Datasheet

LT3684
5
3684f
Feedback Voltage
Switching Frequency Frequency Foldback
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
Boost Diode Error Amp Output Current
Minimum Input Voltage
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
1.270
1.280
125
3684 G10
1.260
1.250
0 50 100–25 25 75
1.290
1.265
1.275
1.255
1.285
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.00
1.10
125
3684 G11
0.90
0.80
0 50 100–25 25 75
1.20
R
T
= 45.3k
0.95
1.05
0.85
1.15
FB PIN VOLTAGE (mV)
0
SWITCHING FREQUENCY (kHz)
800
1000
1200
600 1000
3684 G12
600
400
200 400
800 1200 1400
200
0
R
T
= 45.3k
TEMPERATURE (˚C)
–50
MINIMUM SWITCH ON-TIME (ns)
80
100
120
25
3684 G13
60
40
–25 0 50 75 100 125
20
0
140
RUN/SS PIN VOLTAGE (V)
0
SWITCH CURRENT LIMIT (A)
3.5
1.5
3684 G14
2.0
1.0
0.5 1 2
0.5
0
4.0
3.0
2.5
1.5
2.5 3 3.5
RUN/SS PIN VOLTAGE (V)
0
RUN/SS PIN CURRENT (µA)
8
10
12
15 25
3684 G15
6
4
510
20 30 35
2
0
BOOST DIODE CURRENT (A)
0
BOOST DIODE V
f
(V)
0.8
1.0
1.2
2.0
3684 G16
0.6
0.4
0
0.5
1.0
1.5
0.2
1.6
1.4
FB PIN VOLTAGE (V)
1.065
–80
V
C
PIN CURRENT (µA)
–60
–20
0
20
1 .265 1.465
100
3684 G17
–40
1.165 1.365
40
60
80
LOAD CURRENT (A)
0.001
INPUT VOLTAGE (V)
3.0
3.5
10
3684 G18
2.5
2.0
0.01
0.1
1
4.5
4.0
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7µH
f = 800kHz
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)