ISL6561 Data Sheet May 12, 2005 FN9098.5 Multi-Phase PWM Controller with Features Precision r or DCR Differential DS(ON) Precision Multi-Phase Core Voltage Regulation Current Sensing for VR10.X Application - Differential Remote Voltage Sensing The ISL6561 controls microprocessor core voltage regulation - 0.5% System Accuracy Over Life, Load, Line and by driving up to 4 synchronous-rectified buck channels in Temperature parallel. Multi-phase buck converter architecture uses - Adjustable Reference-Voltage Offset interleaved timing to multiply channel ripple frequency and or DCR Current Sensing Precision r DS(ON) reduce input and output ripple currents. Lower ripple results in - Integrated Programmable Temperature Compensation fewer components, lower component cost, reduced power - Accurate Load-Line Programming dissipation, and smaller implementation area. - Accurate Channel-Current Balancing Microprocessor loads can generate load transients with - Differential Current Sense extremely fast edge rates. The ISL6561 features a high - Low-Cost, Lossless Current Sensing bandwidth control loop and ripple frequencies of >4MHz to Internal Shunt Regulator for 5V or 12V Biasing provide optimal response to the transients. Microprocessor Voltage Identification Input Todays microprocessors require a tightly regulated output - Dynamic VID technology voltage position versus load current (droop). The ISL6561 - 6-Bit VID Input senses current by utilizing patented techniques to measure the voltage across the on resistance, r , of the lower - 0.8375V to 1.600V in 12.5mV Steps DS(ON) MOSFETs or DCR of the output inductor during the lower Threshold-Sensitive Enable Function for synchronizing MOSFET conduction intervals. Current sensing provides the with driver POR needed signals for precision droop, channel-current Overcurrent Protection balancing, and overcurrent protection. Overvoltage Protection The accuracy of the current-sensing method is enhanced by - No Additional External Components Needed the ISL6561s temperature compensation function. Droop - OVP Pin to drive opitional Crowbar Device accuracy can be affected by increasing r or DCR with DS(ON) elevated temperature. The ISL6561 uses an internal 2, 3, or 4 Phase Operation temperature-sensing element to provide programmable Greater Than 1MHz Operation (> 4MHz Ripple) temperature compensation. Correctly applied, temperature compensation can completely nullify the effect of r Pb-free Available (RoHS Compliant) DS(ON) or DCR temperature sensitivity. QFN Package Option A unity gain, differential amplifier is provided for remote - QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad voltage sensing. Any potential difference between remote Flat No Leads - Product Outline and local grounds can be completely eliminated using the - QFN Near Chip Scale Package Footprint Improves remote-sense amplifier. Eliminating ground differences PCB Efficiency, Thinner in Profile improves regulation and protection accuracy. The threshold- sensitive enable input is available to accurately coordinate the start up of the ISL6561 with any other voltage rail. Dynamic-VID technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are independent of VID setting. The ISL6561 uses 5V bias and has a built-in shunt regulator to allow 12V bias using only a small external limiting resistor. CAUTION: These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1 1-888-INTERSIL or 321-724-7143 Intersil (and design) is a registered trademark of Intersil Americas Inc. Dynamic VID is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2002-2005. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.ISL6561 Ordering Information (Continued) Ordering Information TEMP. PKG. TEMP. PKG. PART NUMBER (C) PACKAGE DWG PART NUMBER (C) PACKAGE DWG ISL6561IR-T 40 Ld 6x6 QFN Tape and Reel L40.6x6 ISL6561CR 0 to 70 40 Ld 6x6 QFN L40.6x6 ISL6561IRZ (Note) -40 to 85 40 Ld 6x6 QFN (Pb-free) L40.6x6 ISL6561CR-T 40 Ld 6x6 QFN Tape and Reel L40.6x6 ISL6561IRZ-T (Note) 40 Ld 6x6 QFN Tape and Reel L40.6x6 ISL6561CRZ (Note) 0 to 70 40 Ld 6x6 QFN (Pb-free) L40.6x6 (Pb-free) ISL6561CRZ-T (Note) 40 Ld 6x6 QFN Tape and Reel L40.6x6 NOTE: Intersil Pb-free products employ special Pb-free material sets (Pb-free) molding compounds/die attach materials and 100% matte tin plate ISL6561CRZA (Note) 0 to 70 40 Ld 6x6 QFN (Pb-free) L40.6x6 termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are ISL6561CRZA-T 40 Ld 6x6 QFN Tape and Reel L40.6x6 MSL classified at Pb-free peak reflow temperatures that meet or exceed (Note) (Pb-free) the Pb-free requirements of IPC/JEDEC J STD-020. ISL6561IR -40 to 85 40 Ld 6x6 QFN L40.6x6 Pinout ISL6561 (40-PIN QFN) TOP VIEW 40 39 38 37 36 35 34 33 32 31 VID4 1 30 ISEN4+ VID3 2 29 ISEN4- VID2 3 28 ISEN2- VID1 4 27 ISEN2+ VID0 5 26 PWM2 VID12.5 PWM1 6 25 GND ISEN1+ 7 24 OFS 8 23 ISEN1- TCOMP 9 22 ISEN3- DAC 10 21 ISEN3+ 11 12 13 14 15 16 17 18 19 20 FN9098.5 2 May 12, 2005 REF GND GND PGOOD OVP FB IDROOP GND COMP FS VDIFF GND VSEN ENLL RGND EN GND VCC PWM3 PWM4