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MAX1848

MAX1848

白光LED升压型转换器，SOT23封装

电流调节升压转换器，用于白光LED供电，可保持一致亮度

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概述

说明

The MAX1848 drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. The step-up converter topology allows series connection of the white LEDs so that the LED currents are identical for uniform brightness. This configuration eliminates the need for ballast resistors and expensive factory calibration. Other benefits include greater simplicity, lower cost, higher efficiency, and greater reliability.

This step-up PWM converter includes an internal, high-voltage, low RDSON N-channel MOSFET switch for high efficiency and maximum battery life. A single analog voltage Dual Mode™ input provides a simple means of brightness adjustment and on/off control. Fast 1.2MHz current-mode PWM control allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup.

The MAX1848 is available in space-saving 8-pin thin QFN (3mm x 3mm) and 8-pin SOT23 packages.
MAX1848：典型应用电路 MAX1848：典型应用电路 放大+

关键特性

  • Constant Current Regulation for Uniform Illumination
  • High 87% Efficiency
  • Analog or Logic Control of LED Intensity
  • 0.8W Output Power with Internal High-Voltage MOSFET Switch
  • Small, Low-Profile External Components
  • 2.6V to 5.5V Input Range
  • 13V Maximum Output with Overvoltage Protection
  • Optimized for Low Input Ripple
  • Programmable Soft-Start
  • 0.3µA Shutdown Current
  • Small 8-pin Thin QFN (3mm x 3mm) and 8-Pin SOT23 Packages

应用

  • 蜂窝电话/智能电话
  • 电子书与亚笔记本电脑
  • PDA、掌上电脑与无线手持装置
  • 白色LED显示器背光

参数规格


Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

设计资源


MAX1848EVKIT: MAX1848评估板

技术资料

设计指南 4690 Important Design Considerations for Digital Thermometers
设计指南 4689 电子血压计的设计考虑
设计指南 4686 Important Design Considerations for Heart-Rate and Fitness Monitors
应用笔记 3624 Driving White LEDs in Clamshell Phones
应用笔记 3444 Light Is On When Power Is Out
应用笔记 3256 白色LED的恒流驱动
应用笔记 3070 标准和白光LED的基础知识与驱动
参考原理图 1804 Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently
应用笔记 1750 Powering Six White LEDs with High Efficiency Using the MAX1848
应用笔记 1736 Powering Four White LEDs with High Efficiency Using the MAX1848
应用笔记 1037 串联或并联白光LED的供电方案：电荷泵与升压型DC-DC转换器
应用笔记 940 Feedback Circuit Enhances Efficiency of Boost-Converter Current Source

质量与环境

产品可靠性报告: MAX1848.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

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技术文档

参考设计