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LT8640 Datasheet(PDF) 4 Page - Analog Devices

Part # LT8640
Description  18V, 10A Synchronous Step-Down Silent Switcher
PDF  26 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT8640 Datasheet(HTML) 4 Page - Analog Devices

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LT8642-1
4
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Frequency
12VIN to 1.2VOUT Low Load
Efficiency
12VIN to 1.2VOUT Efficiency
12VIN to 1VOUT Efficiency
Efficiency vs VIN
12VIN to 3.3VOUT Efficiency
12VIN to 5VOUT Efficiency
VOUT = 1.2V
fSW = 2MHz
ILOAD = 5A
L = XEL6060, 1µH (DCR = 3.7mΩ)
INPUT VOLTAGE (V)
3
6
9
12
15
18
80
82
84
86
88
90
92
94
96
86421 G05
VIN = 12V
VOUT = 1.2V
ILOAD = 5A
L = XEL6060, 2.2µH (DCR = 6.1mΩ)
SWITCHING FREQUENCY (MHz)
0
0.5
1
1.5
2
2.5
3
70
75
80
85
90
95
100
86421 G07
VIN = 12V, VBIAS = 3.3V
Burst Mode OPERATION
fSW = 2MHz
L = XEL6030, 0.28µH (DCR = 2.1mΩ)
LOAD CURRENT (mA)
0.1
1
10
100
1000
0
10
20
30
40
50
60
70
80
90
100
86421 G06
EFFICIENCY
POWER LOSS
VBIAS = 3.3V
L = XEL6030, 0.28µH (DCR = 2.1mΩ)
1MHz
2MHz
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
9 10
60
65
70
75
80
85
90
95
100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
86421 G01
POWER LOSS
VBIAS = 3.3V
L = XEL6060, XEL6030
EFFICIENCY
1MHz, L = 0.56µH (2.6mΩ)
2MHz, L = 0.28µH (2.1mΩ)
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
9 10
60
65
70
75
80
85
90
95
100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
86421 G02
EFFICIENCY
POWER LOSS
VBIAS = VOUT
L = XEL6060
1MHz, L = 1.5µH (4.3mΩ)
2MHz, L = 0.82µH (3mΩ)
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
9 10
60
65
70
75
80
85
90
95
100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
86421 G03
EFFICIENCY
POWER LOSS
VBIAS = VOUT
L = XEL6060
1MHz, L = 2.2µH (6.1mΩ)
2MHz, L = 1µH (3.7mΩ)
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
9 10
60
65
70
75
80
85
90
95
100
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
12VIN to 5VOUT Efficiency
86421 G04



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