描述 Description

A Current?Mode PWM Buck regulator that?switches to PFM mode under light?loads. The entire regulator function is?implemented with only a few, low cost?external components.?The LX13049 responds quickly to?dynamic load changes using a high?bandwidth error amplifier and internal?compensation. Tight output voltage?regulation is maintained with the?temperature compensated 800mV,?bandgap reference achieving +/-3.5%?regulation tolerance for all line, load?and thermal conditions. The output?voltage is easily programmed, from?800mV to 90% of VIN with two?external resistors.?The regulator is capable of providing an?output load current up to 1.25A and has?no minimum load current requirement?for stable operation. Current limit?senses on a cycle-by cycle basis to?protect the switch. Power conversion?efficiency is maximized with PFM?mode of operation and low regulator?quiescent current.?The LX13049 operational supply?voltage range covers 4.0V to 6.0V,?features include: power on delay; soft?start to limit inrush currents and thermal?shutdown during fault conditions.?The 6-pin JEDEC MO-229 package?provides a small form factor and low?profile at 3x3x1mm with excellent?power dissipation capability on surface?mount PCB’s.??ROHS, PB Free-->??ROHS