DATASHEET ISL6567 FN9243 Rev 4.00 Multipurpose Two-Phase Buck PWM Controller with Integrated MOSFET Drivers August 9, 2011 The ISL6567 two-phase synchronous buck PWM control IC Features provides a precision voltage regulation system for point-of-load Integrated Two-Phase Power Conversion and other high-current applications requiring an efficient and compact implementation. Multi-phase power conversion is a - Integrated 4A Drivers for High Efficiency marked departure from single phase converter configurations Shunt Regulator for Wide Input Power Conversion employed to satisfy the increasing current demands of various - 5V and Higher Bias electronic circuits. By distributing the power and load current, - Up to 20V Power-Down-Conversion implementation of multi-phase converters utilize smaller and lower cost transistors with fewer input and output capacitors. Precision Channel Current Sharing These reductions accrue from the higher effective conversion - Loss-Less Current Sampling - Uses r DS(ON) frequency with higher frequency ripple current resulting from the phase interleaving inherent to this topology. Precision Output Voltage Regulation - 0.6% System Accuracy Over-Temperature (Commercial Outstanding features of this controller IC include an internal Range) 0.6V reference with a system regulation accuracy of 0.6%, an optional external reference input, and user-adjustable 0.6V Internal Reference switching frequency. Precision regulation is further enhanced Full Spectrum Voltage Tracking by the available unity-gain differential amplifier targeted at - Coincidental, Ratiometric, or Offset remote voltage sensing capability, while output regulation is monitored and its quality is reported via a PGOOD pin. Also Sequential Start-up Control included is an internal shunt regulator with optional external Adjustable Switching Frequency connection capability which extends the operational input voltage range. For applications requiring voltage tracking or - 150kHz to 1.5MHz sequencing, the ISL6567 offers a host of possibilities, Fast Transient Recovery Time including coincidental, ratiometric, or offset tracking, as well Unity-Gain Differential Amplifier as sequential start-ups, user adjustable for a wide range of applications. - Increased Voltage Sensing Accuracy Protection features of this controller IC include overvoltage Overcurrent Protection and overcurrent protection. Overvoltage results in the Overvoltage Protection converter turning the lower MOSFETs ON to clamp the rising Start-up into Pre-Charged Output output voltage. The ISL6567 uses cost and space-saving r sensing for channel current balance, dynamic voltage DS(ON) Small, QFN Package Footprint positioning, and overcurrent protection. Channel current Pb-Free (RoHS Compliant) balancing is automatic and accurate with the integrated current-balance control system. Overcurrent protection can be tailored to various application with no need for additional Ordering Information parts. TEMP. PART NUMBER PART RANGE PACKAGE PKG. (Notes 1, 2, 3) MARKING (C) (Pb-Free) DWG. ISL6567CRZ 65 67CRZ 0 to +70 24 Ld 4x4 QFN L24.4x4C ISL6567IRZ 65 67IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4C NOTE: 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 ISL6567. For more information on MSL please see techbrief TB363. FN9243 Rev 4.00 Page 1 of 26 August 9, 2011ISL6567 Pin Configuration ISL6567 (24 LD QFN) TOP VIEW 24 23 22 21 20 19 RGND 1 18 PHASE1 VSEN 2 17 ISEN1 MON 3 16 LGATE1 25 GND 15 VDIFF 4 PVCC FB 5 14 LGATE2 COMP 6 13 ISEN2 78 9 10 11 12 FN9243 Rev 4.00 Page 2 of 26 August 9, 2011 VREG REFTRK VCC SS EN FS BOOT2 PGOOD UGATE2 BOOT1 PHASE2 UGATE1