DATASHEET ISL8105, ISL8105A FN6306 Rev 5.00 +5V or +12V Single-Phase Synchronous Buck Converter PWM Controller with April 15, 2010 Integrated MOSFET Gate Drivers The ISL8105, ISL8105A is a simple single-phase PWM Features controller for a synchronous buck converter. It operates from Operates from +5V or +12V Bias Supply Voltage +5V or +12V bias supply voltage. With integrated linear - 1.0V to 12V Input Voltage Range (up to 20V possible regulator, boot diode, and N-Channel MOSFET gate drivers, with restrictions see Input Voltage Considerations on the ISL8105, ISL8105A reduces external component count and page 9) board space requirements. These make the IC suitable for a - 0.6V to V Output Voltage Range IN wide range of applications. 0.6V Internal Reference Voltage Utilizing voltage-mode control, the output voltage can be - 1.0% Tolerance Over the Commercial Temperature precisely regulated to as low as 0.6V. The 0.6V internal Range (0C to +70C) reference features a maximum tolerance of 1.0% over the - 1.5% Tolerance Over the Industrial Temperature commercial temperature range, and 1.5% over the Range (-40C to +85C). industrial temperature range. Two fixed oscillator frequency Integrated MOSFET Gate Drivers that Operate from versions are available 300kHz (ISL8105 for high efficiency V (+5V to +12V) BIAS applications) and 600kHz (ISL8105A for fast transient - Bootstrapped High-side Gate Driver with Integrated applications). Boot Diode The ISL8105, ISL8105A features the capability of safe - Drives N-Channel MOSFETs start-up with pre-biased load. It also provides overcurrent Simple Voltage-Mode PWM Control protection by monitoring the ON-resistance of the - Traditional Dual Edge Modulation bottom-side MOSFET to inhibit PWM operation appropriately. During start-up interval, the resistor connected Fast Transient Response to BGATE/BSOC pin is employed to program overcurrent - High-Bandwidth Error Amplifier protection condition. This approach simplifies the - Full 0% to 100% Duty Cycle implementation and does not deteriorate converter Fixed Operating Frequency efficiency. - 300kHz for ISL8105 Pinouts - 600kHz for ISL8105A ISL8105, ISL8105A (10 LD 3X3 DFN) Fixed Internal Soft-Start with Pre-biased Load Capability TOP VIEW Lossless, Programmable Overcurrent Protection - Uses Bottom-side MOSFETs r DS(ON) BOOT LX 1 10 Enable/Disable Function Using COMP/EN Pin 2 9 TGATE COMP/EN GND Output Current Sourcing and Sinking Currents N/C 3 8 FB 4 7 GND N/C Pb-Free (RoHS Compliant) 5 6 BGATE/BSOC VBIAS Applications ISL8105, ISL8105A 5V or 12V DC/DC Regulators (8 LD SOIC) Industrial Power Systems TOP VIEW Telecom and Datacom Applications LX BOOT 8 1 Test and Measurement Instruments 7 COMP/EN TGATE 2 Distributed DC/DC Power Architecture 6 FB Point of Load Modules 3 GND 5 VBIAS 4 BGATE/BSOC FN6306 Rev 5.00 Page 1 of 16 April 15, 2010ISL8105, ISL8105A Ordering Information SWITCHING TEMPERATURE PART NUMBER PART FREQUENCY RANGE PACKAGE PKG. (Note) MARKING (kHz) (C) (Pb-Free) DWG. ISL8105CRZ* 5CRZ 300 0 to +70 10 Ld DFN L10.3x3C ISL8105IBZ* 8105 IBZ 300 -40 to +85 8 Ld SOIC M8.15 ISL8105IRZ* 5IRZ 300 -40 to +85 10 Ld DFN L10.3x3C ISL8105ACRZ* 05AZ 600 0 to +70 10 Ld DFN L10.3x3C ISL8105AIBZ* 8105 AIBZ 600 -40 to +85 8 Ld SOIC M8.15 ISL8105AIRZ* 5AIZ 600 -40 to +85 10 Ld DFN L10.3x3C ISL8105AEVAL1Z Evaluation Board *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. Typical Application Diagram V IN +1V TO +12V V C C BIAS HF BULK +5V OR +12V C DCPL VBIAS BOOT COMP/EN C BOOT Q1 TGATE C 1 L OUT C V 2 OUT ISL8105 LX R 2 C OUT FB Q2 BGATE/BSOC GND R BSOC C R 3 3 R 1 R 0 FN6306 Rev 5.00 Page 2 of 16 April 15, 2010