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3.3V/5V或可调输出、升压型DC-DC转换器

产品详情

主要特征

应用/用途

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.8
VIN (V) (max) 6
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.15
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Power Good Signal Yes
ICC (mA) (typ) 0.025
Shutdown Mode Supply Current (µA) (typ) 1
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2.5
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参量

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.8
VIN (V) (max) 6
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 0.15
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Power Good Signal Yes
ICC (mA) (typ) 0.025
Shutdown Mode Supply Current (µA) (typ) 1
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2.5

主要特征

  • 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

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 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.

简化框图

MAX856、MAX857、MAX858、MAX859:典型工作电路 MAX856、MAX857、MAX858、MAX859:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索您所需的答案。

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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