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3681 Datasheet(PDF) 4 Page - Linear Technology

Part # 3681
Description  36V, 2A, 2.8MHz Step-Down Switching Regulator with Integrated Power Schottky Diode
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

3681 Datasheet(HTML) 4 Page - Linear Technology

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LT3681
4
3681f
DUTY CYCLE (%)
0
40
3681 G08
2.5
20
60
1.5
1.0
4.0
3.5
3.0
2.0
80
100
TEMPERATURE (
°C)
–40
20
3681 G05
80
60
–20
0
40
50
40
100
90
70
60
80
VIN = 12V
VOUT = 3.3V
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
HIGH TEMPERATURE
Efficiency (VOUT = 5.0V)
Efficiency (VOUT = 3.3V)
No Load Supply Current
No Load Supply Current vs
Temperature
Maximum Load Current
TYPICAL PERFOR A CE CHARACTERISTICS
LOAD CURRENT (A)
0.0001
0
40
30
100
0.001
0.01
0.1
1
10
3681 G01
20
10
60
50
90
80
70
VIN = 24V
VIN = 12V
L: NEC PLC-0745-4R7
f: 800kHz
LOAD CURRENT (A)
0.0001
0
40
30
100
0.001
0.01
0.1
1
10
3681 G02
20
10
60
50
90
80
70
VIN = 12V
VIN = 24V
VIN = 7V
L: NEC PLC-0745-4R7
f: 800kHz
INPUT VOLTAGE (V)
0
70
80
15
3681 G04
40
20
510
20
10
0
90
60
50
30
25
30
35
FRONT PAGE APPLICATION
INPUT VOLTAGE (V)
5
15
3681 G07
2.5
10
20
1.5
1.0
4.0
3.5
3.0
2.0
25
30
VOUT = 5.0V
L = 4.7
µH
f = 800 kHz
Switch Current Limit
INPUT VOLTAGE (V)
5
15
3681 G06
2.5
10
20
1.5
1.0
4.0
3.5
3.0
2.0
25
30
VOUT = 3.3V
L = 4.7
µH
f = 800 kHz
TEMPERATURE (
°C)
–50
2.0
2.5
3.0
125
3681 G09
1.5
1.0
0
0
–25
50
25
100
75
0.5
4.5
4.0
DUTY CYCLE = 10 %
DUTY CYCLE = 90 %
Maximum Load Current
Switch Current Limit
SWITCHING FREQUENCY (MHz)
0
85
1.5
3681 G03
70
60
0.5
1
2
55
50
90
80
75
65
2.5
3
VIN = 12V
VIN = 24V
VOUT = 3.3V
L = 10
µH
LOAD = 1A
Efficiency vs Switching Frequency
TA = 25°C unless otherwise noted.



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