LT3798
TYPICAL PERFORMANCE CHARACTERISTICS
EN/UVLO Threshold
vs Temperature
1.3
EN/UVLO HYSTERESIS CURRENT (μA)
12
T
A
= 25°C, unless otherwise noted.
EN/UVLO Hysteresis Current
vs Temperature
100
90
11.5
80
70
I
Q
(μA)
60
50
40
10.5
30
20
10
10
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3798 G02
V
IN
I
Q
vs Temperature
V
IN
= 24V
V
IN
= 12V
1.28
RISING
EN/UVLO (V)
1.26
11
1.24
FALLING
1.22
1.2
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3798 G01
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3798 G03
V
REF
vs Temperature
2.100
2.075
2.050
V
REF
(V)
2.025
V
REF
(V)
2.000
1.975
1.950
1.925
1.900
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3798 G05
V
REF
vs V
IN
2.05
2.04
2.03
2.02
CURRENT LIMIT (mA)
100
80
60
40
20
120
SENSE Current Limit Threshold
vs Temperature
MAX I
LIM
V
IN
= 24V WITH NO LOAD
2.01
2
1.99
1.98
1.97
1.96
1.95
10
15
NO LOAD
V
IN
= 24V WITH 200μA LOAD
200μA LOAD
MIN I
LIM
V
IN_SENSE
= 34μA
MIN I
LIM
V
IN_SENSE
= 21μA
20
25
V
IN
(V)
30
35
40
3798 G05
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3798 G06
Maximum Oscillator Frequency
vs Temperature
220
5
Minimum Oscillator Frequency
vs Temperature
25
Backup Oscillator Frequency
vs Temperature
195
FREQUENCY (kHz)
FREQUENCY (kHz)
4
V
FB
< V
OVP
FREQUENCY (kHz)
V
OVP
> V
FB
20
3
15
170
2
10
145
1
5
120
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3798 G06a
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3799 G07
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3798 G07a
3798f
4
LINER [ LINEAR TECHNOLOGY ]
