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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 200mΩ, 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.

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

Applications

UMPC and Notebook Computer Backlight