LT3744 Buck LED driver IC overview

Description

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LT3744 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 LT3744 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 4.7 uH. This combination results in a peak efficiency of ~94 %. LT3744 comes in 1 package option(s) - QFN-36 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 1
V-IN min. 3.3 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. 2600 uA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ. 163.0 °C
Inductor size 4.7 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.05 V
Automotive AEC-Q100 no
Topology Buck
Peak Efficiency 94 %
Component count min. 39
DC Dimming yes
PWM Dimming yes
digital dimming no
Nr. of package options 1
SC70
SOT
MSOP
QFN/DFN QFN-36
SO/SOIC
SOP
DIP
TO
Variation
LED temperature compensation

LT3744 Datasheet

Link to the most up-to-date LT3744 datasheet and the product page for EVM, tools and support information.

LT3744

LT3744 inventory, samples and price

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Available Distributors with stock: 0

no online Distributor with LT3744 stock available

Available Distributors with stock: 5

Arrow Electronics

ProductStockPriceBuy
LT3744IUHE#PBF 62
2506.10 $
1006.25 $
257.56 $
111.39 $
Buy Now
LT3744IUHE#PBF 0
5005.81 $
2505.94 $
1006.01 $
617.56 $
Buy Now
LT3744EUHE#PBF 0
2504.87 $
1224.98 $
Buy Now
LT3744EUHE#PBF 0
10004.45 $
5004.63 $
2504.73 $
1224.80 $
Buy Now
LT3744IUHE#TRPBF 0
25006.11 $
Buy Now
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Digi-Key

ProductStockPriceBuy
LT3744EUHE#PBF 1528
1004.64 €
255.61 €
18.45 €
Buy Now
LT3744IUHE#PBF 318
1005.81 €
257.03 €
110.59 €
Buy Now
DC2339A 7
1138.09 €
Buy Now
DC1930A 1
1177.88 €
Buy Now
LT3744EUHE#TRPBF 0
25004.41 €
Buy Now
LT3744IUHE#TRPBF 0
25005.50 €
Buy Now
show stock=0hide stock=0

Verical

ProductStockPriceBuy
LT3744IUHE#PBF 62
2506.10 $
1006.25 $
257.56 $
111.39 $
Buy Now
LT3744IUHE#PBF 39
106.34 $
Buy Now
LT3744EUHE#PBF 36
272.28 $
Buy Now

Newark element14

ProductStockPriceBuy
LT3744EUHE#PBF 36
11.87 $
101.87 $
251.87 $
501.87 $
1001.87 $
2501.87 $
5001.87 $
Buy Now
LT3744IUHE#PBF 39
15.20 $
105.20 $
255.20 $
505.20 $
1005.20 $
2505.20 $
5005.20 $
Buy Now

Mouser Electronics

ProductStockPriceBuy
LT3744EUHE#PBF 137
19.55 $
256.34 $
1005.24 $
2504.98 $
5004.87 $
10004.68 $
Buy Now

Available Distributors without stock: 2

Richardson RFPD

ProductStockPriceBuy
LT3744EUHE#PBF 0
1225.31 $
5005.17 $
10005.03 $
50004.85 $
Buy Now
LT3744IUHE#PBF 0
617.05 $
1006.66 $
5006.48 $
10006.30 $
50006.07 $
Buy Now
LT3744EUHE#TRPBF 0
25005.11 $
50004.92 $
Buy Now
LT3744IUHE#TRPBF 0
25006.39 $
50006.15 $
Buy Now

Farnell element14

ProductStockPriceBuy
LT3744EUHE#PBF 0
5003.78 GBP
2503.98 GBP
1004.19 GBP
504.39 GBP
255.28 GBP
105.38 GBP
15.49 GBP
Buy Now

Equivalents and alternatives

The following DC/DC LED Buck driver are similar to LT3744. Optional, compare LT3744 side-by-side with other LED driver via the Comparison function.

Variation Compare Product Manufacturer Package
0% LT3743 LT3743 product overviewLT3743 product overview Linear Technology QFN-28, TSSOP-28

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3744.

V-IN min. 3.3 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)
744301033 0.3 40.0 46.0 0.32 11.3 x 11 x 9.4
744301047 0.5 40.0 35.0 0.32 11.3 x 11 x 9.4
744305033 0.3 28.0 26.0 0.16 13.5 x 13.3 x 5.2
744306030 0.3 26.0 24.0 0.30 10.5 x 10.3 x 5.5
744308033 0.3 27.0 30.0 0.37 10.1 x 7 x 7
744308040 0.4 25.0 26.0 0.37 10.1 x 7 x 7
7443081030 0.3 38.0 32.0 0.29 9.4 x 6.2 x 8.1
744309047 0.5 47.5 40.5 0.17 14 x 13 x 9.5
744325040 0.4 24.0 37.0 0.67 10.5 x 10.2 x 5
7443320047 0.5 26.0 48.0 1.35 12.1 x 11.4 x 10
7443330047 0.5 20.5 47.0 1.60 10.9 x 10 x 9.7
7443340030 0.3 20.5 36.0 2.30 8.4 x 7.9 x 7.5
744355230 0.3 22.0 35.0 1.10 10.5 x 10.2 x 4.2
744373770033 0.3 24.0 35.0 0.88 13.5 x 12.6 x 3.5
74477009 0.5 23.5 26.4 2.90 12 x 12 x 8
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