LT3475 Buck LED driver IC overview

Description

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Category
Sub-Category

LT3475 is a non-sync DC/DC Buck LED driver IC from . Maximum input voltage is 36.0 V and it drives an output current of up to 1.50 A. Assuming a typical 3.5V LED forward voltage LT3475 can drive up to 10 LED in series.

The LED Buck driver IC features adjustable 600 kHz switching frequency, a feedback voltage of 1.25 V and requires a typical inductor size of 10.0 uH. This combination results in a peak efficiency of ~88 %. LT3475 comes in 1 package option(s) - TSSOP-20 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 2
V-IN min. 4.0 V
V-IN max. 36.0 V
Nr.of LEDs max. 10
I-OUT? 1.50 A
MOSFET intern
ext.clock sync. no
sync/non-sync non-sync
Frequency typ. 600 kHz
Frequency adjustable adjustable
Frequency min. 200 kHz
Frequency max. 2000 kHz
Softstart no
Softstart adjustable no
Quiescent current max. 8000 uA
Operating min. -40 °C
Operating max. 125 °C
Junction min.
Junction max. 125 °C
thermal shutdown typ.
Inductor size 10.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 1.25 V
Automotive AEC-Q100 no
Topology Buck
Peak Efficiency 88 %
Component count min. 14
DC Dimming no
PWM Dimming yes
digital dimming no
Nr. of package options 1
SC70
SOT
MSOP
QFN/DFN
SO/SOIC
SOP TSSOP-20
DIP
TO
Variation
LED temperature compensation no

LT3475 Datasheet

Link to the most up-to-date LT3475 datasheet and the product page for EVM, tools and support information.

LT3475

LT3475 inventory, samples and price

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Available Distributors with stock: 0

no online Distributor with LT3475 stock available

Available Distributors with stock: 4

Digi-Key

ProductStockPriceBuy
LT3475EFE#PBF 685
10363.90 €
5184.48 €
2964.91 €
1485.34 €
745.92 €
106.50 €
17.22 €
Buy Now
LT3475IFE-1#PBF 562
10364.67 €
5185.36 €
2965.88 €
1486.40 €
747.09 €
107.78 €
18.65 €
Buy Now
LT3475EFE-1#PBF 212
10363.90 €
5184.48 €
2964.91 €
1485.34 €
745.92 €
106.50 €
17.22 €
Buy Now
DC923A 3
2595.72 €
1099.19 €
1106.12 €
Buy Now
DC1315A 2
186.70 €
Buy Now
LT3475IFE#PBF 0
10364.67 €
5185.36 €
2965.88 €
1486.40 €
747.09 €
107.78 €
18.65 €
Buy Now
LT3475EFE#TRPBF 0
25003.81 €
Buy Now
LT3475EFE-1#TRPBF 0
25003.81 €
Buy Now
LT3475IFE#TRPBF 0
25004.56 €
Buy Now
LT3475IFE-1#TRPBF 0
25004.56 €
Buy Now
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Mouser Electronics

ProductStockPriceBuy
LT3475EFE#PBF 346
17.19 $
106.59 $
505.10 $
2504.32 $
Buy Now
LT3475EFE-1#PBF 220
17.19 $
106.59 $
505.10 $
2504.32 $
Buy Now
LT3475IFE-1#PBF 222
18.63 $
107.91 $
506.12 $
2505.18 $
Buy Now
LT3475IFE#PBF 0
18.63 $
107.91 $
506.12 $
2505.18 $
Buy Now
LT3475EFE#TRPBF 0
25005.17 $
Buy Now
LT3475EFE-1#TRPBF 0
25005.17 $
Buy Now
LT3475IFE#TRPBF 0
25006.17 $
Buy Now
LT3475IFE-1#TRPBF 0
25006.17 $
Buy Now
LT3475EFE 0 Buy Now
LT3475IFE 0 Buy Now
LT3475EFE#TR 0 Buy Now
LT3475IFE#TR 0 Buy Now
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Bristol Electronics

ProductStockPriceBuy
LT3475EFE#PBF 2 Buy Now

RS Components

ProductStockPriceBuy
LT3475EFE#PBF 2025
754.21 GBP
504.58 GBP
254.98 GBP
105.17 GBP
Buy Now

Available Distributors without stock: 1

Richardson RFPD

ProductStockPriceBuy
LT3475EFE#PBF 0
1485.00 $
5004.72 $
10004.59 $
50004.41 $
Buy Now
LT3475EFE#TRPBF 0
25004.66 $
50004.48 $
Buy Now
LT3475EFE-1#PBF 0
1485.00 $
5004.72 $
10004.59 $
50004.41 $
Buy Now
LT3475EFE-1#TRPBF 0
25004.66 $
50004.48 $
Buy Now
LT3475IFE#PBF 0
1485.99 $
5005.65 $
10005.50 $
50005.28 $
Buy Now
LT3475IFE#TRPBF 0
25005.58 $
50005.37 $
Buy Now
LT3475IFE-1#PBF 0
1485.99 $
5005.65 $
10005.50 $
50005.28 $
Buy Now
LT3475IFE-1#TRPBF 0
25005.58 $
50005.37 $
Buy Now

Equivalents and alternatives

The following DC/DC LED Buck driver are similar to LT3475. Optional, compare LT3475 side-by-side with other LED driver via the Comparison function.

Variation Compare Product Manufacturer Package
50% 88EM8801 88EM8801 product overview88EM8801 product overview Marvell QFN-28

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3475.

V-IN min. 4 V, V-IN max. 36 V, I-OUT 1.5 A, Frequency typ. 600 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74404052075 7.5 1.7 2.1 96.80 5 x 5 x 2
74404052100 10.0 1.6 2.0 109.00 5 x 5 x 2
74404054100 10.0 2.1 2.5 64.00 5 x 5 x 4
74404063082 8.2 2.3 2.5 55.00 6 x 6 x 2.8
74404063100 10.0 2.0 2.2 72.00 6 x 6 x 2.8
74404064100 10.0 2.5 3.5 48.00 6 x 6 x 4.5
74404064120 12.0 2.2 3.0 58.00 6 x 6 x 4.5
7440650082 8.2 3.8 2.8 28.50 10 x 10 x 3.1
744065100 10.0 3.0 2.5 40.00 10 x 10 x 3.1
744071100 10.0 3.4 2.8 28.00 8 x 8 x 4.6
74408943082 8.2 1.8 2.2 70.00 4.8 x 4.8 x 4.1
74408943100 10.0 1.7 2.1 82.00 4.8 x 4.8 x 4.1
74437324082 8.2 1.6 2.8 158.00 4.45 x 4.06 x 2
74437324100 10.0 1.5 2.4 215.00 4.45 x 4.06 x 2
7447462100 10.0 2.5 2.6 55.00 5.5 x 5.5 x 8.5
7447715120 12.0 3.5 3.6 30.00 12 x 12 x 4.5
744773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
74477510 10.0 2.3 3.0 40.00 7 x 7.8 x 5.5
744775112 12.0 2.2 2.2 41.70 7 x 7.8 x 5.5
74477610 10.0 3.0 3.2 27.50 9 x 10 x 5.9
744776112 12.0 2.7 3.2 32.60 9 x 10 x 5.9
74477710 10.0 2.0 2.6 45.00 7.3 x 7.3 x 4.5
744777112 12.0 1.8 2.4 54.00 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
744777910 10.0 2.0 2.6 45.00 7.3 x 7.3 x 4.5
7447779112 12.0 1.8 2.4 50.00 7.3 x 7.3 x 4.5
74477810 10.0 1.8 2.2 68.00 7.3 x 7.3 x 3.4
744778112 12.0 1.7 2.2 76.00 7.3 x 7.3 x 3.4
7447786008 8.2 2.3 2.1 66.00 5.9 x 6.2 x 5.1
744778610 10.0 2.1 1.8 74.00 5.9 x 6.2 x 5.1
744778910 10.0 1.8 2.2 64.00 7.3 x 7.3 x 3.5
7447789112 12.0 1.7 1.9 76.00 7.3 x 7.3 x 3.5
744779100 10.0 1.9 2.1 38.60 6 x 6 x 6.5
744787082 8.2 2.7 2.8 33.00 7.8 x 7 x 5
744787100 10.0 2.6 2.6 36.50 7.8 x 7 x 5
744787120 12.0 2.5 2.4 45.00 7.8 x 7 x 5
784773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
78477410 10.0 2.2 2.5 78.00 5.2 x 5.8 x 4.85
784774112 12.0 2.0 1.9 82.00 5.2 x 5.8 x 4.85
784775082 8.2 3.2 3.2 24.00 7 x 7.8 x 5.5
78477510 10.0 2.3 3.0 40.00 7 x 7.8 x 5.5
784775112 12.0 2.2 2.2 42.00 7 x 7.8 x 5.5
78477610 10.0 3.0 3.2 28.00 9 x 10 x 5.9
784776112 12.0 2.7 3.2 33.00 9 x 10 x 5.9
784777082 8.2 2.0 2.8 97.50 7.3 x 7.3 x 4.3
784777100 10.0 1.9 2.6 105.00 7.3 x 7.3 x 4.3
784778082 8.2 2.2 2.4 86.00 7.3 x 7.3 x 3.5
784778100 10.0 1.9 2.2 105.00 7.3 x 7.3 x 3.5
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