ISL6326CRZ Renesas

DATASHEET ISL6326 FN9262 Rev 1.00 4-Phase PWM Controller with 8-Bit DAC Code Capable of Precision DCR May 5, 2008 Differential Current Sensing The ISL6326 controls microprocessor core voltage regulation Features by driving up to 4 synchronous-rectified buck channels in Proprietary Active Pulse Positioning and Adaptive Phase parallel. Multiphase buck converter architecture uses Alignment Modulation Scheme interleaved timing to multiply channel ripple frequency and reduce input and output ripple currents. Lower ripple results in Precision Multiphase Core Voltage Regulation fewer components, lower component cost, reduced power - Differential Remote Voltage Sensing dissipation, and smaller implementation area. - 0.5% System Accuracy Over Life, Load, Line and Temperature Microprocessor loads can generate load transients with - Adjustable Precision Reference-Voltage Offset extremely fast edge rates. The ISL6326 utilizes Intersils proprietary Active Pulse Positioning (APP) and Adaptive Precision Resistor or DCR Current Sensing Phase Alignment (APA) modulation scheme to achieve the - Accurate Load-Line Programming extremely fast transient response with fewer output capacitors. - Accurate Channel-Current Balancing - Differential Current Sense Todays microprocessors require a tightly regulated output voltage position versus load current (droop). The ISL6326 Microprocessor Voltage Identification Input senses the output current continuously by utilizing patented - Dynamic VID Technology techniques to measure the voltage across the dedicated - 8-Bit VID Input with Selectable VR11 Code and current sense resistor or the DCR of the output inductor. Extended VR10 Code at 6.25mV Per Bit Current sensing provides the needed signals for precision Thermal Monitoring droop, channel-current balancing, and overcurrent protection. A programmable integrated temperature Integrated Programmable Temperature Compensation compensation function is implemented to effectively Overcurrent Protection and Channel Current Limit compensate for the temperature coefficient of the current sense element. The current limit function provides the Overvoltage Protection overcurrent protection for the individual phase. 2-, 3- or 4-Phase Operation A unity gain, differential amplifier is provided for remote Adjustable Switching Frequency up to 1MHz Per Phase voltage sensing. Any potential difference between remote Package Option and local grounds can be completely eliminated using the - QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad remote-sense amplifier. Eliminating ground differences Flat No Leads - Product Outline improves regulation and protection accuracy. The threshold- - QFN Near Chip Scale Package Footprint Improves sensitive enable input is available to accurately coordinate PCB Efficiency, Thinner in Profile the start up of the ISL6326 with any other voltage rail. Dynamic-VID technology allows seamless on-the-fly VID Pb-Free (RoHS Compliant) changes. The offset pin allows accurate voltage offset settings that are independent of VID setting. Ordering Information PART NUMBER PART TEMP. PACKAGE PKG. (Note) MARKING (C) (Pb-Free) DWG. ISL6326CRZ* ISL6326CRZ 0 to+70 40 Ld 6x6 QFN L40.6x6 ISL6326IRZ* ISL6326IRZ -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. FN9262 Rev 1.00 Page 1 of 30 May 5, 2008ISL6326 Pinout ISL6326 (40 LD QFN) TOP VIEW 40 39 38 37 36 35 34 33 32 31 VID6 ISEN3+ 1 30 VID5 ISEN3- 2 29 VID4 ISEN2- 3 28 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- DAC 10 21 ISEN1+ 11 12 13 14 15 16 17 18 19 20 FN9262 Rev 1.00 Page 2 of 30 May 5, 2008 REF VID7 COMP TM FB VR HOT IDROOP VR FAN VDIFF VR RDY RGND SS VSEN FS TCOMP EN VTT VCC EN PWR PWM1 PWM3