LT3591 White LED Driver with Integrated Schottky in 3mm x 2mm DFN

The LT3591 is a fixed frequency step-up DC/DC converter speciﬁ cally designed to drive up to ten white LEDs in series 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. The device 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 one wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.

The high switching frequency allows the use of tiny inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. Few external components are needed: open-LED protection and the Schottky diode are all contained inside a low proﬁ le 3mm × 2mm DFN package

产品特点 Features

Drives Up to Ten White LEDs from a 3V Supply

High Side Sense Allows “One Wire Current Source”

Internal Schottky Diode

One Pin Dimming and Shutdown

80:1 True Color PWMTM Dimming Range

42V Open LED Protection

1MHz Switching Frequency

±5% Reference Accuracy

VIN Range: 2.5V to 12V

Requires Only 2.2µF Output Capacitor

Low Profile 8-Lead DFN Package

(3mm × 2mm × 0.75mm)

应用

Tape and Reel: Add #TR

Lead Free: Add #PBF

Lead Free Tape and Reel: Add #TRPBF

典型应用图

参数

LT3591 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) *
LT3591EDDB	DFN	8	E	$2.00
LT3591EDDB#PBF	DFN	8	E	$2.00
LT3591EDDB#TRMPBF	DFN	8	E	$2.00	$1.45
LT3591EDDB#TRPBF	DFN	8	E	$2.00	$1.40

LT3591 数据手册及相关资料下载

数据手册(英文) : LT3591 - White LED Driver with Integrated Schottky in 3mm x 2mm DFN.PDF
设计要点 (中文) : DN388 - 宽输入范围 1A LED 驱动器利用汽车和 12VAC 电源给高亮度 LED 供电.PDF
设计要点 (中文) : DN449 - 采用 4mm x 5mm QFN 封装的三通道 LED 驱动器能在降压、升压或降压-升压模式中支持 LCD 背光源并提供 3000:1 的 PWM 调光比.PDF
可靠性数据 : R518 Reliability Data .PDF