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