Single-Phase PWM Controller

® ISL8106 Data Sheet November 10, 2006 FN9283.1 Wide VIN, 7V to 25V, Single-Phase PWM Controller with Integrated MOSFET Drivers The ISL8106 is a Single-Phase Synchronous-Buck PWM Controller with a input voltage range of +7.0V to +25.0V featuring Intersil's Robust Ripple Regulator (R3) technology that delivers exceptional dynamic response to input voltage and output load transients. Integrated MOSFET drivers, 5V LDO, and bootstrap diode result in fewer components and smaller implementation area for power supply systems. The ISL8106 features a 1.5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL8106 can be configured to operate in forced-continuousconduction-mode (FCCM) or in diode-emulation-mode (DEM), which improves light-load efficiency. In FCCM the controller always operates as a synchronous rectifier, switching the bottom-side MOSFET regardless of the output load. With DEM enabled, the bottom-side MOSFET is disabled preventing negative current flow from the output inductor during low load operation. This makes the ISL8106 an excellent choice for all “green” applications. An audio filter prevents the PWM switching frequency from entering the audible spectrum due to extremely light load while in DEM. A PGOOD pin featuring a unique fault-identification capability significantly reduces system trouble-shooting time and effort. The pull-down resistance of the PGOOD pin is 30Ω for an overcurrent fault, 60Ω for an overvoltage fault, or 90Ω for either an undervoltage fault or during soft-start. Overcurrent protection is accomplished by measuring the voltage drop across the rDS(ON) of the bottom-side MOSFET. A single resistor programs the overcurrent and short-circuit points. Overvoltage and undervoltage protection is monitored at the FB voltage feedback pin. Features • Wide input voltage range: +7.0V to +25.0V • High performance R3 technology delivers extremely fast transient response • +0.6V Internal Reference - ±0.6% tolerance over the commercial temperature Range (0°C to +70°C) - ±1.0% tolerance over the industrial temperature range (-40°C to +85°C) • Output voltage range: +0.6V to VCC-0.3V • Selectable forced continuous conduction mode or diode emulation mode • Integrated MOSFET drivers with shoot-through protection • External type-two loop compensation • Internal 5V low-dropout regulator with Integrated bootstrap diode • Programmable PWM frequency: 200kHz to 600kHz • PWM minimum frequency above audible spectrum • Internal digital soft-start with prebiased startup capability • Power good monitor with fault identification by PGOOD pull down resistance • Lossless, programmable overcurrent protection - Uses bottom-side MOSFET’s rDS(ON) • Undervoltage protection, soft crowbar overvoltage protection and over-temperature protection • Pb-free plus anneal available (RoHS compliant) Applications • Telecom/datacom applications • Industrial applications • Distributed DC/DC power architecture • Point-of-load modules Pinout 16 LD QFN (4mm x 4mm) TOP VIEW PGOOD TGATE 14 BOOT 13 12 PVCC 11 BGATE GND FCCM EN 3 4 5 COMP 6 FB 7 FSET 8 VO 10 PGND 9 BSOC 16 VIN VCC 1 2 15 LX 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL8106 Ordering Information PART NUMBER ISL8106CRZ* ISL8106IRZ* ISL8106EVAL1Z PART MARKING 8106CRZ 8106IRZ Evaluation Board TEMP (°C) 0 to +70 -40 to +85 PACKAGE 16 Ld 4x4 QFN 16 Ld 4x4 QFN PKG. DWG. # L16.4x4 L16.4x4 *Add “-T” suffix for tape and reel. NOTE: Intersil Pb-free plus anneal 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. Typical Application VIN +7V TO +25V PGOOD RPGOOD PGOOD VIN BOOT CBOOT QTS LOUT CIN PVCC RVCC VCC CPVCC CVCC GND TGATE LX BSOC RBSOC VOUT COUT ISL8106 BGATE QBS FCCM EN RCOMP COMP PGND FSET CCOMP1 FB CCOMP2 VO RFSET CFSET RBOT RTOP 2 FN9283.1 November 10, 2006 Block Diagram VIN VO GND PACKAGE BOTTOM LDO PWM FREQUENCY CONTROL FSET VCC VREF EN gmVIN VW + − + R PWM Q S − OVP UVP + EA FB COMP BSOC DRIVER POR DIGITAL SOFT-START PWM CONTROL LX SHOOT THROUGH PROTECTION PVCC TGATE − OCP PGOOD FCCM + IOC 30Ω 90Ω − − + gmVO + − CR VCOMP + BOOT 60Ω DRIVER 150°OT PGND FN9283.1 November 10, 2006 − + VR − ISL8106 BGATE + − + − 3 ISL8106 Absolute Voltage Ratings BSOC, VIN to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +28V VCC, PGOOD to GND . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V PVCC to PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V GND to PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V EN, FCCM. . . . . . . . . . . . . . . . . . . . . . . . -0.3V to GND, VCC +3.3V LX to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (DC) -0.3V to +28V . . . . . . . . . . . . . . . . . . . . . . . . . . (<100ns Pulse Width, 10μJ) -5.0V BOOT to GND, or PGND . . . . . . . . . . . . . . . . . . . . . . -0.3V to +33V BOOT to LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7V TGATE . . . . . . . . . . . . . . . . . . . . . . .(DC) -0.3V to LX, BOOT +0.3V . . . . . . . . . . . . . . . . . . . . . . . . . . (<200ns Pulse Width, 20μJ) -4.0V BGATE . . . . . . . . . . . . . . . . . . . . (DC) -0.3V to PGND, PVCC +0.3V . . . . . . . . . . . . . . . . . . . . . . . . . . . (<100ns Pulse Width, 4μJ) -2.0V ESD Classification . . . . . . . . . . . . . . . . . . . . . .Level 1 (HBM = 2kV) Thermal Information Thermal Resistance (Typical, Notes 1, 2) θJA (°C/W) θJC (°C/W) QFN Package . . . . . . . . . . . . . . . . . . . 48 11.5 Junction Temperature Range . . . . . . . . . . . . . . . . . -55°C to +150°C Operating Temperature Range ISL8106CRZ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C ISL8106IRZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C Lead Temperature . . . . . . . . . . . . . . . . . . . . (soldering, 10s)+300°C Recommended Operating Conditions Ambient Temperature Range (ISL8106C) . . . . . . . . . . 0°C to +70°C Ambient Temperature Range (ISL8106I) . . . . . . . . . -40°C to +85°C Supply Voltage (VIN to GND) . . . . . . . . . . . . . . . . . . . . . . 7V to 25V CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. NOTES: 1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 2. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside. 3. Parameters are Guaranteed by Design. Electrical Specifications PARAMETER VIN VIN Voltage Range VIN Input Bias Current VIN Shutdown Current VCC LDO VCC Output Voltage Range VCC POR THRESHOLD Recommended Operating Conditions, unless otherwise noted specifications in bold are valid for process, temperature, and line operating conditions. SYMBOL TEST CONDITIONS MIN TYP MAX UNIT VIN IVIN ISHDN EN and FCCM = 5V, FB = 0.65V, VIN = 7V to 25V EN = GND, VIN = 25V 7.0 2.2 0.1 25.0 3.0 1.0 V mA μA VCC VIN = 7V to 25V, ILDO = 0mA to 80mA 4.75 5.00 5.25 V Rising VCC POR Threshold Voltage VCCTHR V ISL8106CRZ ISL8106IRZ 4.35 4.33 4.10 4.08 4.45 4.45 4.20 4.20 4.55 4.55 4.30 4.30 V V V V Falling VCC POR Threshold Voltage CONTROL INPUTS EN High Threshold Voltage EN Low Threshold Voltage FCCM High Threshold Voltage FCCM Low Threshold Voltage EN Leakage Current CCTHF ISL8106CRZ ISL8106IRZ VENTHR VENTHF VFCCMTHR VFCCMTHF IENL IENH EN = 0V EN = 5.0V FCCM = 0V FCCM = 5.0V 2.0 0.5 2.0 1.0 <0.1 20 <0.1 2.0 1.0 1.0 V V V V μA μA μA μA FCCM Leakage Current REFERENCE Reference Voltage Voltage Regulation Accuracy IFCCML IFCCMH VREF VREG ISL8106CRZ ISL8106IRZ -0.6 -1.0 0.6 +0.6 +1.0 V % % 4 FN9283.1 November 10, 2006 ISL8106 Electrical Specifications PARAMETER PWM FOSC Frequency Range FAUDIO FCCM = 5V FCCM = GND; ISL8106CRZ FCCM = GND; ISL8106IRZ Frequency-Set Accuracy VO Range VO Input Leakage Current ERROR AMPLIFIER FB Input Bias Current COMP Source Current COMP Sink Current COMP High Clamp Voltage COMP Low Clamp Voltage GATE DRIVER TGATE Pull-Up Resistance TGATE Source Current TGATE Sink Resistance TGATE Sink Current BGATE Pull-Up Resistance BGATE Source Current BGATE Sink Resistance BGATE Sink Current Delay From TGATE Falling to BGATE Rising Delay From BGATE Falling to TGATE Rising BOOTSTRAP DIODE Forward Voltage Reverse Leakage POWER GOOD PGRSS PGRUV PGRSS PGOOD Pull Down Impedance PGRUV PGROV PGOOD = 5mA Sink; ISL8106CRZ PGOOD = 5mA Sink; ISL8106IRZ PGROC PGOOD = 5mA Sink; ISL8016CRZ PGOOD = 5mA Sink; ISL8106IRZ PGOOD Leakage Current PGOOD Maximum Sink Current IPGOOD PGOOD = 5V 50 45 25 22 63 63 32 32 <0.1 5.0 78 81 40 43 1.0 Ω Ω Ω Ω μA mA PGOOD = 5mA Sink; ISL8106IRZ 67 95 118 Ω PGOOD = 5mA Sink; ISL8106CRZ 75 95 115 Ω VF IR PVCC = 5V, IF = 2mA VR = 25V 0.58 0.2 V μA RTGATEPU 200mA Source Current (Note 3) 1.0 2.0 1.0