ISL6208ACBZ-T

ISL6208A ® Data Sheet February 15, 2006 High Voltage Synchronous Rectified Buck MOSFET Driver The ISL6208A is a high frequency, dual MOSFET driver, optimized to drive two N-Channel power MOSFETs in a synchronous-rectified buck converter topology. It is especially suited for mobile computing applications that require high efficiency and excellent thermal performance. This driver, combined with an Intersil multiphase Buck PWM controller, forms a complete single-stage core-voltage regulator solution for advanced mobile microprocessors. The ISL6208A features 4A typical sinking current for the lower gate driver. This current is capable of holding the lower MOSFET gate off during the rising edge of the Phase node. This prevents shoot-through power loss caused by the high dv/dt of phase voltages. The operating voltage matches the 30V breakdown voltage of the MOSFETs commonly used in mobile computer power supplies. The ISL6208A also features a three-state PWM input that, working together with Intersil’s multiphase PWM controllers, will prevent negative voltage output during CPU shutdown. This feature eliminates a protective Schottky diode usually seen in a microprocessor power systems. MOSFET gates can be efficiently switched up to 2MHz using the ISL6208A. Each driver is capable of driving a 3000pF load with propagation delays of 15ns and transition times under 10ns. Bootstrapping is implemented with an internal Schottky diode. This reduces system cost and complexity, while allowing the use of higher performance MOSFETs. Adaptive shoot-through protection is integrated to prevent both MOSFETs from conducting simultaneously. A diode emulation feature is integrated in the ISL6208A to enhance converter efficiency at light load conditions. This feature also allows for monotonic start-up into pre-biased outputs. When diode emulation is enabled, the driver will allow discontinuous conduction mode by detecting when the inductor current reaches zero and subsequently turning off the low side MOSFET gate. Programmable dead-time control with gate threshold monitoring is also integrated to prevent both MOSFETs from conducting simultaneously. 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 MLFP Packages” FN9272.0 Features • Dual MOSFET Drives for Synchronous Rectified Bridge • Adaptive Shoot-Through Protection - Active Gate Threshold Monitoring - Programmable Dead-Time • 0.5Ω On-Resistance and 4A Sink Current Capability • Supports High Switching Frequency up to 2MHz - Fast Output Rise and Fall Time - Low Propagation Delay • • • • • • Three-State PWM Input for Power Stage Shutdown Internal Bootstrap Schottky Diode Low Bias Supply Current (5V, 100µA) Diode Emulation for Efficiency and Pre-Biased Startup VCC POR (Power-On-Reset) Feature Integrated Pin-to-pin Compatible with ISL6207, ISL6208, ISL6209 • QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile • Pb-Free Plus Anneal Available (RoHS Compliant) Applications • Supplies for Intel® and AMD® Mobile Microprocessors • High Frequency, Low Profile DC/DC Converters • High Current Low Output Voltage DC/DC Converters • High Input Voltage DC/DC Converters Ordering Information PART NUMBER ISL6208ACBZ (Note) PART MARKING TEMP. RANGE (°C) PACKAGE ISL6208ACBZ -10 to 100 8 Ld SOIC (Pb-Free) PKG. DWG. # M8.15 ISL6208ACBZ-T ISL6208ACBZ 8 Ld SOIC Tape and Reel (Note) (Pb-Free) ISL6208ACRZ (Note) 08AZ ISL6208ACRZ-T 08AZ (Note) -10 to 100 8 Ld 3x3 QFN L8.3x3 (Pb-Free) 8 Ld 3x3 QFN Tape and Reel (Pb-Free) 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. • Technical Brief TB447 “Guidelines for Preventing Boot-toPhase Stress on Half-Bridge MOSFET Driver ICs” 1 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. ISL6208A Pinouts 1 8 PHASE BOOT 2 7 FCCM PWM 3 6 VCC GND 4 5 LGATE PHASE UGATE UGATE ISL6208ACR (8 LD 3x3 QFN) TOP VIEW ISL6208ACB (8 LD SOIC) TOP VIEW 8 7 66 FCCM BOOT 1 PWM 2 3 4 GND LGATE 5 VCC Block Diagram VCC BOOT FCCM UGATE PHASE SHOOTTHROUGH PROTECTION CONTROL LOGIC PWM VCC LGATE 10K GND THERMAL PAD (FOR QFN PACKAGE ONLY) FIGURE 1. BLOCK DIAGRAM Timing Diagram 2.5V PWM tPDHU tPDLU tRU tTSSHD tRU tFU tFU tPTS 1V UGATE LGATE tPTS 1V tRL tFL tTSSHD tPDHL tPDLL tFL 2 FN9272.0 February 15, 2006 ISL6208A Absolute Maximum Ratings Thermal Information Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Input Voltage (VFCCM, VPWM). . . . . . . . . . . . . -0.3V to VCC + 0.3V BOOT Voltage (VBOOT-GND). . . . . . . . . . . . . . . . . . . . . -0.3V to 33V BOOT To PHASE Voltage (VBOOT-PHASE) . . . . . . -0.3V to 7V (DC) -0.3V to 9V (