ADP3418KRZ Analog Devices, ADP3418KRZ Datasheet

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ADP3418KRZ

Manufacturer Part Number
ADP3418KRZ
Description
Manufacturer
Analog Devices
Datasheet

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FEATURES
All-in-one synchronous buck driver
Bootstrapped high-side drive
1 PWM signal generates both drives
Anticross-conduction protection circuitry
Output disable control turns off both MOSFETs to float the
APPLICATIONS
Multiphase desktop CPU supplies
Single-supply synchronous buck converters
Rev. D
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
output per Intel® VR 10 and AMD Opteron™ specifications
IN
2
ADP3418
S
R
1V
Q
Q
CMP
DELAY
DELAY
FUNCTIONAL BLOCK DIAGRAM
CMP
VCC
6
OD
3
Figure 1.
C
Dual Bootstrapped, 12 V MOSFET
VCC
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The ADP3418 is a dual, high voltage MOSFET driver optimized
for driving two N-channel MOSFETs, the two switches in a
nonisolated, synchronous, buck power converter. Each of the
drivers is capable of driving a 3000 pF load with a 30 ns
transition time. One of the drivers can be bootstrapped and is
designed to handle the high voltage slew rate associated with
floating high-side gate drivers. The ADP3418 includes
overlapping drive protection to prevent shoot-through current
in the external MOSFETs. The OD pin shuts off both the high-
side and the low-side MOSFETs to prevent rapid output
capacitor discharge during system shutdowns.
The ADP3418 is specified over the commercial temperature
range of 0°C to 85°C and is available in an 8-lead SOIC package.
4
VCC
Driver with Output Disable
1
8
7
5
6
BST
DRVH
SW
DRVL
PGND
C
R
BST1
BST1
D1
©2006 Analog Devices, Inc. All rights reserved.
R
G
C
BST2
12V
Q1
Q2
TO
INDUCTOR
ADP3418
www.analog.com

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ADP3418KRZ Summary of contents

Page 1

... Rev. D 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. ...

Page 2

ADP3418 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Timing Characteristics..................................................................... 6 ...

Page 3

SPECIFICATIONS BST = 0°C to 85°C, unless otherwise noted Table 1. Parameter SUPPLY Supply Voltage Range Supply Current OD INPUT Input Voltage High Input Voltage Low ...

Page 4

ADP3418 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter VCC BST DC <200 ns BST <200 ns DRVH (DC) DRVH (<200 ns) DRVL (DC) DRVL (<200 ns) IN, OD Operating Ambient Temperature Range Operating Junction Temperature Range Storage ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 BST Upper MOSFET Floating Bootstrap Supply. A capacitor connected between the BST and SW pins holds this bootstrapped voltage for the high-side MOSFET as it ...

Page 6

ADP3418 TIMING CHARACTERISTICS OD DRVH OR DRVL IN t pdlDRVL DRVL DRVH-SW SW Figure 4. Timing Diagram—Timing Is Referenced to the 90% and 10% Points, Unless Otherwise Noted t t pdlOD pdhOD 90% 10% Figure 3. Output Disable Timing Diagram ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS IN 1 DRVH 2 DRVL 3 Figure 5. DRVH Rise and DRVL Fall Times IN 1 DRVH 2 DRVL 3 Figure 6. DRVH Fall and DRVL Rise Times 12V 3nF LOAD ...

Page 8

ADP3418 25° 12V 3nF LOAD 200 400 600 800 FREQUENCY (kHz) Figure 11. Supply Current vs. Frequency 12V 3nF LOAD f ...

Page 9

THEORY OF OPERATION The ADP3418 is a dual MOSFET driver optimized for driving two N-channel MOSFETs in a synchronous buck converter topology. A single PWM input signal is all that is required to properly drive the high-side and the low-side ...

Page 10

ADP3418 APPLICATION INFORMATION SUPPLY CAPACITOR SELECTION For the supply input ( the ADP3418, a local bypass CC capacitor is recommended to reduce the noise and to supply some of the peak currents drawn, such as a 4.7 μF, ...

Page 11

The MOSFET vendor should provide a maximum voltage slew rate at the drain current rating such that this can be designed around. Once this specification is had, the next step is to determine the maximum current expected to be seen ...

Page 12

ADP3418 PC BOARD LAYOUT CONSIDERATIONS Use the following general guidelines when designing printed circuit boards: • Trace out the high current paths and use short, wide (>20 mil) traces to make these connections. • Connect the PGND pin of the ...

Page 13

Figure 15. VR 10.x-Compliant Intel CPU Supply Circuit Rev Page ADP3418 ...

Page 14

... CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN ORDERING GUIDE Model Temperature Range 1 ADP3418KRZ 0°C to 85°C 1 ADP3418KRZ-REEL 0°C to 85° Pb-free part. 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2440) 5.80 (0.2284) ...

Page 15

NOTES Rev Page ADP3418 ...

Page 16

... ADP3418 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C03229–0–3/06(D) T Rev Page ...

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