lt3685emse-trpbf Linear Technology Corporation, lt3685emse-trpbf Datasheet - Page 4

• Manufacturer Part Number: lt3685emse-trpbf
• Description: 38v, 2a, 2.4mhz Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

LT3685
TYPICAL PERFOR A CE CHARACTERISTICS
4
100
3.5
3.0
2.5
2.0
1.5
1.0
90
80
70
60
50
5
0
Effi ciency
Maximum Load Current
V
OUT
0.2 0.4 0.6 0.8
= 5V
10
V
IN
= 24V
MINIMUM
TYPICAL
V
LOAD CURRENT (A)
INPUT VOLTAGE (V)
IN
= 12V
15
700
600
400
300
200
500
100
0
1.0
0
Switch Voltage Drop
L: NEC PLC-0745-5R6
f: 800kHz
V
1.2 1.4 1.6 1.8 2.0
20
IN
= 34V
500
W
SWITCH CURRENT (mA)
V
L = 4.7μH
f = 800kHz
25
OUT
1000
= 5V
3685 G01
3685 G04
U
30
1500
2000
4.0
3.5
3.0
2.5
2.0
1.5
1.0
90
85
80
75
70
65
60
55
50
0
Effi ciency
0 0.2 0.4 0.6 0.8
Switch Current Limit
V
3685 G07
OUT
2500
= 3.3V
20
V
V
IN
IN
LOAD CURRENT (A)
DUTY CYCLE (%)
= 12V
= 24V
40
1.0
L: NEC PLC-0745-5R6
f: 800kHz
1.2 1.4 1.6 1.8 2.0
60
V
IN
80
70
60
50
40
30
20
10
0
= 7V
0
Boost Pin Current
V
IN
80
= 34V
500
3685 G05
3685 G02
T
A
SWITCH CURRENT (mA)
100
= 25°C unless otherwise noted.
1000
4.0
3.5
3.0
2.5
2.0
1.5
1.0
3.5
2.5
4.0
3.0
2.0
1.5
1.0
0.5
1500
4.5
0
–50
5
Maximum Load Current
Switch Current Limit
–25
2000
10
0
3685 G08
TYPICAL
MINIMUM
INPUT VOLTAGE (V)
DUTY CYCLE = 10 %
DUTY CYCLE = 90 %
TEMPERATURE (°C)
2500
25
15
50
20
75
V
L = 4.7μH
f = 800 kHz
100
OUT
25
= 3.3V
125
3685 G03
3685 G06
3685f
150
30