LTC3522_15 Datasheet, PDF (5/20 Pages) Linear Technology – Synchronous 400mA Buck-Boost and 200mA Buck Converters

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