lt3681 Linear Technology Corporation, lt3681 Datasheet - Page 5

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

TYPICAL PERFOR A CE CHARACTERISTICS
700
600
400
300
200
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
500
100
1.0
4.0
3.5
3.0
2.5
2.0
1.5
0.5
0
0
–50
0
0
Switch Voltage Drop
Switching Frequency
Soft Start
R
T
500
0.5
= 45.3kΩ
–25
RUN/SS PIN VOLTAGE (V)
1000
SWITCH CURRENT (mA)
1
0
TEMPERATURE (°C)
1500
1.5
25
2000
50
2
2500
2.5
75
W
3000 3500
100
3
3681 G10
3681 G16
4681 G13
U
3.5
125
1200
1000
800
600
400
200
90
80
70
60
50
40
30
20
10
12
10
0
0
0
8
6
4
2
0
0
Boost Pin Current
Frequency Foldback
RUN/SS Pin Current
0
R
T
200
= 45.3kΩ
500
5
1000
SWITCH CURRENT (mA)
RUN/SS PIN VOLTAGE (V)
400
FB PIN VOLTAGE (mV)
10
1500
600
15
2000
800
20
1000
2500 3000
25
1200 1400
30
T
3681 G11
A
3681 G14
3681 G17
= 25°C unless otherwise noted.
3500
35
1.290
1.285
1.280
1.275
1.270
1.265
1.260
1.255
1.250
140
120
100
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
80
60
40
20
0
0
–50
–50
0
Feedback Voltage
Minimum Switch On-Time
Boost Diode
–25
–25
BOOST DIODE CURRENT (A)
0.5
0
0
TEMPERATURE (°C)
TEMPERATURE (˚C)
25
25
1.0
50
50
LT3681
75
75
1.5
100
100
4681 G12
3681 G15
3681 G18
5
3681f
125
125
2.0