LTC3558_15 Datasheet, PDF (10/32 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-Boost Regulator
Efficiency vs Input Voltage
100
95 ^{VOUT = 3.3V ILOAD = 10mA} _{ILOAD = 1mA}
90
85
80
75
I_LOAD = 100mA
70 ILOAD = 400mA
65
60
55
50
2.700
3.000
Burst Mode
OPERATION
PWM MODE
3.300 3.600
PV_IN2 (V)
3.900 4.200
3558 G37
Buck-Boost Regulator
Load Regulation
3.36
3.35 ^{PVIN2 = 3.6V}
3.34
3.33
3.32 Burst Mode OPERATION
3.31
3.30
3.29
3.28
3.27
3.26
3.25
3.24
0.10
1
10
I_LOAD (mA)
PWM MODE
100
1000
3558 G39
Buck-Boost Efficiency
vs Load Current
100
V_OUT = 3.3V
90 _3.6V
80 ^4.2V _2.7V
70
60
50
40
30
2.7V
20
10
0
0.10
3.6V
4.2V
1
PV_IN2, Burst Mode
OPERATION
PV_IN2, PWM MODE
10
I_LOAD (mA)
100
1000
3558 G38
Buck-Boost Regulator
Line Regulation
3.36
3.35
3.34
3.33
3.32
3.31 ^{PWM MODE}
3.30 ^{ILOAD = 100mA}
3.29
Burst Mode
3.28
OPERATION
3.27
I_LOAD = 10mA
3.26
3.25
3.24
2.700 3.000 3.300 3.600 3.900 4.200
PV_IN2 (V)
3558 G40
Buck-Boost Regulator Start-Up
Transient, Burst Mode Operation
PV_IN2 = 3.6V
R_LOAD = 332Ω
V_OUT
1V/DIV
INDUCTOR
CURRENT
I_L = 200mA/DIV
EN2
1V/DIV
100μs/DIV
3558 G41
Buck-Boost Regulator Start-Up
Transient, PWM Mode
PV_IN2 = 3.6V
R_LOAD = 16Ω
V_OUT
1V/DIV
INDUCTOR
CURRENT
I_L = 200mA/DIV
EN2
1V/DIV
100μs/DIV
3558 G42
3558f
10