Datasheet

LTC3589/LTC3589-1/
LTC3589-2
11
3589ff
For more information www.linear.com/3589
Typical perForMance characTerisTics
Buck-Boost Switching Regulator
Soft-Start Dynamic Voltage Slew
Step-Down Switching Regulator 1
Load Step
Buck-Boost Switching Regulator 1
Load Step
Maximum Buck-Boost Load
Current vs V
IN
Step-Down Switching Regulator 1
Load Step
3589 G19
100µs/DIV
1V/DIV
500mA/DIV
V
OUT
I
L
3589 G20
200µs/DIV
1V/DIV
5V/DIV
5V/DIV
V
OUT
V
STB
PGOOD
V
RRCR
= 1.75mV/µs
3589 G21
40µs/DIV
V
OUT
I
LOAD
LOAD CAPACITANCE = 44µF
50mV/DIV
1A/DIV
PULSE-SKIPPING MODE
3589 G22
40µs/DIV
V
OUT
I
LOAD
LOAD CAPACITANCE = 44µF
50mV/DIV
1A/DIV
Burst Mode OPERATION
V
IN
(V)
2.5
LOAD CURRENT (A)
4.0
3589 G24
1.5
0.5
3.0 3.5 4.5
0
2.5
2.0
1.0
5.0 5.5
V
OUT
= 1.8V
V
OUT
= 3.3V
V
OUT
= 5V
3589 G23
40µs/DIV
V
OUT
I
LOAD
200mV/DIV
1A/DIV
LOAD CAPACITANCE = 22µF
V
IN
= 3.8V, T
A
= 25°C, unless otherwise noted.
LDO1 Dropout Voltage
vs Temperature
LDO1 Output Change vs V
IN
LDO1 Short-Circuit Current
vs Temperature
TEMPERATURE (°C)
–50
SHORT-CIRCUIT CURRENT (mA)
75 100
3589 G27
60
70
80
30
50
40
–25 0 25 50
20
150125
V
IN
(V)
2
CHANGE IN V
LDO1
(%)
3589 G26
0.0
0.5
–1.5
–0.5
–1.0
3 4
–2.0
5
V
LDO1
= 25mA
V
LDO1
= 1.2V
V
LDO1
= 1.8V
V
LDO1
= 2.8V
V
LDO1
= 3.3V
TEMPERATURE (°C)
–50
DROPOUT VOLTAGE (mV)
75 100
3589 G25
400
500
100
300
200
–25 0 25 50
0
150125
V
LDO1
= 1.8V
V
LDO1
= 3.3V