LTC3558_15 Datasheet, PDF (7/32 Pages) Linear Technology – Linear USB Battery Charger with Buck and Buck-Boost Regulators

LTC3558
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Recharge Threshold
vs Temperature
115
111 ^{VCC = 5V}
107
103
99
95
91
87
83
79
75
–55 –35 –15 5 25 45
TEMPERATURE (°C)
65 85
3558 G10
CHRG Pin Output Low Voltage
vs Temperature
140
V_CC = 5V
120 ^{ICHRG = 5mA}
100
80
60
40
20
0
–55 –35
–15 5 25 45
TEMPERATURE (°C)
65 85
3558 G13
Timer Accuracy vs Temperature
7
V_CC = 5V
6
5
4
3
2
1
0
–1
–2
–55 –35 –15 5 25 45
TEMPERATURE (°C)
65 85
3558 G16
Battery Charger FET
On-Resistance vs Temperature
700
V_CC = 4V
650 ^{IBAT = 200mA}
EN1 = EN2 = 0V
600
550
500
450
400
350
300
–55 –35 –15 5 25 45
TEMPERATURE (°C)
65 85
3558 G11
SUSP/HPWR Pin Rising
Thresholds vs Temperature
1.2
V_CC = 5V
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
–55 –35
–15 5 25 45
TEMPERATURE (°C)
65 85
3558 G12
CHRG Pin I-V Curve
70
V_CC = 5V
BAT = 3.8V
60
50
40
30
20
10
0
0
1
2
3
4
5
6
CHRG (V)
3558 G14
Complete Charge Cycle
2400mAh Battery
1000
800
600
400
V_CC = 5V
R_PROG = 0.845k
HPWR = 5V
200
0
5.0
4.5
4.0
3.5
3.0
5.0
4.0
3.0
2.0
1.0
0
0
1
23
4
56
TIME (HOUR)
3558 G17
Timer Accuracy vs Supply Voltage
2.0
1.5
1.0
0.5
0
–0.5
–1.0
4.3 4.5 4.7 4.9 5.1 5.3 5.5
V_CC (V)
3558 G15
Buck and Buck-Boost Regulator
Switching Frequency vs Temperature
2.425
V_CC = 0V, MODE = 0
2.325 ^{BAT = PVIN1 = PVIN2}
2.225
BAT = 2.7V
2.125
BAT = 4.2V
BAT = 3.6V
2.025
1.925
1.825
1.725
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3558 G18
3558f
7