MAX857 - 3.3V/5V或可调输出、升压型DC-DC转换器

MAX857是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX857是3.3V/5V或可调输出、升压型DC-DC转换器，本站介绍了MAX857的封装应用图解、特点和优点、功能等，并给出了与MAX857相关的Maxim元器件型号供参考。

MAX857 - 3.3V/5V或可调输出、升压型DC-DC转换器 - DC-DC开关调节器 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

The MAX856-MAX859 are high-efficiency, CMOS, step-up, DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX856/MAX858 accept a positive input voltage between 0.8V and VOUT and convert it to a higher, pin-selectable output voltage of 3.3V or 5V. The MAX857/MAX859 adjustable versions accept 0.8V to 6.0V input voltages and generate higher adjustable output voltages in the 2.7V to 6.0V range. Typical efficiencies are greater than 85%. Typical quiescent supply current is 25µA (1µA in shutdown).

The MAX856-MAX859 combine ultra-low quiescent supply current and high efficiency to give maximum battery life. An internal MOSFET power transistor permits high switching frequencies. This benefit, combined with internally set peak inductor current limits, permits the use of small, low-cost inductors. The MAX856/MAX857 have a 500mA peak inductor current limit. The MAX858/MAX859 have a 125mA peak inductor current limit.

关键特性

以下关键特性由Maxim美信半导体提供：

0.8V to 6.0V Input Supply Voltage

0.8V Typ Start-Up Supply Voltage

85% Efficiency at 100mA

25µA Quiescent Current

1µA Shutdown Mode

125mA and 500mA Switch-Current Limits Permit Use of Low-Cost Inductors

Up to 500kHz Switching Frequency

±1.5% Reference Tolerance Over Temperature

Low-Battery Detector (LBI/LBO)

8-Pin SO and µMax Packages

热门应用

2节和3节电池供电设备

3.3V至5V升压转换

血糖表

医疗仪表

掌上电脑

个人数据通信/计算机

便携式数据收集设备

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