ISL6540ACRZ-T

DATASHEET ISL6540A FN6288 Rev 5.00 Oct 7, 2008 Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability The ISL6540A is an improved version of the ISL6540 single-phase voltage-mode PWM controller with input voltage feed-forward compensation to maintain a constant loop gain for optimal transient response, especially for applications with a wide input voltage range. Its integrated high speed synchronous rectified MOSFET drivers and other sophisticated features provide complete control and protection for a DC/DC converter with minimum external components, resulting in minimum cost and less engineering design efforts. Features The output voltage of the converter can be precisely regulated with an internal reference voltage of 0.591V, and has an improved system tolerance of ±0.68% over commercial temperature and line load variations. An external voltage can be used in place of the internal reference for voltage tracking/DDR applications. • Internal Linear Regulator (LR) - 5.5V Bias from VIN The ISL6540A has an internal linear regulator or external linear regulator drive options for applications with only a single supply rail. The internal oscillator is adjustable from 250kHz to 2MHz. The integrated voltage margining, programmable pre-biased soft-start, differential remote sensing amplifier, and programmable input voltage POR features enhance the ISL6540A value. Pinout VMON GND FB COMP FS LSOC HSOC ISL6540A (28 LD 5x5 QFN) TOP VIEW 28 27 26 25 24 23 22 • VIN and Power Rail Operation from +3.3V to +20V • Fast Transient Response - 0 to 100% Duty Cycle - 15MHz Bandwidth Error Amplifier with 6V/µs Slew Rate - Voltage-Mode PWM Leading and Trailing-Edge Modulation Control - Input Voltage Feedforward Compensation • 2.9V to 5.5V High Speed 2A/4A MOSFET Gate Drivers - Tri-state for Power Stage Shutdown • External LR Drive for Optimal Thermal Performance • Voltage Margining with Independently Adjustable Upper and Lower Settings for System Stress Testing and Over Clocking • Reference Voltage I/O for DDR/Tracking Applications • Improved 0.591V Internal Reference with Buffered Output - ±0.68%/±1.0% Over Commercial/Industrial Range • Source and Sink Overcurrent Protections - Low-and High-Side MOSFET rDS(ON) Sensing • Overvoltage and Undervoltage Protections • Small Converter Size - QFN package • Oscillator Programmable from 250kHz to 2MHz • Differential Remote Voltage Sensing with Unity Gain • Programmable Soft-Start with Pre-Biased Load Capability • Power-Good Indication with Programmable Delay • EN Input with Voltage Monitoring Capability • Pb-Free (RoHS Compliant) Applications VSEN+ 1 21 BOOT VSEN- 2 20 UGATE REFOUT 3 19 PHASE 18 PGND 17 LGATE GND • • • • Power Supply for some Microprocessors and GPUs Wide and Narrow Input Voltage Range Buck Regulators Point of Load Applications Low-Voltage and High Current Distributed Power Supplies Ordering Information PART NUMBER* (Note) REFIN 4 SS 5 OFS+ 6 16 PVCC ISL6540ACRZ* ISL6540 ACRZ OFS- 7 15 LINDRV ISL6540AIRZ* BOTTOM SIDE PAD FN6288 Rev 5.00 Oct 7, 2008 14 VIN 13 VFF 12 EN 11 PG 10 PG_DLY 9 MARCTRL VCC 8 PART MARKING TEMP. RANGE (°C) PACKAGE (Pb-Free) PKG. DWG. # 0 to +70 28 Ld 5x5 QFN L28.5x5 ISL6540 AIRZ -40 to +85 28 Ld 5x5 QFN L28.5x5 ISL6540AIRZA* ISL6540 AIRZ -40 to +85 28 Ld 5x5 QFN L28.5x5 *Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications. These Intersil Pb-free plastic packaged products employ special Pbfree 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. Page 1 of 22 VCC EN ISL6540A FN6288 Rev 5.00 Oct 7, 2008 Block Diagram LIN_DRV VIN POWER-ON REFERENCE VREF = 0.591 V REFIN RESET (POR) INTERNAL SERIES LINEAR EXTERNAL SERIES LINEAR DRIVER HSOC REFOUT 100µA MAR_CTRL OFS+ OFS- BOOT SOFT-START AND FAULT LOGIC VOLTAGE MARGINING SOURCE OCP UGATE OTA PWM COMP SS FB EA GATE CONTROL LOGIC PHASE COMP PVCC VCC OV/UV COMP 1.8V OSCILLATOR LGATE SOURCE OCP PGND PGOOD COMP VSEN+ G = -1 VSEN- GND GND G=1 UNITY GAIN DIFF AMP 100A SINKING OCP Page 2 of 22 VMON PG_DLY PG LSOC VFF FS ISL6540A Typical Application I (Internal Linear Regulator with Remote Sense) VIN LIN * RCC RVIN VCC VIN CBIN * Note: RCC*CF1