LTC3558_15 Datasheet, PDF (8/32 Pages) Linear Technology – Linear USB Battery Charger with Buck and Buck-Boost Regulators

LTC3558
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Buck and Buck-Boost Regulator
Undervoltage Thresholds
vs Temperature
2.750
BAT = PV_IN1 = PV_IN2
2.700
2.650
2.600
2.550
RISING
2.500
FALLING
2.450
2.400
2.350
2.300
2.250
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3558 G19
Buck and Buck-Boost Regulator
Enable Thresholds
vs Temperature
1200
BAT = PV_IN1 = PV_IN2 = 3.6V
1100
1000
900
800
RISING
700
FALLING
600
500
400
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3558 G20
Buck Regulator Input Current vs
Temperature, Burst Mode Operation
50
FB1 = 0.85V
45
40
PV_IN1 = 4.2V
35
PV_IN1 = 2.7V
30
25
20
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3558 G21
Buck Regulator Input Current vs
Temperature, Pulse Skip Mode
400
FB1 = 0.85V
350
300
PV_IN1 = 4.2V
250
PV_IN1 = 2.7V
200
150
100
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3558 G22
Buck Regulator PMOS R_DS(0N)
vs Temperature
1300
1200
1100
1000
900
PV_IN1 = 2.7V
800
PV_IN1 = 4.2V
700
600
500
400
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3558 G23
Buck Regulator NMOS R_DS(0N)
vs Temperature
1300
1200
1100
1000
900
PV_IN1 = 2.7V
800
PV_IN1 = 4.2V
700
600
500
400
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3558 G24
Buck Regulator Efficiency vs I_LOAD
100
90
Burst Mode
OPERATION
80
70
60
50
PULSE SKIP
MODE
40
30
20
10
0
0.1
V_OUT = 1.2V
PV_IN1 = 2.7V
PV_IN1 = 4.2V
1
10
100
I_LOAD (mA)
1000
3558 G25
8
Buck Regulator Load Regulation
1.25
PV_IN1 = 3.6V
1.24 V_OUT = 1.2V
1.23
1.22
1.21
Burst Mode
OPERATION
1.20
PULSE SKIP
1.19
MODE
1.18
1.17
1.16
1.15
1
10
100
I_LOAD (mA)
1000
3558 G26
Buck Regulator Line Regulation
1.250
I_LOAD = 200mA
1.240
1.230
1.220
1.210
1.200
1.190
1.180
1.170
1.160
1.150
2.700
3.000
3.300 3.600
PV_IN1 (V)
3.900 4.200
3558 G27
3558f