LP3947ISD-51 Datasheet, PDF (8/20 Pages) Texas Instruments – LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

LP3947
SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013
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4.3V < V_CHG-IN < 6.0V
and
V_BATT < V_CHG-IN
1.39V < Ts < 2.42V
RLED = On
GLED = Off
Pre-Qualification
Charge Current = 50 mA
1.39V<Ts<2.42V ^N
?
Y
N
V_BATT > 3.0V?
Y
Set Fast Charge Current = I
Start 5.6 hr Timer
Timer =
Y
5.6 hr?
N
1.39V<Ts<2.42V ^N
?
Y
EN pin =
Y
low?
N
N
V_BATT > = 4.1V*?
Y
Constant Voltage Mode
V_BATT = 4.1V *
1.39V<Ts<2.42V ^N
?
Y
Timer =
5.6 hr?
Y
or
EN pin =
low?
N
N _{IEOC < (0.1 x ICHG)*? Y}
4.3V < V_CHG-IN < 6V
Ts t 2.7V
LDO Mode
I_CHG = 1.2A
V_BATT = 4.1V*
LED's Off
V_BATT > V_CHG-IN
Charger Off
LED's Off
Timer time out
Charger = Off Disconnect
Timer resets
power at
RLED = ON _{CHG-IN pin to}
GLED = ON _{restart charger}
1.39V<Ts<2.42V Y
?
N
Battery Temp
violation
Charger = Off
Timer resets
RLED = ON
GLED = ON
1.39V<Ts<2.42V ^N
?
Y
Maintenance Mode
Charger = Off
RLED = Off
GLED = On
V_BATT < 3.9V
Y
and
EN pin =
High?
N
N 1.39V<Ts<2.42V
?
Y
Y
N
V_BATT > 3.0V?
* Default Value. See "I²C Interface" section.
Figure 4. LP3947 Charger Flow Chart
8
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