LTC3104IMSE#PBF

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Linear voltage regulators and switch controllers are two of the most common voltage regulator types. The LTC3104IMSE#PBF is a hybrid of the two, combining a low quiescent current linear regulator and high efficiency switch controller in a small package. It is a 2.5V to 5.5V single-cell battery charge controller ideal for a wide range of applications. This article will provide an overview of its application fields and explain its working principle.

Application Field

The LTC3104IMSE#PBF can be used as a buck-boost or boost charge controller for single-cell Lithium-ion or lithium polymer batteries. Its wide 2.5V to 5.5V input voltage range makes it suitable for applications requiring battery backup, such as remote sensors and internet of things (IoT) devices. It also features an adjustable maximum system voltage threshold to ensure that the battery cannot overcharge.

Also, the LTC3104IMSE#PBF has an adjustable input current limit and output power limits that allow it to protect the load from current and voltage surges. Its wide pulse width modulation (PWM) range and low quiescent current make it suitable for portable devices such as medical, wearable, and tablet applications. Lastly, due to its wide range of features including above-balanced accuracy, power-good/fault output, and dynamic response limiting, it is suitable for use in solar energy harvesting systems.

Working Principle

The LTC3104IMSE#PBF combines an 82 mV low quiescent current linear IC regulator with a low on-resistance (50mΩ max) 2-phase synchronous DMV switch controller. The linear regulator is capable of providing up to 100 mA of current for direct connection to a battery. The DSM switch controller utilizes a 2-phase or dual-mode switching configuration to drive up to 5A of current to the battery.

The LTC3104IMSE#PBF consists of two main stages, the constant-voltage (CV) loop and the constant-current (CC) loop. The CV loop controls the output voltage of the system. This loop monitors the output voltage and compares it to the VBAT pin voltage. It then adjusts the voltage on an external inductor that controls the battery current.

The CC loop is an adjustable current limit for charging or discharging the battery. It monitors the voltage on the battery and compares it to the voltage at the power input connector. If the input voltage is higher than the battery voltage, it will increase the current limit to ensure the battery is fully charged. Otherwise, it will reduce the current limit to prevent the battery from overcharging.

Conclusion

The LTC3104IMSE#PBF is an ideal single-cell battery charge controller ideal for a wide range of applications requiring battery backup. Its hybrid circuit combines the low quiescent current linear regulator with a high efficiency two-phase synchronous DSM switch controller. Its wide operating range and adjustable power limits allow it to safely charge and discharge a battery for a variety of applications. Furthermore, it is specifically designed for solar energy harvesting systems and medical, wearable, and tablet applications.

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