Datasheet

5
LT3431
sn3431 3431fs
Minimum Input Voltage
with 5V Output
LOAD CURRENT (A)
0
INPUT VOLTAGE (V)
3431 G11
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
7.5
7.0
6.5
6.0
5.5
5.0
MINIMUM INPUT
VOLTAGE TO START
MINIMUM INPUT
VOLTAGE TO RUN
SWITCH CURRENT (A)
0123
BOOST PIN CURRENT (mA)
3431 G12
90
80
70
60
50
40
30
20
10
0
Switching Frequency BOOST Pin Current
JUNCTION TEMPERATURE (°C)
–50
FREQUENCY (kHz)
50 100
3431 G10
0
25 75
575
550
525
500
475
450
425
–25 125
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V
C
Pin Shutdown Threshold
JUNCTION TEMPERATURE (°C)
–50
1.5
1.7
2.1
25 75
3431 G13
1.3
1.1
–25 0
50 100 125
0.9
0.7
1.9
THRESHOLD VOLTAGE (V)
Switch Voltage Drop
SWITCH CURRENT (A)
0123
SWITCH VOLTAGE (mV)
3431 G14
450
400
350
300
250
200
150
100
50
0
T
J
= 125°C
T
J
= 25°C
T
J
= –40°C
JUNCTION TEMPERATURE (°C)
–50
SWITCH MINIMUM ON TIME (ns)
400
500
600
25 75
3431 G15
300
200
–25 0
50 100 125
100
0
Switch Minimum ON Time
vs Temperature
JUNCTION TEMPERATURE (°C)
–50
SWITCH PEAK CURRENT LIMIT (A)
50 100
3431 G16
0
25 75
6.00
5.50
5.00
4.50
4.00
3.50
3.00
2.50
–25 125
Switch Peak Current Limit