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MAX1848
电源管理 LED驱动器 MAX1848
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MAX1848

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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

可打印的数据手册 订阅

产品详情

请参见参数规范 LED Drivers

主要特征

请参见参数规范 LED Drivers
Parametric specs for LED Drivers
VIN (V) (min) 2.6
VIN (V) (max) 5.5
Max. No. of LEDs 6
# LED Channels 1
Regulation Topology Inductor Based
Battery Input 1-Cell Li+
LED Configuration Series
ILED per Channel (A) (max) 0.06
Dimming Ratio (max) 20
Dimming Control Analog
VCURR_SENSE (mV) 75
POUT (W) 0.8
ICC (mA) (max) 2
LED String Volt. (V) (max) 12
Switching Frequency (kHz) 1200
Package/Pins TDFN/8
Budgetary
Price (See Notes) 		1.47
请参见参数规范 LED Drivers
缩小

简化框图

Technical Docs

数据资料 白光LED升压型转换器，SOT23封装 Sep 15, 2005
应用笔记 Driving White LEDs in Clamshell Phones
应用笔记 Light Is On When Power Is Out
应用笔记 白色LED的恒流驱动
应用笔记 标准和白光LED的基础知识与驱动
应用笔记 Powering Six White LEDs with High Efficiency Using the MAX1848
应用笔记 Powering Four White LEDs with High Efficiency Using the MAX1848
应用笔记 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 Feedback Circuit Enhances Efficiency of Boost-Converter Current Source
设计指南 电子血压计的设计考虑
设计指南 Important Design Considerations for Digital Thermometers
设计指南 Important Design Considerations for Heart-Rate and Fitness Monitors

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题，请访问Maxim的 支持中心 。

参量

Parametric specs for LED Drivers
VIN (V) (min) 2.6
VIN (V) (max) 5.5
Max. No. of LEDs 6
# LED Channels 1
Regulation Topology Inductor Based
Battery Input 1-Cell Li+
LED Configuration Series
ILED per Channel (A) (max) 0.06
Dimming Ratio (max) 20
Dimming Control Analog
VCURR_SENSE (mV) 75
POUT (W) 0.8
ICC (mA) (max) 2
LED String Volt. (V) (max) 12
Switching Frequency (kHz) 1200
Package/Pins TDFN/8
Budgetary
Price (See Notes) 		1.47
See parametric specs for LED Drivers

主要特征

  • 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/用途

  • 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

描述

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.

简化框图

MAX1848：典型应用电路 MAX1848：典型应用电路 Zoom icon

Technical Docs

数据资料 白光LED升压型转换器，SOT23封装 Sep 15, 2005
应用笔记 Driving White LEDs in Clamshell Phones
应用笔记 Light Is On When Power Is Out
应用笔记 白色LED的恒流驱动
应用笔记 标准和白光LED的基础知识与驱动
应用笔记 Powering Six White LEDs with High Efficiency Using the MAX1848
应用笔记 Powering Four White LEDs with High Efficiency Using the MAX1848
应用笔记 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 Feedback Circuit Enhances Efficiency of Boost-Converter Current Source
设计指南 电子血压计的设计考虑
设计指南 Important Design Considerations for Digital Thermometers
设计指南 Important Design Considerations for Heart-Rate and Fitness Monitors

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题，请访问Maxim的 支持中心 。