The ISL6522 provides complete control and protection for a DC-DC converter optimized for high-performance microprocessor applications. It is designed to drive two N-Channel MOSFETs in a synchronous rectified buck topology. The ISL6522 integrates all of the control, output adjustment, monitoring and protection functions into a single package. The output voltage of the converter can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1% over temperature and line voltage variations.
The ISL6522 provides simple, single feedback loop, voltage mode control with fast transient response. It includes a 200kHz free-running triangle-wave oscillator that is adjustable from below 50kHz to over 1MHz. The error amplifier features a 15MHz gain-bandwidth product and 6V/µs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0–100%.
The ISL6522 protects against overcurrent conditions by inhibiting PWM operation. The ISL6522 monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.

Features
• Drives two N-Channel MOSFETs
• Operates from +5V or +12V input
• Simple single-loop control design
   - Voltage-mode PWM control
• Fast transient response
   - High-bandwidth error amplifier
   - Full 0–100% duty ratio
• Excellent output voltage regulation
   - 0.8V internal reference
   - ±1% over line voltage and temperature
• Overcurrent fault monitor
   - Does not require extra current sensing element
   - Uses MOSFETs rDS(ON)
• Converter can source and sink current
• Small converter size
   - Constant frequency operation
   - 200kHz free-running oscillator programmable from 50kHz to over 1MHz
• 14-lead SOIC and TSSOP package and 16-lead 5x5mm QFN Package
• QFN Package
   - Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat No Leads-Product Outline.
   - Near Chip-Scale Package Footprint; Improves PCB Efficiency and Thinner in Profile
• Pb-Free Available (RoHS Compliant)

Applications
• Power supply for Pentium®, Pentium Pro, PowerPC® and AlphaPC™ microprocessors
• High-power 5V to 3.xV DC-DC regulators
• Low-voltage distributed power supplies