ISL6627IRZ Renesas

DATASHEET ISL6627 FN6992 Rev 1.00 VR11.1, VR12 Compatible Synchronous Rectified Buck MOSFET Driver January 24, 2014 The ISL6627 is a high frequency MOSFET driver designed to Features drive upper and lower power N-Channel MOSFETs in a Intersil VR11.1 and VR12 Compatible synchronous rectified buck converter topology. The advanced PWM protocol of ISL6627 is specifically designed to work with Dual MOSFET Driver for Synchronous Rectified Bridge Intersil VR11.1, VR12 controllers and combined with Advanced Adaptive Zero Shoot-through Protection N-Channel MOSFETs to form a complete core-voltage regulator Programmable Fixed Deadtime for Efficiency Optimization solution for advanced microprocessors. When ISL6627 detects a PSI protocol sent by an Intersil VR11.1, VR12 controller, it Low Standby Bias Current activates Diode Emulation (DE) operation otherwise, it 36V Internal Bootstrap Diode operates in normal Continuous Conduction Mode (CCM) PWM Bootstrap Capacitor Overcharge Prevention mode. Supports High Switching Frequency To further enhance light load efficiency, the ISL6627 enables - 4A Sinking Current Capability diode emulation operation during PSI mode. This allows Discontinuous Conduction Mode (DCM) by detecting when the - Fast Rise/Fall Times and Low Propagation Delays inductor current reaches zero and subsequently turning off the Integrated High-Side Gate-to-Source Resistor to Prevent Self low side MOSFET to prevent it from sinking current. Turn-on Due to High Input Bus dV/dt When ISL6627 detects Diode Braking command from the Power Rails Undervoltage Protection PWM, it turns off both gates and reduces overshoot in load Expandable Bottom Copper Pad for Enhanced Heat Sinking transient situations. Dual Flat 10 Ld (3x3 DFN) Package An advanced adaptive shoot-through protection is integrated to - Near Chip-Scale Package Footprint Improves PCB prevent both the upper and lower MOSFETs from conducting Efficiency and Thinner in Profile simultaneously and to minimize dead time. The user also has the option to program the driver working in fixed propagation Pb-Free (RoHS Compliant) delay mode to optimize the regulator efficiency. The ISL6627 has a 20k integrated high-side gate-to-source resistor to Applications prevent self turn-on due to high input bus dV/dt. High Light Load Efficiency Voltage Regulators Core Regulators for Advanced Microprocessors Related Literature High Current DC/DC Converters Technical Brief TB363 Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices High Frequency and High Efficiency VRM and VRD (SMDs) Technical Brief TB417 Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators BOOT TD UGATE VCC EN 20k SHOOT- PHASE +5V THROUGH POR/ PROTECTION/ CONTROL 33.6k DELAY LOGIC PROGRAMMING PWM LGATE 28.8k GND FIGURE 1. ISL6627 BLOCK DIAGRAM FN6992 Rev 1.00 Page 1 of 11 January 24, 2014ISL6627 Typical Application Circuit VINF +5V +5V BOOT EN UGATE VCC PHASE ISL6627 GND DRIVER PWM DVC FB COMP VCC LGATE PWM1 ISEN1- PSICOMP HFCOMP ISEN1+ VINF +5V VSEN BOOT RGND EN UGATE VTT EN VTT VCC PHASE ISL6627 SVDATA DRIVER GND SVALERT PWM SVCLK PWM2 LGATE VR RDY ISEN2- VR RDYS ISEN2+ PWM3-5 VR HOT ISEN3-5- ISEN3-5+ VINF ISL6367 I2CLK VINF PMALERT BOOT EN PWR CFP I2DATA CPU +5V VINF LOAD VCTRL UGATE VCC CFP PHASE ISL6596 DRIVER GND RAMP ADJ PWM LGATE PWM6 ISEN6- IMON IMONS ISEN6+ FS DRP VIN VINF FSS DRPS R SENIN R RISENIN2 ISENIN1 ISENIN- +5V ISENIN+ +5V +5V BOOT BTS DES TCOMPS +5V EN UGATE BT FDVID TCOMP GND VCC PHASE ISL6627 DRIVER GND +5V ADDR IMAXS TMAX PWM GPU LGATE PWMS LOAD ISENS- NPSI DE IMAX +5V ISENS+ +5V TMS NTC RGNDS VSENS TM HFCOMPS/DVCS NTC AUTO FBS RSET COMPS NTC: BETA = 3477 FN6992 Rev 1.00 Page 2 of 11 January 24, 2014