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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

产品详情

主要特征

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
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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

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

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在Maxim的知识库中搜索技术问题的答案

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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