ADP3120AJRZ

Dual Bootstrapped, 12 V MOSFET Driver with Output Disable ADP3120A FEATURES GENERAL DESCRIPTION All-in-one synchronous buck driver Bootstrapped high-side drive One PWM signal generates both drives Anticross conduction protection circuitry OD for disabling the driver outputs Meets CPU VR requirement when used with Analog Devices Flex -Mode™ 1 controller The ADP3120A 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 driver is capable of driving a 3000 pF load with a 45 ns propagation delay and a 25 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 ADP3120A includes overlapping drive protection to prevent shoot-through current in the external MOSFETs. APPLICATIONS Multiphase desktop CPU supplies Single-supply synchronous buck converters The OD pin shuts off both the high-side and the low-side MOSFETs to prevent rapid output capacitor discharge during system shutdown. The ADP3120A is specified over the commercial temperature range of 0°C to 85°C and is available in 8-lead SOIC_N and 8-lead LFCSP_VD packages. 1 Flex-Mode is protected by U.S. Patent 6683441; other patents pending. FUNCTIONAL BLOCK DIAGRAM 12V D1 VCC 4 BST ADP3120A 1 LATCH R1 R2 Q S IN 2 CBST2 CBST1 DRVH RG 8 Q1 DELAY RBST TO INDUCTOR SW 7 CMP VCC 6 CMP CONTROL LOGIC DRVL Q2 5 PGND DELAY 6 OD 3 05812-001 1V Figure 1. 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 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. ADP3120A TABLE OF CONTENTS Features .............................................................................................. 1 Low-Side Driver ............................................................................9 Applications....................................................................................... 1 High-Side Driver ...........................................................................9 General Description ......................................................................... 1 Overlap Protection Circuit...........................................................9 Functional Block Diagram .............................................................. 1 Application Information................................................................ 10 Revision History ............................................................................... 2 Supply Capacitor Selection ....................................................... 10 Specifications..................................................................................... 3 Bootstrap Circuit........................................................................ 10 Absolute Maximum Ratings............................................................ 4 MOSFET Selection..................................................................... 10 ESD Caution.................................................................................. 4 High-Side (Control) MOSFETs................................................ 10 Pin Configurations and Function Descriptions ........................... 5 Low-Side (Synchronous) MOSFETs ........................................ 11 Timing Characteristics..................................................................... 6 PC Board Layout Considerations............................................. 11 Typical Performance Characteristics ............................................. 7 Outline Dimensions ....................................................................... 13 Theory of Operation ........................................................................ 9 Ordering Guide .......................................................................... 13 REVISION HISTORY 3/06—Revision 0: Initial Version Rev. 0 | Page 2 of 16 ADP3120A SPECIFICATIONS VCC = 12 V, BST = 4 V to 26 V, TA = 0°C to 85°C, unless otherwise noted. 1 Table 1. Parameter DIGITAL INPUTS (PWM, OD) Input Voltage High Input Voltage Low Input Current Hysteresis HIGH-SIDE DRIVER Output Resistance, Sourcing Current Symbol Propagation Delay Times −1 90 trDRVH tfDRVH tpdhDRVH tpdlDRVH t pdl OD tpdh OD SW Pull-Down Resistance LOW-SIDE DRIVER Output Resistance, Sourcing Current Output Resistance, Sinking Current Output Resistance, Unbiased Transition Times Propagation Delay Times trDRVL tfDRVL tpdhDRVL tpdlDRVL t pdl OD tpdh Timeout Delay SUPPLY Supply Voltage Range Supply Current UVLO Voltage Hysteresis 1 Min Typ Max Unit 0.8 +1 V V μA mV 2.0 Output Resistance, Sinking Current Output Resistance, Unbiased Transition Times Conditions VCC ISYS OD BST − SW = 12 V ; TA = 25°C BST − SW = 12 V ; TA = 0°C to 85°C BST – SW = 12 V; TA = 25°C BST − SW = 12 V; TA = 0°C to 85°C BST – SW = 0 V BST – SW = 12 V, CLOAD = 3 nF, see Figure 5 BST – SW = 12 V, CLOAD = 3 nF, see Figure 5 BST – SW = 12 V, CLOAD = 3 nF, 25°C ≤ TA ≤ 85°C, see Figure 5 BST – SW = 12 V, CLOAD = 3 nF, see Figure 5 See Figure 4 250 1.4 10 25 20 45 40 30 70 Ω Ω Ω Ω kΩ ns ns ns 25 20 35 35 ns ns See Figure 4 40 55 ns SW to PGND 10 2.5 32 TA = 25°C TA = 0°C to 85°C TA = 25°C TA = 0°C to 85°C VCC = PGND CLOAD = 3 nF, see Figure 5 CLOAD = 3 nF, see Figure 5 CLOAD = 3 nF, see Figure 5 CLOAD = 3 nF, see Figure 5 See Figure 4 2.4 1.4 10 20 16 12 30 20 3.3 3.9 1.8 2.6 kΩ 3.3 3.9 1.8 2.6 35 30 35 45 35 Ω Ω Ω Ω kΩ ns ns ns ns ns See Figure 4 110 190 ns SW = 5 V SW = PGND 110 95 190 150 ns ns 4.15 BST = 12 V, IN = 0 V VCC rising 2 1.5 350 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC) methods. Rev. 0 | Page 3 of 16 13.2 5 3.0 V mA V mV ADP3120A ABSOLUTE MAXIMUM RATINGS Table 2. Parameter VCC BST DC