LTC3453 - LTC3453是Synchronous Buck-Boost High Power White LED Driver

LTC3453是LINEAR凌力尔特公司的一款降压-升压型 LED 驱动器产品，LTC3453是LTC3453是Synchronous Buck-Boost High Power White LED Driver，本站介绍了LTC3453的封装应用图解、特点和优点、功能等，并给出了与LTC3453相关的LINEAR元器件型号供参考。

LTC3453 - LTC3453是Synchronous Buck-Boost High Power White LED Driver - 降压-升压型 LED 驱动器 - 电源管理 - 凌力尔特

LTC3453 - Synchronous Buck-Boost High Power White LED Driver

LTC3453 - Synchronous Buck-Boost High Power White LED Driver - Linear Technology（凌力尔特）

功能描述

The LTC3453 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.

特点

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

应用