4
LT1249
TYPICAL PERFORMANCE CHARACTERISTICS
W
I
AC
 (礎)
0
300
150
0
1249 G04
250
500
VA
OUT
 = 6.5V
VA
OUT
 = 6V
VA
OUT
 = 5.5V
VA
OUT
 = 5V
VA
OUT
 = 4.5V
VA
OUT
 = 4V
VA
OUT
 = 3.5V
VA
OUT
 = 3V
VA
OUT
 = 2.5V
VA
OUT
 = 2V
LOAD CAPACITANCE (nF)
0
400
300
200
100
0
10
20
30
40
1249 G08
50
RISE TIME
NOTE: GTDR SLEWS
BETWEEN 1V AND 16V
FALL TIME
Start-Up Supply Current vs
Supply Voltage
Switching Frequency
TEMPERATURE (癈)
75
75
124
1
25
25
125
140
130
120
110
100
90
80
70
50
0
50
100
JUNCTION TEMPERATURE (癈)
75
75
7.536
7.524
7.512
7.500
7.488
7.476
7.464
7.452
7.440
7.428
1249 G03
50
150
25
0   25   50
100 125
SUPPLY VOLTAGE (V)
10
10
9
8
7
6
5
4
3
2
1
0
26
1249 G05
14
12
16
20
24
28
18
22
30
T
J
 = 55癈
T
J
 = 25癈
T
J
 = 125癈
Supply Current vs Supply Voltage
GTDR Source Current
SOURCE CURRENT (mA)
0
18.5
18.0
17.5
17.0
16.5
16.0
15.5
15.0
14.5
14.0
13.5
13.0
1249 G06
300
T
J
 = 25癈
T
J
 = 125癈
V
CC
 = 18V
T
J
 = 55癈
60
120    180    240
GTDR Sink Current
SINK CURRENT (mA)
0
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1249 G07
300
T
A
 = 125癈
T
A
 = 55癈
60
120
180
240
T
A
 = 25癈
GTDR Rise and Fall Time
Reference Voltage vs
Temperature
Multiplier Current
SUPPLY VOLTAGE (V)
0
550
500
450
400
350
300
250
200
150
100
50
0
1249 G09
20
125癈
55癈
25癈
4
8
12
16
2
6
10
14
18
相关PDF资料
LT1577CS-3.3/2.8#TRPBF IC REG CTRLR DUAL OUT 16SOIC
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