LT3746 Buck LED driver IC overview

Description

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LT3746 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 0.03 A. Assuming a typical 3.5V LED forward voltage LT3746 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 22.0 uH. This combination results in a peak efficiency of ~92 %. LT3746 comes in 1 package option(s) - QFN-56 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 32
V-IN min. 6.0 V
V-IN max. 55.0 V
Nr.of LEDs max. 13
I-OUT? 0.03 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. 4000 uA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ. 165.0 °C
Inductor size 22.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.47 V
Automotive AEC-Q100 yes
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-56
SO/SOIC
SOP
DIP
TO
Variation
LED temperature compensation

LT3746 Datasheet

Link to the most up-to-date LT3746 datasheet and the product page for EVM, tools and support information.

LT3746

LT3746 inventory, samples and price

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Available Distributors with stock: 2

Chip One Stop (1)

ProductStockPriceBuy
LT3746EUHH#PBF185
110.10 USD
58.92 USD
107.22 USD
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Digi-Key (2)

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LT3746EUHH#PBF237
110.79 USD
257.21 USD
1006.13 USD
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LT3746IUHH#PBF117
111.87 USD
257.95 USD
1006.75 USD
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LT3746EUHH#TRPBF0
25006.23 USD
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LT3746IUHH#TRPBF0
25006.85 USD
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Available Distributors without stock: 1

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Available Distributors with stock: 4

Arrow Electronics

ProductStockPriceBuy
LT3746EUHH#PBF 185
1006.01 $
17.07 $
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Digi-Key

ProductStockPriceBuy
LT3746EUHH#PBF 237
1005.19 €
256.11 €
19.13 €
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LT3746IUHH#PBF 117
1005.72 €
256.73 €
110.05 €
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LT3746EUHH#TRPBF 0
25005.28 €
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LT3746IUHH#TRPBF 0
25005.80 €
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Verical

ProductStockPriceBuy
LT3746EUHH#PBF 185
1006.01 $
27.07 $
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Chip1Stop

ProductStockPriceBuy
LT3746EUHH#PBF 185
107.22 $
58.92 $
110.10 $
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Available Distributors without stock: 1

Mouser Electronics

ProductStockPriceBuy
LT3746EUHH#PBF 0
1206.13 $
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LT3746IUHH#PBF 0
1206.75 $
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LT3746EUHH#TRPBF 0
25006.23 $
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LT3746IUHH#TRPBF 0
25006.85 $
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Equivalents and alternatives

The following DC/DC LED Buck driver are similar to LT3746. Optional, compare LT3746 side-by-side with other LED driver via the Comparison function.

no alternatives found

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3746.

V-IN min. 6 V, V-IN max. 55 V, I-OUT 0.03 A, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
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