LM3420M5-12.6 Integrated Circuits (ICs)

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The LM3420M5-12.6 is an ideal solution for battery charger applications requiring wide input voltage range, highly accurate regulation voltage, low quiescent current, excellent line and load regulation, and fast transient response. This battery charger can be used to charge single cell Li-Ion/Li-Pol battery packs with a wide input voltage range from 4.5V to 28V. It is a pulse width modulation(PWM) charge controller with high accuracy, fast response time, and low quiescent current.

Application Fields

The LM3420M5-12.6 is suited for a variety of applications such as: portable media players, cell phones, and other handheld/wireless devices. Its wide input voltage range allows for flexibility in design, as users can optimize the charger for their specific application. With excellent transient response and fast line/load regulation, the LM3420M5-12.6 provides high efficiency and accuracy. Additionally, battery ports with double protection, temperature monitor, and output current limit functions give users more flexibility in design.

Working Principle

The LM3420M5-12.6 features dedicated control and logic circuits that sense the input voltage, system temperature, and output current. A low power PWM charge controller sets the output voltage. During a normal charging condition, the PWM controller pulls the switch high when the output voltage exceeds the programmed value, and pulls the switch low when the voltage has dropped to the programmed level to maintain a constant output voltage. In addition, the thermal protection circuit shuts down the charge current when the system temperature is too high, while the over current protection circuit will shut down the charge current when the output current is higher than the programmed value. These added functions help protect the battery during charging and make it possible to get more accurate charging conditions.

The LM3420M5-12.6 uses a separate battery charging and monitoring IC to provide a complete solution. Battery monitoring ICs monitor battery voltage, charge current, input voltage, charge status, and system temperature. The monitoring IC can be programmed for maximum/minimum voltage and current, and can provide feedback about the battery charge status. This avoids overcharging by monitoring the voltage and current, and can help to provide a safe charging environment.

Conclusion

In conclusion, the LM3420M5-12.6 is a highly efficient and accurate battery charger for a wide variety of applications. Its wide input voltage range, highly accurate regulation voltage, low quiescent current, excellent line and load regulation, and fast transient response make it ideal for Li-ion/Li-pol battery packs. With its dedicated control and logic circuits and separate battery charging and monitoring ICs, users can be assured of a safe and reliable charging environment. As such, the LM3420M5-12.6 is an excellent solution for battery charger applications.

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