ISL6615 Datasheet, PDF (1/11 Pages) Intersil Corporation – High-Frequency 6A Sink Synchronous MOSFET Drivers with Protection Features

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Data Sheet
April 24, 2008
ISL6615
FN6481.0
High-Frequency 6A Sink Synchronous
MOSFET Drivers with Protection Features
The ISL6615 is a high-speed MOSFET driver optimized to
drive upper and lower power N-Channel MOSFETs in a
synchronous rectified buck converter topology. This driver,
combined with an Intersil Digital or Analog multiphase PWM
controller, forms a complete high frequency and high
efficiency voltage regulator.
The ISL6615 drives both upper and lower gates over a range
of 4.5V to 13.2V. This drive-voltage provides the flexibility
necessary to optimize applications involving trade-offs
between gate charge and conduction losses.
The ISL6615 features 6A typical sink current for the low-side
gate driver, enhancing the lower MOSFET gate hold-down
capability during PHASE node rising edge, preventing power
loss caused by the self turn-on of the lower MOSFET due to
the high dV/dt of the switching node.
An advanced adaptive zero shoot-through protection is
integrated to prevent both the upper and lower MOSFETs
from conducting simultaneously and to minimize the dead
time. The ISL6615 includes 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 load if
the upper MOSFET(s) is shorted.
The ISL6615 also features an input that recognizes a
high-impedance state, working together with Intersil
multiphase PWM controllers to prevent negative transients
on the controlled output voltage when operation is
suspended. This feature eliminates the need for the Schottky
diode that may be utilized in a power system to protect the
load from negative output voltage damage.
Features
• Dual MOSFET Drives for Synchronous Rectified Bridge
• Advanced Adaptive Zero Shoot-Through Protection
- Body Diode Detection
- LGATE Detection
- Auto-zero of r_DS(ON) Conduction Offset Effect
• Adjustable Gate Voltage for Optimal Efficiency
• 36V Internal Bootstrap Schottky Diode
• Bootstrap Capacitor Overcharging Prevention
• Supports High Switching Frequency (up to 1MHz)
- 6A LGATE Sinking Current Capability
- Fast Rise/Fall Times and Low Propagation Delays
• Support 3.3V PWM Input logic
• Tri-State PWM Input for Safe Output Stage Shutdown
• Tri-State PWM Input Hysteresis for Applications with
Power Sequencing Requirement
• Pre-POR Overvoltage Protection
• VCC Undervoltage Protection
• Expandable Bottom Copper PAD for Better Heat
Spreading
• Dual Flat No-Lead (DFN) Package
- Near Chip-Scale Package Footprint; Improves PCB
Efficiency and Thinner in Profile
• Pb-Free (RoHS Compliant)
Applications
• Optimized for POL DC/DC Converters for IBA Systems
• Core Regulators for Intel® and AMD® Microprocessors
• High Current Low-Profile DC/DC Converters
• High Frequency and High Efficiency VRM and VRD
• Synchronous Rectification for Isolated Power Supplies
Related Literature
Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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