The ISL6522B 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 ISL6522B 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 ISL6522B 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 ISL6522B protects against overcurrent conditions by inhibiting PWM operation. The ISL6522B monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.


  • 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
  • Pre-Biased Load Start Up
  • Small converter size
  • Constant frequency operation
  • 200kHz free-running oscillator programmable from 50kHz to over 1MHz
  • 14-lead SOIC 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)




  • Power supply for Pentium®, Pentium Pro, PowerPC® and AlphaPC microprocessors
  • FPGA Core DC/DC Converters
  • Low-voltage distributed power supplies


Type Title Date
Datasheet PDF 822 KB
Brochure PDF 5.49 MB 日本語
Product Change Notice PDF 169 KB
End Of Life Notice PDF 320 KB
Product Change Notice PDF 152 KB
Application Note PDF 509 KB
Application Note PDF 397 KB
7 items

Design & Development