Datasheet

LT3798
4
3798fa
TYPICAL PERFORMANCE CHARACTERISTICS
V
REF
vs Temperature V
REF
vs V
IN
SENSE Current Limit Threshold
vs Temperature
Minimum Oscillator Frequency
vs Temperature
Backup Oscillator Frequency
vs Temperature
Maximum Oscillator Frequency
vs Temperature
EN/UVLO Threshold
vs Temperature
EN/UVLO Hysteresis Current
vs Temperature V
IN
I
Q
vs Temperature
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–50 0
50
75
–25
25
100 125
150
3798 G01
1.2
EN/UVLO (V)
1.22
1.26
1.24
1.28
1.3
RISING
FALLING
TEMPERATURE (°C)
–50 0
50
75
–25
25
100 125
150
3798 G02
10
10.5
EN/UVLO HYSTERESIS CURRENT (µA)
11
11.5
12
TEMPERATURE (°C)
–50 0
50
75
–25
25
100 125
150
3798 G03
0
I
Q
(µA)
20
10
30
40
60
50
100
90
80
70
V
IN
= 12V
V
IN
= 24V
TEMPERATURE (°C)
–50
1.900
V
REF
(V)
1.925
1.975
2.000
2.025
2.100
2.075
0
50
75
1.950
2.050
–25
25
100 125
150
3798 G05
V
IN
= 24V WITH NO LOAD
V
IN
= 24V WITH 200µA LOAD
V
IN
(V)
10
1.95
V
REF
(V)
1.96
1.98
1.99
2
2.01
2.05
2.03
2.04
1.97
2.02
15
25
20
30 35
40
3798 G05
NO LOAD
200µA LOAD
TEMPERATURE (°C)
–50
0
CURRENT LIMIT (mA)
20
60
80
100
120
0
50
75
40
–25
25
100 125
150
3798 G06
MAX I
LIM
MIN I
LIM
V
IN_SENSE
= 34µA
MIN I
LIM
V
IN_SENSE
= 21µA
TEMPERATURE (°C)
–50
120
FREQUENCY (kHz)
145
195
220
0
50
75
170
–25
25
100
125
150
3798 G06a
TEMPERATURE (°C)
–50
0
FREQUENCY (kHz)
2
3
4
5
0
50
75
1
–25
25
125100
150
3799 G07
V
FB
< V
OVP
V
OVP
> V
FB
TEMPERATURE (°C)
–50
0
FREQUENCY (kHz)
10
15
20
25
0
50
75
5
–25
25
125100
150
3798 G07a