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MAX1678

MAX1678

1节至2节电池、低噪声、高效率、升压型DC-DC转换器

高效1节电池升压转换器，用于寻呼设备

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概述

说明

The MAX1678 is a high-efficiency, low-voltage, synchronous-rectified, step-up DC-DC converter intended for use in devices powered by 1 to 3-cell alkaline, NiMH, or NiCd batteries or a 1-cell lithium battery. It guarantees a 0.87V start-up voltage and features a low 37µA quiescent supply current.

The device includes a 1Ω, N-channel MOSFET power switch, a synchronous rectifier that acts as the catch diode, a reference, pulse-frequency-modulation (PFM) control circuitry, and circuitry to reduce inductor ringing-all in an ultra-small, 1.1mm-high µMAX® package.

The output voltage is preset to 3.3V or can be adjusted from +2V to +5.5V using only two resistors. Efficiencies up to 90% are achieved for loads up to 50mA. The device also features an independent undervoltage comparator (PFI/PFO) and a logic-controlled 2µA shutdown mode.
MAX1678：典型工作电路 MAX1678：典型工作电路 放大+

关键特性

  • 0.87V Guaranteed Start-Up
  • Up to 90% Efficiency
  • Built-In Synchronous Rectifier (no external diode)
  • Ultra-Small µMAX Package, 1.1mm High
  • 37µA Quiescent Current (85µA from 1.5V battery)
  • 2µA Logic-Controlled Shutdown
  • Power-Fail Detector
  • Dual Mode™ Output: Fixed 3.3V
  • Dual Mode Adjustable 2V to 5.5V
  • 45mA Output Current at 3.3V for 1-Cell Input
  • 90mA Output Current at 3.3V for 2-Cell Input
  • Inductor-Damping Switch Suppresses EMI

应用

  • 寻呼机
  • 个人医疗监视器
  • 指针设备
  • 远端控制
  • 单节电池供电设备

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


MAX1678EVKIT: MAX1678评估板

技术资料

应用笔记 3741 用于低压系统的模拟IC

质量与环境

产品可靠性报告: MAX1678.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注： 通过技术手段对故障率进行汇总，并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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技术文档

类型 编号 标题
应用笔记 3741 用于低压系统的模拟IC

参考设计

类型 编号 标题
评估板1882MAX1678EVKIT MAX1678评估板
评估板1882MAX1678_EVKIT MAX1678评估板