LTC3559-1_15 Datasheet, PDF (6/24 Pages) Linear Technology – Linear USB Battery Charger with Dual Buck Regulators

LTC3559/LTC3559-1
TYPICAL PERFORMANCE CHARACTERISTICS
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
3559 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
3559 G16
Buck Regulator Input Current vs
Temperature, Pulse Skip Mode
(LTC3559)
400
V_FB = 0.82V
350
300
PV_IN = 4.2V
250
PV_IN = 2.7V
200
150
100
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3559 G19
6
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)
3559 G14
Complete Charge Cycle
2400mAh Battery (LTC3559)
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)
3559 G17
Buck Regulator PV_IN Undervoltage
Thresholds vs Temperature
2.85
2.75
2.65
RISING
2.55
FALLING
2.45
2.35
2.25
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3559 G20
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)
3559 G15
Buck Regulator Input Current vs
Temperature, Burst Mode Operation
50
V_FB = 0.82V
45
40
PV_IN = 4.2V
35
PV_IN = 2.7V
30
25
20
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3559 G18
Frequency vs Temperature
2.5
PV_IN = 3.8V
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3559 G21
3559fb