RT4528 Buck LED driver IC overview



RT4528 is a non-sync DC/DC Buck LED driver IC from . Maximum input voltage is 50.0 V and it drives an output current of up to 3.00 A. Assuming a typical 3.5V LED forward voltage RT4528 can drive up to 12 LED in series.

The LED Buck driver IC features fixed 490 kHz switching frequency, a feedback voltage of 0.10 V and requires a typical inductor size of 47.0 uH. This combination results in a peak efficiency of ~95 %. RT4528 comes in 1 package option(s) - SOP-8 .

Parameter and feature overview

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Nr. of Channel 1
V-IN min. 4.5 V
V-IN max. 50.0 V
Nr.of LEDs max. 12
I-OUT? 3.00 A
MOSFET intern
ext.clock sync. no
sync/non-sync non-sync
Frequency typ. 490 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 47.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.10 V
Automotive AEC-Q100 no
Topology Buck
Peak Efficiency 95 %
Component count min. 9
DC Dimming yes
PWM Dimming yes
digital dimming no
Nr. of package options 1
LED temperature compensation no

RT4528 Datasheet

Link to the most up-to-date RT4528 datasheet and the product page for EVM, tools and support information.


RT4528 inventory, samples and price


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Equivalents and alternatives

The following DC/DC LED Buck driver are similar to RT4528. Optional, compare RT4528 side-by-side with other LED driver via the Comparison function.

Variation Compare Product Manufacturer Package
25% G2602 G2602 product overviewG2602 product overview GMT MSOP-10, TDFN-12
50% PAM2863 PAM2863 product overviewPAM2863 product overview Diodes PSOP-8
50% SP7600 SP7600 product overviewSP7600 product overview Exar SO-8
50% ILD6150 ILD6150 product overviewILD6150 product overview Infineon DSO-8
50% RT8450 RT8450 product overviewRT8450 product overview Richtek WDFN-12, TSSOP-16
50% RT8450B RT8450B product overviewRT8450B product overview Richtek WDFN-12, TSSOP-16
50% RT8463 RT8463 product overviewRT8463 product overview Richtek WDFN-12, TSSOP-14
50% RT8453B RT8453B product overviewRT8453B product overview Richtek SOP-8
50% RT8474 RT8474 product overviewRT8474 product overview Richtek SOP-8
50% RT8474A RT8474A product overviewRT8474A product overview Richtek SOP-8

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of RT4528.

V-IN min. 4.5 V, V-IN max. 50 V, I-OUT 3 A, Frequency typ. 490 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
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