LT3743 Buck LED driver IC overview
Description
LT3743 is a sync DC/DC Buck LED driver IC from . Maximum input voltage is 36.0 V and it drives an output current of up to 20.00 A. Assuming a typical 3.5V LED forward voltage LT3743 can drive up to 8 LED in series.
The LED Buck driver IC features adjustable 1000 kHz switching frequency, a feedback voltage of 0.05 V and requires a typical inductor size of 1.1 uH. This combination results in a peak efficiency of ~94 %. LT3743 comes in 2 package option(s) - QFN-28 TSSOP-28 .
Parameter and feature overview
LT3743 Datasheet
Link to the most up-to-date LT3743 datasheet and the product page for EVM, tools and support information.
LT3743 inventory, samples and price


Available Distributors with stock: 0
Available Distributors with stock: 0
Equivalents and alternatives
The following DC/DC LED Buck driver are similar to LT3743. Optional, compare LT3743 side-by-side with other LED driver via the Comparison function.
Variation | Compare | Product | Manufacturer | Package | |
0% | LT3744 | ![]() |
Linear Technology | QFN-36 |
Inductor suggestions
Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3743.
Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
744301047 | 0.5 | 40.0 | 35.0 | 0.32 | 11.3 x 11 x 9.4 | |
744309047 | 0.5 | 47.5 | 40.5 | 0.17 | 14 x 13 x 9.5 | |
744313068 | 0.7 | 22.0 | 40.0 | 1.58 | 12.9 x 12.8 x 3.5 | |
744325072 | 0.7 | 22.0 | 35.0 | 1.30 | 10.5 x 10.2 x 5 | |
7443320047 | 0.5 | 26.0 | 48.0 | 1.35 | 12.1 x 11.4 x 10 | |
7443320068 | 0.7 | 26.0 | 38.0 | 1.35 | 12.1 x 11.4 x 10 | |
7443320082 | 0.8 | 24.0 | 36.0 | 1.85 | 12.1 x 11.4 x 10 | |
7443330047 | 0.5 | 20.5 | 47.0 | 1.60 | 10.9 x 10 x 9.7 | |
7443330068 | 0.7 | 20.0 | 38.0 | 2.15 | 10.9 x 10 x 9.7 | |
7443330082 | 0.8 | 20.0 | 36.0 | 2.15 | 10.9 x 10 x 9.7 | |
744355047 | 0.5 | 26.0 | 50.0 | 0.90 | 13 x 12.8 x 5 | |
744355147 | 0.5 | 30.0 | 50.0 | 0.64 | 13.2 x 12.8 x 6.5 | |
744355182 | 0.8 | 27.0 | 35.0 | 1.04 | 13 x 12.8 x 6.5 | |
744355256 | 0.6 | 20.0 | 30.0 | 1.61 | 10.5 x 10.2 x 4.2 | |
74477009 | 0.5 | 23.5 | 26.4 | 2.90 | 12 x 12 x 8 |