EVB_RT4532WSC: 2.5 ~ 5.5V, 20mA/40mA @ 17V Max, 2 Isolated Outputs LED Driver

Summary

The RT4532 is a high-efficiency LED driver for backlight applications. An asynchronous boost converter with an internal Schottky diode and a current source driver are designed to support 6LED/channel with wide input voltage range from 2.5V to 5.5V.

This document explains the function and use of the RT4532 evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements.

Features:

Input Voltage Range : 2.5V to 5.5V
Internal Schottky Diode
Fast-speed mode I2C Compatible Interface
Drive Up to 6 WLEDs in 4 String
External PWM Brightness Control
550k/1.1MHz Switching Frequency
Built-in Internal Soft-Start
I2C Programmable 256 Steps Linear Current Regulation
Up to 85% Efficiency with Small Magnetics
Programmable 16V/24V OVP
Current Accuracy ±5% and Current Balance ±3%
UVLO, OVP, OCP, OTP Protection
Shutdown Current : < 1µA
Temperature Range : -40°C to 85°C

Specifications

Manufacturer	Richtek USA Inc.
Category	Lighting
Sub-Category	LED Drivers - DC In
Eval Board Part Number	EVB_RT4532WSC-ND
Eval Board Supplier	Richtek USA Inc.
Eval Board	Board not Stocked
Voltage In	2.5 ~ 5.5 V
Topology	Step Up
Current Out	20 mA/40 mA
Voltage Out (Max)	17 V
Outputs and Type	2 Isolated
Efficiency @ Conditions	>80%, 2.5 ~ 5.5V in, 18V @ 20 mA >88%, 3.5 ~ 5.5V in, 18V @ 20 mA
Features	I²C Interface Over Current Protection Over Voltage Protection Soft Start Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	1.1 MHz
Component Count + Extras	3 + 41
Design Author	Richtek USA Inc.
Application / Target Market	Cell Phones Digital Cameras Portable Devices
Main I.C. Base Part	RT4532
Date Created By Author	2015-08
Date Added To Library	2024-09