lt3680 Linear Technology Corporation, lt3680 Datasheet - Page 4

• Manufacturer Part Number: lt3680
• Description: 36v, 3.5a, 2.4mhz Step-down Switching Regulator With 75?a Quiescent Current
• Manufacturer: Linear Technology Corporation

LT3680
TYPICAL PERFOR A CE CHARACTERISTICS
4
100
130
110
5.5
5.0
4.5
4.0
3.5
3.0
80
90
70
60
50
90
70
50
30
10
5
No Load Supply Current
0
Effi ciency
0
Maximum Load Current
V
T
L = 4.7μH
f = 600kHz
V
L = 4.7μH
f = 600kHz
A
OUT
OUT
= 25°C
0.5
5
= 5V
= 5V
10
OUTPUT CURRENT (A)
10
1
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
V
15
IN
1.5
15
= 24V
V
TYPICAL
MINIMUM
IN
20
= 12V
2
20
V
IN
2.5
= 34V
25
W
V
OUT
25
30
3
= 3.3V
3680 G01
3680 G07
3680 G04
U
3.5
30
35
100
90
80
70
60
50
400
350
300
250
200
150
100
6.0
5.5
5.0
4.5
4.0
3.5
3.0
50
Effi ciency
0
0
–50
V
L = 3.3μH
f = 600kHz
0
OUT
No Load Supply Current
Switch Current Limit
CATCH DIODE: DIODES, INC. PDS360
V
V
0.5
IN
OUT
–25
= 3.3V
= 12V
= 3.3V
20
OUTPUT CURRENT (A)
1
0
V
V
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
HIGH TEMPERATURE
IN
IN
TEMPERATURE (°C)
DUTY CYCLE (%)
= 24V
1.5
= 12V
25
40
V
IN
50
= 34V
2
60
75
2.5
100
80
3
3680 G02
125
3680 G05
3680 G08
T
3.5
A
150
100
= 25°C unless otherwise noted.
100
80
50
90
70
60
Effi ciency
0
V
V
L = 4.7μH
f = 600kHz
5.5
5.0
4.5
4.0
3.5
3.0
2.5
5.5
4.5
IN
OUT
6.0
5.0
4.0
3.5
3.0
2.5
2.0
6.5
= 12V
–50
0.5
5
Maximum Load Current
Switch Current Limit
= 5V
V
T
L = 4.7μH
f = 600kHz
OUT
A
–25
= 25°C
OUTPUT CURRENT (A)
1
= 3.3V
10
0
1.5
MINIMUM
TYPICAL
DUTY CYCLE = 90 %
INPUT VOLTAGE (V)
DUTY CYCLE = 10 %
TEMPERATURE (°C)
25
15
2
50
2.5
20
75
3
100
3680 G03
25
3.5
125
3680 G06
3.0
2.5
2.0
1.5
1.0
0.5
3680 G09
3680f
150
30