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LT8640 Datasheet(PDF) 13 Page - Analog Devices

Part # LT8640
Description  42V, 10A/12A Peak Synchronous Step-Down Silent Switcher
PDF  35 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT8640 Datasheet(HTML) 13 Page - Analog Devices

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Data Sheet
LT8638-2
analog.com
Rev.0
13 of 35
Figure 28. PG Thresholds Below VREF
Figure 29. RT Programmed Switching Frequency
Figure 30. Minimum Input Voltage
Figure 31. Bias Pin Current vs. Input Voltage
Figure 32. Bias Pin Current vs. Switching Frequency
Figure 33. Case Temperature Rise
–9.5
–9.0
–8.5
–8.0
–7.5
–7.0
–6.5
–6.0
FB RISING
FB FALLING
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
fSW = 2MHz
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
fSW = 2MHz
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
INPUT VOLTAGE (V)
5
10
15
20
25
30
35
40
17
18
19
20
21
22
23
24
VBIAS = 5V
VOUT = 5V
fSW = 1MHz
FC MODE
IOUT = 0A
IOUT = 1A
VIN = 12V
VOUT = 5V
VBIAS = 5V
FC MODE
SWITCHING FREQUENCY (MHz)
0
0.5
1.0
1.5
2.0
2.5
3.0
0
6
12
18
24
30
36
42
48
54
60
IOUT = 0A
IOUT = 1A
DEMO BOARD ON STILL AIR
L = XEL6060, XEL6030
VOUT = 3.3V
VIN = 12V, fSW = 400kHz, L = 2.2µH
VIN = 24V, fSW = 400kHz, L = 2.2µH
VIN = 12V, fSW = 2MHz, L = 0.47µH
VIN = 24V, fSW = 2MHz, L = 0.47µH
LOAD CURRENT (A)
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