LT3743 Buck LED driver IC overview

Description

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LED Buck

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

ParameterValueReplacement
Search Filter
Nr. of Channel 1
V-IN min. 6.0 V
V-IN max. 36.0 V
Nr.of LEDs max. 8
I-OUT? 20.00 A
MOSFET extern
ext.clock sync. yes
sync/non-sync sync
Frequency typ. 1000 kHz
Frequency adjustable adjustable
Frequency min. 200 kHz
Frequency max. 1000 kHz
Softstart yes
Softstart adjustable yes
Quiescent current max. 2500 uA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ. 163.0 °C
Inductor size 1.1 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.05 V
Automotive AEC-Q100 no
Topology Buck
Peak Efficiency 94 %
Component count min. 28
DC Dimming yes
PWM Dimming yes
digital dimming no
Nr. of package options 2
SC70
SOT
MSOP
QFN/DFN QFN-28
SO/SOIC
SOP TSSOP-28
DIP
TO
Variation
LED temperature compensation no

LT3743 Datasheet

Link to the most up-to-date LT3743 datasheet and the product page for EVM, tools and support information.

LT3743

LT3743 inventory, samples and price

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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 LT3744 product overviewLT3744 product overview Linear Technology QFN-36

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3743.

V-IN min. 6 V, V-IN max. 36 V, I-OUT 20 A, Frequency typ. 1000 kHz
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
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