RRAMP DATASHEET ISL8115 FN8272 Rev 1.00 High Voltage Synchronous Buck PWM Controller with Integrated Gate Driver and September 23, 2013 Current Sharing Capability The ISL8115 is a synchronous buck PWM controller with Features current sharing capability. The current sharing function allows Wide V range operation: 2.97V to 36V up to 5.5V output multiple modules to be connected in parallel to achieve higher IN and 30A load current per phase output current and to reduce input and output ripple current, resulting in fewer components and reduced output dissipation. Fast transient response - Voltage-mode PWM leading-edge modulation with Utilizing voltage-mode control with input voltage feed-forward non-linear control compensation, the ISL8115 maintains a constant loop gain for -Input voltage feed-forward optimal transient response, especially for applications with a Integrated 5V high speed 4A MOSFET gate drivers wide input voltage range. - Internal bootstrap diode The ISL8115 protects against overcurrent conditions by Excellent output voltage regulation inhibiting the PWM operation while monitoring the current - 0.6V 1.0% internal reference (-40C ~ 125C) with DCR of the output inductor, or a precision resistor. It also - 0.6V 0.7% internal reference (-40C ~ 105C) has a pre-POR overvoltage protection option, which provides - Differential voltage sensing some protection to the load if the upper MOSFET(s) is shorted. Excellent current balancing and overcurrent protection The ISL8115 features remote ground sensing, programmable - Peak and average overcurrent protection input voltage UVLO, output under/overvoltage protection, - Output current monitor on the ISET pin power-good indication, and fault Hand Shake capability. Oscillator programmable from 150kHz to 1.5MHz - Frequency synchronization to external clock signal Applications Diode emulation mode for light load efficiency improvement Power supply for datacom/telecom and POL Power-good open drain output Wide input voltage range buck regulators Pre-bias start-up function High current density power supplies RF power amplifier bias compensation Output OVP, UVP OTP Adjustable Soft-Start ROS ROS1 2k 2k RFB3 3k 3k CFB3 RFB3 RFB1 8.2nF 49.9 C CFB2 33nF CFB1 0.22F 2.2nF RFB2 787 1.27k CPLL 2.2nF CPVCC R 25 QL 10k 4.7F 1nF GND 2.8k 2*6TPF330M9L 19 12 4 ISET LGATE RPLL 4*100F 4*1 RPCC 5.11k 2*RJK0301 20 11 390pF COUT ISHARE PVCC 2.2 21 10 1 2 PLL COMP U1 PHASE VOUT RCONF LOUT CVIN1 1.5V/30A 22 9 4 ISL8115FRTZ CONF UGATE 320nH, 0.53m, PA1513-321 4*10F 11.8k CBOOT 23 QH 8 CLKOUT BOOT 0.22F RSS 24 7 SS VIN 2*RJK0305 18.2k CVIN 2.2F RFSET RFF H 113k REN L 33.2k 2.2F 10k RVIN 140k 4.12k 2 REN U 68.1k 10V-15V VIN FIGURE 1. TYPICAL APPLICATION CIRCUIT, 10V-15V INPUT, 1.5V/30A OUTPUT FN8272 Rev 1.00 Page 1 of 24 September 23, 2013 CISET RISET CPLL H CVCC RFF L 1 18 FSET COMP 2 17 EN FB 3 16 VCC RGND 4 15 PGOOD VMON 5 RISEN 14 RAMP ISENB 6 13 VFF ISENA 1 1 5 5 2 2 3 3ISL8115 Table of Contents Application Diagrams 3 Block Diagram 5 Pin Configuration 6 Functional Pin Descriptions . 6 Ordering Information 7 Absolute Maximum Ratings . 8 Thermal Information . 8 Recommended Operating Conditions 8 Electrical Specifications . 8 Typical Performance Curves . 11 Functional Description 14 Functional Overview . 14 Initialization 14 Enable and Input Voltage UVLO 14 Pre-bias Startup . 14 Setting CONF Pin 14 Setting SS pin . 14 Frequency Setting . 15 Voltage Feed-forward 15 Non Linear Control . 15 Power-Good 15 Undervoltage and Overvoltage Protection . 16 POR Overvoltage Protection (POR-OVP) . 16 Over-Temperature Protection (OTP) 16 Inductor Current Sensing . 16 Peak Current Limit . 17 Average Overcurrent Protection 18 DEM . 18 Current Sharing . 18 Feedback Compensation . 19 Modulator Break Frequency Equations 20 Compensation Break Frequency Equations 20 Layout Considerations 21 General PowerPAD Design Considerations 22 Revision History 23 About Intersil 23 Package Outline Drawing 24 FN8272 Rev 1.00 Page 2 of 24 September 23, 2013