LTC3559-1_15 Datasheet, PDF (7/24 Pages) Linear Technology – Linear USB Battery Charger with Dual Buck Regulators

LTC3559/LTC3559-1
TYPICAL PERFORMANCE CHARACTERISTICS
Buck Regulator Enable
Thresholds vs Temperature
1200 _{PVIN = 3.8V}
1100
1000
900
800
RISING
700
FALLING
600
500
400
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3559 G22
Buck Regulator Efficiency vs I_LOAD
(LTC3559)
100
Burst Mode
90 _OPERATION
80
70
PULSE SKIP
60
MODE
50
40
30
20
10
0
0.1
V_OUT = 2.5V
PV_IN = 4.2V
1
10
100
1000
I_LOAD (mA)
3559 G25
Buck Regulator Efficiency vs I_LOAD
(LTC3559)
100
90
Burst Mode
OPERATION
80
70
60
PULSE SKIP
50
MODE
40
30
20
10
0
0.1
V_OUT = 1.2V
PV_IN = 2.7V
PV_IN = 4.2V
1
10
100
1000
I_LOAD (mA)
3559 G28
Buck Regulator PMOS R_DS(0N)
vs Temperature (LTC3559)
1300
1200
1100
1000
900
PV_IN = 2.7V
800
PV_IN = 4.2V
700
600
500
400
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3559 G23
Buck Regulator Load Regulation
2.60
PV_IN = 3.8V
2.58 ^{VOUT = 2.5V}
2.56
2.54
Burst Mode
OPERATION
2.52
2.50
PULSE SKIP
2.48
MODE
2.46
2.44
1
10
100
I_LOAD (mA)
1000
3559 G26
Buck Regulator Load Regulation
1.25
PV_IN = 3.8V
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
3559 G29
Buck Regulator NMOS R_DS(0N)
vs Temperature (LTC3559)
1300
1200
1100
1000
900
PV_IN = 2.7V
800
PV_IN = 4.2V
700
600
500
400
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3559 G24
Buck Regulator Line Regulation
2.60 _{VOUT = 2.5V}
2.58 ^{ILOAD = 200mA}
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.7
3.0
3.3
3.6
3.9 4.2
PV_IN (V)
3559 G27
Buck Regulator Line Regulation
1.25
V_OUT = 1.2V
1.24 _{ILOAD = 200mA}
1.23
1.22
1.21
1.20
1.19
1.18
1.17
1.16
1.15
2.7 3.0 3.3 3.6 3.9 4.2
PV_IN (V)
3559 G30
3559fb
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