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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 10s2p white LED. 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 is available in the WL-CSP-9B 1.35x1.35 (BSC) package.
Input Voltage Range : 2.5V to 5.5V
Internal Soft-Start, UVLO, OTP, OCP, OVP
Typical Shutdown Current : < 1μA
1MHz Switching Frequency
Drives Up to 10 WLEDs in Two Strings
Independent PWM Dimming and 1-Wire Dimming Control
PWM Dimming Frequency from 20k to 100kHz
Up to 10 Bit Dimming Resolution
LED Current Accuracy ± 2% (IFBx = 20mA)
LED Current Matching ± 2% ( IFBx = 20mA)
Built-in IFB1/IFB2 pin OVP, Short Protection, and Un-Use Detection
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