Datasheet

LT3791
3
3791fa
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, V
EN/UVLO
= 12V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Logic Inputs
EN/UVLO Falling Threshold
l
1.16 1.2 1.24 V
EN/UVLO Rising Hysteresis 15 mV
EN/UVLO Input Low Voltage I
VIN
Drops Below 1µA 0.3 V
EN/UVLO Pin Bias Current Low V
EN/UVLO
= 1V 2 3 4 µA
EN/UVLO Pin Bias Current High V
EN/UVLO
= 1.6V 10 100 nA
CTRL Input Bias Current V
CTRL
= 1V 20 50 nA
CTRL Latch-Off Threshold 175 mV
OVLO Rising Shutdown Voltage
l
2.85 3 3.15 V
OVLO Falling Hysteresis 75 mV
Regulation
V
REF
Voltage
l
1.96 2.00 2.04 V
V
REF
Line Regulation 4.7V < V
IN
< 60V 0.002 0.04 %/V
V
(ISP-ISN)
Threshold V
CTRL
= 2V
l
97.5
94
100
100
102.5
106
mV
mV
V
CTRL
= 1100mV
l
87
84
90
90
93
96
mV
mV
V
CTRL
= 700mV
l
47.5
46
50
50
52.5
54
mV
mV
V
CTRL
= 300mV
l
6.5
5
10
10
13.5
15
mV
mV
ISP Bias Current 110 µA
ISN Bias Current 20 µA
LED Current Sense Common Mode Range 0 60 V
LED Current Sense Amplifier g
m
890 µS
ISMON Monitor Voltage V
(ISP-ISN)
= 100mV
l
0.96 1 1.04 V
Input Current Sense Threshold V
(IVINP-IVINN)
3V ≤ V
IVINP
≤ 60V
l
46.5 50 54 mV
IVINP Bias Current 90 µA
IVINN Bias Current 20 µA
Input Current Sense Common Mode Range 3 60 V
Input Current Sense Amplifier g
m
2.12 mS
IVINMON Monitor Voltage V
(IVINP-IVINN)
= 50mV
l
0.96 1 1.04 V
FB Regulation Voltage
l
1.194
1.176
1.2
1.2
1.206
1.220
V
V
FB Line Regulation 4.7V < V
IN
< 60V 0.002 0.025 %/V
FB Amplifier g
m
565 µS
FB Pin Input Bias Current FB in Regulation 100 150 nA
V
C
Standby Input Bias Current PWM = 0V –20 20 nA
V
SENSE(MAX)
(V
SNSP-SNSN
) Boost
Buck
l
l
42
–56
51
–47.5
60
–39
mV
mV
Fault
SS Pull-Up Current V
SS
= 0V 14 µA
SS Discharge Current 1.4 µA
FB Overvoltage Rising Threshold 1.22 1.25 V
Open LED Rising Threshold (V
FB
) V
(ISP-ISN)
= 0V
l
1.127 1.15 1.173 V