RT8475 Buck (multi-topology) LED driver IC overview

Description

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RT8475 is a non-sync DC/DC Buck (multi-topology) LED driver IC from . Maximum input voltage is 36.0 V and it drives an output current of up to 0.42 A. Assuming a typical 3.5V LED forward voltage RT8475 can drive up to 8 LED in series.

The LED Buck (multi-topology) driver IC features adjustable 1000 kHz switching frequency, a feedback voltage of 0.19 V and requires a typical inductor size of 22.0 uH. This combination results in a peak efficiency of ~94 %. RT8475 comes in 2 package option(s) - WQFN-16 SOP-14 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 1
V-IN min. 4.5 V
V-IN max. 36.0 V
Nr.of LEDs max. 8
I-OUT? 0.42 A
MOSFET extern
ext.clock sync. no
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. 7200 uA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ. 145.0 °C
Inductor size 22.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.19 V
Automotive AEC-Q100 no
Topology Buck (multi-topology)
Peak Efficiency 94 %
Component count min. 13
DC Dimming yes
PWM Dimming yes
digital dimming no
Nr. of package options 2
SC70
SOT
MSOP
QFN/DFN WQFN-16
SO/SOIC
SOP SOP-14
DIP
TO
Variation
LED temperature compensation no

RT8475 Datasheet

Link to the most up-to-date RT8475 datasheet and the product page for EVM, tools and support information.

RT8475

RT8475 inventory, samples and price

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Equivalents and alternatives

The following DC/DC LED Buck (multi-topology) driver are similar to RT8475. Optional, compare RT8475 side-by-side with other LED driver via the Comparison function.

Variation Compare Product Manufacturer Package
0% MP4600 MP4600 product overviewMP4600 product overview MPS QFN-10
0% RT8462 RT8462 product overviewRT8462 product overview Richtek WQFN-16, SOP-14
50% MP4601 MP4601 product overviewMP4601 product overview MPS SOIC-16, TSSOP-16
50% MP4603 MP4603 product overviewMP4603 product overview MPS SOIC-16, TSSOP-16

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of RT8475.

V-IN min. 4.5 V, V-IN max. 36 V, I-OUT 0.42 A, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744025220 22.0 0.5 0.8 525.00 2.8 x 2.8 x 3
744025270 27.0 0.5 0.7 745.00 2.8 x 2.8 x 3
74404024180 18.0 0.5 0.7 830.00 2.5 x 2 x 1.2
74404024220 22.0 0.5 0.6 910.00 2.5 x 2 x 1.2
74404032220 22.0 0.6 0.6 450.00 3 x 3 x 1.5
74404042220 22.0 0.7 1.1 290.00 4 x 4 x 1.8
744042180 18.0 0.9 0.7 270.00 4.8 x 4.8 x 2
744042220 22.0 0.9 0.6 280.00 4.8 x 4.8 x 2
744043180 18.0 1.0 0.7 150.00 4.8 x 4.8 x 3
744043220 22.0 0.9 0.7 160.00 4.8 x 4.8 x 3
744043270 27.0 0.9 0.6 170.00 4.8 x 4.8 x 3
744045180 18.0 0.7 1.1 480.00 4.5 x 3.2 x 2.9
744045220 22.0 0.6 1.0 560.00 4.5 x 3.2 x 2.9
744052180 18.0 0.9 1.0 185.00 5.8 x 5.8 x 2
744052220 22.0 0.8 0.9 240.00 5.8 x 5.8 x 2
744052270 27.0 0.8 0.8 250.00 5.8 x 5.8 x 2
744053180 18.0 1.3 1.1 90.00 5.8 x 5.8 x 3
744053220 22.0 1.2 0.9 100.00 5.8 x 5.8 x 3
744053270 27.0 1.1 0.8 135.00 5.8 x 5.8 x 3
744062180 18.0 1.3 1.0 90.00 6.8 x 6.8 x 2.5
744062220 22.0 1.2 1.0 100.00 6.8 x 6.8 x 2.5
7440680180 18.0 0.9 0.8 302.00 8 x 8 x 1.2
7440680220 22.0 0.9 0.7 350.00 8 x 8 x 1.2
7440690180 18.0 1.1 1.1 225.00 8 x 8 x 1.5
7440690220 22.0 1.0 0.9 272.00 8 x 8 x 1.5
7440700180 18.0 1.5 1.1 135.00 8 x 8 x 2
7440700220 22.0 1.3 1.0 166.00 8 x 8 x 2
74408941220 22.0 0.7 1.1 549.00 4.8 x 4.8 x 2.1
744773127 27.0 0.9 1.0 328.00 4 x 4.5 x 3.5
7447785122 22.0 1.4 1.1 210.00 5.9 x 6.2 x 3.3
784773127 27.0 0.9 1.0 328.00 4 x 4.5 x 3.5
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