MAX713CPE

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PMIC - Battery Chargers

• MAX713CPE application field and working principle

  The purpose of this article is to discuss the application field and working principle of MAX713CPE. MAX713CPE is a popular current-mode linear battery charger integrated circuit developed by Maxim Integrated that offers a broad range of charging solutions for Notebook, Netbook, Tablet Personal Computer, and other industrial applications. Its complete charge cycle comprises of three different phases: pre-charge, fast-charge, and float-charge. In the pre-charge phase, it starts with a low charge current to protect the battery from overshooting and to prevent any damage caused by high current. In the fast-charge phase, the charge current is increased linearly until the current reaches the set threshold. In the float-charge phase, the battery is monitored to keep the battery in a steady state and prevent any overcharging.

  The MAX713CPE consists of a current regulation loop, a voltage regulation loop, a temperature control loop, a charge monitoring loop, and additional support circuitry for controlling and monitoring the charging process. The current regulation loop is used to keep the battery current at a safe level by varying the drive to the switch regulator. The voltage regulation loop is used to keep the battery voltage at the pre-defined value by controlling the current regulation loop and charge monitoring loop. The temperature control loop is used to monitor and adjust charging parameters based on the battery temperature. The charge monitoring loop is used to monitor the charging voltage and current in order to protect the battery from any damage caused by overcharging. Finally, the additional support circuitry provides additional protection by monitoring the battery overvoltage and shutting off the power to the circuit if the limit is exceeded.

  The MAX713CPE has an absolute maximum input voltage of 32V and a maximum operating temperature range from 0 to 70°C. It is available in a 14-pin DIP package and is RoHS compliant. The MAX713CPE is a highly advanced linear battery charger solution for notebooks, netbooks, tablets and other similar applications.

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