LT3434 데이터 시트보기 (PDF) - Linear Technology
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LT3434
Linear Technology
LT3434 Datasheet PDF : 24 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LT3434
Switch Peak Current Limit
6.0
5.5
5.0
4.5
4.0
3.5
3.0
–50 –25
–0 25 50 75
TEMPERATURE (°C)
100 125
3434 G10
Switch On Voltage (VCESAT)
500
450
400
TJ = 125°C
350
300
TJ = 25°C
250
200
150
TJ = –40°C
100
50
0
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
3434 G13
Burst Mode Threshold vs Input
Voltage
900
VOUT = 3.3V
800 L = 33µH
COUT = 100µF
700
600
BURST MODE EXIT
500
(INCREASING LOAD)
400
300
200
BURST MODE ENTER
(DECREASING LOAD)
100
0
5
10
15
20
INPUT VOLTAGE (V)
3434 G21
Soft-Start Threshold
vs FB Voltage
50
TJ = 25°C
45
40
35
SOFT-START
30
DEFEATED
25
20
15
10
5
0
0 0.2 0.4 0.6 0.8 1.0 1.2
FB VOLTAGE (V)
3434 G11
Supply Current vs Input Voltage
150
VOUT = 3.3V
125
100
75
50
25
0
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
3434 G20
Minimum On Time for Continuous
Mode Operation
700
650
600
550
LOAD CURRENT = 0.5A
500
450
400
350 LOAD CURRENT = 1A
300
250 LOAD CURRENT = 2A
200
–50 –25
–0 25 50 75
TEMPERATURE (°C)
100 125
3434 G22
Oscillator Frequency
vs FB Voltage
250
TJ = 25°C
200
150
100
50
0
0 0.2 0.4 0.6 0.8 1.0 1.2
FB VOLTAGE (V)
3434 G12
Minimum Input Voltage
8.0
7.5
7.0
START-UP RUNNING
6.5
6.0
VOUT = 5V
5.5
5.0
START-UP
4.5
VOUT = 3.3V
4.0
RUNNING
3.5
3.0
0
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
3434 G19
Boost Current vs Load Current
70
60
50
40
30
20
10
0
0 0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
3434 G23
3434f
5
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