Overview

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.

ISL6625A Functional Diagram
ISL6625A Functional Diagram
  • 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

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

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    Price (USD) | 1ku
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    Part Number
    ISL6625ACRZ-T
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    		DFN Reel 3 1.57
    ISL6625ACRZ-TK
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    		DFN Reel 3
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