Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

General Description The MAX8901A/MAX8901B step-up converters drive from two to six series-connected white LEDs (WLEDs) with constant current to provide uniform WLED intensity for LCD backlighting in cell phones, PDAs, and other handheld devices. The MAX8901_ operate at a fixed 750kHz (typ) switch

文件：298.58 Kbytes 页数：15 Pages

Maxim

美信

Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

General Description The MAX8901A/MAX8901B step-up converters drive from two to six series-connected white LEDs (WLEDs) with constant current to provide uniform WLED intensity for LCD backlighting in cell phones, PDAs, and other handheld devices. The MAX8901_ operate at a fixed 750kHz (typ) switch

文件：298.58 Kbytes 页数：15 Pages

Maxim

美信

Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

文件：303.04 Kbytes 页数：14 Pages

Maxim

美信

效率最高的2至6只串联WLED供电电源，2mm x 2mm TDFN封装

MAX8901A/MAX8901B升压转换器能够以固定电流驱动2至6只串联白光LED (WLED)，为手机、PDA和其它手持设备提供亮度均匀的WLED驱动，用于LCD背光。MAX8901_工作在750kHz (典型值)固定开关频率，允许采用小尺寸外部元件，经过优化处理能够在1节锂离子/锂聚合物电池的整个电压范围保持最高效率。\n\n 这两款转换器采用单个输入(ON)使能IC并控制WLED亮度。MAX8901A采用直接PWM输入调节LED亮度，LED电流正比于PWM占空比。MAX8901B采用单线、串行脉冲调光，提供32级线性调节的LED亮度。利用脉冲串调光时，满量程LED电流为24. • 效率高达91% \n• 2.6V至5.5V输入电压范围\n• 固定频率工作模式\n• 能够驱动2至6只串联WLED，1.3% LED电流精度\n• 灵活的调光控制\n• 直接PWM调光(MAX8901A)\n• 32级、单线串行调光(MAX8901B)\n\n\n• 输入欠压锁存\n• 输入过压锁存\n• WLED过压保护(25V典型值)\n• 0.01µA (典型值)关断电流\n• 关断模式下没有WLED电流\n• 内部软启动和热关断;

ADI

亚德诺

Package：8-WFDFN 裸露焊盘；包装：卷带（TR）剪切带（CT）Digi-Reel® 得捷定制卷带 类别：集成电路（IC） LED 驱动器 描述：IC LED DRVR RGLTR PWM 25MA 8TDFN

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亚德诺