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RT8532GQW Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8532GQW Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 14 page  RT8532 ® DS8532-04 January 2014 www.richtek.com 1 Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © 6-String 43V White LED Driver with Boost Regulator General Description The RT8532 is a high efficiency white LED driver. It is designed for LCD panel that employs a LED array as the lighting source. An integrated switch current mode Boost controller drives six strings in parallel and supports up to 10 pieces of LEDs per string. The internal current sinks support maximum ±2% current matching for excellent brightness uniformity in each LED string. To provide enough headroom for the operating of current sink, the Boost controller monitors the minimum voltage of feedback pins and regulates an optimized output voltage for power efficiency. The RT8532 has wide input voltage range from 2.5V to 24V and provides adjustable 5mA to 50mA LED current. The internal 200m Ω, 43V power switch with current-mode control provides cycle-by-cycle over current protection. The RT8532 also integrates PWM and analog dimming functions for accurate LED current control. The input PWM dimming frequency can be operated operate from 100Hz to 20kHz without any inrush current in LED. The RT8532 is available in WQFN-20L 3x3 package. Applications UMPC and Notebook Computer Backlight Features Wide Input Voltage : VIN 2.5V to 24V High Output Voltage : VOUT up to 43V Programmable Full Channel Current from 5mA to 50mA and Matched to 2% Channel Current Regulation with ±±±±±3% Accuracy Dimming Controls Direct PWM Dimming up to 20kHz and Minimum On-Time to 500ns PWM to Mixed Analog and PWM Dimming up to 20kHz with Maximum 9 bit Resolution Built-In Soft Start to Prevent Inrush Current without External Capacitor Disconnects LED in Shutdown Protection Strings Open Detection Current Limit Protection Programmable Over Voltage Protection Over Temperature Protection 20-Lead WQFN Package RoHS Compliant and Halogen Free Simplified Application Circuit OVP LED1 LED2 LED3 ISET VIN VOUT VIN LED4 COMP CIN L1 D1 AGND RT8532 ROVP1 ROVP2 : : : : : : : : : : : : COUT LX RCOMP CCOMP RISET PGND PWM : : : : : : LED5 LED6 PWM Signal EN Chip Enable CC RFSW FREQ MIX MIX COVP |
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