Datasheet

6
LT1339
sn1339 1339fas
TEMPERATURE (°C)
–50
OPERATING FREQUENCY (NORMALIZED)
1.01
1.00
0.99
0.98
25 75
1339 G24
–25 0
50 100 125
TYPICAL PERFORMANCE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
I
B(SINK)
(µA)
60
55
50
45
40
35
30
25 75
1339 G20
–25 0
50 100 125
V
CMSENSE
= 10V
Sense Amplifier Input Bias
Current (Sink) vs TemperatureUVLO Thresholds vs Temperature
Sense Amplifier Input Bias
Current (Source) vs Temperature
RUN/SHDN INPUT VOLTAGE (V)
0
RUN/SHDN INPUT CURRENT (nA )
2.52.0
1339 G22
0.5
1.0
1.5(1.25)
800
700
600
500
400
300
200
100
0
..................................................................
TYPICAL
UPPER
LIMIT
FULL OPERATING
TEMPERATURE
RANGE
LOWER
LIMIT
RUN/SHDN Input Current
vs Pin Voltage
Operating Frequency (Normalized)
vs Temperature
TEMPERATURE (°C)
–50
V
12VIN
(V)
100
1339 G18
050
10.00
9.75
9.50
9.25
9.00
8.75
8.50
8.25
8.00
–25 25 75 125
RISING
FALLING
RUN/SHDN SUPPLY VOLTAGE (V)
0
RUN/SHDN INPUT CURRENT (µA)
600
450
300
150
0
2468
1339 G23
10 12
UPPER
LIMIT
LOWER
LIMIT
TYPICAL
FULL OPERATING
TEMPERATURE
RANGE
RUN/SHDN Input Current
vs Pin Voltage
Maximum Duty Cycle vs R
CT
R
CT
(kΩ)
1246
MAXIMUM DUTY CYCLE (%)
100
90
80
70
60
50
40
30
20
10
0
10 20 40 60 100
1339 G21
I
DISCHG
= 2.1mA
I
DISCHG
= 2.75mA
FULL OPERATING
TEMPERATURE
RANGE
TEMPERATURE (°C)
–50
I
B(SOURCE)
(µA)
100
1339 G19
050
1200
1100
1000
900
800
700
600
500
400
–25 25 75 125
V
CMSENSE
= 0V