSE+ SENSE–
DELAY
NONOVERLAP
SD
DRIVE
VREF +15%
CROWBAR
IN OFF
CMPI
VREF +5% VREF –5%
2R
S
Q
R
VT2
VT1
VREF
gm
R
REFERENCE
CT CMPT
OFF-TIME VIN
CONTROL SENSE–
1.20V
ADP3156
VLDO
FB
CMP
The ADP3156 contains a linear regulator controller that is
designed to drive an external N-channel MOSFET. This linear
regulator is used to generate the auxiliary voltages (AGP, GTL,
etc.) required in most motherboard designs, and has been de-
signed to provide a high bandwidth load-transient response. A
pair of external feedback resistors sets the linear regulator out-
put voltage.
VO2
1000F
VCC +12V
22F 1F
R1
35k⍀
20k⍀
R2
SD VCC
DRIVE1
VLDO
ADP3156
CCOMP
200pF
SENSE+
FB
CMP SENSE–
DRIVE2
CT
AGND PGND
VIN +5V
CIN
+
L RSENSE
VO
+
1nF CO
Figure 1. Typical Application
Pentium is a registered trademark of Intel Corporation.
All other trademarks are the property of their respective holders.
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
which 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 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
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100
95 VOUT = 2.5V
VOUT = 1.8V
90
85
VOUT = 1.5V
80
75
0.5
SEE FIGURE 2
1.5 2.5 3.5 4.5 5.5 6.5
OUTPUT CURRENT – Amps
Figure 4. Efficiency vs. Output
Current
Typical Performance Characteristics–ADP3156
450
400
350
300
250
200
150
100
50
0
50 100 200 300 400 500 600 700 800
TIMING CAPACITOR – pF
Figure 5. Frequency vs. Timing
Capacitor
45
40
35
30
25
20
15
10
5
0
45
QGATE(TOTAL) = 100nC
58 83 134
OPERATING FREQUENCY – kHz
397
Figure 6. Supply Current vs.
Operating Frequency
SEE FIGURE 2
IOUT = 10A
PRIMARY
N-DRIVE
DRIVER OUTPUT
1
SECONDARY
N-DRIVE
DRIVER OUTPUT
2
DRIVE 1 AND 2 = 5V/DIV
500ns/DIV
Figure 7. Gate Switching Waveforms
SEE FIGURE 2
VCC = +12V
VIN = +5V
IOUT = 10A
100ns/DIV
Figure 8. Driver Transition
Waveforms
OUTPUT VOLTAGE
50mV/DIV
OUTPUT CURRENT
7A TO 1A
10s/DIV
Figure 9. Transient Response,
7 A–1 A of Figure 2 Circuit
OUTPUT VOLTAGE
50mV/DIV
OUTPUT CURRENT
1A TO 7A
10s/DIV
Figure 10. Transient Response,
1 A–7 A of Figure 2 Circuit
VCC VOLTAGE
5V/DIV
3
REGULATOR
OUTPUT VOLTAGE
1V/DIV
4
10ms/DIV
Figure 11. Power-On Start-Up
Waveforms
REV. 0
–5–
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for ADP3156JR-15 electronic component. |
| Information | Total 12 Pages | |
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| Download | [ ADP3156JR-15.PDF Datasheet ] | |
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