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LTC4052-4.2_15 Datasheet, PDF (3/12 Pages) Linear Technology – Lithium-Ion Battery Pulse Charger with Overcurrent Protection
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LTC4052-4.2
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Absolute Maximum Rating for GATE pin applies only to externally
applied voltage. During normal operation the LTC4052-4.2’s internal
charge pump can generate GATE pin voltage exceeding absolute
maximum but it is internally current limited.
Note 3: The LTC4052EMS8E-4.2 is guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the – 40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 4: Junction temperature TJ is calculated from the ambient
temperature TA and power dissipation PD according to the following
formula: TJ = TA + (PD • θJA°C/W)
Note 5. This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
TYPICAL PERFOR A CE CHARACTERISTICS
Trickle Charge Threshold Voltage
vs Temperature
2.47
2.46
2.45
2.44
2.43
2.42
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4052 G01
Normalized Timer Duration
vs Temperature
103
CTIMER= 0.1µF
102
101
100
99
98
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4052 G04
Trickle Charge Current
vs Temperature
24.2
24.0
23.8
23.6
23.4
23.2
23.0
22.8
22.6
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4052 G02
Battery Float Voltage
vs Temperature
4.205
4.200
4.195
4.190
4.185
4.180
4.175
4.170
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4052 G05
Trickle Charge Current vs Input
Supply Voltage
35
VBAT = 2V
TA = 25°C
30
25
20
15
5
6
7
8
9
10
VIN (V)
4052 G03
CHRG Pin C/10 Pulldown Current
vs Temperature
55
50
45
40
35
30
25
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4052 G06
405242f
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