LT3684
TYPICAL PERFORMANCE CHARACTERISTICS (T = 25°C unless otherwise noted)
A
Feedback Voltage
Switching Frequency
Frequency Foldback
1.290
1.285
1.280
1.275
1.270
1.265
1.260
1.255
1.250
1200
1000
800
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
R
= 45.3k
R
= 45.3k
T
T
600
400
200
0
–50 –25
0
25
50
75 100 125
800
1200 1400
1000
–50 –25
0
25
50
75 100 125
0
200 400 600
TEMPERATURE (°C)
TEMPERATURE (°C)
FB PIN VOLTAGE (mV)
3684 G10
3684 G11
3684 G12
Minimum Switch On-Time
Soft-Start
RUN/SS Pin Current
12
10
8
140
120
4.0
3.5
3.0
100
2.5
2.0
1.5
1.0
0.5
80
60
40
20
6
4
2
0
0
0
20
RUN/SS PIN VOLTAGE (V)
30
35
0
5
10
15
25
0.5
1
2
2.5
3
3.5
–50 –25
0
25
50
75 100 125
0
1.5
TEMPERATURE (˚C)
RUN/SS PIN VOLTAGE (V)
3684 G15
3684 G13
3684 G14
Boost Diode
Error Amp Output Current
Minimum Input Voltage
100
80
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
4.5
4.0
3.5
3.0
60
40
20
0
–20
–40
–60
V
A
= 3.3V
OUT
2.5
2.0
T
= 25°C
L = 4.7µH
f = 800kHz
–80
1.065
1.0
BOOST DIODE CURRENT (A)
0
0.5
1.5
2.0
0.001
0.01
0.1
LOAD CURRENT (A)
1
1.165
1 .265
1.365
1.465
10
FB PIN VOLTAGE (V)
3684 G16
3684 G17
3684 G18
3684f
5
Linear [ Linear ]
