LTC3520 Linear Technology, LTC3520 Datasheet - Page 6

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

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LTC3520
TYPICAL PERFORMANCE CHARACTERISTICS
6
400
350
300
250
200
150
100
45
40
35
30
25
20
15
50
10
0
5
0
– 45
2.2
Buck R
Buck Burst Mode Threshold
V
L = 4.7µH
OUT
– 25
2.7
= 1.8V
DS(ON)
R
BURST
–5
3.2
TEMPERATURE (°C)
= 249k
NMOS
PMOS
–0.2
–0.4
–0.6
–0.8
–1.0
V
3.7
15
1.0
0.6
0.4
0.2
0.8
IN
0
– 40
(V)
Buck Feedback Voltage
R
4.2
35
BURST
– 20
55
4.7
= 301k
R
= 274k
BURST
TEMPERATURE (°C)
0
3520 G11
75
5.2
3520 G09
20
40
–0.5
– 1.5
–1.0
–2.0
2.0
1.5
1.0
0.5
45
40
35
30
25
20
15
10
60
0
5
0
– 45
2.2
Buck Burst Mode Threshold
V
Switching Frequency
L = 3.3µH
OUT
3520 G14
80
– 25
2.7
R
= 1.2V
BURST
3.2
–5
TEMPERATURE (°C)
= 249k
V
3.7
15
IN
R
(V)
BURST
4.2
35
= 301k
4.7
55
100
90
80
70
60
50
40
30
20
10
0
2.2
No Load Input Current
3520 G09b
BUCK AND BUCK-BOOST
CONVERTERS ENABLED,
Burst Mode OPERATION
5.2
3520 G12
75
2.7
3.2
–0.2
–0.4
–0.6
–0.8
–1.0
250
200
150
100
1.0
0.6
0.4
0.2
0.8
50
3.7
V
0
0
– 40
– 45
IN
Buck-Boost R
Buck-Boost Feedback Voltage
(V)
4.2
– 20
– 25
(SWITCHES B AND C)
(SWITCHES A AND D)
4.7
–5
TEMPERATURE (°C)
TEMPERATURE (°C)
0
3520 G15
DS(ON)
NMOS
5.2
PMOS
20
15
35
40
60
55
3520 G13
3520 G10
75
80
3520f