LT1940LEFE#PBF

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LT1940LEFE#PBF Application Field and Working Principle

LT1940LEFE #PBF belongs to the category of PMIC (Power Management Integrated Circuits) - Voltage Regulators - and DC DC Switching Regulators. It is a high-efficiency , low-noise linear step-down regulator with internal oscillator.

This device has two main application fields. The first one is as a high-efficiency DC/DC converter for computing and consumer applications, and the other as a linear regulator for portable devices. The high level of efficiency provided by the device is obtained by means of a set of internal switches using a current-mode control.These switches produce output voltages that range between 0.8 to 30 Volts.

LT1940LEFE#PBF Working Principle

The device works in a current-mode switching regime. The internal power switching is provided by a pair of n-channel MOSFETs, that act as a low-side switch and a high-side switch. When the low-side switch is on, the high-side switch is off. This is possible due to the oscillator feature which provides a constant frequency of operation.

In order to regulate the output voltage, the LT1940LEFE#PBF makes use of a feedback system. The output voltage is monitored by an error amplifier which compares it against a reference voltage, producing an error signal. This error signal is used to adjust the duty cycle of the switching power stages, thus regulating the output voltage.

The wide range of output voltages that can be produced by this device depends on the reference voltage used in the feedback system. This voltage is set by the user, allowing a broad range of application fields.

The LT1940LEFE#PBF also features a 0.8V start-up voltage, which allows the device to self-start in demanding power-up and power-down scenarios. This is crucial for applications that require low start-up voltages.

Conclusion

The device is a linear step-down regulator with an integrated oscillator, belonging to the category of PMIC (Power Management Integrated Circuits) - Voltage Regulators - and DC DC Switching Regulators. It provides a high efficiency, low noise and a wide output voltage range. This makes it ideal for applications that require a high-efficiency DC/DC converter, as well as portable devices that require a linear regulator.

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