ISL6545, ISL6545A Data Sheet March 3, 2011 FN6305.6 5V or 12V Single Synchronous Buck Features Pulse-Width Modulation (PWM) Controller Operates from +5V or +12V Supply Voltage (for bias) The ISL6545, ISL6545A makes simple work out of Input Range (up to 20V possible with - 1.0V to 12V V IN implementing a complete control and protection scheme for a restrictions see Input Voltage Considerations) DC/DC stepdown converter driving N-Channel MOSFETs in a Output Range - 0.6V to V IN synchronous buck topology. Since it can work with either 5V or - Integrated Gate Drivers use V (5V to 12V) CC 12V supplies, this one IC can be used in a wide variety of - 0.6V Internal Reference 1.0% tolerance applications within a system. The ISL6545, ISL6545A Simple Single-Loop Control Design (hereafter referred to as ISL6545x, except as needed) - Voltage-Mode PWM Control integrates the control, gate drivers, output adjustment, - Drives N-Channel MOSFETs monitoring and protection functions into a single 8 Ld SOIC or 10 Ld DFN package. - Traditional Dual Edge Modulator Fast Transient Response The ISL6545x provides single feedback loop, voltage-mode control with fast transient response. The output voltage can be - High-Bandwidth Error Amplifier precisely regulated to as low as 0.6V, with a maximum - Full 0% to 100% Duty Cycle tolerance of 1.0% over-temperature and line voltage Lossless, Programmable Overcurrent Protection variations. A selectable fixed frequency oscillator (ISL6545 for - Uses Lower MOSFETs r DS(ON) 300kHz ISL6545A for 600kHz) reduces design complexity, while balancing typical application cost and efficiency. Small Converter Size in 8 Ld SOIC or 10 Ld DFN - 300kHz or 600kHz Fixed Frequency Oscillator The error amplifier features a 20MHz gain-bandwidth - Fixed Internal Soft-Start, Capable into a Pre-biased product and 9V/s slew rate which enables high converter Load bandwidth for fast transient performance. The resulting - Integrated Boot Diode PWM duty cycles range from 0% to 100%. - Enable/Shutdown Function on COMP/SD Pin Protection from overcurrent conditions is provided by - Output Current Sourcing and Sinking monitoring the r of the lower MOSFET to inhibit PWM DS(ON) Pb-Free (RoHS Compliant) operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the Applications need for a current sense resistor. Power Supplies for Microprocessors or Peripherals Pinout - PCs, Embedded Controllers, Memory Supplies ISL6545, ISL6545A - DSP and Core Communications Processor Supplies (8 LD SOIC) Subsystem Power Supplies TOP VIEW - PCI, AGP Graphics Cards Digital TV BOOT 1 8 PHASE - SSTL-2 and DDR/DDR2/DDR3 SDRAM Bus UGATE 2 7 COMP/SD Termination Supply 6 FB GND 3 Cable Modems, Set Top Boxes, and DSL Modems 5 LGATE/OCSET 4 VCC Industrial Power Supplies General Purpose Supplies 5V or 12V-Input DC/DC Regulators ISL6545, ISL6545A (10 LD 3x3 DFN) Low-Voltage Distributed Power Supplies TOP VIEW 1 10 BOOT PHASE UGATE 2 9 COMP/SD GND 3 8 FB N/C GND 4 7 N/C 5 6 LGATE/OCSET VCC CAUTION: These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1 1-888-INTERSIL or 1-888-468-3774 Copyright Intersil Americas Inc. 2006, 2007, 2009, 2011. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners.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 ISL6545IRZ 45IZ 300 -40 to +85 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. FN6305.6 2 March 3, 2011