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RT4531 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT4531 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 14 page  RT4531 ® DS4531-01 July 2016 www.richtek.com 1 © Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Ordering Information Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Simplified Application Circuit Applications Smart Phones Probable Instruments Backlight for Small and Media Form Factor LCD Display with Single-cell Battery Input Dual Channel 10s2p WLED Drivers General Description 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. Features Input Voltage Range : 2.5V to 5.5V Internal Soft-Start, UVLO, OTP, OCP, OVP Typical Shutdown Current : < 1 μμμμμA 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% ( > 5mA) LED Current Matching ±±±±± 2% ( > 5mA) Built-in IFB1/IFB2 pin OVP, Short Protection, and Un-Use Detection RT4531 Package Type WSC : WL-CSP-9B 1.35x1.35 (BSC) SW ISET GND RT4531 VIN EN L VIN IFB1 C3 Enable C2 R2 2P10S WLEDs IFB2 PWM AGND R1 C1 PWM Dimming |
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