Datasheet

LTC3589/LTC3589-1/
LTC3589-2
10
3589ff
For more information www.linear.com/3589
Typical perForMance characTerisTics
Buck-Boost Efficiency vs I
OUT
Step-Down Switching Regulator 1
Efficiency vs I
OUT
Step-Down Switching Regulator 2
Efficiency vs I
OUT
Step-Down Switching Regulator 3
Efficiency vs I
OUT
Buck-Boost R
DS(ON)
vs Temperature
Step-Down Switching Regulator
R
DS(ON)
vs Temperature
LOAD CURRENT (mA)
0
EFFICIENCY (%)
50
40
30
60
70
100
0.01 0.1 1 10 100 1000
3589 G10
20
10
80
90
BURST
PWM MODE
V
IN
= 5.0V
V
IN
= 4.2V
V
IN
= 3.0V
V
OUT
= 3.3V
LOAD CURRENT (mA)
0
EFFICIENCY (%)
50
40
30
60
70
100
0.01 0.1 1 10 100 1000
3589 G12
20
10
80
90
FORCED
CONTINUOUS
PULSE-SKIPPING
BURST
V
OUT
= 1.8V
LOAD CURRENT (mA)
0
EFFICIENCY (%)
50
40
30
60
70
100
0.01 0.1 1 10 100 1000
3589 G13
20
10
80
90
FORCED
CONTINUOUS
PULSE-
SKIPPING
BURST
V
OUT
= 3.3V
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
70
3589 G14
0.35
0.40
0.15
0.20
0.25
0.30
0.05
0.10
–10 30
0
150110
BUCK2, 3 PMOS
BUCK1 PMOS
BUCK2, 3 NMOS
BUCK1 NMOS
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
70
3589 G15
0.15
0.20
0.25
0.05
0.10
–10 30
0
150110
PMOS
NMOS
LOAD CURRENT (mA)
0
EFFICIENCY (%)
50
40
30
60
70
100
0.01 0.1 1 10 100 1000
3589 G11
20
10
80
90
PULSE-SKIPPING
FORCED
CONTINUOUS
V
OUT
= 1.2V
BURST
V
IN
= 3.8V, T
A
= 25°C, unless otherwise noted.
Step-Down Switching
Regulator Current Limit
vs Temperature
Step-Down Switching Regulator
Soft-Start
Buck-Boost Current Limit
vs Temperature
TEMPERATURE (°C)
–50
CURRENT LIMIT (A)
75 100
3589 G17
2.5
3.0
3.5
0.5
2.0
1.5
1.0
–25 0 25 50
0
150125
PEAK LIMIT
CLAMP LIMIT
3589 G18
200µs/DIV
500mV/DIV
200mA/DIV
V
OUT
I
L
TEMPERATURE (°C)
–50
CURRENT LIMIT (A)
75 100
3589 G16
2.5
3.0
3.5
0.5
2.0
1.5
1.0
–25 0 25 50
0
150125
BUCK1
BUCK2, BUCK3
BUCK2, BUCK3
(LTC3589-1/LTC3589-2)