LT3597
4
3597fa
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V, BOOST = 29V, BIAS = 5V, EN/UVLO = 5V, PWM1-3 = 3.3V,
CTRL1-3 = CTRLM = T
SET
= 2.0V, V
OUT1-3
= 24V, SYNC = 0V, unless otherwise specified. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
LED String Current Matching R
ISET1-3
= 20k
l
±0.35
±0.35
±1.5
±2
%
%
LED Pin Voltage Adaptive V
OUT
Loop Enabled 1.1 V
LED1-3 Open Detection Threshold 0.28 V
LED1-3 Short Protection Threshold (from GND) PWM1-3 = 3.3V 10 15 V
LED1-3 Short Protection Threshold (from V
OUT1-3
) V
OUT1-3
= 6V 1 1.25 2 V
LED1-3 Pin Leakage Current V
LED1-3
= 42V 200 nA
PWM1-3 Input Low Voltage 0.4 V
PWM1-3 Input High Voltage 1.6 V
PWM1-3 Pin Bias Current 200 nA
CTRL1-3 Voltage for Full LED Current 1.2 V
CTRL1-3 Pin Bias Current CTRL1-3 = 6V 200 nA
CTRLM Voltage for Full LED Current 1.2 V
CTRLM Pin Bias Current CTRLM = 3V 200 nA
FAULT Output Voltage Low I
FAULT
= 200µA 0.11 V
FAULT Pin Input leakage Current FAULT = 25V 200 nA
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 LT3597E is guaranteed to meet performance specifications
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
LT3597I specifications are guaranteed over the full –40°C to 125°C
operating junction temperature range.
Note 3: For Maximum Operating Ambient Temperature, see Thermal
Considerations in the Applications Information section.
Note 4: Guaranteed by design.
