ISL6620CRZ

DATASHEET ISL6620, ISL6620A VR11.1 Compatible Synchronous Rectified Buck MOSFET Drivers The ISL6620, ISL6620A is a high frequency MOSFET driver designed to drive upper and lower power N-Channel MOSFETs in a synchronous rectified buck converter topology. The advanced PWM protocol of ISL6620, ISL6620A is specifically designed to work with Intersil VR11.1 controllers and combined with N-Channel MOSFETs, form a complete core-voltage regulator solution for advanced microprocessors. When ISL6620, ISL6620A detects a PSI protocol sent by an Intersil VR11.1 controller, it activates Diode Emulation (DE) operation; otherwise, it operates in normal Continuous Conduction Mode (CCM) PWM mode. The IC is biased by a single low voltage supply (5V), minimizing driving losses in high MOSFET gate capacitance and high switching frequency applications. Each driver is capable of driving a 3nF load with less than 10ns rise/fall time. Bootstrapping of the upper gate driver is implemented via an internal low forward drop diode, reducing implementation cost, complexity, and allowing the use of higher performance, cost effective N-Channel MOSFETs. To further enhance light load efficiency, ISL6620, ISL6620A enables diode emulation operation during PSI mode. This allows Discontinuous Conduction Mode (DCM) by detecting when the inductor current reaches zero and subsequently turning off the low side MOSFET to prevent it from sinking current. An advanced adaptive shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously and to minimize dead time. The ISL6620, ISL6620A has a 20k integrated high-side gate-to-source resistor to prevent self turn-on due to high input bus dV/dt. FN6494 Rev 0.00 April 25, 2008 Features • Dual MOSFET Drives for Synchronous Rectified Bridge • Advanced Adaptive Zero Shoot-Through Protection • 36V Internal Bootstrap Schottky Diode • Advanced PWM Protocol (Patent Pending) to Support PSI Mode, Diode Emulation, Three-State Operation • Diode Emulation For Enhanced Light Load Efficiency • Bootstrap Capacitor Overcharging Prevention • Supports High Switching Frequency - 4A Sinking Current Capability - Fast Rise/Fall Times and Low Propagation Delays • VCC Undervoltage Protection • Enable Input and Power-On Reset • Expandable Bottom Copper Pad for Enhanced Heat Sinking • DFN Package: - Compliant to JEDEC PUB95 MO-220 DFN - Dual Flat No Leads - Package Outline - Near Chip Scale Package Footprint, which Improves PCB Efficiency and has a Thinner Profile • Pb-Free (RoHS Compliant) Applications • High Light Load Efficiency Voltage Regulators • Core Regulators for Advanced Microprocessors • High Current DC/DC Converters • High Frequency and High Efficiency VRM and VRD Related Literature • Technical Brief TB363 “Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)” • Technical Brief TB417 “Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators” for Power Train Design, Layout Guidelines, and Feedback Compensation Design FN6494 Rev 0.00 April 25, 2008 Page 1 of 10 ISL6620, ISL6620A Ordering Information PART NUMBER (Note) PART MARKING TEMP. RANGE (°C) PACKAGE (Pb-free) PKG. DWG. # ISL6620CBZ* 6620 CBZ 0 to +70 8 Ld SOIC M8.15 ISL6620CRZ* 620Z 0 to +70 10 Ld 3x3 DFN L10.3x3 ISL6620IBZ* 6620 IBZ -40 to +85 8 Ld SOIC M8.15 ISL6620IRZ* 620I -40 to +85 10 Ld 3x3 DFN L10.3x3 ISL6620ACBZ* 6620A CBZ 0 to +70 8 Ld SOIC M8.15 ISL6620ACRZ* 620A 0 to +70 10 Ld 3x3 DFN L10.3x3 ISL6620AIBZ* 6620A IBZ -40 to +85 8 Ld SOIC M8.15 ISL6620AIRZ* 20AI -40 to +85 10 Ld 3x3 DFN L10.3x3 *Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Pinouts ISL6620, ISL6620A (10 LD 3x3 DFN) TOP VIEW ISL6620, ISL6620A (8 LD SOIC) TOP VIEW UGATE 1 8 PHASE BOOT 2 7 EN PWM 3 6 VCC GND 4 5 LGATE UGATE 1 BOOT 2 NC 3 PAD 9 EN 8 NC PWM 4 7 5 6 GND Block Diagrams 10 PHASE VCC LGATE ISL6620, ISL6620A *RBOOT VCC BOOT EN UGATE VCC PHASE SHOOTTHROUGH PROTECTION 4.25k PWM CONTROL LOGIC VCC 4k LGATE GND *INTEGRATED 3 RESISTOR (RBOOT) AVAILABLE ONLY IN ISL6620A FN6494 Rev 0.00 April 25, 2008 Page 2 of 10 ISL6620, ISL6620A Typical Application Circuit +5V BOOT EN +5V VCC VIN UGATE PHASE ISL6620, ISL6620A DRIVER FB COMP VCC DAC LGATE GND PWM REF VDIFF VSEN PWM1 RGND VTT +5V VCTRL ISEN1- EN_VTT BOOT VIN ISEN1+ VR_RDY VCC VID7 PHASE ISL6334 ISL6334 VID6 UGATE ISL6596 DRIVER VID5 LGATE VID4 PWM2 VID3 VID2 GND PWM ISEN2- VID1 ISEN2+ VID0 +5V PSI VCTRL PWM3 VR_FAN BOOT VIN µP LOAD ISEN3- VR_HOT VCC ISEN3+ UGATE VIN PHASE ISL6596 DRIVER EN_PWR LGATE GND PWM GND PWM4 IMON ISEN4ISEN4+ TCOMP TM +5V OFS FS SS +5V BOOT VCTRL VIN +5V VCC UGATE PHASE NTC ISL6596 DRIVER LGATE PWM FN6494 Rev 0.00 April 25, 2008 GND Page 3 of 10 ISL6620, ISL6620A Absolute Maximum Ratings Thermal Information Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Input Voltage (VEN, VPWM) . . . . . . . . . . . . . . . -0.3V to VCC + 0.3V BOOT Voltage (VBOOT-GND). . . -0.3V to 25V (DC) or 36V (