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3.3V/5V/可调输出、升压型DC-DC转换器

对于新设计推荐使用性能更好的器件:MAX1674/MAX1675/MAX1676

产品详情

主要特征

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.7
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.3
Switch Type Internal
Output Adjust. Method Resistor
Power Good Signal Yes
Shutdown Mode Supply Current (µA) (typ) 0.02
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.29
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参量

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.7
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.3
Switch Type Internal
Output Adjust. Method Resistor
Power Good Signal Yes
Shutdown Mode Supply Current (µA) (typ) 0.02
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.29

主要特征

  • Operates Down to 0.7V Input Supply Voltage
  • 87% Efficiency at 200mA
  • 60µA Quiescent Current
  • 20µA Shutdown Mode with Active Reference and LBI Detector
  • 500kHz Maximum Switching Frequency
  • ±1.5% Reference Tolerance Over Temperature
  • Low-Battery Detector (LBI/LBO)
  • 8-Pin DIP and SO Packages

应用/用途

  • 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

描述

The MAX756/MAX757 are CMOS step-up DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX756 accepts a positive input voltage down to 0.7V and converts it to a higher pin-selectable output voltage of 3.3V or 5V. The MAX757 is an adjustable version that accepts an input voltage down to 0.7V and generates a higher adjustable output voltage in the range from 2.7V to 5.5V. Typical full-load efficiencies for the MAX756/MAX757 are greater than 87%.

The MAX756/MAX757 provide three improvements over previous devices. Physical size is reduced-the high switching frequencies (up to 0.5MHz) made possible by MOSFET power transistors allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is improved to 87% (10% better than with low-voltage regulators fabricated in bipolar technology). Supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation control scheme.

简化框图

MAX756、MAX757:典型工作电路 MAX756、MAX757:典型工作电路 Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

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