LM3647 Datasheet, PDF (4/17 Pages) National Semiconductor (TI) – Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries

3.0 Electrical Characteristics
Absolute Maximum Ratings
Supply Voltage (V_CC)
Voltage at Any Pin
Total Current into V_CC Pin (Source)
Total Current out of GND Pin (Sink)
Storage Temperature Range
7V
–0.3V to V_CC + 0.3V
100 mA
110 mA
–65˚C to +140˚C
Note: If Military/Aerospace specified devices are required
please contact the National Semiconductor Sales Office/Dis-
tributors for availability and specifications.
Note: Absolute maximum ratings indicate limits beyond
which damage to the device may occur. DC and AC electrical
specifications are not ensured when operating the device at
absolute maximum ratings.
DC Electrical Characteristics: -40˚C ≤ T_A ≤ +85˚C unless otherwise specified
Parameter
Conditions
Min
Operating Voltage
4.5
Supply Current
LED-pin Sink Current
7.5
Temperature Input Levels
Ni-Cd / Ni-MH Upper limit
(Voltage at TEMP-pin)
Li-Ion Upper limit
(Voltage at TEMP-pin)
Lower Limit
(Voltage at TEMP-pin)
Start limit
(Voltage at TEMP-pin)
Li-Ion (for both 4.1 and 4.2V Cells)
Maintenance Charge Minimum Voltage
(CEL pin)
Maintenance Charge Restart Voltage
(CEL pin)
Good Battery Threshold
(CEL pin)
Maintenance Current
(Voltage at CS-pin)
Maintenance Current Lower Threshold
(Voltage at CS-pin)
Minimum Current Fast Charge Termination
(Voltage at CS-pin)
Qualification Current
(Voltage at CS-pin)
Maximum Charging Current
(Voltage at CS-pin)
Ni-Cd/Ni-MH
Maximum Battery Voltage
(CEL pin)
Maximum Battery Current
(Voltage at CS-pin)
Battery Presence Limit
(CEL pin)
Discharged Battery Limit
(CEL pin)
Good Battery Threshold
(CEL pin)
Typ Max Units
5.5
V
2.5
mA
15
mA
3.15
V
3.0
V
0.5
V
2.2
V
2.6
V
2.153
V
1.2
V
2.3
V
2.42
V
2.3
V
2.3
V
1.5
V
3.017
V
1.5
V
1.0
V
1.7
V
1.2
V
Soft Start Current
Topping Charge Current
Maintenance Charge Current
V_REF
AC Electrical Characteristics
(Voltage at CS-pin)
(Voltage at CS-pin)
(Voltage at CS-pin)
Parameter
RCIN frequency
Fast-PWM frequency
Slow-PWM frequency
Conditions
R = 3.3kΩ, C = 68pF
2.3
V
2.3
V
2.425 2.45
V
2.5
V
Min
Typ
2.5
250
0.1
Max
Units
MHz
Hz
Hz
4
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