EVB_RT4531WSC: 2 Channel @ 20mA, 2.5 ~ 5.5V in


The RT4531 is a dual-channel current source with high efficiency asynchronous boost converter for backlight application. The RT4531 has built-in 1.5A/36V power MOSFET and two high current-matching capability current sink, so RT4531 can drives up 10 series x 2 parallel white LEDs. The RT4531 can allow very low voltage headroom control, therefore to improve LED strings efficiency effectively. The RT4531 supports both PWM dimming and 1-wire digital dimming interface and it can realize 10 bit brightness code programming.

The RT4531 provides complete protection functions such as input Under-Voltage Lockout (UVLO), Over-Current Protection (OCP), Output over Voltage (OVP) and Over Temperature Protection (OTP).The RT4531 optimizes the feedback regulation voltage to provide high efficiency and also high current matching, within +/-2%


Manufacturer Richtek USA Inc.
Category Lighting
Sub-Category LED Drivers - DC In
Eval Board Part Number EVB_RT4531WSC-ND
Eval Board Supplier Richtek USA Inc.
Eval Board Normally In Stock
Voltage In 2.5 ~ 5.5 V
Topology Step Up
Current Out 20 mA
Voltage Out (Max) 36 V
Outputs and Type 2 Non-Isolated
Efficiency @ Conditions >80%, 3.6 Vin, 31 V @ 10 ~ 20 mA (10s2p)
Features 1-wire interface
Over Current Protection
Over Voltage Protection
PWM Interface
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 1 MHz
Component Count + Extras 31 + 0
Design Author Richtek USA Inc.
Application / Target Market Cellular Phone
Handheld games
LCD Backlighting
Main I.C. Base Part RT4531

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