LTC3589_12 Datasheet, PDF (10/50 Pages) Linear Technology – 8-Output Regulator with Sequencing and I2C

LTC3589/LTC3589-1/
LTC3589-2
TYPICAL PERFORMANCE CHARACTERISTICS V_IN = 3.8V, T_A = 25°C, unless otherwise noted.
Buck-Boost Efficiency vs I_OUT
100
V_OUT = 3.3V
90
BURST
80
70
60
PWM MODE
50
40
30
20
10
0
0.01
V_IN = 5.0V
V_IN = 4.2V
V_IN = 3.0V
0.1
1
10 100 1000
LOAD CURRENT (mA)
3589 G10
Step-Down Switching Regulator 3
Efficiency vs I_OUT
100
V_OUT = 3.3V
90
80
BURST
70
60
PULSE-
SKIPPING
50
40
30
FORCED
CONTINUOUS
20
10
0
0.01
0.1
1
10 100
LOAD CURRENT (mA)
1000
3589 G13
Step-Down Switching
Regulator Current Limit
vs Temperature
3.5
BUCK1
3.0
2.5
BUCK2, BUCK3
(LTC3589-1/LTC3589-2)
2.0
BUCK2, BUCK3
1.5
1.0
0.5
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3589 G16
10
Step-Down Switching Regulator 1
Efficiency vs I_OUT
100
V_OUT = 1.2V
90
80
BURST
70
60
50
40
FORCED
CONTINUOUS
30
20
PULSE-SKIPPING
10
0
0.01
0.1 1
10 100
LOAD CURRENT (mA)
1000
3589 G11
Step-Down Switching Regulator
R_DS(ON) vs Temperature
0.40
0.35
0.30
BUCK2, 3 PMOS
0.25
BUCK1 PMOS
0.20
BUCK2, 3 NMOS
0.15
0.10
BUCK1 NMOS
0.05
0
–50 –10 30
70 110 150
TEMPERATURE (°C)
3589 G14
Step-Down Switching Regulator 2
Efficiency vs I_OUT
100
V_OUT = 1.8V
90
BURST
80
70
60
50
40
FORCED
CONTINUOUS
30
20
10
PULSE-SKIPPING
0
0.01
0.1
1
10 100
LOAD CURRENT (mA)
1000
3589 G12
Buck-Boost R_DS(ON) vs Temperature
0.25
0.20
PMOS
0.15
NMOS
0.10
0.05
0
–50 –10 30
70
110 150
TEMPERATURE (°C)
3589 G15
Buck-Boost Current Limit
vs Temperature
3.5
3.0
PEAK LIMIT
Step-Down Switching Regulator
Soft-Start
V_OUT
2.5
CLAMP LIMIT
500mV/DIV
2.0
I_L
200mA/DIV
1.5
1.0
0.5
200μs/DIV
3589 G18
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3589 G17
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