DATASHEET ISL6306 FN9226 Rev 1.00 4-Phase PWM Controller with 8-Bit DAC Code Capable of Precision rDS(ON) or May 5, 2008 DCR Differential Current Sensing The ISL6306 controls microprocessor core voltage regulation Features by driving up to 4 synchronous-rectified buck channels in Precision Multiphase Core Voltage Regulation parallel. Multiphase buck converter architecture uses - Differential Remote Voltage Sensing interleaved timing to multiply channel ripple frequency and reduce input and output ripple currents. Lower ripple results in - 0.5% System Accuracy Over Life, Load, Line and fewer components, lower component cost, reduced power Temperature dissipation, and smaller implementation area. - Adjustable Precision Reference-Voltage Offset Microprocessor loads can generate load transients with Precision r or DCR Current Sensing DS(ON) extremely fast edge rates. The ISL6306 features a high - Accurate Load-Line Programming bandwidth control loop and ripple frequencies up to >4MHz to - Accurate Channel-Current Balancing provide optimal response to the transients. - Differential Current Sense Todays microprocessors require a tightly regulated output Microprocessor Voltage Identification Input voltage position versus load current (droop). The ISL6306 senses current by utilizing patented techniques to measure - Dynamic VID Technology the voltage across the on resistance, r , of the lower - 8-Bit VID Input with Selectable VR11 Code and DS(ON) MOSFETs or DCR of the output inductor during the lower Extended VR10 Code at 6.25mV per Bit MOSFET conduction intervals. Current sensing provides the - 0.5V to 1.6V Operation Range needed signals for precision droop, channel-current Thermal Monitoring balancing, and overcurrent protection. A programmable internal temperature compensation function is implemented to Integrated Programmable Temperature Compensation effectively compensate for the temperature coefficient of the Threshold-Sensitive Enable Function for Power current sense element. Sequencing and VTT Enable A unity gain, differential amplifier is provided for remote Overcurrent Protection voltage sensing. Any potential difference between remote and local grounds can be completely eliminated using the remote- Overvoltage Protection sense amplifier. Eliminating ground differences improves 2-, 3- or 4-Phase Operation regulation and protection accuracy. The threshold-sensitive enable input is available to accurately coordinate the start up Adjustable Switching Frequency Up to 1MHz Per Phase of the ISL6306 with any other voltage rail. Dynamic-VID Package Option technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are - QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad independent of VID setting. Flat No Leads - Product Outline - QFN Near Chip Scale Package Footprint Improves Ordering Information PCB Efficiency, Thinner in Profile PART NUMBER PART TEMP. PACKAGE PKG. Pb-Free (RoHS Compliant) (Note) MARKING (C) (Pb-Free) DWG. ISL6306CRZ* ISL6306 CRZ 0 to +70 40 Ld 6x6 QFN L40.6x6 ISL6306CRZ-TK ISL6306 CRZ 0 to +70 40 Ld 6x6 QFN L40.6x6 ISL6306IRZ* ISL6306 IRZ -40 to +85 40 Ld 6x6 QFN L40.6x6 *Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: 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. FN9226 Rev 1.00 Page 1 of 33 May 5, 2008ISL6306 Pinout ISL6306 (40 LD QFN) TOP VIEW 40 39 38 37 36 35 34 33 32 31 1 VID6 30 ISEN3+ VID5 2 29 ISEN3- VID4 3 28 ISEN2- VID3 4 27 ISEN2+ VID2 5 26 PWM2 GND VID1 6 25 PWM4 VID0 7 24 ISEN4+ VRSEL 8 23 ISEN4- OFS 9 22 ISEN1- 10 21 DAC ISEN1+ 11 12 13 14 15 16 17 18 19 20 FN9226 Rev 1.00 Page 2 of 33 May 5, 2008 REF VID7 COMP TM FB VR HOT IDROOP VR FAN VDIFF VR RDY RGND SS VSEN FS TCOMP EN VTT V EN PWR CC PWM1 PWM3