DATASHEET ISL6545, ISL6545A FN6305 Rev 7.00 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller October 7, 2015 The ISL6545, ISL6545A makes simple work out of Features implementing a complete control and protection scheme for a Operates from +5V or +12V Supply Voltage (for bias) DC/DC stepdown converter driving N-Channel MOSFETs in a - 1.0V to 12V V Input Range (up to 20V possible with IN synchronous buck topology. Since it can work with either 5V or restrictions see Input Voltage Considerations) 12V supplies, this one IC can be used in a wide variety of - 0.6V to V Output Range IN applications within a system. The ISL6545, ISL6545A - Integrated Gate Drivers use V (5V to 12V) (hereafter referred to as ISL6545x, except as needed) CC - 0.6V Internal Reference 1.0% tolerance integrates the control, gate drivers, output adjustment, monitoring and protection functions into a single 8 Ld SOIC or Simple Single-Loop Control Design 10 Ld DFN package. - Voltage-Mode PWM Control The ISL6545x provides single feedback loop, voltage-mode - Drives N-Channel MOSFETs control with fast transient response. The output voltage can be - Traditional Dual Edge Modulator precisely regulated to as low as 0.6V, with a maximum Fast Transient Response tolerance of 1.0% over-temperature and line voltage - High-Bandwidth Error Amplifier variations. A selectable fixed frequency oscillator (ISL6545 for - Full 0% to 100% Duty Cycle 300kHz ISL6545A for 600kHz) reduces design complexity, while balancing typical application cost and efficiency. Lossless, Programmable Overcurrent Protection - Uses Lower MOSFETs r DS(ON) The error amplifier features a 20MHz gain-bandwidth product and 9V/s slew rate which enables high converter Small Converter Size in 8 Ld SOIC or 10 Ld DFN bandwidth for fast transient performance. The resulting - 300kHz or 600kHz Fixed Frequency Oscillator PWM duty cycles range from 0% to 100%. - Fixed Internal Soft-Start, Capable into a Pre-biased Load Protection from overcurrent conditions is provided by - Integrated Boot Diode monitoring the r of the lower MOSFET to inhibit PWM DS(ON) - Enable/Shutdown Function on COMP/SD Pin operation appropriately. This approach simplifies the - Output Current Sourcing and Sinking implementation and improves efficiency by eliminating the need for a current sense resistor. Pb-Free (RoHS Compliant) Pinout Applications ISL6545, ISL6545A Power Supplies for Microprocessors or Peripherals (8 LD SOIC) TOP VIEW - PCs, Embedded Controllers, Memory Supplies - DSP and Core Communications Processor Supplies BOOT 1 8 PHASE UGATE 2 7 COMP/SD Subsystem Power Supplies GND 3 6 FB - PCI, AGP Graphics Cards Digital TV LGATE/OCSET 4 5 VCC - SSTL-2 and DDR/DDR2/DDR3 SDRAM Bus Termination Supply Cable Modems, Set Top Boxes, and DSL Modems ISL6545, ISL6545A (10 LD 3x3 DFN) Industrial Power Supplies General Purpose Supplies TOP VIEW 5V or 12V-Input DC/DC Regulators 1 10 BOOT PHASE Low-Voltage Distributed Power Supplies UGATE 2 9 COMP/SD 3 GND 8 N/C FB GND 4 7 N/C LGATE/OCSET 5 6 VCC FN6305 Rev 7.00 Page 1 of 17 October 7, 2015ISL6545, ISL6545A ISL6545, ISL6545A * Ordering Information FIXED FREQUENCY PART NUMBER OSCILLATOR TEMP. RANGE PACKAGE PKG. (Notes 1, 2, 3) PART MARKING (kHz) (C) (Pb-Free) DWG. ISL6545CBZ 6545 CBZ 300 0 to +70 8 Ld SOIC M8.15 ISL6545ACBZ 6545 ACBZ 600 0 to +70 8 Ld SOIC M8.15 ISL6545IBZ 6545 IBZ 300 -40 to +85 8 Ld SOIC M8.15 ISL6545AIBZ 6545 AIBZ 600 -40 to +85 8 Ld SOIC M8.15 ISL6545CRZ 545Z 300 0 to +70 10 Ld DFN L10.3x3C ISL6545ACRZ 45AZ 600 0 to +70 10 Ld DFN L10.3x3C ISL6545AIRZ 5ARZ 600 -40 to +85 10 Ld DFN L10.3x3C NOTES: 1. Add -T* suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. 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. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL6545, ISL6545A. For more information on MSL please see techbrief TB363. FN6305 Rev 7.00 Page 2 of 17 October 7, 2015