MAX1678 - 1节至2节电池、低噪声、高效率、升压型DC-DC转换器

MAX1678是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1678是1节至2节电池、低噪声、高效率、升压型DC-DC转换器，本站介绍了MAX1678的封装应用图解、特点和优点、功能等，并给出了与MAX1678相关的Maxim元器件型号供参考。

MAX1678 - 1节至2节电池、低噪声、高效率、升压型DC-DC转换器 - DC-DC开关调节器 - 高效1节电池升压转换器，用于寻呼设备 - 美信半导体

产品概述

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.

关键特性

以下关键特性由Maxim美信半导体提供：

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

热门应用

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

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