RT8479B Buck-Boost (multi-topology) LED driver IC overview
Description
RT8479B is a non-sync DC/DC Buck-Boost (multi-topology) LED driver IC from . Maximum input voltage is 40.0 V and it drives an output current of up to 1.50 A. Assuming a typical 3.5V LED forward voltage RT8479B can drive up to 9 LED in series.
The LED Buck-Boost (multi-topology) driver IC features fixed 600 kHz switching frequency, a feedback voltage of 0.13 V and requires a typical inductor size of 68.0 uH. This combination results in a peak efficiency of ~88 %. RT8479B comes in 1 package option(s) - SOP-8 .
Parameter and feature overview
Parameter | Value | Replacement Search Filter |
Nr. of Channel | 1 | |
V-IN min. | 4.5 V | |
V-IN max. | 40.0 V | |
Nr.of LEDs max. | 9 | |
I-OUT? | 1.50 A | |
MOSFET | intern | |
ext.clock sync. | ![]() |
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sync/non-sync | non-sync | |
Frequency typ. | 600 kHz | |
Frequency adjustable | fixed | |
Frequency min. | ||
Frequency max. | ||
Softstart | ![]() |
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Softstart adjustable | ![]() |
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Quiescent current max. | -1500 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 | 68.0 uH | |
Inductor suggested by Würth Elektronik | ||
Feedback Voltage | 0.13 V | |
Automotive AEC-Q100 | ![]() |
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Topology | Buck-Boost (multi-topology) | |
Peak Efficiency | 88 % | |
Component count min. | 14 | |
DC Dimming | ![]() |
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PWM Dimming | ![]() |
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digital dimming | ![]() |
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Nr. of package options | 1 | |
SC70 | ||
SOT | ||
MSOP | ||
QFN/DFN | ||
SO/SOIC | ||
SOP | SOP-8 | |
DIP | ||
TO | ||
Variation | ||
LED temperature compensation | ![]() |
RT8479B Datasheet
Link to the most up-to-date RT8479B datasheet and the product page for EVM, tools and support information.
RT8479B inventory, samples and price


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Available Distributors without stock: 1
element14 Asia-Pacific
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RT8479BGSP | 0 |
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Equivalents and alternatives
The following DC/DC LED Buck-Boost (multi-topology) driver are similar to RT8479B. Optional, compare RT8479B side-by-side with other LED driver via the Comparison function.
Inductor suggestions
Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of RT8479B.
Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |