Datasheet

LTC3559/LTC3559-1
7
3559fb
I
LOAD
(mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3559 G28
0
1
PV
IN
= 2.7V
PV
IN
= 4.2V
V
OUT
= 1.2V
Burst Mode
OPERATION
PULSE SKIP
MODE
I
LOAD
(mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3559 G25
0
1
Burst Mode
OPERATION
PULSE SKIP
MODE
V
OUT
= 2.5V
PV
IN
= 4.2V
Buck Regulator Enable
Thresholds vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
Buck Regulator Effi ciency vs I
LOAD
(LTC3559) Buck Regulator Load Regulation
Buck Regulator Effi ciency vs I
LOAD
(LTC3559)
Buck Regulator Load Regulation
Buck Regulator PMOS R
DS(0N)
vs Temperature (LTC3559)
TEMPERATURE (°C)
–55
V
EN
(mV)
800
900
1000
105
3559 G22
700
600
400
–15
25
65
–35 125
5
45
85
500
1200
1100
PV
IN
= 3.8V
FALLING
RISING
TEMPERATURE (°C)
–55
400
R
DS(ON)
(mΩ)
500
700
800
900
65
1300
3559 G23
600
5
–35
85
25
–15
105
45 12
5
1000
1100
1200
PV
IN
= 2.7V
PV
IN
= 4.2V
Buck Regulator NMOS R
DS(0N)
vs Temperature (LTC3559)
TEMPERATURE (°C)
–55
400
R
DS(ON)
(mΩ)
500
700
800
900
65
1300
3559 G24
600
5
–35
85
25
–15
105
45 12
5
1000
1100
1200
PV
IN
= 2.7V
PV
IN
= 4.2V
I
LOAD
(mA)
1
2.52
V
OUT
(V)
2.56
2.60
10 100 100
0
3559 G26
2.48
2.50
2.54
2.58
2.46
2.44
Burst Mode
OPERATION
PULSE SKIP
MODE
PV
IN
= 3.8V
V
OUT
= 2.5V
PV
IN
(V)
2.7
V
OUT
(V)
2.50
2.52
2.54
3.6
4.2
3559 G27
2.48
2.46
2.44
3.0 3.3 3.9
2.56
2.58
2.60
V
OUT
= 2.5V
I
LOAD
= 200mA
Buck Regulator Line Regulation
I
LOAD
(mA)
1
1.19
V
OUT
(V)
1.20
1.21
1.22
1.23
10 100 100
0
3559 G29
1.18
1.17
1.16
1.15
1.24
1.25
PV
IN
= 3.8V
V
OUT
= 1.2V
Burst Mode
OPERATION
PULSE SKIP
MODE
PV
IN
(V)
2.7
V
OUT
(V)
1.21
1.23
1.25
3.9
3559 G30
1.19
1.17
1.20
1.22
1.24
1.18
1.16
1.15
3.0
3.3
3.6
4.2
V
OUT
= 1.2V
I
LOAD
= 200mA
Buck Regulator Line Regulation