Datasheet

LTC3521
6
3521fb
For more information www.linear.com/LTC3521
Typical perForMance characTerisTics
Buck-Boost Current Limit
vs Temperature
Buck Current Limit
vs Temperature
T
A
= 25°C, unless otherwise noted.
Buck-Boost Peak Current Limit
vs Temperature
TEMPERATURE (°C)
CURRENT LIMIT (mA)
2100
2050
2000
1950
2150
3521 G19
–50
–25 250 50 75 100 125
TEMPERATURE (°C)
CURRENT LIMIT (mA)
3300
3250
3200
3350
3521 G20
–50
–25 250 50 75 100 125
TEMPERATURE (°C)
CURRENT LIMIT (mA)
1100
1050
1000
950
900
1150
3521 G21
–50
–25 250 50 75 100 125
50µs/DIV
V
OUT
20mV/DIV
INDUCTOR
CURRENT
200mA/DIV
3521 G16
V
IN
= 3.6V
V
OUT
= 3.3V
L
= 4.7µH
C
OUT
= 22µF
Buck-Boost Burst Mode Operation
to PWM Transition
Buck Load Step, PWM Mode,
10mA to 400mA
Buck Load Step, Burst Mode,
10mA to 400mA
100µs/DIV
V
OUT
100mV/DIV
INDUCTOR
CURRENT
200mA/DIV
3521 G17
V
IN
= 3.6V
V
OUT
= 1.8V
L
= 4.7µH
C
OUT
= 10µF
100µs/DIV
V
OUT
100mV/DIV
INDUCTOR
CURRENT
200mA/DIV
3521 G18
V
IN
= 3.6V
V
OUT
= 1.8V
L
= 4.7µH
C
OUT
= 10µF
No Load Quiescent Current
vs V
IN
100µs/DIV
V
OUT
100mV/DIV
INDUCTOR
CURRENT
500mA/DIV
3521 G15
V
IN
= 3.6V, V
OUT
= 3.3V
L
= 4.7µH
C
OUT
= 22µF
Buck-Boost Load Step,
0mA to 750mA
V
IN
(V)
1.8
QUIESCENT CURRENT (µA)
5.3
2.8 3.8
2.3
3.3 4.3 4.8
45
40
55
60
50
3521 G14