LP3923

SNVS567B – APRIL 2010 – REVISED MAY 2013

www.ti.com

Table 10. The following table summarizes the supported currents for LP3923.

(continued)

PROG_ ICHG[4]

PROG_ ICHG[3]

PROG_ ICHG[2]

PROG_ ICHG[1]

PROG_ ICHG[0]

ICHG (mA)

1

0

0

0

1

900

1

0

0

1

0

950

1

0

0

1

1

1000

1

0

1

0

0

1050

1

0

1

0

1

1100

1

0

1

1

0

1150

1

0

1

1

1

1200

Table 11. Charging Termination Voltage Programming

VTERM[1]

VTERM[0]

VTERM

0

0

4.1

0

1

4.2 (Default)

1

0

4.3

1

1

4.4

Table 12. End of Charging Current Programming

PROG_EOC[1]

PROG_EOC[0]

IEOC

(1)

0

0

0.05C

0

1

0.1C

1

0

0.15C (Default)

1

1

0.2C

(1)

C is the programmed charging current.

Table 13. Charging Restart Voltage Programming

PROG_VRSTRT[1]

PROG_VRSTRT[0]

Restart Voltage (V)

0

0

VTERM −50 mV

0

1

VTERM −100 mV (Default)

1

0

VTERM −150 mV

1

1

VTERM −200 mV

Table 14. Charge Timer Programming

PROG_CHGTIME[1]

PROG_CHGTIME[0]

Charging Timer (Hrs)

0

0

Disabled

0

1

2

1

0

5 (Default)

1

1

8

BATTERY CHARGE MANAGEMENT

A charge management system allowing safe charge and maintenance of a Li-Ion battery is implemented on the

LP3923. It has a CC/CV linear charge capability with programmable battery regulation voltage and end of

charging current threshold. A maintenance mode utilizing programmable restart voltage levels enables the

battery voltage to be maintained at the correct level. The charging current in the constant voltage mode is

programmable from 50 mA to 1.2A in 50 mA steps.

If PMU is started without a battery, and the battery is attached later, the charging current should be programmed

once more; otherwise, the charging current will be the same as without a battery.

18

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