DATASHEET ISL6520B FN9083 Rev 3.00 Single Synchronous Buck Pulse-Width Modulation (PWM) Controller Jul 23, 2007 The ISL6520B makes simple work out of implementing a Features complete control scheme for a DC/DC stepdown converter. Operates from +5V Input Designed to drive N-channel MOSFETs in a synchronous buck topology, the ISL6520B integrates the control, output 0.8V to V Output Range IN adjustment and monitoring functions into a single 8 Lead - 0.8V Internal Reference package. - 1.5% Over Line Voltage and Temperature The ISL6520B 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 Small Converter Size product and 8V/s slew rate which enables high converter - 300kHz Fixed Frequency Oscillator bandwidth for fast transient performance. The resulting - Internal Soft Start PWM duty cycles range from 0% to 100%. - 8 Ld SOIC or 16Ld 4mmx4mm QFN Ordering Information QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat TEMP. No Leads - Package Outline PART PART RANGE PKG. NUMBER MARKING (C) PACKAGE DWG. - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile ISL6520BCB* 6520 BCB 0 to +70 8 Ld SOIC M8.15 Pb-free Plus Anneal Available (RoHS compliant) ISL6520BCBZ* 6520 BCBZ 0 to +70 8 Ld SOIC M8.15 (Note) (Pb-free) Applications ISL6520BCR* 65 20BCR 0 to +70 16 Ld 4x4 QFN L16.4x4 Power Supplies for Microprocessors ISL6520BCRZ* 65 20BCRZ 0 to +70 16 Ld 4x4 QFN L16.4x4 (Note) (Pb-free) -PCs ISL6520BIR* 65 20BIR -40 to +85 16 Ld 4x4 QFN L16.4x4 - Embedded Controllers ISL6520BIRZ* 65 20BIRZ -40 to +85 16 Ld 4x4 QFN L16.4x4 Subsystem Power Supplies (Note) (Pb-free) - PCI/AGP/GTL+ Buses ISL6520EVAL1 Evaluation Board - ACPI Power Control *Add -T suffix for tape and reel. Please refer to TB347 for details - SSTL-2 and DDR SDRAM Bus Termination Supply on reel specifications. Cable Modems, Set-Top Boxes, and DSL Modems NOTE: Intersil Pb-free products employ special Pb-free material sets molding compounds/die attach materials and 100% matte tin DSP and Core Communications Processor Supplies plate termination finish, which are RoHS compliant and compatible Memory Supplies with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that Personal Computer Peripherals meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Industrial Power Supplies 5V-Input DC/DC Regulators Low-Voltage Distributed Power Supplies FN9083 Rev 3.00 Page 1 of 11 Jul 23, 2007ISL6520B Pinouts ISL6520B ISL6520B (16 LD QFN) (8 LD SOIC) TOP VIEW TOP VIEW BOOT 1 8 PHASE UGATE 2 7 COMP/SD 16 15 14 13 GND 3 6 FB 5 BOOT LGATE 4 VCC NC 1 12 UGATE 2 11 COMP/SD GND 3 10 NC 4 9 NC FB 576 8 Block Diagram VCC POR AND BOOT SOFTSTART UGATE PHASE + PWM ERROR COMPARATOR AMP 0.8V GATE + - CONTROL + - LOGIC - PWM VCC FB LGATE COMP/SD 20A OSCILLATOR FIXED 300kHz GND Typical Application V IN 5V C D DCPL BOOT R PULLUP VCC C C BULK HF BOOT 5 1 C BOOT UGATE Q COMP/SD U 2 7 ISL6520B SHUTDOWN L PHASE OUT V 8 OUT R F C I LGATE Q L 4 C 63 OUT C F FB GND R OFFSET R S FN9083 Rev 3.00 Page 2 of 11 Jul 23, 2007 INHIBIT LGATE NC NC NC VCC PHASE NC NC