Datasheet

LTC3520
6
3520fa
V
IN
(V)
2.2
OUTPUT CURRENT (mA)
3.7
3520 G09b
2.7 3.2 4.2 4.7 5.2
0
10
15
20
25
30
35
40
45
5
L = 3.3μH
R
BURST
= 249k
R
BURST
= 301k
TEMPERATURE (°C)
–40
CHANGE FROM T = 25°C (%)
20
3520 G14
–20 0 40 60 80
–1.0
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
–0.8
TEMPERATURE (°C)
–40
CHANGE FROM T = 25°C (%)
20
3520 G13
–20 0 40 60 80
–1.0
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
–0.8
TEMPERATURE (°C)
–45
R
DS(ON)
(mΩ)
350
15
3520 G11
200
100
–25 –5 35
50
0
400
300
250
150
55 75
PMOS
NMOS
TEMPERATURE (°C)
–45
SWITCHING FREQUENCY, CHANGE FROM 25°C (%)
1.5
15
3520 G12
0
–1.0
–25 –5 35
–1.5
–2.0
2.0
1.0
0.5
–0.5
55 75
TYPICAL PERFORMANCE CHARACTERISTICS
Buck Burst Mode Threshold
V
OUT
= 1.2V
Buck R
DS(ON)
Switching Frequency Buck-Boost Feedback Voltage
Buck Feedback Voltage
No Load Input Current
V
IN
(V)
2.2
0
NO LOAD CURRENT (μA)
10
30
40
50
100
70
3.2
4.2
4.7
20
80
90
60
2.7
3.7
5.2
3520 G15
BUCK AND BUCK-BOOST
CONVERTERS ENABLED,
Burst Mode OPERATION
V
IN
(V)
2.2
OUTPUT CURRENT (mA)
3.7
3520 G09
2.7 3.2 4.2 4.7 5.2
0
5
15
25
10
20
30
35
40
45
L = 4.7μH
R
BURST
= 249k
R
BURST
= 274k
R
BURST
= 301k
TEMPERATURE (°C)
–45
R
DS(ON)
(mΩ)
250
15
3520 G10
200
100
–25 –5 35
50
0
150
55 75
PMOS
(SWITCHES A AND D)
NMOS
(SWITCHES B AND C)
Buck Burst Mode Threshold
V
OUT
= 1.8V
Buck-Boost R
DS(ON)
Buck Output Voltage vs
Load Current
LOAD CURRENT (mA)
–3
CHANGE IN VOLTAGE FROM 100mA LOAD (%)
3
2
1
–2
–1
0
200
400
600
3520 G23
0
T
A
= –40°C, 25°C
T
A
= 85°C
T
A
= 125°C