RT8477A Buck (multi-topology) LED driver IC overview
Description
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
| Parameter | Value | Replacement 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. |  |
|
| sync/non-sync | non-sync | |
| Frequency typ. | 380 kHz | |
| Frequency adjustable | fixed | |
| Frequency min. | ||
| Frequency max. | ||
| Softstart |  |
|
| Softstart adjustable | |
|
| 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 | |
|
| Topology | Buck (multi-topology) | |
| Peak Efficiency | 96 % | |
| Component count min. | 16 | |
| DC Dimming | |
|
| PWM Dimming | |
|
| digital dimming | |
|
| Nr. of package options | 1 | |
| SC70 | ||
| SOT | ||
| MSOP | ||
| QFN/DFN | ||
| SO/SOIC | ||
| SOP | SOP-8 | |
| DIP | ||
| TO | ||
| Variation | ||
| LED temperature compensation | |
RT8477A Datasheet
Link to the most up-to-date RT8477A datasheet and the product page for EVM, tools and support information.
RT8477A inventory, samples and price
Available Distributors with stock: 0
Available Distributors with stock: 0
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 overview |
MPS | TSOT23-6 | |
| 0% | RT8477 | RT8477 product overview |
Richtek | SOP-8 | |
| 10% | RT8482 | RT8482 product overview |
Richtek | WQFN-16, SOP-16 | |
| 25% | RT8452 | RT8452 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.
| Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
