LTC3453 Synchronous Buck-Boost High Power White LED Driver

The LTC®3453 is a synchronous buck-boost DC/DC converter optimized for driving up to 4 white LEDs at a combined current of up to 500mA from a single Li-Ion battery input. The regulator operates in either synchronous buck, synchronous boost, or buck-boost mode, depending on input voltage and LED maximum forward voltage. Optimum efficiency is achieved using a proprietary architecture that determines which LED requires the largest forward voltage drop at its programmed current, and regulates the common output rail for lowest dropout. Efficiency of 90% can be achieved over the entire usable range of a Li-Ion battery (2.7V to 4.2V).

LED current is programmable to one of four levels (including shutdown) with dual current setting resistors and dual enable pins. In shutdown, the supply current is only 6µA.

A high constant operating frequency of 1MHz allows the use of a small external inductor. The LTC3453 is offered in a low profile (0.75mm) thermally enhanced 16-lead (4mm x 4mm) QFN package

产品特点 Features

High Efficiency: 90% Typical Over Entire Li-Ion Battery Range
Wide VIN Range: 2.7V to 5.5V
Up to 500mA Continuous Output Current
Internal Soft-Start
Open/Shorted LED Protection
LED Current Matching Typically <2%
Constant Frequency 1MHz Operation
Low Shutdown Current: 6µA
Overtemperature Protection
Small Thermally Enhanced 16-Lead (4mm x 4mm) QFN Package

参数

应用

Cell Phones
Digital Cameras
PDAs
Portable Devices

典型应用图

LTC3453 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC3453EUF	QFN	16	E	$2.64	$1.85
LTC3453EUF#PBF	QFN	16	E	$2.64	$1.85
LTC3453EUF#TR	QFN	16	E		$1.91
LTC3453EUF#TRPBF	QFN	16	E		$1.91

LTC3453 数据手册及相关资料下载

数据手册(英文) : LTC3453 - Synchronous Buck-Boost High Power White LED Driver.PDF
设计要点 (中文) : DN490 - 离线式 LED 照明得以简化：高功率因素、隔离型 LED 驱动器无需光隔合器并可兼容 TRIAC 调光器.PDF
可靠性数据 : R415 Reliability Data .PDF