LED Drivers


As a leading power management IC specialist, Richtek provides complete product lines for LED light fixtures including AC/DC non-isolated, AC/DC isolated, MR16, DC/DC and Linear solution. We also provide different kinds of white LED Drivers.

With high efficiency, excellent current regulation, high power factor, low THD with low BOM cost, Richtek can always help designers to develop a cost-effective LED driver board for this cost sensitive market.

Product Line

The following is a list of products released in the last

Part NumberDescriptionShareDatasheetFree Sample
RT85436-String 43V White LED Driver with Boost Regulator Not available
RT4527A36V High Efficiency Boost Converter with I2C Controlled 6-CH LED Driver Not available
RT453736V High Efficiency Boost Converter with I2C Controlled 6-CH LED Driver Not available
RT454036V High Efficiency Boost Converter with I2C Controlled 6-CH LED Driver Not available
RT45051.5A Flash LED Driver with High-Side Current Source Not available
RT4526Small Package, High Performance, Asynchronous BoostLED Driver Not available
RT8532A6-String 43V White LED Driver with Boost Regulator Not available

Technical Document Image Preview
Basic LED Driver

LED Drivers

LED Drivers will regulate for constant output current instead of constant output voltage, because LEDs need to be driven with certain current for specific light output. Most high brightness LEDs have a forward voltage between 3 ~ 3.5V. Depending on the input voltage and the number of LEDs used in the LED string, the converter can be a buck, boost or buck-boost (for example when the application needs to cater for different LED strings).

When driving high numbers of LEDs like in LCD backlighting systems, multi-string LED drivers are used. In some off- line LED drivers, linear topology is used. Most LED drivers will also include dimming functions, to be able to control the output current, thereby controlling the LED light output.

Key parameters for selecting LED drivers are input voltage, LED string voltage and LED string current, single/multi-string LEDs and dimming.

In LED drivers powered from the AC line, it is also important to know whether the application needs to be isolated or non-isolated, and whether the LED driver needs to fulfill power factor and THD requirements.

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Technical Documents
TitleLast UpdateShareDownload
Designing Applications with Lithium-Ion Batteries2020/11/24
LED Backlight System and Power Solutions2020/11/24
Richtek Selection Guide [Oct., 2020]2020/11/18
Power Mangement Components for Lithium-Ion Battery Powered Applications2018/11/15
Automotive Product Selection Guide2018/11/15
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2018/11/15
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Programmable Dual LDO Output Voltage and WLED Current with I2C Interface2017/06/08
Evaluation Boards
TitleLast UpdateShareDownload
RT8555WSC Evaluation Board2018/11/08
Asynchronous Boost Converter for 10 WLEDs2018/11/08
RT4532 Evaluation Board2018/11/08
RT4531 Evaluation Board2018/11/08
Additional Documents
Title Last Update ShareDownload
Two-Stage MR16/AR111 LED Driver Solutions with Excellent Transformer Compatibility - RT8476, RT8479 2019/03/04