RT8450 Buck (multi-topology) LED driver IC overview
Description
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RT8450 is a non-sync DC/DC Buck (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 RT8450 can drive up to 9 LED in series.
The LED Buck (multi-topology) driver IC features fixed 800 kHz switching frequency, a feedback voltage of 0.19 V and requires a typical inductor size of 20.0 uH. This combination results in a peak efficiency of ~94 %. RT8450 comes in 2 package option(s) - WDFN-12 TSSOP-16 .
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. |  |
|
| sync/non-sync | non-sync | |
| Frequency typ. | 800 kHz | |
| Frequency adjustable | fixed | |
| Frequency min. | ||
| Frequency max. | ||
| Softstart |  |
|
| Softstart adjustable | |
|
| Quiescent current max. | 6000 uA | |
| Operating min. | -40 °C | |
| Operating max. | 85 °C | |
| Junction min. | -40 °C | |
| Junction max. | 125 °C | |
| thermal shutdown typ. | ||
| Inductor size | 20.0 uH | |
| Inductor suggested by Würth Elektronik | ||
| Feedback Voltage | 0.19 V | |
| Automotive AEC-Q100 | |
|
| Topology | Buck (multi-topology) | |
| Peak Efficiency | 94 % | |
| Component count min. | 9 | |
| DC Dimming | |
|
| PWM Dimming | |
|
| digital dimming | |
|
| Nr. of package options | 2 | |
| SC70 | ||
| SOT | ||
| MSOP | ||
| QFN/DFN | WDFN-12 | |
| SO/SOIC | ||
| SOP | TSSOP-16 | |
| DIP | ||
| TO | ||
| Variation | ||
| LED temperature compensation |
RT8450 Datasheet
Link to the most up-to-date RT8450 datasheet and the product page for EVM, tools and support information.
RT8450 inventory, samples and price
Available Distributors with stock: 0
no online Distributor with RT8450 stock available
Available Distributors with stock: 0
no online Distributor with RT8450 stock available
Equivalents and alternatives
The following DC/DC LED Buck (multi-topology) driver are similar to RT8450. Optional, compare RT8450 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 RT8450.
V-IN min. 4.5 V, V-IN max. 40 V, I-OUT 1.5 A, Frequency typ. 800 kHz
| Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
| 74404052068 | 6.8 | 1.9 | 2.4 | 82.70 | 5 x 5 x 2 | |
| 74404052075 | 7.5 | 1.7 | 2.1 | 96.80 | 5 x 5 x 2 | |
| 74404052100 | 10.0 | 1.6 | 2.0 | 109.00 | 5 x 5 x 2 | |
| 74404054068 | 6.8 | 2.5 | 3.2 | 43.00 | 5 x 5 x 4 | |
| 74404054100 | 10.0 | 2.1 | 2.5 | 64.00 | 5 x 5 x 4 | |
| 74404063068 | 6.8 | 2.4 | 2.8 | 47.00 | 6 x 6 x 2.8 | |
| 74404063082 | 8.2 | 2.3 | 2.5 | 55.00 | 6 x 6 x 2.8 | |
| 74404063100 | 10.0 | 2.0 | 2.2 | 72.00 | 6 x 6 x 2.8 | |
| 74404064100 | 10.0 | 2.5 | 3.5 | 48.00 | 6 x 6 x 4.5 | |
| 744062006 | 6.2 | 1.9 | 1.8 | 40.00 | 6.8 x 6.8 x 2.5 | |
| 7440650068 | 6.8 | 4.2 | 3.6 | 25.00 | 10 x 10 x 3.1 | |
| 7440650082 | 8.2 | 3.8 | 2.8 | 28.50 | 10 x 10 x 3.1 | |
| 744065100 | 10.0 | 3.0 | 2.5 | 40.00 | 10 x 10 x 3.1 | |
| 7440700068 | 6.8 | 2.4 | 1.8 | 56.00 | 8 x 8 x 2 | |
| 744071100 | 10.0 | 3.4 | 2.8 | 28.00 | 8 x 8 x 4.6 | |
| 74408943068 | 6.8 | 2.0 | 2.7 | 51.00 | 4.8 x 4.8 x 4.1 | |
| 74408943082 | 8.2 | 1.8 | 2.2 | 70.00 | 4.8 x 4.8 x 4.1 | |
| 74408943100 | 10.0 | 1.7 | 2.1 | 82.00 | 4.8 x 4.8 x 4.1 | |
| 74437324068 | 6.8 | 1.8 | 3.5 | 150.00 | 4.45 x 4.06 x 2 | |
| 74437324082 | 8.2 | 1.6 | 2.8 | 158.00 | 4.45 x 4.06 x 2 | |
| 74437324100 | 10.0 | 1.5 | 2.4 | 215.00 | 4.45 x 4.06 x 2 | |
| 74438336068 | 6.8 | 1.6 | 2.9 | 168.00 | 3 x 3 x 2 | |
| 7447462068 | 6.8 | 3.3 | 3.0 | 27.00 | 5.5 x 5.5 x 8.5 | |
| 7447462100 | 10.0 | 2.5 | 2.6 | 55.00 | 5.5 x 5.5 x 8.5 | |
| 744773068 | 6.8 | 1.5 | 2.1 | 76.00 | 4 x 4.5 x 3.5 | |
| 744773082 | 8.2 | 1.5 | 1.8 | 116.00 | 4 x 4.5 x 3.5 | |
| 74477510 | 10.0 | 2.3 | 3.0 | 40.00 | 7 x 7.8 x 5.5 | |
| 74477610 | 10.0 | 3.0 | 3.2 | 27.50 | 9 x 10 x 5.9 | |
| 74477710 | 10.0 | 2.0 | 2.6 | 45.00 | 7.3 x 7.3 x 4.5 | |
| 7447779006 | 6.8 | 2.9 | 3.3 | 33.00 | 7.3 x 7.3 x 4.5 | |
| 7447779008 | 8.2 | 2.7 | 3.0 | 47.00 | 7.3 x 7.3 x 4.5 | |
| 744777910 | 10.0 | 2.0 | 2.6 | 45.00 | 7.3 x 7.3 x 4.5 | |
| 74477810 | 10.0 | 1.8 | 2.2 | 68.00 | 7.3 x 7.3 x 3.4 | |
| 7447785006 | 6.8 | 2.3 | 2.0 | 79.00 | 5.9 x 6.2 x 3.3 | |
| 7447786006 | 6.8 | 2.5 | 2.3 | 62.00 | 5.9 x 6.2 x 5.1 | |
| 7447786008 | 8.2 | 2.3 | 2.1 | 66.00 | 5.9 x 6.2 x 5.1 | |
| 744778610 | 10.0 | 2.1 | 1.8 | 74.00 | 5.9 x 6.2 x 5.1 | |
| 7447789006 | 6.8 | 2.5 | 2.8 | 41.50 | 7.3 x 7.3 x 3.5 | |
| 744778910 | 10.0 | 1.8 | 2.2 | 64.00 | 7.3 x 7.3 x 3.5 | |
| 744779068 | 6.8 | 2.2 | 2.8 | 27.00 | 6 x 6 x 6.5 | |
| 744779100 | 10.0 | 1.9 | 2.1 | 38.60 | 6 x 6 x 6.5 | |
| 744787068 | 6.8 | 3.0 | 3.0 | 27.00 | 7.8 x 7 x 5 | |
| 744787082 | 8.2 | 2.7 | 2.8 | 33.00 | 7.8 x 7 x 5 | |
| 744787100 | 10.0 | 2.6 | 2.6 | 36.50 | 7.8 x 7 x 5 | |
| 784773068 | 6.8 | 1.5 | 2.1 | 76.00 | 4 x 4.5 x 3.5 | |
| 784773082 | 8.2 | 1.5 | 1.8 | 116.00 | 4 x 4.5 x 3.5 | |
| 78477410 | 10.0 | 2.2 | 2.5 | 78.00 | 5.2 x 5.8 x 4.85 | |
| 784775082 | 8.2 | 3.2 | 3.2 | 24.00 | 7 x 7.8 x 5.5 | |
| 78477510 | 10.0 | 2.3 | 3.0 | 40.00 | 7 x 7.8 x 5.5 | |
| 78477610 | 10.0 | 3.0 | 3.2 | 28.00 | 9 x 10 x 5.9 | |
| 784777068 | 6.8 | 2.2 | 3.2 | 83.00 | 7.3 x 7.3 x 4.3 | |
| 784777082 | 8.2 | 2.0 | 2.8 | 97.50 | 7.3 x 7.3 x 4.3 | |
| 784777100 | 10.0 | 1.9 | 2.6 | 105.00 | 7.3 x 7.3 x 4.3 | |
| 784778068 | 6.8 | 2.3 | 2.5 | 79.00 | 7.3 x 7.3 x 3.5 | |
| 784778082 | 8.2 | 2.2 | 2.4 | 86.00 | 7.3 x 7.3 x 3.5 | |
| 784778100 | 10.0 | 1.9 | 2.2 | 105.00 | 7.3 x 7.3 x 3.5 |
