LT3745 Buck LED driver IC overview

Description

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LT3745 is a non-sync DC/DC Buck LED driver IC from . Maximum input voltage is 55.0 V and it drives an output current of up to 0.08 A. Assuming a typical 3.5V LED forward voltage LT3745 can drive up to 13 LED in series.

The LED Buck driver IC features adjustable 1000 kHz switching frequency, a feedback voltage of 0.47 V and requires a typical inductor size of 47.0 uH. This combination results in a peak efficiency of ~92 %. LT3745 comes in 1 package option(s) - QFN-40 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 16
V-IN min. 6.0 V
V-IN max. 55.0 V
Nr.of LEDs max. 13
I-OUT? 0.08 A
MOSFET extern
ext.clock sync. yes
sync/non-sync non-sync
Frequency typ. 1000 kHz
Frequency adjustable adjustable
Frequency min. 200 kHz
Frequency max. 1000 kHz
Softstart yes
Softstart adjustable yes
Quiescent current max. 3600 uA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ. 165.0 °C
Inductor size 47.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.47 V
Automotive AEC-Q100 no
Topology Buck
Peak Efficiency 92 %
Component count min. 15
DC Dimming no
PWM Dimming no
digital dimming yes
Nr. of package options 1
SC70
SOT
MSOP
QFN/DFN QFN-40
SO/SOIC
SOP
DIP
TO
Variation
LED temperature compensation no

LT3745 Datasheet

Link to the most up-to-date LT3745 datasheet and the product page for EVM, tools and support information.

LT3745

LT3745 inventory, samples and price

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Available Distributors with stock: 0

no online Distributor with LT3745 stock available

Available Distributors with stock: 3

Digi-Key

ProductStockPriceBuy
LT3745IUJ-1#PBF 61
257.82 €
111.78 €
Buy Now
DC1608A 8
1156.12 €
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LT3745EUJ#PBF 1
5005.45 €
2505.58 €
1005.87 €
257.10 €
110.70 €
Buy Now
LT3745EUJ-1#PBF 0
5005.45 €
2505.58 €
1005.87 €
257.10 €
110.70 €
Buy Now
LT3745IUJ#PBF 0
5006.01 €
2506.15 €
1006.47 €
257.82 €
111.78 €
Buy Now
LT3745EUJ#TRPBF 0
20005.52 €
Buy Now
LT3745EUJ-1#TRPBF 0
20005.52 €
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LT3745IUJ#TRPBF 0
20006.07 €
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LT3745IUJ-1#TRPBF 0
20006.07 €
Buy Now
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element14 Asia-Pacific

ProductStockPriceBuy
LT3745EUJ#PBF 12
5009.15 SGD
2509.36 SGD
1009.85 SGD
2511.91 SGD
117.94 SGD
Buy Now

Farnell element14

ProductStockPriceBuy
LT3745EUJ-1#PBF 11
103.69 GBP
14.45 GBP
Buy Now
LT3745EUJ#PBF 0
1004.66 GBP
255.11 GBP
18.61 GBP
Buy Now
show stock=0hide stock=0

Available Distributors without stock: 3

Arrow Electronics

ProductStockPriceBuy
LT3745EUJ-1#PBF 0
5005.81 $
2505.94 $
1006.01 $
617.56 $
Buy Now
LT3745EUJ#TRPBF 0
20006.11 $
Buy Now
LT3745EUJ#PBF 0
5005.81 $
2505.94 $
1006.01 $
617.56 $
Buy Now
LT3745IUJ#TRPBF 0
20006.72 $
Buy Now
LT3745IUJ#PBF 0
5006.40 $
2506.55 $
1006.62 $
618.33 $
Buy Now

Mouser Electronics

ProductStockPriceBuy
LT3745EUJ-1#PBF 0
111.97 $
257.95 $
1006.57 $
2506.24 $
5006.10 $
10005.87 $
Buy Now
LT3745EUJ#PBF 0
111.97 $
257.95 $
1006.57 $
2506.24 $
5006.10 $
10005.87 $
Buy Now
LT3745IUJ-1#PBF 0
113.19 $
258.76 $
1007.24 $
2506.88 $
5006.73 $
10006.47 $
Buy Now
LT3745IUJ#PBF 0
113.19 $
258.76 $
1007.24 $
2506.88 $
5006.73 $
10006.47 $
Buy Now
LT3745EUJ#TRPBF 0
20005.94 $
Buy Now
LT3745EUJ-1#TRPBF 0
20005.94 $
Buy Now
LT3745IUJ#TRPBF 0
20006.53 $
Buy Now
LT3745IUJ-1#TRPBF 0
20006.53 $
Buy Now

Richardson RFPD

ProductStockPriceBuy
LT3745EUJ-1#PBF 0
617.05 $
1006.66 $
5006.48 $
10006.30 $
50006.07 $
Buy Now
LT3745EUJ#PBF 0
617.05 $
1006.66 $
5006.48 $
10006.30 $
50006.07 $
Buy Now
LT3745EUJ#TRPBF 0
20006.39 $
50006.15 $
Buy Now
LT3745EUJ-1#TRPBF 0
20006.39 $
50006.15 $
Buy Now
LT3745IUJ#PBF 0
617.77 $
1007.33 $
5007.14 $
10006.96 $
50006.69 $
Buy Now
LT3745IUJ#TRPBF 0
20007.02 $
50006.75 $
Buy Now
LT3745IUJ-1#PBF 0
617.77 $
1007.33 $
5007.14 $
10006.96 $
50006.69 $
Buy Now
LT3745IUJ-1#TRPBF 0
20007.02 $
50006.75 $
Buy Now

Equivalents and alternatives

The following DC/DC LED Buck driver are similar to LT3745. Optional, compare LT3745 side-by-side with other LED driver via the Comparison function.

Variation Compare Product Manufacturer Package
0% LT3745-1 LT3745-1 product overviewLT3745-1 product overview Linear Technology QFN-40

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3745.

V-IN min. 6 V, V-IN max. 55 V, I-OUT 0.075 A, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744032221 220.0 0.1 0.2 9,440.00 3.2 x 2.5 x 2.3
744042221 220.0 0.2 0.2 2,880.00 4.8 x 4.8 x 2
744043151 150.0 0.4 0.2 770.00 4.8 x 4.8 x 3
744043221 220.0 0.3 0.2 1,008.00 4.8 x 4.8 x 3
744052221 220.0 0.2 0.3 2,400.00 5.8 x 5.8 x 2
744053221 220.0 0.3 0.3 1,170.00 5.8 x 5.8 x 3
744062221 220.0 0.4 0.3 1,010.00 6.8 x 6.8 x 2.5
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