资 源 简 介
The LM34914 Step-Down Switching Regulator features allthe funcTIons needed to implement a low cost, efficient, buckbias regulator capable of supplying at least 1.25A to the load.To reduce excessive switch current due to the possibility of asaturaTIng inductor the valley current limit threshold changeswith input and output voltages, and the on-TIme is reducedwhen current limit is detected. This buck regulator contains a44V N-Channel Buck Switch, and is available in the thermallyenhanced 3 mm x 3 mm LLP-10 package. The feedback regulaTIonscheme requires no loop compensation, results in fastload transient response, and simplifies circuit implementation.The operating frequency remains constant with line and loadvariations due to the inverse relationship between the inputvoltage and the on-time. The valley current limit results in asmooth transition from constant voltage to constant currentmode when current limit is detected, reducing the frequencyand output voltage, without the use of foldback. Additionalfeatures include: VCC under-voltage lock-out, thermal shutdown,gate drive under-voltage lock-out, and maximum dutycycle limit.
