LT3905EUD#PBF

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LT3905EUD#PBF Application Field and Working Principle

The LT3905EUD#PBF is a type of DC-DC switching regulator and is a monolithic integrated circuit. It is designed to operate from a single cell Li-Ion or Li-Ion/Polymer battery and has the capability of producing output voltages as low as 0.6V. The LT3905EUD#PBF is a synchronous Buck Switching regulator, providing constant output voltage and high efficiency operation. The LT3905EUD#PBF can provide maximum output currents up to 200 mA, with an operating frequency from 200 kHz to 1 MHz.

The LT3905EUD#PBF has several different applications, including powering small to medium-sized portable systems where high efficiencies are important. It is also ideal for battery-powered systems that require low power dissipation and power conversion efficiency in order to extend battery life. This device is also suitable for low Power LED lighting applications, requiring low output voltages. The LT3905EUD#PBF has a wide input voltage range and is able to support two different input voltage levels.

Working Principle

The LT3905EUD#PBF is a synchronous Buck Switching Regulator, using pulse width modulation (PWM) to switch the output voltage between two different levels. It is able to efficiently convert input voltages from 0.7V to 5.5V to output voltages ranging from 0.6V to battery voltage. The device consists of an inductor, a switch, an output capacitor, and a rectifier. When enabled, the PWM pulse width modulation circuit turns the switch on and off periodically. Electrons then flow from the input through the inductor and diode to the output. When current flows through the inductor, it creates a magnetic field which then stores energy in the inductor. When the switch is turned off, this stored energy is released in the form of current to the output, thus allowing the voltage to remain as steady as possible at the load.

The LT3905EUD#PBF features an integrated low noise current-mode switching architecture to deliver high efficiency, low EMI emissions and excellent line and load regulation. It includes an adjustable Soft-Start feature which is used to reduce output voltage overshoot and inrush current when the device is first turned on. The device also includes foldback protection which reduces the output current at a specified limit and restart when the fault is cleared.

The LT3905EUD#PBF is designed to be low power, high efficiency, and has a wide input voltage range to support single cell Li-Ion/Polymer and LiFePO4 batteries. It is optimized for operation over a wide temperature range, from -40°C to 85°C.

Conclusion

The LT3905EUD#PBF is a synchronous Buck Switching regulator designed for single cell Li-Ion or Li-Ion/Polymer battery powered systems. It is an excellent choice for low power LED lighting applications. It features an integrated low noise current-mode switching architecture that delivers high efficiency, low EMI emissions and excellent line and load regulation. It is optimized for operation over a wide temperature range, from -40°C to 85°C. The LT3905EUD#PBF is a great choice to power small to medium-sized portable systems where high efficiencies are important.

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