LP3945 Datasheet, PDF (4/15 Pages) National Semiconductor (TI) – Battery Charge Management System

Absolute Maximum Ratings (Notes 1,
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
CHG-IN
BATT, VB_SENSE, SDA, SCL, EOC,
CHG, EN, BIPB, StopModeEN
Junction Temperature
Storage Temperature
Power Dissipation (Note 3)
−0.3V to +6.5V
−0.3V to +6V
150˚C
−65˚C to +150˚C
1.76W
ESD (Note 4)
Human Body Model
Machine Model
2kV
200V
Operating Ratings (Notes 1, 2)
CHG-IN
EN, BIPB, StopModeEN
Junction Temperature, T_J
Operating Temperature, T_A
Thermal Resistance, θ_JA
Maximum Power Dissipation
(T_A = 85˚C, (Note 5) )
3.0V to 6.0V
0V to (V_CHG-IN+0.3V)
−40˚C to +125˚C
−40˚C to +85˚C
37˚C/W
1.08W
Electrical Characteristics
Unless otherwise noted, V_CHG-IN = 5V, V_BATT = 4V, C_CHG-IN = 1µF, C_BATT = 10µF. Typical values and limits appearing in nor-
mal type apply for T_J = 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for operation,
T_J = −40˚C to +85˚C. (Notes 6, 7, 8)
Symbol
Parameter
Conditions
Typical
Limit
Min
Max
Units
V_CC SUPPLY
V_CHG-IN
Input Voltage Range
Operating Range
Battery Connected
4.5
6
V
4.5
6
V_CHG-IN ≤ 4V
2
20
µA
I_BATT
Battery Leakage Current
EOC = Low, adaptor connected,
50
V_BATT = 4.1V
V_OK−TSHD
Adapter OK Trip Point (CHG-IN) ^{VCHG-IN - VBATT (Rising)}
V_CHG-IN - V_BATT (Falling)
60
50
150
µA
mV
mV
Under Voltage Lock-out Trip
V_{UVLO−TSHD Point}
V_CHG-IN (Rising)
V_CHG-IN (Falling)
4.15
3.8
4.5
V
3.95
3.6
4.3
V
V_{OVLO−TSHD}
Over Voltage Lock-out Trip Point ^{VCHG-IN (Rising)}
V_CHG-IN (Falling)
5.9
5.7
V
Thermal Shutdown Temperature
160
˚C
(Note 7)
Thermal Shutdown Hysteresis
20
˚C
BATTERY CHARGER — Li ION MODE (MODE = LOW)
Fast Charge Current Range
500
950
mA
I_CHG
Fast Charge Current Accuracy
Programmable Charging Current
Step
−10
+10
%
50
mA
I_PRE-CHG
Pre-Charge Current
V_BATT = 2V
50
65
mA
I_EOC
End Of Charge Current Accuracy For I_EOC = 0.1C, 0.15C or 0.2C
+20
−20
%
Battery Regulation Voltage
T_J = 0˚C to +85˚C
4.1
4.059
4.141
I_CHARGE = 10 mA, Mode = Low
V_BATT
(For 4.1V Cell) (Default State) T_J = −40˚C to +85˚C
4.1
4.038
4.162
I_CHARGE = 10 mA, Mode = Low
V
T_J = 0˚C to +85˚C
4.2
4.158
4.242
Battery Regulation Voltage
I_CHARGE = 10 mA, Mode = Low
(For 4.2V Cell)
T_J = −40˚C to +85˚C
4.2
4.137
4.263
I_CHARGE = 10 mA, Mode = Low
V_CHG-Q
Full Charge Qualification
Threshold
V_BATT Rising, Transition from
3.0
Pre-Charge to Full Current
V
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