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.

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