PRE-CHARGE

[CC MODE]

AND Wait 40 ms for Charger Services

MAINTENANCE

Charger Input Out-of-Range

CHARGER OFF

Restart Condition

FULL-RATE CHARGE

[CV MODE]

Pre-charge Timeout

EOC Condition OR

Fullrate Charge Timeout

BAD BATTERY

Charger Settings:

Safety Timer:

- Pre-charge: 45 min

FULL-RATE CHARGE

[CC MODE]

Pre-Charge to Full-Rate

Charge Transition

Transition to Constant

Voltage-mode

Charging

Current

End-of-Charge

Full-Rate

Current

Battery Voltage

Maintenance

Mode

TIME

Restart

Constant Current

Mode

Pre-Charge

Mode

Constant

Voltage Mode

LP8727

SNVS898A – OCTOBER 2012 – REVISED MAY 2013

www.ti.com

Figure 12. Li-Ion Charging Profile

Figure 13. Charger Operation Diagram

UVLO Operation

UVLO measures system voltages on VBUS and VBAT inputs and compares it to selected voltages. The function

uses 2 comparators. These comparators are combined into UVLO_N state, which can affect startup, cause

shutdown or generate interrupt. UVLO_N state can change on following conditions:

•

If system voltage is lower than UVLO and OPVM, then UVLO_N state is set to '0'; and

22

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