LTC3553EPD#PBF

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LTC3553EPD#PBF Application Field and Working Principle

The LTC3553EPD#PBF is a positive voltage step-up dc/dc converter designed to charge a single-cell input lithium-ion (Li-ion) battery or other low-voltage input sources. It is the ideal solution for applications that require very low output current, high voltage and fast transient response.

Application Field

The LTC3553EPD#PBF is a PMIC – Power Management – Specialized solution that can be used in a variety of portable devices and applications. It features both an input voltage range of 3 V to 4.2 V and an output voltage range of 3.2 V to 40 V.

The LTC3553EPD\'s small 4 mm x 4 mm package includes all of the necessary components for powering a single-cell Li-ion battery and other low-voltage input sources. The board size is also minimized by the integrated low loss, low voltage drop synchronous rectifiers and minimal external components.

It also features a low quiescent current of 1 µA and up to 95% conversion efficiency. This makes it an ideal solution for power-sensitive applications such as cell phones, PDAs, digital and optical cameras and medical monitoring systems.

Working Principle

The LTC3553EPD#PBF step-up dc/dc converter works by converting a low input voltage, such as 3V, to a higher output voltage, such as 40V. The converter uses a synchronous rectifier to minimize power losses and is controlled by an open-loop regulating circuit.

The input voltage is applied to the inductor and the output capacitor, which stores energy during each cycle. The output voltage is monitored by a feedback voltage divider, and the circuit adjusts the duty cycle of the converter to maintain the desired output voltage.

In addition, the device features a wide frequency range of up to 2MHz, allowing it to charge the Li-ion battery quickly. It also features a low input start-up current of 500 nA and a low output ripple of 20 mV.

The LTC3553EPD#PBF is also designed with a number of safety features, such as thermal protection, over-voltage protection and under-voltage lockout. This ensures that the device is safe for use in various applications.

Conclusion

The LTC3553EPD#PBF is an ideal solution for powering single-cell Li-ion batteries and other low-voltage input sources. It features a wide range of features, such as a low quiescent current, wide frequency range and safety features. With its small size and low power consumption, it is a great solution for applications that require fast charging and reliable performance.

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