LTC3521 Datasheet, PDF (5/20 Pages) Linear Technology – Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters

LTC3521
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
Switching Frequency vs V_IN
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
V_IN (V)
3521 G08
Buck-Boost Feedback Voltage
vs Temperature
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–40 –20
0 20 40 60 80
TEMPERATURE (°C)
100 120
3521 G09
Buck Feedback Voltage
vs Temperature
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3521 G10
Burst Mode Quiescent Current
vs V_IN
33
ALL THREE CONVERTERS ENABLED
31
29
27
25
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
V_IN (V)
3521 G11
Buck-Boost Maximum Load
Current, Burst Mode Operation
90
80
V_OUT = 3V
70
60
V_OUT = 5V
50
40
30
20
10
0
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
V_IN (V)
3521 G12
Buck-Boost Maximum Load
Current, PWM Mode
1500 ^{L = 4.7µH}
1300
1100
V_OUT = 3.3V
900
700
V_OUT = 5V
500
300
100
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
V_IN (V)
3521 G13
No Load Quiescent Current
vs V_IN
60
55
Buck-Boost Load Step,
0mA to 750mA
V_OUT
100mV/DIV
V_IN = 3.6V, V_OUT = 3.3V
L = 4.7µH
C_OUT = 22µF
50
45
40
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
V_IN (V)
3521 G14
INDUCTOR
CURRENT
500mA/DIV
100µs/DIV
3521 G15
3521f