Datasheet

Timer time out
Charger = Off
Timer resets
RLED = ON
GLED = ON
Disconnect
power at
CHG-IN pin to
restart charger
Maintenance Mode
Charger = Off
RLED = Off
GLED = On
1.39V<Ts<2.42V
?
Battery Temp
violation
Charger = Off
Timer resets
RLED = ON
GLED = ON
Set Fast Charge Current = I
Start 5.6 hr Timer
Timer =
5.6 hr?
EN pin =
low?
Y
N
1.39V<Ts<2.42V
?
N
Y
Y
N
Y
N
N
Y
V
BATT
> = 4.1V*?
1.39V<Ts<2.42V
?
N
Y
1.39V<Ts<2.42V
?
N
Y
Constant Voltage Mode
V
BATT
= 4.1V *
Pre-Qualification
Charge Current = 50 mA
RLED = On
GLED = Off
1.39V<Ts<2.42V
?
N
Y
LDO Mode
I
CHG
= 1.2A
V
BATT
= 4.1V*
LED's Off
4.3V < V
CHG-IN
< 6.0V
and
V
BATT
< V
CHG-IN
1.39V < Ts < 2.42V
4.3V < V
CHG-IN
< 6V
Ts t
2.7V
V
BATT
> V
CHG-IN
LED's Off
Charger Off
1.39V<Ts<2.42V
?
N
Y
Timer =
5.6 hr?
EN pin =
low?
Y
N
or
V
BATT
> 3.0V?
N
I
EOC
< (0.1 x I
CHG
)*?
N
* Default Value. See "I
2
C Interface" section.
Y
V
BATT
> 3.0V?
NY
V
BATT
< 3.9V
EN pin =
High?
Y
and
N
Y
LP3947
SNVS298B –NOVEMBER 2004–REVISED APRIL 2013 www.ti.com
Figure 4. LP3947 Charger Flow Chart
8 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated
Product Folder Links: LP3947