LT3491 LED Boost Driver overview

Description

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LT3491 is a 1 channel, 12.0 V, 0.02 A/string sync LED Boost Driver. It can drive a maximum of 6 LED (~3.5Vfwd) per string, features a fixed 2300 kHz frequency and is available in 2 package option(s): SC70-8 DFN-6 .

Further characteristics are a feedback voltage of 0.200 V, a typical inductor size of 10.0 uH and a peak efficiency of 76 %.

Parameter and features overview

ParameterValueReplacement
Search Filter
Nr. of Channel 1
V-IN min. 2.5 V
V-IN max. 12.0 V
V-OUT max. 24.0 V
Nr.of LED per string typ. 6
I-OUT/string? 0.02 A
current limit typ. 0.35 A
sync/non-sync sync
Frequency typ. 2300 kHz
Frequency fixed
Frequency min.
Frequency max.
Softstart no
Softstart adjustable no
Down-Mode no
Quiescent current max. 4000 uA
Operating min. -40 °C
Operating max. 85 °C
Junction min.
Junction max.
thermal shutdown typ.
Inductor size typ. 10.0 uH
feedback voltage 0.200 V
Automotive AEC-Q100 no
Topology Boost
Peak Efficiency 76 %
Component count min. 4
DC dimming yes
PWM dimming yes
PWM frequency min. 0.10 kHz
PWM frequency max. 10.0 kHz
digital dimming no
digital interface no
LED flash no
TxMask no
Nr.of current sources 1
Nr.of package options 2
CSP
SC70 SC70-8
SOT
MSOP
QFN/DFN DFN-6
SO/SOIC
SOP
DIP

LT3491 Datasheet

Link to the most up-to-date LT3491 datasheet and the product page for EVM, tools and support information.

LT3491

LT3491 inventory, samples and price

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List with equivalents & alternatives

The following DC/DC LED Boost driver are similar to LT3491. Optional, compare LT3491 side-by-side with other LED driver via the comparison function.

Variation Compare Product Manufacturer Package
0% ISL97634 ISL97634 product overviewISL97634 product overview Intersil TDFN-8
0% LT3591 LT3591 product overviewLT3591 product overview Linear Technology DFN-8
10% LT3465 LT3465 product overviewLT3465 product overview Linear Technology TSOT23-6
10% LT3465A LT3465A product overviewLT3465A product overview Linear Technology TSOT23-6

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3491.

V-IN min. 2.5 V, V-OUT max. 24 V, current limit typ. 0.35 A, Frequency typ. 2300 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74404300082 0.8 3.5 3.7 14.00 4.8 x 4.8 x 3
74406900052 0.5 4.3 5.8 15.00 8 x 8 x 1.5
74407000082 0.8 6.2 5.5 8.50 8 x 8 x 2
744089420082 0.8 3.5 6.7 21.00 4.8 x 4.8 x 3.1
744383350082 0.8 3.5 7.0 30.00 3 x 3 x 1.5
744383360068 0.7 4.5 6.2 22.00 3 x 3 x 2
784383350082 0.8 3.5 7.0 30.00 3 x 3 x 1.5
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