SG1524/SG2524/SG3524 is a switching power supply controller from LINFINITY Microelectronics Inc., with 8V to 40V operation range, 5V reference, 0.4% reference line and load regulation, < ± 1% reference temperature coefficient, 100Hz to 300KHz oscillator range, excellent external sync capability, dual 50mA output transistors, current limit circuitry, complete PWM power control circuitry, single ended or push-pull outputs, total supply current less than 10mA.