DATASHEET ISL6520A FN9016 Rev 6.00 Single Synchronous Buck Pulse-Width Modulation (PWM) Controller Dec 10, 2009 The ISL6520A makes simple work out of implementing a Features complete control and protection scheme for a DC/DC Operates from +5V Input stepdown converter. Designed to drive N-Channel MOSFETs in a synchronous buck topology, the ISL6520A 0.8V to V Output Range IN integrates the control, output adjustment, monitoring and - 0.8V Internal Reference protection functions into a single 8 Lead package. - 1.5% Over Line Voltage and Temperature The ISL6520A provides simple, single feedback loop, Drives N-Channel MOSFETs voltage-mode control with fast transient response. The Simple Single-Loop Control Design output voltage can be precisely regulated to as low as 0.8V, - Voltage-Mode PWM Control with a maximum tolerance of 1.5% over-temperature and line voltage variations. A fixed frequency oscillator reduces Fast Transient Response design complexity, while balancing typical application cost - High-Bandwidth Error Amplifier and efficiency. - Full 0% to 100% Duty Cycle The error amplifier features a 15MHz gain-bandwidth Lossless, Programmable Overcurrent Protection product and 8V/ms slew rate which enables high converter - Uses Upper MOSFETs r DS(ON) bandwidth for fast transient performance. The resulting Small Converter Size PWM duty cycles range from 0% to 100%. - 300kHz Fixed Frequency Oscillator Protection from overcurrent conditions is provided by - Internal Soft-Start monitoring the r of the upper MOSFET to inhibit PWM DS(ON) - 8 Ld SOIC or 16 Ld 4mmx4mm QFN operation appropriately. This approach simplifies the QFN Package: implementation and improves efficiency by eliminating the - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat need for a current sense resistor. No Leads - Package Outline Pinouts - Near Chip Scale Package footprint, which improves ISL6520A PCB efficiency and has a thinner profile (8 LD SOIC) TOP VIEW Pb-Free (RoHS Compliant) BOOT 1 8 PHASE Applications UGATE 2 7 COMP/SD 6 GND 3 FB Power Supplies for Microprocessors LGATE 4 5 VCC -PCs - Embedded Controllers Subsystem Power Supplies ISL6520A - PCI/AGP/GTL+ Buses (16 LD QFN) TOP VIEW - ACPI Power Control - SSTL-2 and DDR SDRAM Bus Termination Supply Cable Modems, Set Top Boxes, and DSL Modems 16 15 14 13 DSP and Core Communications Processor Supplies BOOT 1 12 NC Memory Supplies UGATE 2 11 COMP/OCSET Personal Computer Peripherals GND 3 10 NC Industrial Power Supplies NC 4 9 FB 5V-Input DC/DC Regulators 576 88 Low-Voltage Distributed Power Supplies FN9016 Rev 6.00 Page 1 of 12 Dec 10, 2009 LGATE NC NC NC VCC PHASE NC NCISL6520A Ordering Information PART NUMBER PART TEMP. RANGE PACKAGE PKG. (Note) MARKING (C) (Pb-free) DWG. ISL6520ACBZ* 6520 ACBZ 0 to +70 8 Ld SOIC M8.15 ISL6520ACBZA* 6520 ACBZ 0 to +70 8 Ld SOIC M8.15 ISL6520AIBZ* 6520 AIBZ -40 to +85 8 Ld SOIC M8.15 ISL6520ACRZ* 65 20ACRZ 0 to +70 16 Ld 4x4mm QFN L16.4x4 ISL6520AIRZ* 65 20AIRZ -40 to +85 16 Ld 4x4mm QFN L16.4x4 ISL6520EVAL1 Evaluation Board *Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. FN9016 Rev 6.00 Page 2 of 12 Dec 10, 2009