DATASHEET
ISL8502A FN7940
Rev 0.00
October 21, 2011 2A Synchronous Buck Regulator with Integrated MOSFETs
The ISL8502A is a synchronous buck controller with internal
MOSFETs packaged in a small 4mmx4mm QFN package. The
ISL8502A can support a continuous load of 2A and has a very
wide input voltage range. With the switching MOSFETs
integrated into the IC, the complete regulator footprint can be
very small and provide a much more efficient solution than a
linear regulator.
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. Features Up to 2A Continuous Output Current Integrated MOSFETs for Small Regulator Footprint Adjustable Switching Frequency, 500kHz to 1.2MHz Tight Output Voltage Regulation, п‚±1% Over-temperature Wide Input Voltage Range, 5V п‚±10% or 5.5V to 14V Wide Output Voltage Range, from 0.6V Simple Single-Loop Voltage-Mode PWM Control Design Input Voltage Feed-Forward for Constant Modulator Gain 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
a maximum static regulation tolerance of п‚±1% over line, load,
and temperature ranges. The output is user-adjustable by
means of external resistors down to 0.6V. Fast PWM Converter Transient Response The output is monitored for undervoltage events. The switching
regulator also has overcurrent protection. Thermal shutdown is …
