ISL8502A,2a同步降压稳压器集成MOSFET

　　The ISL8502A is a synchronous buck controller with internalMOSFETspackaged in a small 4mmx4mm QFN package. The ISL8502Acansupport a continuous loadof 2A and has a very wide input voltage range. With the switchingMOSFETs integrated into theIC， the complete regulator footprint can be very small and provide a much more efficient solution than alinearregulator. The ISL8502A is capable of stand-alone operation or it can be used in a master slave combination for multiple outputs that are derived from the same input rail. Multiple slave channels （up to six） can be synchronized. This method minimizes the EMI and beat frequencies effect with multi-channel operation. The switching PWM controller drives two internal N-Channel MOSFETs in a synchronous-rectified buck converter topology. The synchronous buck converter uses voltage-mode control with fast transient response. The switching regulator provides amaximum static regulation tolerance of ±1% over line， load， and temperature ranges. The output is user-adjustable by means of external resistors down to 0.6V. The output is monitored for undervoltage events. The switching regulator also has overcurrent protection. Thermal shutdown is integrated. The ISL8502A features a bi-directional Enablepin that allows the part to pull the enable pin low during fault detection. PGOOD delay for ISL8502A has been decreased to 1ms typical （at 500kHz switching frequency） compared to 250ms （at 500kHz） for ISL8502.