The ISL6627 is a high frequency MOSFET driver designed to drive

upper and lower power N-Channel MOSFETs in a synchronous

rectified buck converter topology. The advanced PWM protocol of

ISL6627 is specifically designed to work with Intersil VR11.1,

VR12 controllers and combined with N-Channel MOSFETs to form

a complete core-voltage regulator solution for advanced

microprocessors. When ISL6627 detects a PSI protocol sent by

an Intersil VR11.1, VR12 controller, it activates Diode Emulation

(DE) operation; otherwise, it operates in normal Continuous

Conduction Mode (CCM) PWM mode.

To further enhance light load efficiency, the ISL6627 enables

diode emulation operation during PSI mode. This allows

Discontinuous Conduction Mode (DCM) by detecting when the

inductor current reaches zero and subsequently turning off the

low side MOSFET to prevent it from sinking current.

When ISL6627 detects Diode Braking command from the PWM,

it turns off both gates and reduces overshoot in load transient

situations.

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 user also has the

option to program the driver working in fixed propagation delay

mode to optimize the regulator efficiency. The ISL6627 has a

20k? integrated high-side gate-to-source resistor to prevent self

turn-on due to high input bus dV/dt.

特性 Features

? Intersil VR11.1 and VR12 Compatible

? Dual MOSFET Driver for Synchronous Rectified Bridge

? Advanced Adaptive Zero Shoot-through Protection

? Programmable Fixed Deadtime for Efficiency Optimization

? Low Standby Bias Current

? 36V Internal Bootstrap Diode

? Bootstrap Capacitor Overcharge Prevention

? Supports High Switching Frequency

- 4A Sinking Current Capability

- Fast Rise/Fall Times and Low Propagation Delays

? Integrated High-Side Gate-to-Source Resistor to Prevent Self

Turn-on Due to High Input Bus dV/dt

? Power Rails Undervoltage Protection

? Expandable Bottom Copper Pad for Enhanced Heat Sinking

? Dual Flat 10 Ld (3x3 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

? High Frequency and High Efficiency VRM and VRD