LTC3589-2_15 Datasheet, PDF (9/50 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.
Standby I_VIN vs V_IN
14
12
10
8
6
4
2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3589 G01
Step-Down Switching Regulator
I_VIN vs V_IN
120
Burst Mode OPERATION
100
ENABLE THREE BUCKS
80
ENABLE TWO BUCKS
60
ENABLE ONE BUCK
40
20
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3589 G04
Oscillator Frequency
vs Temperature
2.30
2.25
2.20
2.15
2.10
2.05
2.00
1.95
–50
–10
30
70
110 150
TEMPERATURE (°C)
3589 G07
LDO2 to LDO4 I_VIN vs V_IN
250
ENABLE THREE LDOs
200
ENABLE TWO LDOs
150
100
ENABLE ONE LDO
50
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3589 G02
Input Supply Current
vs Temperature
1200
1000
800
ALL REGULATORS ENABLED
PULSE-SKIPPING MODE
600
ALL REGULATORS ENABLED
400
Burst Mode OPERATION
200
0
–50 –25
STANDBY (ONLY LDO1 ON)
0 25 50 75 100 125 150
TEMPERATURE (°C)
3589 G05
Switching Frequency Change vs V_IN
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3589 G08
For more information www.linear.com/LTC3589
Step-Down Switching Regulator
I_VIN vs V_IN
900
PULSE-SKIPPING MODE
800
700 ENABLE THREE BUCKS
600
ENABLE TWO BUCKS
500
400
300
ENABLE ONE BUCK
200
100
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3589 G03
Buck-Boost I_VIN vs V_IN
450
400
350
PWM MODE
300
250
200
150
100
Burst Mode OPERATION
50
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3589 G06
Buck-Boost Efficiency vs I_OUT
100
V_IN = 3.8V
90
BURST
80
70
60
50
PWM MODE
40
30
20
10
0
0.01
V_OUT = 5.0V
V_OUT = 2.5V
V_OUT = 3.3V
0.1
1
10 100 1000
LOAD CURRENT (mA)
3589 G9
3589fg
9