LM34917A Series
2.3x2mm, 8-33V, 1.25A, Constant On-Time Non-Synchronous Buck Regulator w/ Intelligent Current Limit
Manufacturer: Texas Instruments
Catalog
2.3x2mm, 8-33V, 1.25A, Constant On-Time Non-Synchronous Buck Regulator w/ Intelligent Current Limit
Key Features
• Functional Input Voltage Range: 8V to 33VDSBGA packageInput Over-Voltage Shutdown at ≊35VTransient Capability to 50VIntegrated N-Channel buck switchValley current limit varies with VINand VOUTto reduce excessive inductor currentOn-time is reduced when in current limitIntegrated start-up regulatorNo loop compensation requiredUltra-Fast transient responseMaximum switching frequency: 2 MHzOperating frequency remains nearly constant with load current and input voltage variationsProgrammable soft-startPrecision internal referenceAdjustable output voltageThermal shutdownPackage12-Bump DSBGA PackageAll trademarks are the property of their respective owners.Functional Input Voltage Range: 8V to 33VDSBGA packageInput Over-Voltage Shutdown at ≊35VTransient Capability to 50VIntegrated N-Channel buck switchValley current limit varies with VINand VOUTto reduce excessive inductor currentOn-time is reduced when in current limitIntegrated start-up regulatorNo loop compensation requiredUltra-Fast transient responseMaximum switching frequency: 2 MHzOperating frequency remains nearly constant with load current and input voltage variationsProgrammable soft-startPrecision internal referenceAdjustable output voltageThermal shutdownPackage12-Bump DSBGA PackageAll trademarks are the property of their respective owners.
Description
AI
The LM34917A Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying at least 1.25A to the load. To reduce excessive switch current due to the possibility of a saturating inductor the valley current limit threshold changes with input and output voltages, and the on-time is reduced when current limit is detected. This buck regulator contains an N-Channel Buck Switch, and is available in the 12 pin DSBGA package. The constant on-time feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCCunder-voltage lock-out, input over-voltage shutdown, thermal shutdown, gate drive under-voltage lock-out, and maximum duty cycle limit.
The LM34917A Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying at least 1.25A to the load. To reduce excessive switch current due to the possibility of a saturating inductor the valley current limit threshold changes with input and output voltages, and the on-time is reduced when current limit is detected. This buck regulator contains an N-Channel Buck Switch, and is available in the 12 pin DSBGA package. The constant on-time feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCCunder-voltage lock-out, input over-voltage shutdown, thermal shutdown, gate drive under-voltage lock-out, and maximum duty cycle limit.
