LTC4057 Datasheet, PDF (4/12 Pages) Linear Technology – Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT

LTC4057- 4.2
TYPICAL PERFOR A CE CHARACTERISTICS
SHDN Threshold Voltage vs
Temperature and Supply Voltage
1.0
0.9
Trickle Charge Current vs
Temperature
60
R_PROG = 2k
50
Trickle Charge Current vs Supply
Voltage
60
R_PROG = 2k
50
0.8
V_CC = 6.5V
0.7
V_CC = 4.2V
0.6
0.5
40
40
30
V_CC = 5V
30
V_BAT = 2.5V
V_BAT = 2.5V
T_A = 25°C
20
20
R_PROG = 10k
10
R_PROG = 10k
10
0.4
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4057 G07
Trickle Charge Threshold vs
Temperature
3.000
V_CC = 5V
2.975 ^RPROG ^{= 10k}
2.950
2.925
2.900
2.875
2.850
2.825
2.800
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4057 G10
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4057 G08
Charge Current vs Battery Voltage
600
T_A = 0°C
500
400
T_A = 40°C
T_A = 25°C
300
200
100
V_CC = 5V
θ_JA = 125°C/W
R_PROG = 2k
0
2.7 3.0 3.3 3.6 3.9 4.2 4.5
V_BAT (V)
4057 G11
0
4.0 4.5 5.0 5.5 6.0
V_CC (V)
6.5 7.0
4057 G09
Charge Current vs Supply Voltage
600
R_PROG = 2k
500
400
V_BAT = 4V
300
T_A = 25°C
θ_JA = 125°C/W
200
R_PROG = 10k
100
0
4.0 4.5 5.0 5.5 6.0
V_CC (V)
6.5 7.0
4057 G12
Charge Current vs Ambient
Temperature
600
R_PROG = 2k
500
400
V_CC = 5V
300 V_BAT = 4V
θ_JA = 80°C/W
ONSET OF
THERMAL
REGULATION
200
R_PROG = 10k
100
Power FET “ON” Resistance vs
Temperature
700
V_CC = 4.2V
V_BAT = 4V
650 _{RPROG = 2k}
600
550
500
450
4
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
4057 G13
400
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4057 G14
4057f