PX3511DDDG-RA

PX3511D ® Data Sheet February 26, 2007 Advanced Synchronous Rectified Buck MOSFET Driver with Protection Features The PX3511D is high frequency MOSFET driver specifically designed to drive upper and lower power N-Channel MOSFETs in a synchronous rectified buck converter topology. This driver combined with the PX3511D Digital Multi-Phase Buck PWM controller and N-Channel MOSFETs forms a complete core-voltage regulator solution for advanced microprocessors. The PX3511D drives both upper and lower gates over a range of 4.5V to 13.2V. This drive-voltage provides the flexibility necessary to optimize applications involving tradeoffs between gate charge and conduction losses. An advanced adaptive zero shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously and to minimize the dead time. The PX3511D includes an overvoltage protection feature operational before VCC exceeds its turn-on threshold, at which the PHASE node is connected to the gate of the low side MOSFET (LGATE). The output voltage of the converter is then limited by the threshold of the low side MOSFET, which provides some protection to the microprocessor if the upper MOSFET(s) is shorted. The PX3511D also features an input that recognizes a highimpedance state, working together with Intersil multi-phase PWM controllers to prevent negative transients on the controlled output voltage when operation is suspended. This feature eliminates the need for the schottky diode that may be utilized in a power system to protect the load from negative output voltage damage. Ordering Information PART NUMBER PART (Note) MARKING PX3511DDDG-RA 11DD TEMP. RANGE (°C) Features • Dual MOSFET Drives for Synchronous Rectified Bridge • Pin-to-pin Compatible with ISL6596 • Advanced Adaptive Zero Shoot-Through Protection - Body Diode Detection - Auto-zero of rDS(ON) Conduction Offset Effect • Adjustable Gate Voltage for Optimal Efficiency • 36V Internal Bootstrap Schottky Diode • Bootstrap Capacitor Overcharging Prevention • Supports High Switching Frequency (up to 2MHz) - 3A Sinking Current Capability - Fast Rise/Fall Times and Low Propagation Delays • Optimized for 3.3V PWM Input • Three-State PWM Input for Output Stage Shutdown • Three-State PWM Input Hysteresis for Applications With Power Sequencing Requirement • Pre-POR Overvoltage Protection • 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 Plus Anneal Available (RoHS Compliant) Applications • Optimized for POL DC/DC Converters for IBA Systems • Core Regulators for Intel® and AMD® Microprocessors PACKAGE (Pb-free) PKG. DWG. # 0 to +85 10 Ld 3x3 DFN L10.3X3 Tape and Reel NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are 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. 1 FN6463.0 • 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 TB389 “PCB Land Pattern Design and Surface Mount Guidelines for QFN (MLFP) Packages” CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. PX3511D Pinouts PX3511D (10 LD 3x3 DFN) TOP VIEW 1 UGATE BOOT 2 N/C 3 PWM 4 GND 5 10 PHASE 9 PVCC GND 8 N/C 7 VCC 6 LGATE Block Diagram PX3511D UVCC BOOT VCC UGATE Pre-POR OVP FEATURES +5V 13.6K POR/ PWM SHOOTTHROUGH PROTECTION PHASE (LVCC) PVCC UVCC = PVCC FOR PX3511D CONTROL 6.4K LOGIC LGATE GND PAD 2 FOR DFN DEVICES, THE PAD ON THE BOTTOM SIDE OF THE PACKAGE MUST BE SOLDERED TO THE CIRCUIT’S GROUND. FN6463.0 February 26, 2007 Typical Application - 4 Channel Converter Using ISL6595 and PX3511D Gate Drivers +12V PX3511D +5V 1 UGATE PHASE 8 2 BOOT PVCC 7 3 PWM VCC 6 4 GND LGATE 5 3 +3.3V VDD V12_SEN 1 UGATE PHASE 8 OUT1 2 BOOT PVCC 7 VID4 OUT2 3 PWM VCC 6 VID3 ISEN1 4 GND LGATE 5 VID2 OUT3 ISL6595 VID1 OUT4 VID0 ISEN2 VID5 OUT5 LL0 OUT6 LL1 ISEN3 OUTEN OUT7 OUT8 TO µP VCC_PWRGD Vout PX3511D 1 UGATE PHASE 8 2 BOOT PVCC 7 3 PWM VCC 6 4 GND LGATE 5 RTN ISEN4 OUT9 RESET_N OUT10 PX3511D ISEN5 1 UGATE PHASE 8 PVCC 7 FAULT FAULT1 OUT11 2 BOOT OUTPUTS FAULT2 OUT12 3 PWM VCC 6 ISEN6 4 GND LGATE 5 FN6463.0 February 26, 2007 I2C I/F BUS SDA TEMP_SEN SCL CAL_CUR_EN RTHERM SADDR CAL_CUR_SEN VSENP VSENN PX3511D FROM µP PX3511D GND PX3511D Absolute Maximum Ratings Thermal Information Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V Supply Voltage (PVCC) . . . . . . . . . . . . . . . . . . . . . . . . . VCC + 0.3V BOOT Voltage (VBOOT-GND). . . . . . . . . . . . . . . . . . . . . . . . . . . .36V Input Voltage (VPWM) . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 7V UGATE. . . . . . . . . . . . . . . . . . . VPHASE - 0.3VDC to VBOOT + 0.3V VPHASE - 3.5V (