DATASHEET ISL6561 FN9098 Rev 6.00 Multi-Phase PWM Controller with Precision r or DCR Differential Current DS(ON) November 10, 2015 Sensing for VR10.X Application The ISL6561 controls microprocessor core voltage regulation Features by driving up to 4 synchronous-rectified buck channels in Precision Multi-Phase Core Voltage Regulation parallel. Multi-phase buck converter architecture uses - Differential Remote Voltage Sensing interleaved timing to multiply channel ripple frequency and - 0.5% System Accuracy Over Life, Load, Line and reduce input and output ripple currents. Lower ripple results in Temperature fewer components, lower component cost, reduced power - Adjustable Reference-Voltage Offset dissipation, and smaller implementation area. Precision r or DCR Current Sensing DS(ON) Microprocessor loads can generate load transients with - Integrated Programmable Temperature Compensation extremely fast edge rates. The ISL6561 features a high - Accurate Load-Line Programming bandwidth control loop and ripple frequencies of >4MHz to provide optimal response to the transients. - Accurate Channel-Current Balancing - Differential Current Sense Todays microprocessors require a tightly regulated output - Low-Cost, Lossless Current Sensing voltage position versus load current (droop). The ISL6561 senses current by utilizing patented techniques to measure Internal Shunt Regulator for 5V or 12V Biasing the voltage across the on resistance, r , of the lower DS(ON) Microprocessor Voltage Identification Input MOSFETs or DCR of the output inductor during the lower - Dynamic VID technology MOSFET conduction intervals. Current sensing provides the - 6-Bit VID Input needed signals for precision droop, channel-current - 0.8375V to 1.600V in 12.5mV Steps balancing, and overcurrent protection. Threshold-Sensitive Enable Function for synchronizing The accuracy of the current-sensing method is enhanced by with driver POR the ISL6561s temperature compensation function. Droop accuracy can be affected by increasing r or DCR with Overcurrent Protection DS(ON) elevated temperature. The ISL6561 uses an internal Overvoltage Protection temperature-sensing element to provide programmable - No Additional External Components Needed temperature compensation. Correctly applied, temperature - OVP Pin to drive opitional Crowbar Device compensation can completely nullify the effect of r DS(ON) or DCR temperature sensitivity. 2, 3, or 4 Phase Operation Greater Than 1MHz Operation (> 4MHz Ripple) A unity gain, differential amplifier is provided for remote voltage sensing. Any potential difference between remote Pb-free Available (RoHS Compliant) and local grounds can be completely eliminated using the QFN Package Option remote-sense amplifier. Eliminating ground differences - QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad improves regulation and protection accuracy. The threshold- Flat No Leads - Product Outline sensitive enable input is available to accurately coordinate - QFN Near Chip Scale Package Footprint Improves the start up of the ISL6561 with any other voltage rail. PCB Efficiency, Thinner in Profile 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. FN9098 Rev 6.00 Page 1 of 27 November 10, 2015ISL6561 Ordering Information TEMP. PACKAGE PKG. PART NUMBER (C) (RoHS Compliant) DWG ISL6561IRZ (Note) -40 to 85 40 Ld 6x6 QFN (Pb-free) L40.6x6 ISL6561IRZ-T (Note) 40 Ld 6x6 QFN Tape and Reel L40.6x6 (Pb-free) 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. 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- 4 27 VID1 ISEN2+ 5 26 VID0 PWM2 VID12.5 6 25 PWM1 GND 7 24 ISEN1+ OFS 8 23 ISEN1- TCOMP 9 22 ISEN3- DAC 10 21 ISEN3+ 11 12 13 14 15 16 17 18 19 20 FN9098 Rev 6.00 Page 2 of 27 November 10, 2015 REF GND GND PGOOD OVP FB IDROOP GND COMP FS VDIFF GND VSEN ENLL RGND EN GND VCC PWM3 PWM4