Datasheet

LT8641
8
Rev B
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TYPICAL PERFORMANCE CHARACTERISTICS
Start-Up Dropout Performance
Start-Up Dropout Performance
Transient Response; Load Current
Stepped from 1A to 2A
Transient Response; Load Current
Stepped from 300mA (Burst Mode
Operation) to 1.3A
V
IN
2V/DIV
V
OUT
2V/DIV
100ms/DIV
2.5Ω LOAD
(2A IN REGULATION)
8641 G39
V
IN
V
OUT
V
IN
2V/DIV
V
OUT
2V/DIV
100ms/DIV
20Ω LOAD
(250mA IN REGULATION)
8641 G40
V
IN
V
OUT
Conducted EMI Performance
FRONT PAGE APPLICATION
1A TO 2A TRANSIENT
12V
IN
, 5V
OUT
C
OUT
= 47µF
50µs/DIV
I
LOAD
1A/DIV
V
OUT
100mA/DIV
8641 G37
FRONT PAGE APPLICATION
300mA (Burst Mode OPERATION) TO
1.3A TRANSIENT
12V
IN
, 5V
OUT
C
OUT
= 47µF
50µs/DIV
I
LOAD
1A/DIV
V
OUT
200mA/DIV
8641 G38
AMPLITUDE (dBµV)
40
50
60
30
20
10
0
–10
–20
–40
–30
FREQUENCY (MHz)
0 27
3 6 9
1512 18
21 24
30
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
8641 G41
DC2373A DEMO BOARD
(WITH EMI FILTER INSTALLED)
14V INPUT TO 5V OUTPUT AT 3.5A, f
SW
= 2MHz
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