ltc3521fe Linear Technology Corporation, ltc3521fe Datasheet - Page 5

• Manufacturer Part Number: ltc3521fe
• Description: Ltc3521 Wide Vin, 1a Buck-boost Dc/dc And Dual 600ma Buck Dc/dc Converters Features
• Manufacturer: Linear Technology Corporation

Typical perForMance characTerisTics
–0.5
–1.0
–1.5
–2.0
1.0
0.5
2.0
1.5
31
33
29
27
25
0
1.8
1.8
Switching Frequency vs V
Burst Mode Quiescent Current
vs V
ALL THREE CONVERTERS ENABLED
2.3
2.3
IN
2.8
2.8
3.3
3.3
V
V
IN
IN
3.8
3.8
(V)
(V)
60
55
50
45
40
1.8
No Load Quiescent Current
vs V
4.3
4.3
2.3
IN
IN
4.8
4.8
2.8
3521 G08
3521 G11
5.3
5.3
3.3
V
IN
3.8
(V)
–0.5
–0.1
–0.2
–0.3
–0.4
0.2
0.1
4.3
90
80
70
60
50
40
30
20
10
0
0
–40
1.8
Buck-Boost Feedback Voltage
vs Temperature
Buck-Boost Maximum Load
Current, Burst Mode Operation
4.8
–20
2.3
3521 G14
5.3
0
2.8
TEMPERATURE (°C)
20
V
V
3.3
OUT
OUT
V
40
IN
= 3V
= 5V
3.8
(V)
60
100mV/DIV
500mA/DIV
INDUCTOR
4.3
CURRENT
80
V
4.8
OUT
100
T
3521 G12
3521 G09
Buck-Boost Load Step,
0mA to 750mA
A
V
L = 4.7µH
C
5.3
120
IN
OUT
= 25°C, unless otherwise noted.
= 3.6V, V
= 22µF
OUT
1500
1300
1100
–0.1
–0.2
–0.3
–0.4
–0.5
900
700
500
300
100
0.2
0.1
= 3.3V
100µs/DIV
0
–50
1.8
Buck-Boost Maximum Load
Current, PWM Mode
Buck Feedback Voltage
vs Temperature
L = 4.7µH
–25
2.3
V
OUT
2.8
0
TEMPERATURE (°C)
= 3.3V
V
OUT
3.3
25
V
3521 G15
IN
= 5V
LTC3521
(V)
3.8
50
4.3
75
4.8
100
3521 G13
5.3

3521 G10
3521f
125