LM3671MFX-1.25

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LM3671MFX-1.25 Application Field and Working Principle

The LM3671MFX-1.25 is a triple output, step up/down, synchronous, DC/DC switching regulator. It is operating over an input voltage range of 2.5V to 16V and output voltage from 2.5V to 14V. It is usually used in industrial and automotive applications, like fail-safe power supplies, microprocessor supplies, and battery-charging applications.

The LM3671MFX-1.25 features the synchronous topology to achieve the highest conversion efficiency, superior transient response and precision output regulation. The user can also make use of its wide output voltage range for providing variable output voltage regulation. Moreover, it is available in a compact Lead-Free/Halogen-Free package and has a high power capability.

Application Areas

The LM3671MFX-1.25 is suitable for many applications such as:

• Automotive Control Units
• Fail-Safe Power Supplies
• Li-ion Power Management
• Microprocessor Supplies
• Battery-Charging Applications
• Data Converters/Peripherals
• Medical Imaging/Instruments
• Smartphones/Tablets/Notebook PCs.

Working Principle

The LM3671MFX-1.25 is a synchronous, step up/down, DC/DC switching regulator. It employs a single switch Buck-Boost architecture to generate an output voltage different from the input voltage. The internal control block regulates the output voltage and maintains the output current in an optimal manner. The device is protected from short-circuit, thermal shutdown and output over-voltage conditions.

The device has an internal Regulator and bias Supply. The Regulator has three operating modes: Fixed, Off, and PWM. In fixed mode, the output voltage is regulated to a constant level that is set by variations in the reference voltage. In Off mode, the device is turned off. And in PWM mode, the device is switched on and off to regulate the output voltage. The bias supply is also regulated to maintain a constant output voltage.

The device has a shutdown pin which is used to turn off the device. The shutdown pin can be configured to be active-low or active-high and should be connected to a suitable logic level. Furthermore, the device has an enable pin that can be used to connect to a logic level signal to control the start and stop of the internal switching cycle.

Features:

• Wide input voltage range: 2.5V to 16V
• Wide output voltage range: 2.5V to 14V
• High efficiency up to 95%
• Minimum number of external components
• Output over-voltage and short-circuit protection
• Thermal shutdown
• Lead-free/Halogen-free package
• Precision output voltage accuracy
• Soft-start

Conclusion

The LM3671MFX-1.25 DC/DC switching regulator offers an efficient, simple solution to power management needs. It features a wide input voltage range, high efficiency, and superior transient response. It is suitable for a variety of applications such as fail-safe power supplies, battery-charging applications, microprocessor supplies, and automotive applications. Furthermore, it is available in a compact Lead-Free/Halogen-Free package.

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