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PMIC - Battery Chargers

Today’s mobile devices are power hungry, demanding fast charging and energy efficiency. These demands require robust and reliable battery charging solutions. The LTC4070IDDB#TRMPBF provides a very reliable, safe, energy efficient and cost effective solution to these demands.

Application Field

The LTC4070IDDB#TRMPBF is a highly integrated, low quiescent current linear charger for single cell Li-ion and LiPolymer batteries. Its dual input topology allows it to charge from either a USB port or adapter. It is designed for use in many applications such as cell phones, Bluetooth/ Wi-Fi headsets, PDAs, laptops and digital still cameras. With its wide input voltage range, it can accept 5V to 14V input voltages.

Working Principle

The charger has a dual input topology, meaning that it is capable of charging from either a USB port or an adapter. The device uses a linear regulator to control the charging current, so that the voltage is adjustable. If the input voltage is lower than the battery voltage the regulator will turn off, and the battery will be trickle charged by the supply. The control loop contains overvoltage, overload and overtemperature protection.

The device also features an automatic input voltage detection and overvoltage protection circuit. This features monitors the input voltage and will not charge the battery if the voltage is too high. It also has a low power standby mode, so that the device is not consuming current when the battery is not in use.

The LTC4070IDDB#TRMPBF is controlled by a digital Pulse Width Modulator (PWM). This allows the charging current to be adjustable and the device can detect both the presence of the USB port as well as the adapter. The current can be set within a wide range, from 500mA to 2000mA. This range helps to eliminate the need of choosing multiple charge profiles for different types of battery applications.

Conclusion

The LTC4070IDDB#TRMPBF is a highly integrated, low quiescent current linear charger for single cell Li-ion and LiPolymer batteries. It provides a robust, reliable and cost effective solution to the demands of today’s mobile devices. Its dual input topology allows it to charge from either a USB port or an adapter, and its adjustable charging current ranges from 500mA to 2000mA. With these features, the LTC4070IDDB#TRMPBF is an ideal choice for charging mobile devices.

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