Datasheet

LT8619/LT8619-5
8
Rev A
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TYPICAL PERFORMANCE CHARACTERISTICS
Forced Continuous Mode No Load
Switching Waveform
Forced Continuous Mode Switching
Waveform at Minimum On-time
Forced Continuous Mode Transient
Load Step from 10mA to 1A
Pulse-Skipping Mode Transient
Load Step from 10mA to 1A
Bust Mode Transient Load Step
from 10mA to 1A
Forced Continuous Mode
Frequency Synchronization
200ns/DIV
V
OUT
(AC)
2mV/DIV
I
L
200mA/DIV
SW
10V/DIV
8619 G28
V
IN
= 12V, V
OUT
= 3.3V
f
SW
= 2MHz, L = 3.3μH, C
OUT
= 22μF
TOP = 200ns/DIV, BOT = 5ns/DIV,
PERSISTENCE MODE
I
L
200mA/DIV
SW
20V/DIV
SW
(ZOOM IN)
10V/DIV
8619 G29
V
IN
= 53.7V, V
OUT
= 3.3V, 0.5A LOAD
f
SW
= 2MHz, L = 3.3μH, C
OUT
= 22μF
20μs/DIV
V
OUT
200mV/DIV
I
LOAD
1A/DIV
SW
10V/DIV
8619 G30
V
IN
= 12V, V
OUT
= 3.3V
f
OSC
= 2MHz, L = 3.3μH, C
OUT
= 22μF
20μs/DIV
8619 G31
V
OUT
200mV/DIV
I
LOAD
1A/DIV
SW
10V/DIV
V
IN
= 12V, V
OUT
= 3.3V
f
OSC
= 2MHz, L = 3.3μH, C
OUT
= 22μF
20μs/DIV
8619 G32
V
OUT
200mV/DIV
I
LOAD
1A/DIV
SW
10V/DIV
V
IN
= 12V, V
OUT
= 3.3V
f
OSC
= 2MHz, L = 3.3μH, C
OUT
= 22μF
V
OUT
(AC)
20mV/DIV
SYNC
2V/DIV
SW
10V/DIV
SW (ZOOM IN)
10V/DIV
SYNC (ZOOM IN)
2V/DIV
8619 G33
V
OUT
(AC, ZOOM IN)
20mV/DIV
TOP = 10μs/DIV, BOT = 200ns/DIV
V
IN
= 12V, V
OUT
= 3.3V, NO LOAD
f
OSC
= 700kHz, L = 10μH, C
OUT
= 22μF
f
SW
(FREE RUNNING) = 700kHZ, f
SYNC
= 1.2MHz
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