lt3781 Linear Technology Corporation, lt3781 Datasheet - Page 5

• Manufacturer Part Number: lt3781
• Description: Bootstrap Start Dual Transistor Synchronous Forward Controller
• Manufacturer: Linear Technology Corporation

TYPICAL PERFOR A CE CHARACTERISTICS
5.10
5.05
5.00
4.95
4.90
5.2
5.1
5.0
4.9
4.8
25
20
15
10
–55
–55
–55
I
vs Temperature
5V
V
vs Temperature
BST
C
–40
–40
–40
REF
Pin Short-Circuit Current Limit
Boost Supply Current
Voltage vs Temperature
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
0
40
40
40
W
80
80
80
3781 G07
3781 G04
3781 G10
U
125
125
125
20
60
40
60
50
40
30
12
11
10
0
9
8
–55
–55
0
I
vs SHDN Pin Voltage
5V
vs Temperature
Soft-Start Output Current
vs Temperature
T
CC
V
A
SS
–40
–40
REF
= 25 C
Supply Current
= 2V
0.2
Short-Circuit Current Limit
SHDN PIN VOLTAGE (V)
TEMPERATURE ( C)
TEMPERATURE ( C)
0.4
0
0
0.6
40
40
0.8
80
80
1.0
3781 G05
3781 G08
3781 G11
1.2
125
125
1.260
1.255
1.250
1.245
1.240
0.8
0.6
0.5
60
40
20
1
0
–55
–55
0
UVLO I
vs Temperature
Soft-Start Output Current
vs Soft-Start Pin Voltage
Error Amp Reference
vs Temperature
–40
–40
SOFT-START PIN VOLTAGE (mV)
100
CC
Supply Current
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
200
40
40
300
LT3781
80
80
400
T
A
= 25 C
3781 G06
3781 G12
3781 G09
5
3781f
125
500
125