1/ ? features z output voltage: 3.3v, 5.0v, 12v, and adjustable output version z adjustable version output voltage range:1.23v to 37v4% z 52khz15% fixed switching frequency z voltage mode non-synchronous pwm control z thermal-shutdown and current-limit protection z on/off shutdown control input z operating voltage can be up to 40v z output load current: 2a z low power standby mode z built-in switching transistor on chip z sop8-ep package ? general description the LSP3127 series are monolithic ic that design for a step-down dc/dc converter, and own the ability of driving a 2a load without additional transistor component. due to reducing the number of external component, the board space can be saved easily. the external shutdown function can be controlled by logic level and then come into standby mode. the internal compensation makes feedback control have good line and load regulation without external design. regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. the LSP3127 series operates at a switching frequency of 52 khz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. other features include a guaranteed 4% tolerance on output voltage under specified input voltage and output load conditions, and 15% on the oscillator frequency. the output version included fixed 3.3v, 5v, 12v, and an adjustable type. the package is available in a standard sop8-ep package. ? applications z simple high-efficiency step-down regulator z on-card switching regulators z positive to negative converter ? pin configuration sop8-ep (top view) ? pin description name no. description vin 1 operating voltage input output 2 switching output fb 3 output voltage feedback control sd 4 on/off shutdown gnd 5 ground gnd 6 ground gnd 7 ground gnd 8 ground joint bay semiconductor co.,ltd . + = $ 3 : 0 % x f n ' & |