LP3923_15 Datasheet, PDF (18/37 Pages) Texas Instruments – Cellular Phone Power Management Unit

LP3923
SNVS567B – APRIL 2010 – REVISED MAY 2013
www.ti.com
Table 10. The following table summarizes the supported currents for LP3923.
PROG_ ICHG[4]
1
1
1
1
1
1
1
PROG_ ICHG[3]
0
0
0
0
0
0
0
(continued)
PROG_ ICHG[2]
PROG_ ICHG[1]
0
0
0
1
0
1
1
0
1
0
1
1
1
1
PROG_ ICHG[0]
1
0
1
0
1
0
1
ICHG (mA)
900
950
1000
1050
1100
1150
1200
VTERM[1]
0
0
1
1
Table 11. Charging Termination Voltage Programming
VTERM[0]
0
1
0
1
V_TERM
4.1
4.2 (Default)
4.3
4.4
Table 12. End of Charging Current Programming
PROG_EOC[1]
0
0
1
1
PROG_EOC[0]
0
1
0
1
(1) C is the programmed charging current.
I_EOC ⁽¹⁾
0.05C
0.1C
0.15C (Default)
0.2C
PROG_VRSTRT[1]
0
0
1
1
Table 13. Charging Restart Voltage Programming
PROG_VRSTRT[0]
0
1
0
1
Restart Voltage (V)
V_TERM −50 mV
V_TERM −100 mV (Default)
V_TERM −150 mV
V_TERM −200 mV
PROG_CHGTIME[1]
0
0
1
1
Table 14. Charge Timer Programming
PROG_CHGTIME[0]
0
1
0
1
Charging Timer (Hrs)
Disabled
2
5 (Default)
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.
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