LT3497 - LT3497是Dual Full Function White LED Driver with Integrated Schottky Diodes

LT3497是LINEAR凌力尔特公司的一款升压型 LED 驱动器产品，LT3497是LT3497是Dual Full Function White LED Driver with Integrated Schottky Diodes，本站介绍了LT3497的封装应用图解、特点和优点、功能等，并给出了与LT3497相关的LINEAR元器件型号供参考。

LT3497 - LT3497是Dual Full Function White LED Driver with Integrated Schottky Diodes - 升压型 LED 驱动器 - 电源管理 - 凌力尔特

LT3497 - Dual Full Function White LED Driver with Integrated Schottky Diodes

LT3497 - Dual Full Function White LED Driver with Integrated Schottky Diodes - Linear Technology（凌力尔特）

功能描述

The LT3497 is a dual full function step-up DC/DC converter speci? cally designed to drive up to 12 white LEDs (6 white LEDs in series per converter) from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors and expensive factory calibration.

The two independent converters are capable of driving asymmetric LED strings. Accurate LED dimming and shutdown of the two LED strings can also be controlled independently. The LT3497 features a unique high side LED current sense that enables the part to function as a “one wire current source;” one side of the LED string can be returned to ground anywhere, allowing a simpler 1-wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.

The 2.3MHz switching frequency allows the use of tiny inductors and capacitors. Few external components are needed for the dual white LED Driver: open-LED protection and the Schottky diodes are all contained inside the 3mm × 2mm DFN package. With such a high level of integration, the LT3497 provides a high efficiency dual white LED driver solution in the smallest of spaces.

特点

Drives Up to 12 White LEDs (6 in Series per Converter) from a 3V Supply

Two Independent Boost Converters Capable of Driving Asymmetric LED Strings

Independent Dimming and Shutdown Control of the Two LED Strings

High Side Sense Allows “One Wire Current Source” per Converter

Internal Schottky Diodes

Open LED Protection (32V)

2.3MHz Switching Frequency

±5% Reference Accuracy

VIN Range: 2.5V to 10V

Dual Wide 250:1 True Color PWMTM Dimming

Requires Only 1µF Output Capacitor per Converter