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The ISL6625A is a high frequency MOSFET driver designed to drive upper and lower power N-Channel MOSFETs in a synchronous rectified buck converter topology.

In ISL6625A, the upper and lower gates are both driven to an externally applied voltage. This provides the capability to optimize applications involving trade-offs between gate charge and conduction losses.

An advanced adaptive shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously and to minimize dead time. The ISL6625A has a 10kΩ integrated high-side gate-to-source resistor to prevent self turn-on due to high input bus dV/dt.

This driver also has an overvoltage protection feature, which is operational while VCC is below the POR threshold. The PHASE node is connected to the gate of the low-side MOSFET (LGATE) via a 30kΩ resistor, limiting the output voltage of the converter close to the gate threshold of the low-side MOSFET. This is dependent on the current being shunted, which provides some protection to the load should the upper MOSFET(s) become shorted.

Key Features

• Dual MOSFET drives for synchronous rectified bridge
• Advanced adaptive zero shoot-through protection
  • PHASE detection
  • LGATE detection
  • Auto-Zero of rDS(ON) conduction offset effect
• Low standby bias current
• 36V internal bootstrap switcher
• Bootstrap capacitor overcharging prevention
• Integrated high-side gate-to-source resistor to prevent from self turn-on due to high input bus dV/dt
• Pre-POR overvoltage protection for start-up and shutdown
• Power rails 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 (RoHS compliant)

Applications

• High light load efficiency voltage regulators
• Core regulators for advanced microprocessors
• High current DC/DC converters