Datasheet

LTC3522
5
3522fa
Buck-Boost Feedback Voltage vs
Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
Buck Feedback Voltage vs
Temperature
Buck-Boost Maximum Load
Current, Burst Mode Operation
No Load Quiescent Current
vs V
IN
Buck-Boost Burst to PWM
Transition
Buck Load Step, PWM Mode,
5mA to 200mA
TEMPERATURE (°C)
–40
CHANGE IN FEEDBACK VOLTAGE FROM 20°C (%)
0.1
0.3
0.5
120
3522 G09
–0.1
–0.3
0
0.2
0.4
–0.2
–0.4
–0.5
0–20
4020
80 100 140
60
TEMPERATURE (°C)
–40
CHANGE IN FEEDBACK VOLTAGE FROM 20°C (%)
0.1
0.3
0.5
120
3522 G09
–0.1
–0.3
0
0.2
0.4
–0.2
–0.4
–0.5
0–20
4020
80 100 140
60
V
IN
(V)
2.4
0
MAXIMUM LOAD CURRENT (mA)
10
30
40
50
4.4
90
3522 G11
20
3.4
2.9
4.9 5.4
3.9
60
70
80
V
OUT
= 3V
V
OUT
= 5V
L = 4.7μH
Buck-Boost Maximum Load
Current, PWM Mode
V
IN
(V)
2.4
0
LOAD CURRENT (mA)
100
300
400
500
4.4
600
3522 G12
200
3.4
2.9
4.9 5.4
3.9
V
OUT
= 3.3V
L = 4.7μH
V
OUT
= 5V
V
IN
(V)
2.4
0
QUIESCENT CURRENT (μA)
5
15
20
25
50
35
3.4
4.4
4.9
3522 G13
10
40
45
30
2.9
3.9
5.4
BOTH CONVERTERS ENABLED
INDUCTOR
CURRENT
200mA/DIV
V
OUT
100mV/DIV
50μs/DIV
3522 G14
V
IN
= 3.6V
V
OUT
= 3.3V
L = 4.7μH
C
OUT
= 4.7μF
Buck-Boost Load Step,
0mA to 300mA
INDUCTOR
CURRENT
200mA/DIV
V
OUT
100mV/DIV
100μs/DIV
3522 G15
V
IN
= 3.6V
V
OUT
= 3V
L = 4.7μH
C
OUT
= 4.7μF
INDUCTOR
CURRENT
100mA/DIV
V
OUT
100mV/DIV
100μs/DIV
3522 G16
V
IN
= 3.6V
V
OUT
= 1.8V
L = 4.7μH
C
OUT
= 4.7μF
Buck Load Step, Burst Mode
Operation, 5mA to 200mA
INDUCTOR
CURRENT
100mA/DIV
V
OUT
100mV/DIV
100μs/DIV
3522 G17
V
IN
= 3.6V
V
OUT
= 1.8V
L = 4.7μH
C
OUT
= 4.7μF
(T
A
= 25°C unless otherwise noted)