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High-Speed, Dual-Phase Driver with Integrated Boost Diodes

High Gate-Drive Strength Provides Extremely Fast Rise and Fall Times, Allowing Designers to Use Either Low-Cost (High Gate Capacitance) MOSFETs or Drive Multiple Parallel MOSFETs in High-Current Applications

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Dual-Phase Synchronous Buck Driver
  • Integrated Bootstrap Diodes
  • Up to 26V System Input Voltage
  • 6A Peak Gate Drive Current
  • Capable of 30A per Phase
  • 0.4Ω/0.9Ω Low-Side, 0.7Ω/1.0Ω High-Side Drivers (typ)
  • Typical 11ns Rise/Fall Times with 3000pF Load
  • Adaptive Dead-Time Control
  • User-Programmable Delay Time
  • Enable Function with 0.04µA (typ) Quiescent Current in Shutdown
  • Space-Saving, Lead-Free, 16-Pin QSOP

Applications/Uses

  • DC-DC Converter Modules
  • Multiphase Buck Converters
  • Processor Core Voltage Regulators
  • Switching Power Supplies
  • Voltage-Regulator Modules (VRMs)

Description

The MAX8811 2-phase gate driver controls power MOSFETs in multiphase synchronous step-down converter applications, providing up to 30A output current per phase. The MAX8811 and MAX8810A (multiphase power-supply controller) combine to provide an efficient, low-cost solution for a wide range of multiphase power-supply applications. The MAX8811 handles system input voltages up to 26V. Each MOSFET driver is capable of driving 3000pF capacitive loads with 11ns typical rise and fall times.

Adaptive shoot-through protection circuitry is implemented to prevent shoot-through currents for the "high-side off to low-side on" transition. A programmable delay is provided for the "low-side off to high-side on" transition. This maximizes overall converter efficiency while supporting operation with a variety of MOSFETs.

The MAX8811 provides an easy upgrade path from the MAX8523 dual driver. Integrated bootstrap diodes reduce external component count, while an enable input provides flexibility for power sequencing. The MAX8811 is available in a space-saving, 16-pin QSOP.

Simplified Block Diagram

MAX8811: Typical Operating Circuit MAX8811: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .