LTC4008EGN-1#TRPBF

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Power management ICs (PMICs) are integrated circuits (ICs) designed to provide direct-current power supplies for a wide range of applications. One of the most important types of PMICs is the battery charger. Among them is the LTC4008EGN-1#TRPBF battery charger, which provides a complete system solution for good battery life, safety, increased capacity and improved performance. This article will explain the application field and working principle of the LTC4008EGN-1#TRPBF battery charger.

Application field

The LTC4008EGN-1#TRPBF is a multicell linear battery charger that provides one-cell to five-cell Li-ion/ Li-polymer battery charging with a single or dual cell sense option. It charges up to four Li-ion/ Li-polymer cells in parallel and provides individual cell regulation. The charger offers adjustable total charge currents via an external precision resistor divider. It supports NTC monitoring, timer and full/trickle modes. The LTC4008EGN-1#TRPBF can charge four cell, Li-ion and Li-polymer batteries in any combination, such as four Li-ion/ Li-polymer cell, two Li-ion/ Li-polymer cell and one Li-ion/ Li-polymer cell. It also works with single cells and enables Li-ion RE and RE/RV cell with synchronous rectification, plus individual cell regulation capability.

The LTC4008EGN-1#TRPBF is ideally suited for cell phones and portable electronic devices, as well as other applications that require battery management. It is ideal for portable medical and industrial applications, such as power tools, cordless handheld devices, emergency medical equipment, home security applications and many more. The LTC4008EGN-1#TRPBF is also a great choice for industrial and automotive applications that require a universal and reliable batteries charger.

Working principle

The LTC4008EGN-1#TRPBF battery charger is based on a constant-current/constant-voltage pulse-width modulated (PWM) architecture. The charger is comprised of a power stage, a constant-current regulator, a control block and a protection block. It controls the power stage by measuring the voltage at the feedback node and setting the VREF to set the output voltage. Conversely, it adjusts the voltage at the input of the power stage and limits the output current by changing the gate voltage of the power MOSFET.

The LTC4008EGN-1#TRPBF provides fast charging and pre-charging with constant current and constant voltage charging. During the pre-charge phase, the charger will deliver a fixed current of up to 1700mA, until the system reaches 4.2V per cell. When sufficient voltage is reached, the system switches to the constant voltage charging phase, where the current will be reduced gradually towards the selected charge current. The charger then maintains the constant voltage until the charge time limit is reached or the temperature threshold is exceeded. Either of the two will result in the charger switching to the float charge stage. The float charge stage reduces the output current to a low level and maintains voltage at 4.2V per cell.

The LTC4008EGN-1#TRPBF gives the user the capability of monitoring the charge current, charge voltage and charge status. A cell balancing monitor monitors the balance of individual cells and is used to reduce the total charge time and optimize the charge quality. In addition, the charger offers temperature monitoring, LED display and other protection features such as over temperature, over voltage, overcurrent and short circuit protection. It also provides a fault log and diagnostics feature, which can help diagnose issues during the charging process. The LTC4008EGN-1#TRPBF also features an NTC monitoring option as well as a timer option, which can help keep the battery free of aging overcharging.

Conclusion

The LTC4008EGN-1#TRPBF from Linear Technology is one of the most reliable and versatile battery charger ICs on the market. It is specifically designed for one to five cell Li-ion/Li-polymer battery charging with a single or dual cell sense option and provides adjustable total charge currents. The LTC4008EGN-1#TRPBF also offers NTC monitoring, timer and full/trickle modes and also provides over current, over voltage, over temperature and short circuit protection. This charger is suitable for many different types of applications and its features make it a reliable and secure choice for any battery charging needs.

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