ISL6594A

Advanced Synchronous Buck MOSFET Driver with 3V PWM Interface and Advanced Protection Features

OVERVIEW

The ISL6594A and ISL6594B are high frequency MOSFET drivers specifically designed to drive upper and lower power N-Channel MOSFETs in a synchronous rectified buck converter topology. These drivers combined with the ISL6592 Digital Multi-Phase Buck PWM controller and N-Channel MOSFETs form a complete core-voltage regulator solution for advanced microprocessors.

The ISL6594A drives the upper gate to 12V, while the lower gate can be independently driven over a range from 5V to 12V. The ISL6594B drives both upper and lower gates over a range of 5V to 12V. This drive-voltage provides the flexibility necessary to optimize applications involving trade-offs between gate charge and conduction losses.

An adaptive zero shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously and to minimize the dead time. These products add 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 during initial start-up.

These drivers also feature a three-state PWM input which, working together with Intersil's multi-phase PWM controllers, prevents a negative transient on the output voltage when the output is shut down. This feature eliminates the Schottky diode that is used in some systems for protecting the load from reversed output voltage events.

KEY FEATURES

  • Dual MOSFET Drives for Synchronous Rectified Bridge
  • Adjustable Gate Voltage (5V to 12V) 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
  • 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 Available (RoHS Compliant)

PARAMETRICS

Parameters
ISL6594A
Basic Information
Production Status
Mass Production
VIN/VPWM (max) (V)
GND - 0.3V to 7V
VDRIVE (V)
5 or 12
Output Per Driver UGATE Source|Sink (A)
1.25|2
Output Per Driver LGATE Source|Sink (A)
2|3
Phase Voltage Min (V)
GND - 0.3VDC GND - 8V (<400ns)
Phase Voltage Max (V)
15VDC, 30V (<200ns)
No Load IS (max) (mA)
2.5
IS
8 mA
Qualification Level
Standard
Temperature Range
0 to +70

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