DATASHEET ISL8502 FN6389 Rev 2.00 2A Synchronous Buck Regulator with Integrated MOSFETs June 29, 2010 The ISL8502 is a synchronous buck controller with internal Features MOSFETs packaged in a small 4mmx4mm QFN package. Up to 2A Continuous Output Current The ISL8502 can support a continuous load of 2A and has a very wide input voltage range. With the switching MOSFETs Integrated MOSFETs for Small Regulator Footprint integrated into the IC, the complete regulator footprint can Adjustable Switching Frequency, 500kHz to 1.2MHz be very small and provide a much more efficient solution Tight Output Voltage Regulation, 1% Over-Temperature than a linear regulator. Wide Input Voltage Range, 5V 10% or 5.5V to 14V The ISL8502 is capable of stand alone operation or it can be used in a master slave combination for multiple outputs that Wide Output Voltage Range, from 0.6V are derived from the same input rail. Multiple slave channels Simple Single-Loop Voltage-Mode PWM Control Design (up to six) can be synchronized. This method minimizes the EMI and beat frequencies effect with multi-channel Input Voltage Feed-Forward for Constant Modulator Gain operation. Fast PWM Converter Transient Response The switching PWM controller drives two internal N-Channel Lossless r High Side and Low Side Overcurrent DS(ON) MOSFETs in a synchronous-rectified buck converter Protection topology. The synchronous buck converter uses Undervoltage Detection voltage-mode control with fast transient response. The switching regulator provides a maximum static regulation Integrated Thermal Shutdown Protection tolerance of 1% over line, load, and temperature ranges. Power-Good Indication The output is user-adjustable by means of external resistors down to 0.6V. Adjustable Soft-Start Start-Up with Pre-Bias Output The output is monitored for undervoltage events. The switching regulator also has overcurrent protection. Thermal Pb-free (RoHS Compliant) shutdown is integrated. The ISL8502 features a bi-directional Enable pin that allows the part to pull the enable pin low Applications during fault detection. Point of Load Applications Pinout Graphics Cards - GPU and Memory Supplies ISL8502 (24 LD QFN) ASIC Power Supplies TOP VIEW Embedded Processor and I/O supplies DSP Supplies 24 23 22 21 20 19 Ordering Information PGOOD 1 18 VIN PART TEMP. SGND 2 17 PHASE NUMBER PART RANGE PACKAGE PKG. EN 3 16 PHASE (Note) MARKING (C) (Pb-free) DWG. GND 25 ISL8502IRZ* 85 02IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4D SYNCH 4 15 PHASE *Add -T suffix for tape and reel. Please refer to TB347 for details on 5 14 M/S PHASE reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ FS 6 13 PGND special Pb-free material sets, molding compounds/die attach 78 9 10 11 12 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. FN6389 Rev 2.00 Page 1 of 19 June 29, 2010 COMP VCC FB PVCC SS BOOT PGND VIN PGND VIN PGND VINISL8502 FN6389 Rev 2.00 Page 2 of 19 June 29, 2010 Block Diagram VCC PVCC SS PGOOD VIN (x4) VIN OC PVCC MONITOR SERIES POR 30 A REGULATOR MONITOR BIAS SGND PVCC BOOT EN FAULT MONITORING GATE DRIVE AND ADAPTIVE PHASE (x4) SHOOT THRU VOLTAGE MONITOR PROTECTION SYNCH CLOCK AND M/S OSCILLATOR GENERATOR OC 0.6V MONITOR FS REFERENCE FB COMP PGND (x4)