How do you design a 7.4v lithium battery charging circuit with ANT2801?

ANT2801 is a wide range of input voltage, specifically for double festival lithium battery charging chip without traditional 9 v adapter for special purpose, just standard 5 v adapter. Charging current can be set by the external resistance chip, through external capacitance charging to set the timeout. The power of the low impedance path can make the charging efficiency is higher, reduce charging time and improve the battery service life.ANT2801 can adaptive adapter's current supply ability to automatically adjust the charging current, can not only ensure the input adapter will not appear overload phenomenon, and can display adapter maximum current ability, so is suitable for all kinds of DC equipment and standard USB charging equipment.

ANT2801 adaptive 5 v charger or USB interface 5 v function. That is less than 100 ma / 5 v charging equipment through ANT2801 can give two lithium electricity7.4 V normal charging series; Greater than 2 a / 5 v charging device can automatically through ANT2801 improve charging current, charging time. The diagram below 5 V charger current (Input current) with two li-ion battery series 7.4 V charging current (Charge Current) relationship (typical) :

ANT2801 internal charging management part adopts a set of complete and reliable charging mechanism. Whether the battery connection can work normally without external compensation to realize the stability of the chip. In the process of electricity, first of all, VIN for VOUT charging, when reach the VIN, SW started working shocks, realize booster function, when VOUT, began to detect VBATT condition.

1) VBATT < 6 v, a trickle charging phase to begin.

2) 6 VBATT 8.4 V or less, or less constant current charging phase to begin.

In the process of charging, CHG_LEDpin between VLDO leds will be kept normally on, after charging, the LED will go out. Charging timeout, LED flashing of fixed frequency state, charging timeout refers to for a long time due to fault charging can't charge, after reaching set the time, LED flashing alarm.

Charging voltage:

1) if the VBATT > 6.8 V, VOUT will higher than VBATT 300 mv, the purpose is to set the decrease of the maximum charging tube during the period of rapid charging power consumption, improve the charging efficiency.

2) if the VBATT < 6.8 V, VOUT is fixed at 7.1 V, recharge batteries provide driving ability.

Automatic recharge:

After a charge cycle, ANT2801 will display close the charging state, in the meantime, the battery may be because natural discharge capacity decline, in order to ensure that the battery will not because the connection adapters, power automatically run out, when the battery voltage drops to automatic charging threshold (typically 8.23 V), a new charge cycle will begin automatically.

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