ISL6597
Dual Synchronous Rectified MOSFET Drivers
Key Features
- 5V Quad N-Channel MOSFET Drives for Two Synchronous Rectified Bridges
- Adaptive Shoot-Through Protection
- Programmable Deadtime for Efficiency Optimization
- 0.4Ω On-Resistance and 4A Sink Current Capability
- Supports High Switching Frequency
- Fast Output Rise and Fall
- Ultra Low Tri-State Hold-Off Time (20ns)
- Low VF Internal Bootstrap Diode
- Low Bias Supply Current
- Support 3.3V and 5V PWM Input
- Enable Input and Power-On Reset
- QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat No Leads-Product Outline
- Near Chip-Scale Package Footprint; Improves PCB Utilization and Thinner in Profile
- Pb-Free Plus Anneal Available (RoHS Compliant)
Description
The ISL6597 integrates two ISL6596 drivers and is optimized to drive two independent power channels in a synchronous-rectified buck converter topology. These drivers, combined with an Intersil multiphase PWM controller, form a complete high efficiency voltage regulator solution.
The IC is biased by a single low voltage supply (5V), minimizing driver switching losses in high MOSFET gate capacitance and high switching frequency applications. Each driver is capable of driving a 3nF load with less than 10ns rise/fall time. Bootstrapping of the upper gate driver is implemented via an internal low forward drop diode, reducing implementation cost, complexity, and allowing the use of higher performance, cost effective N-Channel MOSFETs. Adaptive shoot-through protection is integrated to prevent both MOSFETs from conducting simultaneously.
The ISL6597 features 4A typical sink current for the lower 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.
The ISL6597 also features an input that recognizes a high impedance state, working together with Intersil multi-phase 3.3V or 5V 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.
Applications
- Core Voltage Supplies for Intel® and AMD® Microprocessors
- High Frequency Low Profile High Efficiency DC/DC Converters
- High Current Low Voltage DC/DC Converters
- Synchronous Rectification for Isolated Power Supplies
