- Function input voltage range: 8V to 33V
- Miniature SMD package
-
When the input is overvoltage off ≊ 451
- Transient performance up to 50V
- Integrated N-channel buck switch
- The valley current limit varies with VINand VOUTReduce excessive inductor current
- On the time decreases, the current is limited
- Integrated launcher
- No loop compensation requirements are required
- Ultra-fast transient response
- Maximum switching frequency: 2 MHz
- The operating frequency is almost constant with changes in load current and input voltage
- Programmable soft-start
- Precision internal reference
- Adjustable output voltage
- Thermal shutdown
illustrate
The LM34917A buck switching regulator requires all the features to achieve low-cost functionality, high efficiency, and a load capacity of at least 1.25A supplied by the buck bias regulator. To reduce the possibility of excessive switching current due to saturation inductance, valley current limit is limited with changes in input and output voltage thresholds, as well as time reduction when current limit is detected. This buck regulator contains an N-channel buck switch and is available in a 12-pin miniature SMD package. The constant on-time feedback regulation loop compensation scheme eliminates the need for fast load transient response, results, and simplifies circuit design. The operating frequency remains dependent on the line and load due to the inverse relationship between input voltage and on-time. Smooth transition in the valley, from current limit current limit detection results in constant current constant voltage mode, reducing frequency and output voltage without foldback. Other features include: VCCUndervoltage lockout, input overvoltage shutdown, overtemperature shutdown, gate drive undervoltage lockout, and maximum duty cycle limit.
|