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状况：生产中。

概述

完整的数据资料 (PDF, 284kB) 英文 下载 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.

现备有评估板：  MAX1848EVKIT  

关键特性		应用/使用
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		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

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