lt4351 Linear Technology Corporation, lt4351 Datasheet - Page 4

• Manufacturer Part Number: lt4351
• Description: Mosfet Diode-or Controller
• Manufacturer: Linear Technology Corporation

Specifications are at T
LT4351
TYPICAL PERFOR A CE CHARACTERISTICS
4
310
308
306
304
302
300
298
296
294
292
290
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
–50
0
Overvoltage Threshold vs V
I
VIN
2
–25
vs Temperature
V
V
V
V
4
IN
IN
IN
IN
= 1.2V
= 5V
= 12V
= 20V
0
TEMPERATURE ( C)
6
2V/DIV
V
SW
8
25
V
IN
V
V
A
10
GATE Pin Turn On and Off
Waveform with 10nF Capacitor
Load
IN
OUT
(V)
= 25 C unless otherwise specified.
50
= 5V
12 14
= 4.9V to 5.1V SQUARE WAVE
75
W
16
IN
100
18
50ns/DIV
4351 G07
4351 G04
U
125
20
TURN OFF
TURN ON
4.5
4.0
3.5
3.0
2.5
2.0
25
20
15
10
0
5
–50 –25
–50
3451 G10
Overvoltage Hysteresis
vs Temperature
I
VDD
V
IN
–25
= 5V
vs Temperature
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
50
50
75
75
5V/DIV
V
V
V
V
V
IN
IN
IN
IN
SW
100
100
= 1.2V
= 5V
= 12V
= 20V
4351 G05
4351 G08
V
L = 4.7 H
Typical SW Pin Waveform
IN
125
125
= 5V
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
20
18
16
14
12
10
500ns/DIV
8
6
4
2
0
0
–50
0
Overvoltage Turn-Off Delay
vs Overvoltage Overdrive
Gate Off Voltage vs Temperature
V
IN
OV VOLTAGE ABOVE THRESHOLD (mV)
= 5V
–25
5
10
0
TEMPERATURE ( C)
15
25
3451 G11
20
50
V
V
V
OUT
V
OUT
IN
IN
25
75
= 5V
= 5V
= 5.1V
= 5V
sn4351 4351fs
100
30
3451 G06
4351 G09
125
35