Datasheet

4
LT1249
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
I
AC
(µA)
0
I
M
(µA)
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
TIME (ns)
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(°C)
–75
FREQUENCY (kHz)
75
1249 G10
–25 25 125
140
130
120
110
100
90
80
70

–50 0 50 100
JUNCTION TEMPERATURE (°C)
–75
REFERENCE VOLTAGE (V)
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
SUPPLY CURRENT (mA)
10
9
8
7
6
5
4
3
2
1
0
26
1249 G05
1412 16 20 24 28
18
22
30
T
J
= –55°C
T
J
= 25°C
T
J
= 125°C
Supply Current vs Supply Voltage GTDR Source Current
SOURCE CURRENT (mA)
0
GTDR VOLTAGE (V)
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°C
T
J
= 125°C
V
CC
= 18V
T
J
= –55°C
–60
–120 –180 –240
GTDR Sink Current
SINK CURRENT (mA)
0
GTDR VOLTAGE (V)
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°C
T
A
= –55°C
60
120 180 240
T
A
= 25°C
GTDR Rise and Fall Time
Reference Voltage vs
Temperature Multiplier Current
SUPPLY VOLTAGE (V)
0
SUPPLY CURRENT (µA)
550
500
450
400
350
300
250
200
150
100
50
0
1249 G09
20
125°C
–55°C
25°C
4
81216
2610
14 18