LP3918 Datasheet, PDF (10/30 Pages) National Semiconductor (TI) – Battery Charge Management and Regulator Unit

Charger Electrical Characteristics
Unless otherwise noted, V_CHG-IN = 5V, V_IN ( = VIN1 = VIN2 = BATT) = 3.6V.C_{CHG_IN} = 10µF, C_BATT = 30µF. Charger set to default
settings unless otherwise noted. Typical values and limits appearing in normal type apply for T_J = 25°C. Limits appearing in
boldface type apply over the entire junction temperature range for operation, T_a = T_J = −25°C to +85°C. (Notes 6, 9)
Symbol
Parameter
Condition
Limit
Typ
Units
Min
Max
V_CHG-IN
Input Voltage Range
Operating Range
4.5
6.5
V
4.5
6
V_{OK_CHG}
CHG_IN OK trip-point
V_{CHG_IN} - V_BATT (Rising)
200
mV
V_{CHG_IN} - V_BATT (Falling)
50
V_TERM
Battery Charge
Termination voltage
Default
4.2
V
V_TERM voltage tolerance T_J = 25°C
T_J = 0°C to 85°C
I_CHG
Fast Charge Current
I_CHG = 450mA
Accuracy
-0.35
+0.35
%
-1
+1
-10
+10
%
Programmable full-rate
charge current range
(default 100mA)
6.0V ≥ V_{CHG_IN} ≥ 4.5V
V_BATT < (V_{CHG_IN} - V_{OK_CHG})
V_{FULL_RATE} < V_BATT < V_TERM
(Note 10)
50
950
mA
Default
100
Charge current
50
programming step
I_PREQUAL
I_{CHG_USB}
Pre-qualification current V_BATT = 2V
50
40
60
mA
CHG_IN programmable
current in USB mode
5.5V ≥ V_{CHG_IN} ≥ 4.5V
Low
V_BATT < (V_{CHG_IN} - V_{OK_CHG})
100
mA
V_{FULL_RATE} < V_BATT < V_TERM High
450
Default = 100mA
100
V_{FULL_RATE}
Full-rate qualification
V_BATT rising, transition from pre-qual
3.0
2.9
3.1
threshold
to full-rate charging
V
I_EOC
End of Charge Current, % 0.1C option selected
10
%
of full-rate current
V_RESTART
Restart threshold voltage V_BATT falling, transition from EOC to
4.05
3.97
4.13
full-rate charge mode. Default options
V
selected - 4.05V
I_MON
T_REG
I_MON Voltage 1
I_MON Voltage 2
Regulated junction
temperature
I_CHG = 100mA
I_CHG = 450mA
(Note 7)
0.247
V
1.112
0.947
1.277
115
°C
Detection and Timing (Note 7)
T_POK
Power OK deglitch time V_BATT < (V_CC - V_{OK_CHG})
32
mS
T_{PQ_FULL}
Deglitch time
Pre-qualification to full-rate charge
230
mS
transition
T_CHG
Charge timer
Precharge mode
1
Hrs
Full Rate Charging Timeout
5
Constant Voltage Timeout
5
T_EOC
Deglitch time for end-of-
charge transition
230
mS
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