DATASHEET ISL8500 FN6611 Rev 0.00 2A Standard Buck PWM Regulator December 10, 2007 The ISL8500 is a high-performance, simple output controller Features that provides a single, high frequency power solution for a Standard Buck Controller with Integrated Switching Power variety of point-of-load applications. The ISL8500 integrates MOSFET a 2A standard buck PWM controller and switching MOSFET. Integrated Boot Diode The PWM controller in the ISL8500 drives an internal Input Voltage Range switching N-Channel power MOSFET and requires an - Fixed 5V 10% external Schottky diode to generate an output voltage from - Variable 5.5V to 25V 0.6V to 19V. The integrated power switch is optimized for excellent thermal performance up to 2A of output current. PWM Output Voltage Adjustable from 0.6V to 19V with The standard buck input voltage range supports a fixed 5V Continuous Output Current up to 2A or variable 5.5V to 25V range. The PWM regulator switches 1% VFB Tolerance at a fixed frequency of 500kHz and utilizes simple voltage mode control with input voltage feed forward to provide Voltage Mode Control with Voltage Feed Forward flexibility in component selection and minimize solution size. Fixed 500kHz Switching Frequency Protection features include overcurrent, undervoltage and Externally Adjustable Soft-Start Time thermal overload protection integrated into the IC. The ISL8500 power good signal output indicates loss of Output Undervoltage Protection regulation on the PWM output. Enable Inputs ISL8500 is available in a small 4mmx3mm Dual Flat No-Lead PGOOD Output (DFN) package. Overcurrent Protection Ordering Information Thermal Overload Protection PART Internal 5V LDO regulator NUMBER PART TEMP. PACKAGE PKG. (Note) MARKING RANGE (C) (Pb-free) DWG. Applications ISL8500IRZ 500Z -40 to +85 12 Ld DFN L12.4x3 General Purpose ISL8500IRZ-T* 500Z -40 to +85 12 Ld DFN L12.4x3 WLAN Cards-PCMCIA, Cardbus32, MiniPCI Cards-Compact *Please refer to TB347 for details on reel specifications. Flash Cards NOTE: These Intersil Pb-free plastic packaged products employ Hand-Held Instruments special Pb-free material sets molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination LCD Panel finish, which is RoHS compliant and compatible with both SnPb and Set-top Box 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. Pinout ISL8500 (12 LD DFN) TOP VIEW VIN FB 12 1 COMP 11 VIN 2 PHASE SS 3 10 DFN 4x3 PHASE EN 4 9 PG BOOT 5 8 GND 6 7 VDD GND FN6611 Rev 0.00 Page 1 of 15 December 10, 2007ISL8500 Typical Application Schematic R3 C3 301 100pF VOUT R1 C2 R4 10k 2.2nF 3.16k C1 10pF R2 C5 51.1k 0.1F VIN 5.5V TO 25V C9 10uF EN L 10 H PHASE VOUT = 2.5V ISL8500 PG C10 C11 0.1 F BOOT 100 F D B340LB GND VDD C13 1 F FIGURE 1. VIN RANGE FROM 5.5V TO 25V FN6611 Rev 0.00 Page 2 of 15 December 10, 2007 SS FB COMP