LTC3520 Linear Technology, LTC3520 Datasheet - Page 7

• Manufacturer Part Number: LTC3520
• Description: Synchronous 1A Buck-Boost and 600mA Buck Converters
• Manufacturer: Linear Technology

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TYPICAL PERFORMANCE CHARACTERISTICS
200mA/DIV
INDUCTOR
50mV/DIV
CURRENT
1800
1600
1400
1200
1000
V
800
600
400
200
100
OUT
95
90
85
80
75
70
0
0.4
2.2
Buck-Boost
Burst Mode Operation
Buck-Boost Maximum
Output Current, PWM Mode
C
L = 4.7µH
Buck-Boost PWM Mode
Effi ciency vs Frequency
OUT
L = 8.2µH COILCRAFT
MSS6132
V
V
I
LOAD
IN
OUT
0.6
= 3.6V
= 22µF
2.7
= 3.3V
= 200mA
SWITCHING FREQUENCY (MHz)
0.8
3.2
I
V
LOAD
IN
1
20µs/DIV
= 3.6V
V
3.7
= 25mA
IN
1.2
(V)
L = 4.7µH COILCRAFT
MSS7341
V
V
OUT
4.2
1.4
OUT
= 3.3V
= 5V
1.6
4.7
L = 2.2µH
COILCRAFT
1812PS
1.8
3520 G18
5.2
3520 G16
3520 G21
2
BUCK V
200mA/DIV
INDUCTOR
50mV/DIV
CURRENT
140
120
100
OUT
100
80
60
40
20
95
90
85
80
75
70
0
2.2
0.4
V
V
I
Buck-Boost Maximum Output
Current, Burst Mode Operation
Buck Burst Mode Operation
LOAD
Buck Effi ciency vs Frequency
IN
OUT
L = 8.2µH
COILCRAFT
MSS6132
V
V
I
LOAD
IN
OUT
= 3.6V
0.6
= 1.8V
= 2.5V
= 10mA
2.7
= 1.8V
= 100mA
SWITCHING FREQUENCY (MHz)
0.8
3.2
V
R
C
OUT
V
1
OUT
BURST
OUT
10µs/DIV
V
3.7
= 3.3V
IN
= 10µF
L = 4.7µH SUMIDA
CDRH3D16NP
1.2
= 5V
(V)
= 249k
4.2
1.4
L = 2.2µH
SUMIDA
CDRH3D16NP
1.6
4.7
1.8
3520 G19
5.2
3520 G22
3520 G17
2
LTC3520
7
3520f