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LT8640 Datasheet(PDF) 9 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) 9 Page - Analog Devices

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LT8640A
9
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Start-Up Dropout Performance
Start-Up Dropout Performance
Conducted EMI Performance (CISPR25 Conducted
Emission Test with Class 5 Peak Limits)
Transient Response; Load Current
Stepped from 2A to 4A
2A TO 4A TRANSIENT
12VIN, 5VOUT,
FRONT PAGE APPLICATION
fSW = 2MHz
COUT = 100µF, CLEAD = 10pF
20µs/DIV
VOUT
100mV/DIV
ILOAD
2A/DIV
8640a G37
Transient Response; Load Current
Stepped from 100mA to 1.1A
FRONT PAGE APPLICATION
100mA TO 1.1A TRANSIENT
COUT = 100µF
Burst Mode OPERATION
FCM
50µs/DIV
ILOAD
1A/DIV
VOUT
100mV/DIV
8640a G38
12VIN, 5VOUT, fSW = 1MHz
VIN
2V/DIV
VOUT
2V/DIV
100ms/DIV
2.5 LOAD
(2A IN REGULATION)
8640a G39
VIN
VOUT
VIN
2V/DIV
VOUT
2V/DIV
100ms/DIV
20 LOAD
(250mA IN REGULATION)
8640a G40
VIN
VOUT
DC3099A DEMO BOARD
(WITH EMI FILTER INSTALLED)
12V INPUT TO 5V OUTPUT AT 5A, fSW = 2MHz
VOLTAGE METHOD
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
FREQUENCY (MHz)
0
3
6
9
12
15
18
21
24
27
30
–20
–10
0
10
20
30
40
50
60
8640a G41



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