LTC3552 Datasheet, PDF (5/24 Pages) Linear Technology – Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter

LTC3552
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C Unless Otherwise Specified.
Battery Charger
⎯C⎯H⎯R⎯G Pin I-V Curve
(Pull-Down State)
30
T_A = –40°C
25
T_A = 25°C
⎯_P⎯_W⎯_{R Pin I-V Curve}
(Pull-Down State)
30
T_A = –40°C
25
T_A = 25°C
Charge Current vs Battery Voltage
600
500
20
T_A = 90°C
20
T_A = 90°C
400
15
15
300
10
5
0
01
V_IN = 5V
V_BAT = 4V
2 34 5
V_CHRG (V)
67
3552 G07
10
5
0
01
V_IN = 5V
V_BAT = 4V
2 34 5
V_PWR (V)
67
3552 G08
200
100
0
2.4 2.7
V_IN = 5V
θ_JA = 40°C/W
R_PROG = 2k
3 3.3 3.6 3.9 4.2 4.5
V_BAT (V)
3552 G09
Trickle Charge Current
vs Temperature
60
V_IN = 5V
V_BAT = 2.5V
50
R_PROG = 2k
40
30
20
R_PROG = 10k
10
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3552 G09a
Trickle Charge Current vs V_IN
60
V_BAT = 2.5V
50
R_PROG = 2k
40
30
20
R_PROG = 10k
10
0
4 4.5 5 5.5 6
V_IN (V)
6.5 7
3552 G09b
Trickle Charge Threshold Voltage
vs Temperature
3.000
V_IN = 5V
2.975 ^RPROG ^{= 10k}
2.950
2.925
2.900
2.875
2.850
2.825
2.800
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
3552 G09c
Charge Current vs V_IN
600
R_PROG = 2k
500
400
V_BAT = 4V
300 ^{θJA = 40°C/W}
200
R_PROG = 10k
100
Charge Current
vs Ambient Temperature
600
ONSET OF THERMAL REGULATION
500
R_PROG = 2k
400
V_IN = 5V
300 V_BAT = 4V
θ_JA = 40°C/W
200
R_PROG = 10k
100
0
4 4.5 5 5.5 6 6.5 7 7.5 8
V_IN (V)
3552 G10
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3552 G11
3552f
5