Datasheet
LT8619/LT8619-5
7
Rev A
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TYPICAL PERFORMANCE CHARACTERISTICS
V
OUT
= 3.3V
f
SW
= 2MHz
FORCED CONTINUOUS MODE
0.2A LOAD
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
0
20
40
60
80
100
120
MINIMUM ON-TIME (ns)
Minimum On Time
8619 G19
0.5A LOAD
NO LOAD
NO LOAD
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
140
150
160
170
180
MINIMUM OFF TIME (ns)
8619 G20
0.5A LOAD
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
–10.0
–7.5
–5.0
–2.5
0
2.5
5.0
7.5
10.0
POWER GOOD, OVERVOLTAGE THRESHOLD (%)
Power Good, Overvoltage Threshold
8619 G21
OV
PPG V
FB
RISING
PPG V
FB
FALLING
NPG V
FB
RISING
NPG V
FB
FALLING
V
FB
– V
PGTH
(mV)
0
20
40
60
80
100
0
25
50
75
100
POWER GOOD DELAY (µs)
8619 G22
V
OUT
= 1.6V, NO LOAD
f
SW
= 700kHz
FORCED CONTINUOUS MODE
V
IN
FALLING
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
2.5
2.6
2.7
2.8
2.9
3.0
V
IN
UVLO (V)
IN
8619 G23
V
IN
RISING
V
IN
= 12V
V
OUT
= 3.3V
FORCED CONTINUOUS MODE
f
SW
= 2MHz
f
SW
= 700kHz
LOAD CURRENT (A)
0
0.2
0.4
0.6
0.8
1.0
1.2
0
2
4
6
8
10
12
I
BIAS
(mA)
BIAS
8619 G24
Minimum Off-Time
Power Good, Overvoltage
Threshold
Power Good Delay V
IN
UVLO
I
BIAS
vs Load
Minimum On-Time
I
BIAS
vs f
SW
I
BIAS
at 700kHz vs Temperature I
BIAS
at 2MHz vs Temperature
1.2A LOAD
1A LOAD
NO LOAD
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
0
2
4
6
8
10
I
BIAS
(mA)
BIAS
8619 G26
V
IN
= 12V
V
OUT
= 3.3V
FORCED CONTINUOUS MODE
(CONTINUOUS OPERATION
ABOVE MAX JUNCTION
TEMPERATURE MAY
PERMANENTLY
DAMAGE THE
DEVICE)
BIAS = V
OUT
0.5A LOAD
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
0
4
8
12
16
20
24
I
BIAS
(mA)
1.2A LOAD
1A LOAD
0.5A LOAD
NO LOAD
I
BIAS
at 2MHz vs Temperature
8619 G27
V
IN
= 12V
V
OUT
= 5V
FORCED CONTINUOUS MODE
(CONTINUOUS OPERATION
ABOVE MAX JUNCTION
TEMPERATURE MAY
PERMANENTLY
DAMAGE THE
DEVICE)
BIAS = V
OUT
0.2
0.6
1.0
1.4
1.8
2.2
0
2
4
6
8
10
V
IN
= 12V
V
OUT
= 3.3V
L = 10µH
FORCED CONTINUOUS MODE
1A LOAD
NO LOAD
f
SW
(MHz)
I
BIAS
(mA)
8619 G25
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