LTC4088EDE-2#TRPBF

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The LTC4088EDE-2#TRPBF battery charger is a highly integrated, single-channel monolithic, synchronous buck battery charger for 1-cell Li-Ion and Li-Polymer applications. With its innovative architecture, it can deliver up to 2A of charging current from a single inductor. To help protect the safety and reliability of the system, the LTC4088EDE-2#TRPBF includes a thermal regulation system, reverse blocking, output current limit and charge status indicator, such as LED. LTC4088EDE-2#TRPBF provides an ideal for various portable devices and applications.

Application Field

LTC4088EDE-2#TRPBF battery charger is widely used in portable applications with ultra low current. It is widely used in applications such as hearing aids, Bluetooth headsets, smart watches, fitness trackers, RFID tags and many more. The device also supports input DC sources ranging from 4.5V to 36V and can be configured to charge 1-cell Li-Ion batteries with 0.5A, 1A or 2A of fast charging current. The device supports many advanced features such as thermal regulation and charge control, reverse blocking and so on, which make it suitable for applications with stringent safety and reliability requirements.

Working Principle

The LTC4088EDE-2#TRPBF battery charger utilizes a synchronous buck topology. The device has two principal power components-switching MOSFETs and an inductor. The duty cycle of the MOSFETs is controlled by the external voltage present on the EN/UVLO pin, which is the output of a buffer. When the EN/UVLO voltage rises high enough, the switcher turns on, allowing power to be transferred from the input to the output by the inductor. The current flowing through the inductor then creates a magnetic field which stores energy until the MOSFET is turned off. The stored energy is released as output current is drawn from the output by the battery or load. In order to maintain a constant charge current, the output voltage to the battery is regulated by sensing the current over a resistor.

The thermal regulation feature ensures that the battery charger is not subjected to excessive power dissipation or heat. It utilizes the internal drain-source voltage of the MOSFETs (VDS) to trigger an internal circuit, which limits the duty cycle of the MOSFETs. Once the power dissipation at the MOSFETs is reduced, the duty cycle is increased and the charging current is restored to its previous level. The reverse blocking feature allows the battery charger to be safely operated in reverse, making it ideal for applications with mixed power sources.

The LTC4088EDE-2#TRPBF battery charger also includes a charge status indicator (LED) to easily monitor the state of charging. The LED will turn on when the battery voltage reaches the charge voltage threshold and will turn off when the charging current falls below the minimum level.

Conclusion

The LTC4088EDE-2#TRPBF battery charger is a highly integrated, synchronous buck battery charger designed for single-cell Li-ion and Li-polymer applications. It is suitable for portable applications with ultra low current and supports many advanced features such as thermal regulation, charge control, LED charge status indicator and reverse blocking. Overall, the LTC4088EDE-2#TRPBF is an ideal solution for 1-cell Li-Ion and Li-Polymer applications.

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