Datasheet

LTC3569
5
3569fe
For more information www.linear.com/LTC3569
Efficiency vs V
SUPPLY
OUT1 = 1.8V
Efficiency vs V
SUPPLY
OUT2 = 1.2V
Efficiency vs V
SUPPLY
OUT3 = 1.5V
Typical perForMance characTerisTics
Oscillator Frequency
vs Temperature
R
DS(ON)
SW1
vs V
SUPPLY
and Temperature
R
DS(ON)
SW2 and SW3
vs V
SUPPLY
and Temperature
V
FB
vs Temperature I
SVIN
vs V
SUPPLY
Pulse-Skipping
I
SVIN
vs V
SUPPLY
Burst Mode Operation
V
SUPPLY
(V)
2
EFFICIENCY (%)
95
90
75
85
80
70
65
4
3569 G04
653
BUCK1 ONLY
I
LOAD
= 270mA
I
LOAD
= 220mA
I
LOAD
= 170mA
I
LOAD
= 120mA
V
SUPPLY
(V)
2
EFFICIENCY (%)
95
90
75
85
80
70
65
4
3569 G05
653
BUCK2 ONLY
I
LOAD
= 210mA
I
LOAD
= 170mA
I
LOAD
= 110mA
I
LOAD
= 70mA
V
SUPPLY
(V)
2
EFFICIENCY (%)
95
90
75
85
80
70
65
4
3569 G06
653
BUCK3 ONLY
I
LOAD
= 210mA
I
LOAD
= 170mA
I
LOAD
= 110mA
I
LOAD
= 70mA
TEMPERATURE (°C)
–50
f
CLK
(MHz)
2.40
2.30
2.10
2.20
2.00
50
3569 G07
1501000
V
IN
= 5.5V
V
IN
= 3.5V
V
IN
= 2.5V
V
RT
= SV
IN
V
SUPPLY
(V)
2
R
DS(ON)
(Ω)
0.35
0.30
0.20
0.25
0.15
0.10
4
3569 G08
653
NSW1
PSW1
100°C
25°C
–50°C
V
SUPPLY
(V)
2
R
DS(ON)
(Ω)
0.50
0.30
0.35
0.40
0.45
0.20
0.25
0.15
0.10
4
3569 G09
653
NSW2 & 3
PSW3 & 3
100°C
25°C
–50°C
TEMPERATURE (°C)
–50
V
FB
ERROR (%)
0.3
0.2
–0.2
–0.1
0.1
0.0
–0.3
50
3569 G10
1501000
V
REF
SET TO MAX
V
FB1
V
FB2
V
FB3
V
SUPPLY
(V)
2
I
SVIN
(µA)
700
400
500
600
200
300
100
0
4
3569 G11
653
ALL 3
2 BUCKS ENABLED
1 BUCK ENABLED
NO LOAD
V
SUPPLY
(V)
2
I
SVIN
(µA)
120
60
80
100
20
40
0
4
3569 G12
653
ALL 3
2 BUCKS ENABLED
1 BUCK ENABLED
NO LOAD
T
A
= 25°C, unless otherwise noted.