LT3905
4
3905fa
For more information www.linear.com/LT3905
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3905E is guaranteed to meet specified performance
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT3905I is guaranteed to meet performance specifications over the –40°C
to 125°C operating junction temperature range.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Regulation Buffer Amplifier
ILIM_MON Voltage Regulation Threshold (V
IFB
) V
FB
= 0.5V
l
1.223
1.211
1.248 1.273
1.285
V
V
ILIM_MON APD Current Limit Threshold (V
ILIM
)
l
1.323
1.311
1.348 1.373
1.385
V
V
ILIM_MON APD Current Limit Line Regulation
V
APD
= 0V, ∆I
APD
/∆V
MONIN
, 5V < V
MONIN
< 65V 10 μA/V
ILIM_MON Indicator Threshold V
ILIM_MON
Rising
l
V
ILIM
– 30 V
ILIM
– 10 V
ILIM
– 2 mV
ILIM_MON Indicator Hysteresis 30 mV
Inputs/Outputs
EN/UVLO Threshold V
ENUVLO
Falling
l
1.128
1.104
1.200
1.200
1.272
1.296
V
V
EN/UVLO Internal Hysteresis V
ENUVLO
Rising 25 mV
EN/UVLO Hysteresis Current V
ENUVLO
= 1.1V, Device in Shutdown
V
ENUVLO
= 1.3V, Device in Operation
3
0
µA
µA
f
SEL
Voltage Threshold f
SEL
Rising 0.700 0.900 1.100 V
f
SEL
Threshold Hysteresis 50 mV
f
SEL
Input Bias Current 0 µA
LOS Open Drain ON Resistance I
LOS
= 1mA 100 Ω
LOS Output Low Voltage I
LOS
= 2mA 0.3 V
LOS Off-State Leakage V
IN
= V
LOS
= 12V 1 µA
ILIM Open Drain ON Resistance I
ILIM
= 1mA 100 Ω
ILIM Output Low Voltage I
ILIM
= 2mA 0.3 V
ILIM Off-State Leakage V
ILIM
= 12V 1 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
ENUVLO
= V
CTRL
= 3.3V unless otherwise noted.
