Datasheet

LT8640/LT8640-1
9
Rev.C
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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 100mA (Burst Mode
Operation) to 1.1A
I
L
1A/DIV
V
OUT
100mV/DIV
50µs/DIV
FRONT PAGE APPLICATION
1A TO 2A TRANSIENT
12V
IN
, 5V
OUT
C
OUT
= 47µF
8640 G37
I
L
1A/DIV
V
OUT
200mV/DIV
50µs/DIV
FRONT PAGE APPLICATION
100mA (Burst Mode OPERATION) TO
1.1A TRANSIENT
12V
IN
, 5V
OUT
C
OUT
= 47µF
8640 G38
V
IN
2V/DIV
V
OUT
2V/DIV
100ms/DIV
2.5Ω LOAD
(2A IN REGULATION)
8640 G39
V
IN
V
OUT
V
IN
2V/DIV
V
OUT
2V/DIV
100ms/DIV
20Ω LOAD
(250mA IN REGULATION)
8640 G40
V
IN
V
OUT
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
FIXED FREQUENCY MODE
SPREAD SPECTRUM MODE
8640 G41
DC2202A DEMO BOARD
(WITH EMI FILTER INSTALLED)
14V INPUT TO 5V OUTPUT AT 4A, f
SW
= 2MHz
Conducted EMI Performance
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