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  Date: 08/06/2014

USB charger IC with fuel gauge

The new switching charger IC DA9150 from Dialog is integrated with ARM Cortex M0 processor for power management and a fuel gauge to know the battery charge levels. The fuel gauge is said to be 99% accurate in measuring battery state of charge.

This CC and CV fast charger is based on a 3MHz DC/DC converter with small 1H inductors can charge single-cell Lithium-ion batteries, with a maximum charging current of 2 A. With efficiency of above 90% , DA9150 supports completely autonomous charging from a 5 V input supply and includes a power supply adaptation feature which enables it to charge from a broad range of power supplies including 5 V USB battery charging specification v1.2 compliant supplies and find the optimal operating point. The integrated over-voltage protection allows voltages of up to 24 V.

This device supports LTE data dongles or USB memory sticks by having a buck converter can operate in reverse mode, which enables DA9150 to supply 5 V to VBUS for USB OTG functionality with an output current of up to 1 A.

The concept of combining a fuel gauge with charging functions exploits many synergies of battery-related functions within a smartphone design. Furthermore, the introduction of the DA9150 supports our ongoing strategy of low-cost smartphone initiatives to address the fast-growing China smartphone LTE market, said Udo Kratz, Senior Vice President and General Manager, Business Group Mobile Systems at Dialog.

DA9150 introduces innovative monitoring features using a 10-Bit ADC in combination with 4 GPIO pins. System parameters such as real charging current, VBUS and system voltages, power consumption of the application and temperatures are made available to the processor via an I2C interface.

The DA9150 as safety features such as temperature-dependent charge profiles compliant with the JEITA standard, thermal supervision of the charger itself, short circuit protection, and safety timers to protect the battery. The device operates in a temperature range of -40C to 85C and comes in a small 4x4 mm QFN package.

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