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LT8608 Datasheet(PDF) 5 Page - Linear Technology

Part # LT8608
Description  42V, 1.5A Synchronous Step-Down Regulator with 2.5關A Quiescent Current
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT8608 Datasheet(HTML) 5 Page - Linear Technology

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LT8608/LT8608B
5
Rev C
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Top FET Current Limit
vs Duty Cycle
Top FET Current Limit
vs Temperature
Switch Drop vs Temperature
Switch Drop vs Switch Current
Minimum On-Time
vs Temperature
Minimum Off-Time
vs Temperature
Dropout Voltage vs Load Current
SWITCH CURRENT = 1A
TOP SW
BOT SW
TEMPERATURE (°C)
–50 –30 –10 10 30 50 70 90 110 130 150
200
250
300
350
400
450
500
550
Switch Drop vs Temperature
8608 G12
TOP SW
BOT SW
SWITCH CURRENT (A)
0 0.25 0.50 0.75 1 1.25 1.50 1.75 2
0
100
200
300
400
500
600
700
800
Switch Drop vs Switch Current
8608 G13
IOUT = 1A
TEMPERATURE (°C)
–50 –30 –10 10 30 50 70 90 110 130 150
30
31
32
33
34
35
36
37
38
39
40
Minimum On-Time Vs Temperature
8608 G14
TEMPERATURE (°C)
–50 –30 –10 10 30 50 70 90 110 130 150
80
85
90
95
100
105
110
Minimum Off-Time Vs Temperature
8608 G15
L = XFL4020–222MEC
LOAD CURRENT (A)
0 0.25 0.50 0.75 1 1.25 1.50 1.75 2
0
125
250
375
500
625
750
Dropout Voltage vs Load Current
8608 G16
VOUT = 3.3V
Burst Frequency vs Load Current
Switching Frequency
vs Temperature
RT = 18.2k
TEMPERATURE (°C)
–50
–10
30
70
110
150
1975
1980
1985
1990
1995
2000
2005
2010
2015
2020
2025
Switching Frequency Vs Temperature
8608 G17
LOAD CURRENT (mA)
0
100
200
300
400
500
0
250
500
750
1000
1250
1500
1750
2000
2250
2500
Burst Frequency vs Load Current
8608 G18
VIN = 12V
L = 2.2µH
VOUT = 3.3V
SYNC = 0V OR LT8608 DFN
DUTY CYCLE (%)
0
20
40
60
80
100
2.00
2.25
2.50
2.75
3.00
3.25
Top Fet Current Limit vs Duty Cycle
8608 G10
DUTY CYCLE = 0
TEMPERATURE (°C)
–50
–10
30
70
110
150
2.5
2.6
2.7
2.8
2.9
3.0
3.1
Top FET Current Limit Vs Temperature
8608 G11



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