LTC4078XEDD#TRPBF

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The LTC4078XEDD#TRPBF is a series of low-dropout (LDO) battery chargers designed to charge a single-cell lithium-ion or lithium-polymer batteries with an input voltage range of 2.7V to 6V. It features a highly accurate linear charging current regulating loop and is capable of up to 1A of output current.

The LTC4078XEDD#TRPBF is ideal for charging a single-cell Li-ion or Li-Polymer battery from a USB supply, wall-adapter, or other low-voltage source. Its small footprint, low power, and high accuracy make it ideal for portable devices. Additionally, the LTC4078XEDD#TRPBF includes over-current, reverse-current, and short-circuit protection, as well as thermal shutdown for added safety.

Application Fields

The LTC4078XEDD#TRPBF series of battery chargers can be used in a wide range of applications. Its low power, small footprint, and high accuracy makes it ideal for portable and battery-powered devices. It is suitable for charging single-cell Li-ion and Li-Polymer batteries in string applications. The integrated over-current, reverse-current, and short-circuit protection, as well as thermal shutdown make it safer and more reliable in applications with varying environmental conditions.

Working Principle

The LTC4078XEDD#TRPBF series of battery chargers use a low-dropout linear regulating loop to regulate charging current. This is done by monitoring a signal at the transistor base of a PMOS transistor. The current sense resistor, together with the accurate reference voltage, provides an accurate charging current regulation. The transistor switches between two different states: shutdown mode and charge mode. In shutdown mode, the PMOS transistor is turned off and the charging output is disabled. In charge mode, the PMOS transistor is turned on and charging begins. The output voltage is monitored and compared with the input voltage in order to determine the battery\'s charging state. The latter is used to adjust the charge current in order to ensure that overcharging does not occur.

The LTC4078XEDD#TRPBF series of battery chargers also includes additional features such as over-current, reverse-current, and short-circuit protection, as well as thermal shutdown for added safety. These features allow for reliable operation in applications with varying environmental conditions.

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