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Introduction to the Midastek MSB20L7 Battery Management Chip 2016-01-04

Mobile devices have become very widespread in recent years. Almost everyone uses mobile products like smart phones and tablets, but when we are making a call on a smart phone or watching a video on a tablet away from home, the last thing we want to happen is the battery to go dead. To avoid the problem of smart phones or tablets running out of power, power banks have become an important accessory for these mobile devices.  At the same time, increases in the battery capacity of mobile devices means ordinary chargers are no longer fast enough. Faster charging rates and shorter charging times are therefore an inevitable future product trend. The latest MSB20L7 battery management chip from Midastek can be used for quick charge solutions and complies with the QC 2.0 charging protocol defined by Qualcomm.

As shown in Fig.1, the Midastek MSB20L7 QC 2.0 quick charge solution combines a micro-processor, voltage boost controller and automatic QC 2.0 detection into one chip. Here the micro-controller detects the lithium battery’s input and output voltages, battery level display and output over-current protection. The solution uses the 18650 lithium battery which is the most commonly used rechargeable battery today. Multiple lithium batteries can also be linked in together to achieve higher voltages and capacities. Power banks for example combine multiple lithium batteries together to achieve very high capacities. The strengths of Lithium battery include high energy density, low self-discharge rate, no memory effect, long life, and its light weight, making it a very suitable power source for mobile products.  The MSP MP2615 battery charger IC is a highly integrated switching lithium battery charger IC.  It offers high precision current and voltage regulation with an efficiency of up to 90% for a charging current of 2A. The MSB20L7 combined with an external MOSFET provides high-efficiency DC-DC voltage conversion control. MSB20L7 can automatically detect whether the connected mobile phone supports QC 2.0. If the mobile phone's charger mechanism does not support QC 2.0 then MSB20L7 will use the normal 5V charging mechanism. Under the QC 2.0 Class A protocol, the three charging voltage modes are 5V, 9V and 12V.

Strong growth in mobile devices means higher requirements for power bank functions and specifications as well. Efficient charging and discharging has therefore become a key area of development for all vendors. The all-in-one battery management chip solution developed by Midastek can help customers lower costs and speed up product R&D time.

                                                    Figure 1: Midastek power bank quick charge solution

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