Datasheet

LTC3589/LTC3589-1/
LTC3589-2
9
3589ff
For more information www.linear.com/3589
Typical perForMance characTerisTics
Standby I
VIN
vs V
IN
LDO2 to LDO4 I
VIN
vs V
IN
V
IN
= 3.8V, T
A
= 25°C, unless otherwise noted.
Step-Down Switching Regulator
I
VIN
vs V
IN
Input Supply Current
vs Temperature Buck-Boost I
VIN
vs V
IN
Step-Down Switching Regulator
I
VIN
vs V
IN
V
IN
(V)
2.5
I
VIN
(µA)
14
4.0
22554 G01
8
4
3.0 3.5 4.5
2
0
12
10
6
5.0 5.5
V
IN
(V)
2.5
I
VIN
(µA)
4.0
3589 G02
150
50
3.0 3.5 4.5
0
250
200
100
5.0 5.5
ENABLE TWO LDOs
ENABLE ONE LDO
ENABLE THREE LDOs
V
IN
(V)
2.5
I
VIN
(µA)
4.0
3589 G03
400
500
600
200
100
3.0 3.5 4.5
0
900
800
700
300
5.0 5.5
ENABLE TWO BUCKS
ENABLE ONE BUCK
ENABLE THREE BUCKS
PULSE-SKIPPING MODE
V
IN
(V)
2.5
I
VIN
(µA)
4.0
3589 G04
80
100
120
40
20
3.0 3.5 4.5
0
60
5.0 5.5
ENABLE TWO BUCKS
ENABLE ONE BUCK
ENABLE THREE BUCKS
Burst Mode OPERATION
TEMPERATURE (°C)
–50
I
VIN
(µA)
5025
3589 G05
800
1000
1200
400
200
–25 0 75
0
600
100 125 150
ALL REGULATORS ENABLED
Burst Mode OPERATION
STANDBY (ONLY LDO1 ON)
ALL REGULATORS ENABLED
PULSE-SKIPPING MODE
V
IN
(V)
2.5
I
VIN
(µA)
4.54.0
3589 G06
350
400
450
150
200
50
100
3.0 3.5 5.0
0
300
250
5.5
Burst Mode OPERATION
PWM MODE
Oscillator Frequency
vs Temperature Switching Frequency Change vs V
IN
Buck-Boost Efficiency vs I
OUT
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
70
3589 G07
2.20
2.25
2.30
2.10
2.15
2.00
2.05
–10 30 110
1.95
150
V
IN
(V)
2.5
PERCENT CHANGE (%)
4.0
3589 G08
0.6
0.8
1.0
–0.2
0
0.2
0.4
–0.6
–0.4
3.0 3.5 4.5
–0.8
5.55.0
LOAD CURRENT (mA)
0
EFFICIENCY (%)
50
40
30
60
70
100
0.01 0.1 1 10 100 1000
3589 G9
20
10
80
90
BURST
PWM MODE
V
OUT
= 5.0V
V
OUT
= 2.5V
V
OUT
= 3.3V
V
IN
= 3.8V