EVB_RT8555WSC: 35mA @ 36V (Max) x 6 LED Channels, 2.7 ~ 24V in


The RT8555WSC Evaluation Board is a high efficiency driver for white LEDs. It is suitable for single/two cell battery input to drive LED light bars which contains six strings in parallel and up to 10 WLEDs per string. The internal current sinks support a maximum of ±2% current mismatching for excellent brightness uniformity in each string of LEDs. To provide enough headroom for current sink operation, the Boost controller monitors the minimum voltage of the feedback pins and regulates an optimized output voltage for power efficiency.

The RT8555 has a wide input voltage operating range from 2.7V to 24V and contains I2C interface for controlling the dimming mode, operating frequency and the LED current. The internal 100mΩ, 36V power switch with current-mode control provides over-current protection. The switching frequency of the RT8555 is adjustable from 300kHz to 2MHz, which allows flexibility between efficiency and component size. The RT8555 is available in the WL-CSP-20B 1.65 x 2.05 (BSC), with pitch 0.4mm package.


Manufacturer Richtek USA Inc.
Category Lighting
Sub-Category LED Drivers - DC In
Eval Board Part Number EVB_RT8555WSC-ND
Eval Board Supplier Richtek USA Inc.
Eval Board Normally In Stock
Voltage In 2.7 ~ 24 V
Topology Step Up
Current Out 35 mA
Voltage Out (Max) 36 V
Outputs and Type 6 Non-Isolated
Efficiency @ Conditions >90%, 54 LEDs @ 12 ~ 24V in
Features Current Limit (Adj. or Fixed)
Dimming Control
I²C Interface
Open Circuit Protection
Over Current Protection
Over Voltage Protection
PWM Interface
Shutdown, Enable, Standby
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 900 kHz
Component Count + Extras 19 + 34
Design Author Richtek USA Inc.
Application / Target Market LCD Backlighting
LCD TV / Monitor
Portable Devices
Main I.C. Base Part RT8555
Date Created By Author 2015-09
Date Added To Library 2019-07

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