lt3681 Linear Technology Corporation, lt3681 Datasheet - Page 4

• Manufacturer Part Number: lt3681
• Description: 36v, 2a, 2.8mhz Step-down Switching Regulator With Integrated Power Schottky Diode
• Manufacturer: Linear Technology Corporation

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