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BQ24295: Power management using bq24295

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Part Number:BQ24295

Hello,

I want to build management battery circuit which can deliver power to :

- The main system (3.3V)

- Battery (Li-Polymer, 1 cell, 2800 mAh, 3.7 V)

- External device via USB-A (5V - 1A max)

Several use cases must be taken into consideration : 

- When the adaptor mini-USB cable is plugged into the power bank, the charger initiates the D+D- detection to determine the input current capability and set the charger input current not to exceed the detected value. If the external device is attached to a Type-A USB terminal via cable, the adapter current will guarantee the bypass phone charging-only the remaining extra power will charge the battery.

- The power bank operating in boost mode, when the adapter is unplugged and the battery voltage is boosted to around 5V to charge the external device. 

- The main system should always be powered

The bq24295 is the best candidate, but I am would like to understand how this chip can switch to the boost mode when the adapter is removed. I want to control all mode without software control.

Thank you in advance for your feedback


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