LT3491 LED Boost Driver overview
Description
Manufacturer
Category
Sub-Category
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
Parameter | Value | Replacement 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 | ![]() |
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Softstart adjustable | ![]() |
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Down-Mode | ![]() |
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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 | ![]() |
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Topology | Boost | |
Peak Efficiency | 76 % | |
Component count min. | 4 | |
DC dimming | ![]() |
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PWM dimming | ![]() |
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PWM frequency min. | 0.10 kHz | |
PWM frequency max. | 10.0 kHz | |
digital dimming | ![]() |
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digital interface | ![]() |
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LED flash | ![]() |
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TxMask | ![]() |
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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 inventory, samples and price


Available Distributors with stock: 0
no online Distributor with LT3491 stock available
Available Distributors with stock: 0
no online Distributor with LT3491 stock available
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 | ![]() |
Intersil | TDFN-8 | |
0% | LT3591 | ![]() |
Linear Technology | DFN-8 | |
10% | LT3465 | ![]() |
Linear Technology | TSOT23-6 | |
10% | LT3465A | ![]() |
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 |