Datasheet

LT3791
7
3791fa
OPENLED Threshold
vs Temperature OVLO Threshold vs Temperature Soft-Start Current vs Temperature
Supply Current vs Input Voltage EN/UVLO Pin Current EN/UVLO Threshold Voltage
TEMPERATURE (°C)
–50
FB VOLTAGE (V)
1.100
1.150
150
3791 G19
1.050
1.000
0
50
100
–25
25
75
125
1.200
1.075
1.125
1.025
1.175
RISING
FALLING
TEMPERATURE (°C)
–50
OVLO THRESHOLD (V)
2.9
3.1
150
3791 G20
2.7
2.5
0
50
100
–25
25
75
125
3.3
2.8
3.0
2.6
3.2
RISING
FALLING
TEMPERATURE (°C)
–50
I
SS
(µA)
8
12
150
3791 G21
4
0
0
50
100
–25
25
75
125
16
6
10
2
14
CHARGING
DISCHARGING
V
IN
(V)
0
I
Q
(mA)
1.5
2.0
2.5
30
50
3791 G22
1.0
0.5
0
10 20 40
3.0
3.5
4.0
60
T
A
= 150°C
T
A
= 25°C
T
A
= –50°C
TEMPERATURE (°C)
–50
EN/UVLO PIN CURRENT (µA)
4
6
150
3791 G23
2
0
0
50
100
–25
25
75
125
8
3
5
1
7
V
EN/ULO
= 1V
TEMPERATURE (°C)
–50
1.10
EN/UVLO THRESHOLD (V)
1.12
1.16
1.18
1.20
1.30
1.24
0
50
75
3791 G24
1.14
1.26
1.28
1.22
–25 25
100
125
150
RISING
FALLING
Oscillator Frequency
vs Temperature
TG1, TG2 Minimum On-Time
vs Temperature
TG1, TG2 Minimum Off-Time
vs Temperature
TEMPERATURE (°C)
–50
SWITCHING FREQUENCY (kHz)
400
600
150
3791 G25
200
0
0
50
100
–25
25
75
125
800
300
500
100
700
R
T
= 29.1k
R
T
= 59.0k
R
T
= 147k
TEMPERATURE (°C)
–50
TG1, TG2 MINIMUM ON-TIME (ns)
60
80
150
3791 G26
40
20
0
50
100
–25
25
75
125
100
50
70
30
90
TG1
TG2
TEMPERATURE (˚C)
–50
TG1, TG2 MINIMUM OFF-TIME (ns)
200
250
300
100 125
3791 G27
150
100
–25 0 25 50 75 150
50
0
350
f
SW
= 200kHz
f
SW
= 400kHz
f
SW
= 700kHz
Typical perForMance characTerisTics
T
A
= 25°C, unless otherwise noted.