ISL6522 Data Sheet March 10, 2006 FN9030.8 Buck and Synchronous Rectifier Features Pulse-Width Modulator (PWM) Controller Drives two N-Channel MOSFETs The ISL6522 provides complete control and protection for a Operates from +5V or +12V input DC-DC converter optimized for high-performance micro- Simple single-loop control design processor applications. It is designed to drive two N-Channel MOSFETs in a synchronous rectified buck topology. The - Voltage-mode PWM control ISL6522 integrates all of the control, output adjustment, Fast transient response monitoring and protection functions into a single package. - High-bandwidth error amplifier The output voltage of the converter can be precisely - Full 0100% duty ratio regulated to as low as 0.8V, with a maximum tolerance of Excellent output voltage regulation 1% over temperature and line voltage variations. - 0.8V internal reference The ISL6522 provides simple, single feedback loop, voltage- - 1% over line voltage and temperature mode control with fast transient response. It includes a Overcurrent fault monitor 200kHz free-running triangle-wave oscillator that is - Does not require extra current sensing element adjustable from below 50kHz to over 1MHz. The error - Uses MOSFETs r DS(ON) amplifier features a 15MHz gain-bandwidth product and 6V/ s slew rate which enables high converter bandwidth for Converter can source and sink current fast transient performance. The resulting PWM duty ratio Small converter size ranges from 0100%. - Constant frequency operation - 200kHz free-running oscillator programmable from The ISL6522 protects against overcurrent conditions by 50kHz to over 1MHz inhibiting PWM operation. The ISL6522 monitors the current by using the r of the upper MOSFET which eliminates DS(ON) 14-lead SOIC and TSSOP package and 16-lead 5x5mm the need for a current sensing resistor. QFN Package QFN Package SOIC, TSSOP Pinouts - Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat TOP VIEW No Leads-Product Outline. 14 RT 1 VCC - Near Chip-Scale Package Footprint Improves PCB 13 OCSET 2 PVCC Efficiency and Thinner in Profile SS 3 12 LGATE Pb-free plus anneal available (RoHS compliant) 11 COMP 4 PGND 10 FB 5 BOOT Applications 9 EN 6 UGATE Power supply for Pentium , Pentium Pro, PowerPC and 8 GND 7 PHASE AlphaPC microprocessors QFN High-power 5V to 3.xV DC-DC regulators TOP VIEW Low-voltage distributed power supplies 16 15 14 13 1 12 SS PVCC COMP 2 11 LGATE GND FB 3 10 PGND EN 4 9 BOOT 576 8 CAUTION: These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1 1-888-INTERSIL or 1-888-468-3774 Intersil (and design) is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2001, 2002, 2004-2006. All Rights Reserved PowerPC is a trademark of IBM. AlphaPC is a trademark of Digital Equipment Corporation. Pentium is a registered trademark of Intel Corporation. FOR NEW DESIGNS, INTERSIL RECOMMENDS DROP-IN ENHANCED PRODUCT - ISL6535 NC NC GND OCSET PHASE RT VCC UGATEISL6522 Ordering Information Ordering Information (Continued) PART PART TEMP. PKG. PART PART TEMP. PKG. NUMBER MARKING RANGE (C) PACKAGE DWG. NUMBER MARKING RANGE (C) PACKAGE DWG. ISL6522CB ISL6522CB 0 to 70 14 Ld SOIC M14.15 ISL6522CR ISL6522CR 0 to 70 16 Ld 5x5 QFN L16.5x5B ISL6522CBZ 6522CBZ 0 to 70 14 Ld SOIC M14.15 ISL6522CRZ ISL6522CRZ 0 to 70 16 Ld 5x5 QFN L16.5x5B (Note) (Pb-free) (Note) (Pb-free) ISL6522CBZA 6522CBZ 0 to 70 14 Ld SOIC M14.15 ISL6522IR ISL6522IR -40 to 85 16 Ld 5x5 QFN L16.5x5B (Note) (Pb-free) ISL6522IRZ ISL6522IRZ -40 to 85 16 Ld 5x5 QFN L16.5x5B ISL6522IB ISL6522IB -40 to 85 14 Ld SOIC M14.15 (Note) (Pb-free) ISL6522IBZ 6522IBZ -40 to 85 14 Ld SOIC M14.15 NOTE: Intersil Pb-free plus anneal products employ special Pb-free (Note) (Pb-free) material sets molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible ISL6522CV ISL6522CV 0 to 70 14 Ld TSSOP M14.173 with both SnPb and Pb-free soldering operations. Intersil Pb-free ISL6522CVZ ISL6522CVZ 0 to 70 14 Ld TSSOP M14.173 products are MSL classified at Pb-free peak reflow temperatures that (Note) (Pb-free) meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. ISL6522IV ISL6522IV -40 to 85 14 Ld TSSOP M14.173 Add -T for tape and reel. ISL6522IVZ ISL6522IVZ -40 to 85 14 Ld TSSOP M14.173 (Note) (Pb-free) Typical Application 12V +5V OR +12V V CC OCSET SS MONITOR AND EN PROTECTION BOOT RT OSC UGATE PHASE ISL6522 +V O REF +12V PV CC LGATE - + + FB PGND - COMP GND FN9030.8 2 March 10, 2006