LP3921 Datasheet, PDF (11/34 Pages) National Semiconductor (TI) – Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

Charger Electrical Characteristics
Unless otherwise noted, V_CHG-IN = 5V, V_IN (=VIN1=VIN2=BATT=VDD) = 3.6V.C_{CHG_IN} = 10 µF. 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
(Note 7)
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 Default
4.2
V
voltage
V_TERM voltage tolerance
T_J = 0°C to 85°C
I_CHG
Fast Charge Current
I_CHG = 450 mA
Accuracy
-1
+1
%
-10
+10
%
Programmable full-rate
6.0V ≥ V_{CHG_IN} ≥ 4.5V
charge current range (default
100 mA)
V_BATT < (V_{CHG_IN} - V_{OK_CHG})
V_{FULL_RATE} < V_BATT < V_TERM
(Note 10)
50
950
mA
Default
100
Charge current programming
50
step
I_PREQUAL
I_{CHG_USB}
Pre-qualification current
V_BATT = 2V
50
40
CHG_IN programmable
5.5V ≥ V_{CHG_IN} ≥ 4.5V ^Low
current in USB mode
V_BATT < (V_{CHG_IN} -
100
V_{OK_CHG})
V_{FULL_RATE} < V_BATT <
V_TERM
High
450
Default = 100 mA
100
60
mA
mA
V_{FULL_RATE}
Full-rate qualification
threshold
V_BATT rising, transition from pre-
3
qual to full-rate charging
2.9
3.1
V
I_EOC
End of Charge Current, % of 0.1C option selected
10
full-rate current
%
V_RESTART
Restart threshold voltage
V_BATT falling, transition from EOC
4.05
3.97
4.13
to full-rate charge mode. Default
V
options selected - 4.05V
I_MON
T_REG
I_MON Voltage 1
I_MON Voltage 2
Regulated junction
temperature
I_CHG = 100 mA
I_CHG = 450 mA
(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
Charging Timeout
5
T_EOC
Deglitch time for end-of-
charge transition
230
mS
11
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