LP3941A Datasheet, PDF (14/32 Pages) National Semiconductor (TI) – Cellular Phone Power Management Unit

Main Battery Charger Electrical Characteristics (Continued)
Unless otherwise noted, V_CHG-IN = 5V, V_BATT = 4V. 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, −40 to +125˚C. (Notes 2, 9,
8, 12)
Symbol
I_CHG
Parameter
Fast Charge Current Accuracy
Fast Charge Current Range
Condition
I_CHG = 700 mA
Min
Typ
Max
Units
−10
±5
+10
%
478
937
mA
Programmable Charging
Current Step
43
mA
I_PRE−CHG
R_SENSE
Pre-Charge Current
Internal Current Sense
Resistance
V_BATT = 2V
28
42
59
mA
120
mΩ
Internal Current Sense Resistor
Load Current
1.2
A
CHARGING PERFORMANCE
V_BATT
Battery Regulation Voltage
(CV Mode, for 4.1V Cell)
T_A −40˚C to +85˚C
4.015
4.1
4.19
Battery Regulation Voltage
CV mode, for 4.2V Cell)
T_A −40˚C to +85˚C
4.115
4.2
4.289
V_CHG-Q
Full Charge Qualification
Threshold
V_BATT Rising, Transition from
Pre-Charge to Full Current
2.8
3.0
3.2
V
V_BAT-RST Restart Threshold Voltage
V_BATT Falling, Transition from EOC,
3.9
(For 4.1V Cell)
to Pre-Qual State
V
Restart Threshold Voltage
V_BATT Falling, Transition from EOC,
4.0
(For 4.2 Cell)
to Pre-Qual State
t_EOC
Time to EOC State
A/D CONVERTER PERFORMANCE
−40˚C to +85˚C (Note 10)
4.80
5.625
6.55
Hrs
Resolution
8
Bits
INL
Relative Accuracy
−1
+1
LSB
DNL
Differential Nonlinearity
No Missing Code
−1
+1
LSB
Note: While charging a Li-Ion battery with this charger is possible in cold temperatures (generally below −5˚C–0˚C) is possible with the LP3941A, charging a battery
outside its manufacturer recommended temperature limits is strongly discouraged.
I²C Compatible Interface Electrical Characteristics
Unless otherwise noted, V_BATT = +2.5V to 5.5V. 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, −40 to +125˚C. (Notes 2, 8, 9)
Symbol
Parameter
Condition
Min
Typ
Max
Units
F_CLK
Clock Frequency
t_BF
Bus-Free Time between START and
(Note 10)
1.3
STOP
400
kHz
µs
t_HOLD
Hold Time Repeated START Condition
(Note 10)
0.6
µs
t_CLK-LP
CLK Low Period
(Note 10)
1.3
µs
t_CLK-HP
CLK High Period
(Note 10)
0.6
µs
t_SU
Set-Up Time Repeated START Condition (Note 10)
0.6
µs
t_DATA-HOLD
Data Hold Time
(Note 10)
0
µs
t_DATA-SU
Data Set-Up Time
(Note 10)
100
ns
t_SU
Set-Up Time for STOP Condition
(Note 10)
0.6
µs
t_TRANS
Maximum Pulse Width of Spikes that must (Note 10)
be suppressed by the input filter of both
50
ns
DATA & CLK signals.
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device
is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics tables.
Note 2: All voltages are with respect to the potential at the GND pin.
Note 3: The amount of Absolute Maximum power dissipation allowed for the device depends on the ambient temperature and can be calculated using the formula
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