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LT8640 Datasheet(PDF) 6 Page - Analog Devices

Part # LT8640
Description  42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5關A Quiescent Current
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT8640 Datasheet(HTML) 6 Page - Analog Devices

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LT8640A
6
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Top FET Current Limit vs Duty Cycle
LT8640A No-Load Supply Current
Top FET Current Limit
Switch RDS(ON) vs Temperature
EN Pin Thresholds
Load Regulation
Line Regulation
Switch Drop vs Switch Current
TEMPERATURE (°C)
–50
0.99
1.01
150
8640a G11
0.97
0.95
0
50
100
–25
25
75
125
1.03
0.98
1.00
0.96
1.02
EN RISING
EN FALLING
LOAD CURRENT (A)
0
–0.15
–0.10
–0.05
0
0.05
1
2
3
5
8640a G12
0.10
0.15
0.5
1.5
2.5
3.5 4 4.5
VOUT = 5V
VIN = 12V
R1/R2 = 100k/24.3k
INPUT VOLTAGE (V)
5
–0.08
–0.06
–0.04
–0.02
0
0.12
0.06
15
25
30
8640a G13
0.08
0.10
0.04
0.02
10
20
35
40
45
VOUT = 5V
ILOAD = 1A
R1/R2 = 100k/24.3k
VOUT = 3.3V
L = 4.7µH
IN REGULATION
INPUT VOLTAGE (V)
0
5
10 15 20 25 30 35 40 45
1.0
1.5
2.0
2.5
3.0
3.5
4.0
8640a G14
DUTY CYCLE
0.1
0.3
0.5
0.7
0.9
9
10
11
12
13
8640a G15
5% DC
TEMPERATURE (°C)
–50 –25
0
25
50
75 100 125 150
10
11
12
13
14
8640a G16
TEMPERATURE (°C)
–50
100
150
8640a G17
50
0
0
50
100
–25
25
75
125
150
75
125
25
SWITCH CURRENT = 1A
BOTTOM SWITCH
TOP SWITCH
SWITCH CURRENT (A)
0
0
50
150
200
250
500
350
1
2
8640a G18
100
400
450
300
3
5
4
TOP SWITCH
BOTTOM SWITCH
LT8640A-3.3 Output
Reference Voltage
TEMPERATURE (°C)
–50 –25
0
25
50
75 100 125 150
3.27
3.28
3.29
3.30
3.31
3.32
3.33
8640a G10



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