ISL6522B中文资料Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller数据手册Renesas规格书

描述 Description

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, voltagemode 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.

特性 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
• 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)

应用 Application

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