Datasheet

LT3481
4
3481fc
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT(A)
40
3481 G08
2.5
20 60
1.5
1.0
4.0
3.5
3.0
2.0
80 100
TEMPERATURE (°C)
–50
SUPPLY CURRENT (μA)
350
25
3481 G05
200
100
–25 0 50
50
0
400
300
250
150
75 100 125 150
V
IN
= 12V
V
OUT
= 3.3V
CATCH DIODE: DIODES, INC. PDS360
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
HIGH TEMPERATURE
Effi ciency (V
OUT
= 5.0V)
Effi ciency (V
OUT
= 3.3V)
No Load Supply Current No Load Supply Current
Maximum Load Current
LOAD CURRENT (A)
0.0001
0
EFFICIENCY (%)
40
30
100
0.001 0.01 0.1 1 10
3481 G01
20
10
60
50
90
80
70
V
IN
= 24V
V
IN
= 12V
L: NEC PLC-0745-4R7
f: 800kHz
LOAD CURRENT (A)
0.0001
0
EFFICIENCY (%)
40
30
100
0.001 0.01 0.1 1 10
3481 G02
20
10
60
50
90
80
70
V
IN
= 12V
V
IN
= 24V
V
IN
= 7V
L: NEC PLC-0745-4R7
f: 800kHz
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (μA)
70
15
3481 G04
40
20
510 20
10
0
80
60
50
30
25 30 35
T
A
= 25°C
FRONT PAGE APPLICATION
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
3481 G07
2.5
10 20
1.5
1.0
4.0
3.5
3.0
2.0
25 30
TYPICAL
MINIMUM
V
OUT
= 5.0V
T
A
= 25°C
L = 4.7μH
f = 800kHz
Switch Current Limit
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
3481 G06
2.5
10 20
1.5
1.0
4.0
3.5
3.0
2.0
25 30
TYPICAL
MINIMUM
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7μH
f = 800kHz
TEMPERATURE (°C)
–50
SWITCH CURRENT LIMIT (A)
2.0
2.5
3.0
125
3481 G09
1.5
1.0
0
0–25 5025 10075
0.5
4.5
4.0
DUTY CYCLE = 10 %
DUTY CYCLE = 90 %
Maximum Load Current
Switch Current Limit
SWITCHING FREQUENCY (MHz)
0
EFFICIENCY (%)
85
1.5
3481 G03
70
60
0.5 1 2
55
50
90
80
75
65
2.5 3
V
IN
= 12V
V
IN
= 24V
V
OUT
= 3.3V
L = 10μH
LOAD = 1A
Effi ciency
TYPICAL PERFORMANCE CHARACTERISTICS