ia3513 integration, ia3513 Datasheet - Page 8

• Manufacturer Part Number: ia3513
• Description: Headset Voice And Power Solution
• Manufacturer: integration

Battery Charger Functional Descriptions
Charge Qualifying
Safety Mode
Pre-charge Mode
Constant Current Mode (Fast Charge)
Constant Voltage Mode
Restart Mode
Fold-Back Mode
Charge Profile
During qualifying, a small current (C/100) is injected into the battery; if the battery pin is above VbatOpen then the battery
is open. If the battery voltage is below VbatShort then the battery is shorted. In either case charge is terminated with the
appropriate error code. During qualifying, IC temperature and supply voltage are also checked.
All the conditions checked during Qualifying Mode are also monitored during the rest of the charge cycle. If at any time the
safeties are triggered, the charger enters Security Mode, where it waits for the acceptable conditions to be restored, or a
time-out. If the time-out is reached, charge is terminated with the appropriate error code.
Before Fast Charge, the charger applies a Pre-charge current of C/10 to safely “revive” deeply discharged batteries. This
mode is terminated when the battery voltage reaches VbatLowest or by time-out. In the first case the charger goes to
Constant Current Mode, in the second, charge is terminated with the appropriate error code.
The Battery is charged at 1C (externally defined current). This mode is terminated when battery voltage reaches VbatSet,
or by time-out. The first case changes the charger to Constant Voltage mode, the later yields an error, with the appropriate
code. During this mode current fold-back (due to high IC temperature) can occur.
The Battery is charged with a constant voltage, but the current is still limited to 1C. This mode is terminated either by
minimum current, or by time-out. This is the last mode, charge termination. Although in this case time-out is not an error,
the charge termination method is still available by register read. During this mode current fold-back (due to high IC
temperature) can occur.
If the “Restart Allowed” flag is high, the circuit enters a battery monitoring mode, where it waits for the battery voltage to
reach Vrestart and then charge restarts. If the flag is low, charge is terminated.
During the charging procedure, the IC temperature can increase to unsafe temperatures due to higher dropout in the pass-
device. To allow charging with higher input voltages, IC temperature is monitored when it reaches FBTemp the charge
current is lowered until a safe operating temperature is reached. This is not a mode per se, it operates in the constant
current and constant voltage modes.
IA3513
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