ADP3154JRU-REEL Analog Devices Inc, ADP3154JRU-REEL Datasheet

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ADP3154JRU-REEL

Manufacturer Part Number
ADP3154JRU-REEL
Description
IC PS DUAL PENTIUM III 20-TSSOP
Manufacturer
Analog Devices Inc
Datasheet
1.ADP3154JRU-REEL.pdf (12 pages)

Specifications of ADP3154JRU-REEL

Rohs Status
RoHS non-compliant
Applications
*
Mounting Type
Surface Mount
Package / Case
20-TSSOP
a
Pentium is a registered trademark of Intel Corporation.
All other trademarks are the property of their respective holders.
REV. A
GENERAL DESCRIPTION
The ADP3154 is a highly efficient synchronous buck switching
regulator controller optimized for converting the 5 V main sup-
ply into the core supply voltage required by the Pentium III and
other high performance processors. The ADP3154 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 1.3 V and 3.5 V. The ADP3154 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 position-
ing to enhance load transient performance.
Active voltage positioning results in a dc/dc converter that meets
the stringent output voltage specifications for Pentium II and
Pentium III 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 ADP3154 provides accurate and reliable short circuit pro-
tection 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%.
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.
FEATURES
Active Voltage Positioning with Gain and Offset
Optimal Compensation for Superior Load Transient
VRM 8.2, VRM 8.3 and VRM 8.4 Compliant
5-Bit Digitally Programmable 1.3 V to 3.5 V Output
Dual N-Channel Synchronous Driver
Onboard Linear Regulator Controller
Total Output Accuracy
High Efficiency, Current-Mode Operation
Short Circuit Protection
Overvoltage Protection Crowbar Protects
Power Good Output
TSSOP-20 Package
APPLICATIONS
Desktop PC Power Supplies for:
Adjustment
Response
Microprocessors with No Additional External
Pentium II and Pentium III Processor Families
AMD-K6 Processors
VRM Modules
Components
1% Over Temperature
5-Bit Programmable Dual Power Supply
Controller for Pentium
The ADP3154 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
1000 F
SD
C
V
T
O2
V
CC
V
DRIVE1 DRIVE2 PGND
Q
T2
NONOVERLAP
IN
35k
20k
S
R
OFF-TIME
CONTROL
ADP3154
CROWBAR
DRIVE
R1
R2
OFF
CMPT
FUNCTIONAL BLOCK DIAGRAM
Figure 1. Typical Application
200pF
C
22 F
COMP
World Wide Web Site: http://www.analog.com
V
SENSE–
CMPI
IN
V
VLDO
FB
CMP
AGND
REF
SD
C
5-BIT CODE
1 F
T
ADP3154
VID0–VID4
V
CMP
CC
+15%
AGND
V
SENSE+
SENSE–
CC
DRIVE2
+12V
DRIVE1
V
PGND
DELAY
REF
V
®
T1
g
+5% V
m
III Processors
PWRGD
© Analog Devices, Inc., 1999
1nF
V
REF
V
IN
REF
ADP3154
REFERENCE
+5V
–5%
DAC
1.20V
+
C
SENSE+
IN
L
R
SENSE
SENSE–
R
2R
+
C
V
1.3V TO
3.5V
O
O
FB
VLDO
VID0
VID1
VID2
VID3
VID4

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ADP3154JRU-REEL Summary of contents

Page 1

FEATURES Active Voltage Positioning with Gain and Offset Adjustment Optimal Compensation for Superior Load Transient Response VRM 8.2, VRM 8.3 and VRM 8.4 Compliant 5-Bit Digitally Programmable 1 3.5 V Output Dual N-Channel Synchronous Driver Onboard Linear ...

Page 2

ADP3154–SPECIFICATIONS Parameter OUTPUT ACCURACY 1.3 V Output Voltage 2.0 V Output Voltage 3.5 V Output Voltage OUTPUT VOLTAGE LINE REGULATION 2 INPUT DC SUPPLY CURRENT Normal Mode Shutdown CURRENT SENSE THRESHOLD VOLTAGE VID0–VID4 PINS THRESHOLD Low High VID0–VID4 PINS INPUT ...

Page 3

... ORDERING GUIDE Temperature Package Model Range Description ADP3154JRU +70 C Thin Shrink Small RU-20 Outline (TSSOP) CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP3154 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 4

ADP3154 100k P 1 SYSTEM IRLR2703 9 470pF 10 2N2222 1 +3.3V R 0.5A PROG 35k 1000 F R3 20k RTN Figure 2. Typical VRM8.2/8.3/8.4 Compliant Core DC/DC Converter Circuit ...

Page 5

V = 3.5V OUT V = 2.8V OUT 2.0V OUT 1.3V OUT 75 70 SEE FIGURE 2 65 1.4 2.8 4.2 5.6 7 8.4 9.8 11.2 12.6 14 OUTPUT CURRENT – ...

Page 6

ADP3154 ADP3154 DRIVE1 CMP DRIVE2 1k C SENSE+ T SENSE– 4700pF AGND PGND OP27 100k 1.2V 0.1 F Figure 13. Closed-Loop Test Circuit for Accuracy THEORY OF OPERATION The ADP3154 uses a current-mode, constant-off-time control technique to ...

Page 7

Power Good The ADP3154 has an internal monitor that senses the output voltage and drives the PWRGD pin of the device. This pin is an open drain output whose high level (when connected to a pull- up resistor) indicates that ...

Page 8

ADP3154 Inductor Selection The minimum inductor value can be calculated from ESR, off- time, dc output voltage and allowed peak-to-peak ripple voltage using the following equation OFF E MAX ( ) ...

Page 9

The R for each FET can be derived from the allowable DS(ON) dissipation the maximum output power is allowed for FET dissipation, the total dissipation will be 0. FETALL O OMAX Allocating half ...

Page 10

ADP3154 of a resistor and capacitor. The required resistor value can be calculated from the equation: 275 275 k – Rt where TOTAL V – HI and where the ...

Page 11

Assuming that the 3.3 V supply is used to provide input power for a 1.5 V linear regulator output, the efficiency will inherently be 1.5 V 3.3 V, which is less than 50%. The total current demand in all of ...

Page 12

ADP3154 8. The output capacitors should also be connected as closely as possible to the load (or connector) that receives the power (e.g., a microprocessor core). If the load is distrib- uted, the capacitors also should be distributed, and gen- ...

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