RT8477A Buck (multi-topology) LED driver IC overview

Description

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RT8477A is a non-sync DC/DC Buck (multi-topology) LED driver IC from . Maximum input voltage is 50.0 V and it drives an output current of up to 2.00 A. Assuming a typical 3.5V LED forward voltage RT8477A can drive up to 12 LED in series.

The LED Buck (multi-topology) driver IC features fixed 380 kHz switching frequency, a feedback voltage of 0.10 V and requires a typical inductor size of 22.0 uH. This combination results in a peak efficiency of ~96 %. RT8477A comes in 1 package option(s) - SOP-8 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 1
V-IN min. 4.5 V
V-IN max. 50.0 V
Nr.of LEDs max. 12
I-OUT? 2.00 A
MOSFET extern
ext.clock sync. no
sync/non-sync non-sync
Frequency typ. 380 kHz
Frequency adjustable fixed
Frequency min.
Frequency max.
Softstart yes
Softstart adjustable no
Quiescent current max. 3000 uA
Operating min. -40 °C
Operating max. 85 °C
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ. 150.0 °C
Inductor size 22.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.10 V
Automotive AEC-Q100 no
Topology Buck (multi-topology)
Peak Efficiency 96 %
Component count min. 16
DC Dimming yes
PWM Dimming no
digital dimming no
Nr. of package options 1
SC70
SOT
MSOP
QFN/DFN
SO/SOIC
SOP SOP-8
DIP
TO
Variation
LED temperature compensation no

RT8477A Datasheet

Link to the most up-to-date RT8477A datasheet and the product page for EVM, tools and support information.

RT8477A

RT8477A inventory, samples and price

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Equivalents and alternatives

The following DC/DC LED Buck (multi-topology) driver are similar to RT8477A. Optional, compare RT8477A side-by-side with other LED driver via the Comparison function.

Variation Compare Product Manufacturer Package
0% MP24894 MP24894 product overviewMP24894 product overview MPS TSOT23-6
0% RT8477 RT8477 product overviewRT8477 product overview Richtek SOP-8
10% RT8482 RT8482 product overviewRT8482 product overview Richtek WQFN-16, SOP-16
25% RT8452 RT8452 product overviewRT8452 product overview Richtek WQFN-16, SOP-16

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of RT8477A.

V-IN min. 4.5 V, V-IN max. 50 V, I-OUT 2 A, Frequency typ. 380 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
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