ISL8121 3V to 20V, Two-Phase Buck PWM Controller with Integrated 4A MOSFET Drivers ISL8121 Features Integrated Two-Phase Power Conversion The ISL8121 is a two-phase buck PWM controller featuring an input voltage range of 3V to 20V and Precision Output Voltage Regulation integrated MOSFET drivers. Precision voltage regulation - 0.8% System Accuracy Over-Temperature is provided for point-of-load and other high-current (Industrial) applications that require efficient and compact - Differential Remote Voltage Sensing for Increased implementation. Multiphase buck converter architecture Voltage Sensing Accuracy uses interleaved timing to multiply channel ripple frequency allowing smaller filter inductors and reducing Shunt Regulator for Wide Input Power Conversion input and output ripple currents due to the ripple - 5V and Higher Bias cancellation effect. Lower ripple results in fewer input - Up to 20V Power Down-Conversion and output capacitors. Smaller and low cost transistors can be used resulting from the higher efficiency and Precision Channel Current Sharing reduced power dissipation. - Loss-Less r Current Sampling DS(ON) The ISL8121 offers an internal 0.6V reference with a Integrated High Capable 4A Drivers system regulation accuracy of 0.8% (Industrial 0.6V Internal Reference Temperature range), an optional external reference Full Spectrum Voltage Tracking input, and user-adjustable switching frequency. Unity - Coincidental, Ratiometric, or Offset gain differential amplifier targeted at remote voltage sensing capability enhances the regulation. A power good Sequential Start-up Control signal (PGD) is issued when the output voltage is within Selectable Switching Frequency up to 2MHz Per the regulated window. An internal shunt regulator with Phase optional external connection capability extends the operational input voltage range. For applications Fast Transient Recovery Time requiring voltage tracking or sequencing, the ISL8121 Overcurrent Protection offers a host of possibilities, including coincidental, Overvoltage Protection ratiometric, or offset tracking, as well as sequential start- Capable of Start-up in a Pre-Biased Load ups, user adjustable for a wide range of applications. QFN Packages: Additional features include overvoltage and overcurrent - QFN - Compliant to JEDEC PUB95 MO-220 protection. Overcurrent protection can be tailored to - QFN - Quad Flat No Leads - Package Outline various applications with no need for additional parts. The ISL8121 uses cost and space-saving r sensing - Near Chip Scale Package footprint, which improves DS(ON) for channel current balance, dynamic voltage positioning, PCB efficiency and has a thinner profile and overcurrent protection. Channel current balancing is Pb-Free Available (RoHS Compliant) automatic and accurate with the integrated current- balance control system. Applications General Purpose High Current DC/DC Converters High Current, Low Voltage FPGA/ASIC DC/DC Converters Telecom System October 27, 2009 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 registered trademark of Intersil Americas Inc. FN6352.2 Copyright Intersil Americas Inc. 2006, 2009. All Rights Reserved All other trademarks mentioned are the property of their respective owners.ISL8121 Ordering Information PART NUMBER PART TEMP. RANGE PACKAGE PKG. (Notes 1, 2, 3) MARKING (C) (Pb-Free) DWG. ISL8121IRZ 81 21IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4C NOTES: 1. Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. 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. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL8121. For more information on MSL please see techbrief TB363. Pin Configuration ISL8121 (24 LD QFN) TOP VIEW 24 23 22 21 20 19 VSEN- 1 18 PHASE1 VSEN+ 2 17 ISEN1 VMON 3 16 LG1 25 GND 15 VDIFF 4 PVCC FB 5 14 LG2 COMP 6 13 ISEN2 78 9 1011 12 FN6352.2 2 October 27, 2009 VREG REFTRK VCC SS EN FS BOOT2 PGD UG2 BOOT1 PHASE2 UG1