The ISL6608 is a high frequency, MOSFET driver optimized to drive two N-Channel power MOSFETs in a synchronous-rectified buck converter topology. This driver combined with an Intersil HIP63xx or ISL65xx Multiphase Buck PWM controller forms a complete single-stage core-voltage regulator solution with high efficiency performance at high switching frequency for advanced microprocessors. The IC is biased by a single low voltage supply (5V) and minimizes gate drive losses due to MOSFET gate charge at high switching frequency applications. Each driver is capable of driving a 3000pF load with a low propagation delay and less than 10ns transition time. This product implements bootstrapping on the upper gate with an internal bootstrap Schottky diode, reducing implementation cost, complexity, and allowing the use of higher performance, cost effective N-Channel MOSFETs. Adaptive shoot-through protection is integrated to prevent both MOSFETs from conducting simultaneously. The ISL6608 features 4A sink current for the lower gate driver, which is capable of holding the lower MOSFET gate during the Phase node rising edge to prevent shoot-through power loss caused by the high dv/dt of the Phase node. The ISL6608 also features a Three-State PWM input which, working together with Intersil Multiphase PWM controllers, will prevent a negative transient on the output voltage when the output is shut down. This feature eliminates the Schottky diode that is usually seen in a microprocessor power system for protecting the microprocessor from reversed output voltage events. A diode emulation feature is integrated in the ISL6608 to enhance converter efficiency at light load conditions. Diode emulation also prevents a negative transient when starting up with a pre-biased voltage on the output. When diode emulation is enabled, the driver allows discontinuous conduction mode by detecting when the inductor current reaches zero and subsequently turns off the low side MOSFET, which prevents the output from sinking current and producing a negative transient on a pre-biased output (see Figures 6 and 7 on page 7).

Features

  • Dual MOSFET Drives for Synchronous Rectified Bridge
  • Adaptive Shoot-Through Protection
  • 0.5Ω On-Resistance and 4A Sink Current Capability
  • Supports High Switching Frequency up to 2MHz
  • Fast Output Rise/Fall Time and Low Propagation Delay
  • Three-State PWM Input for Power Stage Shutdown
  • Internal Bootstrap Schottky Diode
  • Low Bias Supply Current (5V, 80µA)
  • Diode Emulation for Enhanced Light Load Efficiency and Pre-Biased Startup Applications
  • VCC POR (Power-On-Reset) Feature Integrated
  • Low Three-State Shutdown Holdoff Time (Typically 160ns)
  • Pin-to-Pin Compatible with ISL6605
  • 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 Available as an Option

Applications

  • Core Voltage Supplies for FPGAs and PowerPC Microprocessors
  • Point-Of-Load Modules with Pre-Biased Start-Up Requirements
  • High Frequency and High Current DC-DC Converters

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active SOICN Tube 980
Availability
Active SOICN Reel 2500
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL6608 Datasheet Datasheet PDF 602 KB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1116: CMOS Applications Information Application Note PDF 576 KB
PCNs & PDNs
PCN14036 - Wafer fabrication Site Change for Listed Intersil Products - Palm Bay, Florida Product Change Notice PDF 294 KB
PCN12068 - SOIC w/ Copper Bond Wire @ ASECL as Alternate Assembly Site Product Change Notice PDF 108 KB
Other
TB363: Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs) Other PDF 293 KB
PA16061 - Introduce New T-type End Plug for n-SOIC rail (packing tube) Product Advisory PDF 106 KB
TB458: Converting a Fixed PWM to an Adjustable PWM Other PDF 315 KB
TB389: PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages Other PDF 958 KB