LT3970IDDB Ver la hoja de datos (PDF) - Linear Technology
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LT3970IDDB
Linear Technology
LT3970IDDB Datasheet PDF : 22 Pages
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LT3970/LT3970-3.3/LT3970-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
No-Load Supply Current
15
FRONT PAGE APPLICATION
VIN = 12V
12
VOUT = 3.3V
R1 = 1M
R2 = 576k
9
6
3
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3970 G05
Maximum Load Current
550
FRONT PAGE APPLICATION
VOUT = 3.3V
TYPICAL
500
450
MINIMUM
400
350
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3870 G06
Maximum Load Current
600
FRONT PAGE APPLICATION
VOUT = 5V
550
TYPICAL
500
MINIMUM
450
400
350
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3870 G07
Maximum Load Current
600
LIMITED BY CURRENT LIMIT H GRADE
500
400
LIMITED BY MAXIMUM
300 JUNCTION TEMPERATURE;
θJA = 76°C/W
200
100 FRONT PAGE APPLICATION
VIN = 12V
VOUT = 5V
0
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
125 150
3970 G08
Load Regulation
0.20
0.15
0.10
0.05
0
–0.05
–0.10
–0.15 FRONT PAGE APPLICATION
REFERENCED FROM VOUT AT 100mA LOAD
–0.20
0 50 100 150 200 250 300 350
LOAD CURRENT (mA)
3970 G09
Switch Current Limit
800
SWITCH PEAK CURRENT LIMIT
700
600
500
CATCH DIODE VALLEY CURRENT LIMIT
400
300
200
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (oC)
3970 G11
Switching Frequency
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3970 G12
Switch Current Limit
800
700
SWITCH PEAK
CURRENT LIMIT
600
500
CATCH DIODE VALLEY CURRENT LIMIT
400
300
200
0
20
40
60
80
100
DUTY CYCLE (%)
3970 G10
Minimum
Switch On-Time/Switch Off-Time
200
LOAD CURRENT = 175mA
180
160
140
120
MINIMUM OFF-TIME
100
80
MINIMUM ON-TIME
60
40
20
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3970 G13
3970fa
5
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