ISL6522

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 0100% 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)




Application

* Power supply for Pentium^(R) , Pentium Pro, PowerPC^(R) and AlphaPC(TM) microprocessors
* High-power 5V to 3.xV DC-DC regulators
* Low-voltage distributed power supplies




Pinout






Specifications

Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Boot Voltage, VBOOT - VPHASE . . . . . . . . . . . . . . . . . . . . . . +15.0V
Input, Output or I/O Voltage. . . . . . . . . . . .GND -0.3V to VCC +0.3V
ESD Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Class 2




Description

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, 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/s slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0100%. 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.