ISL6622AIRZ-T

DATASHEET ISL6622A VR11.1 Compatible Synchronous Rectified Buck MOSFET Drivers The ISL6622A 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 ISL6622A 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 ISL6622A 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. In the 8 Ld SOIC package, the ISL6622A drives the upper gate to 12V while the lower get can be driven from 5V to 12V. The 10 Ld DFN part allows for more flexibility. The upper gate can be driven from 5V to 12V using the UVCC pin and the lower gate can also be driven from 5V to 12V using the LVCC pin. This provides the flexibility necessary to optimize applications involving trade-offs between gate charge and conduction losses. To further enhance light load efficiency, the ISL6622A 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 ISL6622A has a 20k integrated high-side gate-to-source resistor to prevent self turn-on due to high input bus dV/dt. This driver adds an overvoltage protection feature operational while VCC is below its POR threshold; the PHASE node is connected to the gate of the low side MOSFET (LGATE) via a 10k resistor limiting the output voltage of the converter close to the gate threshold of the low side MOSFET, dependent on the current being shunted, which provides some protection to the load should the upper MOSFET(s) become shorted. FN6601 Rev 2.00 March 19, 2009 FN6601 Rev 2.00 March 19, 2009 Features • Dual MOSFET Drives for Synchronous Rectified Bridge • Advanced Adaptive Zero Shoot-Through Protection • 36V Internal Bootstrap Schottky Diode • Diode Emulation For Enhanced Light Load Efficiency • Bootstrap Capacitor Overcharging Prevention • Supports High Switching Frequency - 3A Sinking Current Capability - Fast Rise/Fall Times and Low Propagation Delays • Advanced PWM Protocol (Patent Pending) to Support PSI Mode, Diode Emulation, Three-State Operation • Pre-POR Overvoltage Protection for Start-up and Shutdown • VCC Undervoltage Protection • Expandable Bottom Copper Pad for Enhanced Heat Sinking • Dual Flat No-Lead (DFN) Package - Near Chip-Scale Package Footprint; Improves PCB Efficiency and Thinner in 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 Page 1 of 11 ISL6622A Ordering Information PART NUMBER (Note) PART MARKING TEMP. RANGE (°C) PACKAGE (Pb-Free) PKG. DWG. # ISL6622ACBZ* 6622A CBZ 0 to +70 8 Ld SOIC M8.15 ISL6622ACRZ* 622A 0 to +70 10 Ld 3x3 DFN L10.3x3 ISL6622AIBZ* 6622A IBZ -40 to +85 8 Ld SOIC M8.15 ISL6622AIRZ* 22AI -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 ISL6622A (10 LD 3x3 DFN) TOP VIEW ISL6622A (8 LD SOIC) TOP VIEW UGATE 1 8 PHASE BOOT 2 7 VCC PWM 3 6 LVCC GND 4 5 LGATE Block Diagrams UGATE 1 10 PHASE BOOT 2 9 VCC NC 3 8 UVCC PWM 4 7 LVCC GND 5 6 LGATE PAD ISL6622A UVCC BOOT UGATE 20k VCC PHASE +5V 11.2k PRE-POR OVP FEATURES SHOOTTHROUGH PROTECTION LVCC 10k POR/ PWM LVCC CONTROL 9.6k LOGIC LGATE GND UVCC = VCC FOR SOIC FN6601 Rev 2.00 March 19, 2009 Page 2 of 11 ISL6622A Typical Application Circuit +12V +5V BOOT VIN LVCC +5V VCC UGATE PHASE ISL6622A DRIVER LGATE DAC COMP VCC FB GND PWM REF VDIFF VSEN PWM1 RGND VTT ISEN1- EN_VTT +5V BOOT +12V VIN PVCC ISEN1+ VR_RDY UGATE VID7 ISL6334 ISL6334 VID6 VCC VID5 PHASE ISL6612 DRIVER LGATE VID4 PWM2 VID3 VID2 GND PWM ISEN2- VID1 ISEN2+ VID0 +5V PSI PWM3 VR_FAN +12V BOOT VIN PVCC µP LOAD ISEN3- VR_HOT UGATE ISEN3+ VIN VCC PHASE ISL6612 DRIVER EN_PWR LGATE GND PWM GND PWM4 IMON ISEN4- ISEN4+ TCOMP TM +5V +5V OFS FS SS +12V PVCC BOOT VIN +5V UGATE PHASE VCC ISL6612 DRIVER NTC LGATE PWM FN6601 Rev 2.00 March 19, 2009 GND Page 3 of 11 ISL6622A Absolute Maximum Ratings Thermal Information Supply Voltage (VCC, UVCC, LVCC) . . . . . . . . . . . . . . . . . . . . .15V BOOT Voltage (VBOOT-GND). . . . . . . . . . . . . . . . . . . . . . . . . . . .36V Input Voltage (VPWM) . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 7V UGATE. . . . . . . . . . . . . . . . . . . VPHASE - 0.3VDC to VBOOT + 0.3V VPHASE - 3.5V (