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LT1372 データシート(PDF) 4 Page - Linear Technology

部品番号 LT1372
部品情報  4.5A, 500kHz Step-Down Switching Regulator
PDF  24 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LT1372 データシート(HTML) 4 Page - Linear Technology

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4
LT1506
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Pin Voltage
TEMPERATURE (
°C)
–50
2.430
2.425
2.420
2.415
2.410
100
1506 G03
–25
0
25
50
75
125
Switch Peak Current Limit
DUTY CYCLE (%)
0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
80
1506 G02
20
40
60
100
TYPICAL
MINIMUM
Lockout and Shutdown
Thresholds
Shutdown Pin Bias Current
Shutdown Supply Current
JUNCTION TEMPERATURE (
°C)
–50
2.40
2.36
2.32
0.8
0.4
0
25
75
1506 G05
–25
0
50
100
125
LOCKOUT
START-UP
SHUTDOWN
INPUT VOLTAGE (V)
0
25
20
15
10
5
0
510
15
1506 G06
VSHDN = 0V
Shutdown Supply Current
SHUTDOWN VOLTAGE (V)
0
70
60
50
40
30
20
10
0
0.1
0.2
0.3
0.4
1506 G07
VIN = 10V
FREQUENCY (Hz)
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100
10k
100k
10M
1506 G09
1k
1M
GAIN
PHASE
ERROR AMPLIFIER EQUIVALENT CIRCUIT
ROUT
200k
COUT
12pF
VC
RLOAD = 50Ω
VFB 2 × 10
–3
)
(
Error Amplifier Transconductance
Error Amplifier Transconductance
JUNCTION TEMPERATURE (
°C)
–50
2500
2000
1500
1000
500
0
0
50
75
1506 G08
–25
25
100
125
Minimum Input Voltage
with 3.3V Output
LOAD CURRENT (mA)
1
4.1
4.3
4.5
4.7
10
100
1000
1506 G12
3.9
3.7
3.5
3.3
TEMPERATURE (
°C)
–50
–500
– 400
– 300
– 200
–8
–4
0
25
75
1506 G04
–25
0
50
100
125
AT 0.37V SHUTDOWN THRESHOLD.
AFTER SHUTDOWN, CURRENT
DROPS TO A FEW
µA
AT 2.38V LOCKOUT THRESHOLD



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