LT3755-1 Buck (multi-topology) LED driver IC overview

Description

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LT3755-1 is a non-sync DC/DC Buck (multi-topology) LED driver IC from . Maximum input voltage is 40.0 V and it drives an output current of up to 1.40 A. Assuming a typical 3.5V LED forward voltage LT3755-1 can drive up to 10 LED in series.

The LED Buck (multi-topology) driver IC features adjustable 1000 kHz switching frequency, a feedback voltage of 1.25 V and requires a typical inductor size of 22.0 uH. This combination results in a peak efficiency of ~97 %. LT3755-1 comes in 2 package option(s) - QFN-16 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 1
V-IN min. 4.5 V
V-IN max. 40.0 V
Nr.of LEDs max. 10
I-OUT? 1.40 A
MOSFET extern
ext.clock sync. yes
sync/non-sync non-sync
Frequency typ. 1000 kHz
Frequency adjustable adjustable
Frequency min. 100 kHz
Frequency max. 1000 kHz
Softstart yes
Softstart adjustable yes
Quiescent current max. 1700 uA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 150 °C
thermal shutdown typ.
Inductor size 22.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 1.25 V
Automotive AEC-Q100 no
Topology Buck (multi-topology)
Peak Efficiency 97 %
Component count min. 24
DC Dimming yes
PWM Dimming yes
digital dimming no
Nr. of package options 2
SC70
SOT
MSOP
QFN/DFN QFN-16
SO/SOIC
SOP
DIP
TO
Variation
LED temperature compensation no

LT3755-1 Datasheet

Link to the most up-to-date LT3755-1 datasheet and the product page for EVM, tools and support information.

LT3755-1

LT3755-1 inventory, samples and price

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Arrow Electronics

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Digi-Key

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LT3755EMSE-2#TRPBF 2500
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2502.93 €
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LT3755IUD-1#PBF 256
1003.74 €
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1003.86 €
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1003.26 €
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Verical

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LT3755EUD#PBF 483
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RS Components

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Farnell element14

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Richardson RFPD

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Equivalents and alternatives

The following DC/DC LED Buck (multi-topology) driver are similar to LT3755-1. Optional, compare LT3755-1 side-by-side with other LED driver via the Comparison function.

Variation Compare Product Manufacturer Package
25% LT3756-1 LT3756-1 product overviewLT3756-1 product overview Linear Technology MSOP-16, QFN-16
25% BD8381 BD8381 product overviewBD8381 product overview Rohm HTSSOP-28

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3755-1.

V-IN min. 4.5 V, V-IN max. 40 V, I-OUT 1.4 A, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74404042068 6.8 1.5 1.8 98.00 4 x 4 x 1.8
74404052056 5.6 2.1 2.6 67.50 5 x 5 x 2
74404052068 6.8 1.9 2.4 82.70 5 x 5 x 2
74404052075 7.5 1.7 2.1 96.80 5 x 5 x 2
74404054068 6.8 2.5 3.2 43.00 5 x 5 x 4
74404063068 6.8 2.4 2.8 47.00 6 x 6 x 2.8
74404063082 8.2 2.3 2.5 55.00 6 x 6 x 2.8
744053005 5.3 2.3 1.9 30.00 5.8 x 5.8 x 3
744053006 6.2 2.2 1.7 40.00 5.8 x 5.8 x 3
744062006 6.2 1.9 1.8 40.00 6.8 x 6.8 x 2.5
7440650082 8.2 3.8 2.8 28.50 10 x 10 x 3.1
7440700056 5.6 2.6 2.0 47.00 8 x 8 x 2
7440700068 6.8 2.4 1.8 56.00 8 x 8 x 2
7440700082 8.2 2.2 1.7 70.50 8 x 8 x 2
74408942068 6.8 1.5 2.4 110.00 4.8 x 4.8 x 3.1
74408942082 8.2 1.4 2.2 113.00 4.8 x 4.8 x 3.1
74408943068 6.8 2.0 2.7 51.00 4.8 x 4.8 x 4.1
74408943082 8.2 1.8 2.2 70.00 4.8 x 4.8 x 4.1
74437321056 5.6 1.6 2.7 180.00 4.45 x 4.06 x 1.2
74437324082 8.2 1.6 2.8 158.00 4.45 x 4.06 x 2
74438336068 6.8 1.6 2.9 168.00 3 x 3 x 2
7447462068 6.8 3.3 3.0 27.00 5.5 x 5.5 x 8.5
744773056 5.6 1.6 2.4 69.00 4 x 4.5 x 3.5
744773068 6.8 1.5 2.1 76.00 4 x 4.5 x 3.5
744773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
7447779006 6.8 2.9 3.3 33.00 7.3 x 7.3 x 4.5
7447779008 8.2 2.7 3.0 47.00 7.3 x 7.3 x 4.5
7447785006 6.8 2.3 2.0 79.00 5.9 x 6.2 x 3.3
7447786006 6.8 2.5 2.3 62.00 5.9 x 6.2 x 5.1
7447786008 8.2 2.3 2.1 66.00 5.9 x 6.2 x 5.1
7447789006 6.8 2.5 2.8 41.50 7.3 x 7.3 x 3.5
744779068 6.8 2.2 2.8 27.00 6 x 6 x 6.5
744787068 6.8 3.0 3.0 27.00 7.8 x 7 x 5
744787082 8.2 2.7 2.8 33.00 7.8 x 7 x 5
784773056 5.6 1.6 2.4 69.00 4 x 4.5 x 3.5
784773068 6.8 1.5 2.1 76.00 4 x 4.5 x 3.5
784773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
784775082 8.2 3.2 3.2 24.00 7 x 7.8 x 5.5
784777068 6.8 2.2 3.2 83.00 7.3 x 7.3 x 4.3
784777082 8.2 2.0 2.8 97.50 7.3 x 7.3 x 4.3
784778068 6.8 2.3 2.5 79.00 7.3 x 7.3 x 3.5
784778082 8.2 2.2 2.4 86.00 7.3 x 7.3 x 3.5
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