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ISL6526AIRZ-T Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL6526AIRZ-T Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 15 page 1 ® FN9055.5 ISL6526 Single Synchronous Buck Pulse-Width Modulation (PWM) Controller The ISL6526 makes simple work out of implementing a complete control and protection scheme for a DC-DC stepdown converter. Designed to drive N-Channel MOSFETs in a synchronous buck topology, the ISL6526 integrates the control, output adjustment, monitoring and protection functions into a single package. The ISL6526 provides simple, single feedback loop, voltage- mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over temperature and line voltage variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost and efficiency. 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 cycles range from 0% to 100%. Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor. Features • Operates from 3.3V to 5V Input • 0.8V to VIN Output Range - 0.8V Internal Reference - ±1.5% Over Load, Line Voltage and Temperature • Drives N-Channel MOSFETs • Simple Single-Loop Control Design - Voltage-Mode PWM Control • Fast Transient Response - High-Bandwidth Error Amplifier - Full 0% to 100% Duty Cycle • Lossless, Programmable Overcurrent Protection - Uses Upper MOSFET’s rDS(on) • Converter can Source and Sink Current • Small Converter Size - Internal Fixed Frequency Oscillator - ISL6526: 300kHz - ISL6526A: 600kHz • Internal Soft-Start • 14 Lead SOIC or 16 Lead, 5x5 QFN • QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile • Pb-free Available Applications • Power Supplies for Microprocessors -PCs - Embedded Controllers • Subsystem Power Supplies - PCI/AGP/GTL+ Buses - ACPI Power Control - DDR SDRAM Bus Termination Supply • Cable Modems, Set Top Boxes, and DSL Modems • DSP and Core Communications Processor Supplies • Memory Supplies • Personal Computer Peripherals • Industrial Power Supplies • 3.3V-Input DC-DC Regulators • Low-Voltage Distributed Power Supplies Data Sheet August 2004 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2001-2004. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. |
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