资 源 简 介
The LM34919 Step Down Switching Regulator features all ofthe funcTIons needed to implement a low cost, efficient, buckbias regulator capable of supplying 0.6A to the load. This buckregulator contains an N-Channel Buck Switch, and is availablein a micro SMD package. The constant on-TIme feedbackregulaTIon scheme requires no loop compensaTIon, results infast load transient response, and simplifies circuit implementation.The operating frequency remains constant with lineand load variations due to the inverse relationship betweenthe input voltage and the on-time. The valley current limit resultsin a smooth transition from constant voltage to constantcurrent mode when current limit is detected, reducing the frequencyand output voltage, without the use of foldback. Additionalfeatures include: VCC under-voltage lockout, thermalshutdown, gate drive under-voltage lockout, and maximumduty cycle limiter.
