Datasheet
LT8619/LT8619-5
3
Rev A
For more information www.analog.com
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
EN/UV
= 2V unless otherwise noted (Notes 2, 3)
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Loop
V
IN
Minimum Input Voltage 3.0 V
V
IN
Quiescent Current at No Load V
IN
= 12V, V
EN/UV
= 0V
l
0.6
0.6
1.0
3.0
µA
µA
V
IN
= 12V, V
OUT
= 3.3V, R
T
= 66.5k, V
EN/UV
= 2V, V
SYNC
= 0V
l
6
6
10
18
µA
µA
V
IN
= 12V, V
OUT
= 3.3V, R
T
= 66.5k, V
EN/UV
= 2V, Floats SYNC 10 µA
V
IN
= 12V, V
OUT
= 3.3V, R
T
= 66.5k, V
EN/UV
= 2V, V
SYNC
= INTV
CC
3 mA
V
IN
Current in Regulation V
IN
= 12V, V
OUT
= 3.3V, R
T
= 66.5k, V
EN/UV
= 2V, V
SYNC
= 0V
I
LOAD
= 100µA
I
LOAD
= 1mA
l
l
38
320
65
400
µA
µA
BIAS Pin Current Consumption V
IN
= 12V, V
BIAS
= 3.3V, I
LOAD
= 0.5A, f
OSC
= 700kHz 2.2 mA
Regulated Output Voltage LT8619-5, V
IN
= 12V, V
SYNC
= INTV
CC
, No Load
l
4.975
4.925
5.0
5.0
5.025
5.075
V
Feedback Voltage LT8619, V
IN
= 12V, V
SYNC
= INTV
CC
, No Load
l
0.796
0.788
0.8
0.8
0.804
0.812
V
V
Feedback Voltage Line Regulation
V
IN
= 4V to 50V, V
SYNC
= INTV
CC
l
±0.004 ±0.03 %/V
Feedback Pin Input Current LT8619, V
FB
= 0.8V ±20 nA
Minimum On-Time LT8619, I
LOAD
= 0.5A, V
SYNC
= INTV
CC
l
30 60 ns
Minimum Off-Time 100 150 180 ns
Top Switch Peak Current Limit
l
1.5 1.75 2.0 A
Bottom Switch Current Limit 1.8 A
Bottom Switch Reverse Current Limit V
SYNC
= INTV
CC
0.55 A
Soft-Start Duration V
IN
= 12V, V
OUT
= 3.3V, No Load, C
OUT
= 22µF 0.2 ms
EN/UV to PG High Delay C
INTVCC
= 1µF, V
OUT
= 3.3V, No Load, C
OUT
= 22µF 0.66 ms
EN/UV to PG Low Delay 10 µs
Oscillator and SYNC
Operating Frequency R
T
= 162k
l
260 300 340 kHz
R
T
= 66.5k
l
630 700 770 kHz
R
T
= 20k
l
1.9 2.0 2.1 MHz
Synchronization Frequency f
SYNC
≥ f
OSC
l
0.3 2.2 MHz
SYNC Threshold Frequency Synchronization
Burst Mode Operation
Floats SYNC Pin, Pulse-Skipping Mode
Forced Continuous Mode
0.35
1.6
1
0.6
1.2
2.0
0.95
2.4
V
V
V
V
SYNC Pin Current Built-In Sourcing Current, V
SYNC
= 0V
Built-In Sinking Current, V
SYNC
= 3.3V
–0.2
3.0
µA
µA
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.