ISL6520BCBZ

DATASHEET ISL6520B FN9083 Rev 3.00 Jul 23, 2007 Single Synchronous Buck Pulse-Width Modulation (PWM) Controller The ISL6520B makes simple work out of implementing a complete control scheme for a DC/DC stepdown converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, the ISL6520B integrates the control, output adjustment and monitoring functions into a single 8 Lead package. Features The ISL6520B 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. • Drives N-Channel MOSFETs The error amplifier features a 15MHz gain-bandwidth product and 8V/s slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%. • Operates from +5V Input • 0.8V to VIN Output Range - 0.8V Internal Reference - ±1.5% Over Line Voltage and Temperature • Simple Single-Loop Control Design - Voltage-Mode PWM Control • Fast Transient Response - High-Bandwidth Error Amplifier - Full 0% to 100% Duty Cycle PART MARKING TEMP. RANGE (°C) 6520 BCB 0 to +70 8 Ld SOIC M8.15 • Small Converter Size - 300kHz Fixed Frequency Oscillator - Internal Soft Start - 8 Ld SOIC or 16Ld 4mmx4mm 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 ISL6520BCBZ* 6520 BCBZ 0 to +70 8 Ld SOIC (Note) (Pb-free) M8.15 • Pb-free Plus Anneal Available (RoHS compliant) Ordering Information PART NUMBER ISL6520BCB* ISL6520BCR* 65 20BCR PACKAGE PKG. DWG. # 0 to +70 16 Ld 4x4 QFN L16.4x4 ISL6520BCRZ* 65 20BCRZ 0 to +70 16 Ld 4x4 QFN L16.4x4 (Note) (Pb-free) ISL6520BIR* 65 20BIR -40 to +85 16 Ld 4x4 QFN L16.4x4 ISL6520BIRZ* 65 20BIRZ -40 to +85 16 Ld 4x4 QFN L16.4x4 (Note) (Pb-free) ISL6520EVAL1 Evaluation Board *Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are 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. Applications • Power Supplies for Microprocessors - PCs - Embedded Controllers • Subsystem Power Supplies - PCI/AGP/GTL+ Buses - ACPI Power Control - SSTL-2 and 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 • 5V-Input DC/DC Regulators • Low-Voltage Distributed Power Supplies FN9083 Rev 3.00 Jul 23, 2007 Page 1 of 11 ISL6520B Pinouts ISL6520B (16 LD QFN) TOP VIEW NC 16 15 14 13 2 11 COMP/SD GND 3 10 NC NC 4 9 5 6 7 8 NC UGATE VCC 12 NC NC 1 LGATE BOOT 5 VCC LGATE 4 PHASE 7 COMP/SD 6 FB GND 3 NC 8 PHASE BOOT 1 UGATE 2 NC ISL6520B (8 LD SOIC) TOP VIEW FB Block Diagram VCC POR AND SOFTSTART BOOT UGATE + 0.8V PWM COMPARATOR ERROR AMP + - INHIBIT PHASE - GATE CONTROL LOGIC PWM + - VCC FB LGATE COMP/SD 20A OSCILLATOR FIXED 300kHz GND Typical Application VIN 5V CDCPL DBOOT RPULLUP VCC 5 COMP/SD SHUTDOWN 7 2 ISL6520B RF CI CF 6 FB 1 3 8 4 CBULK CHF BOOT CBOOT QU UGATE LOUT PHASE QL LGATE VOUT COUT GND ROFFSET RS FN9083 Rev 3.00 Jul 23, 2007 Page 2 of 11 ISL6520B Absolute Maximum Ratings Thermal Information Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.0V Absolute Boot Voltage, VBOOT . . . . . . . . . . . . . . . . . . . . . . . +15.0V Upper Driver Supply Voltage, VBOOT - VPHASE . . . . . . . . 7.0V (DC) 8.0V (