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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

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
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.09
Switch Type Internal
Preset VOUT (V) 3
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
Synchronous Switching? Yes
ICC (mA) (typ) 0.037
Shutdown Mode Supply Current (µA) (typ) 0.1
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Package/Pins UMAX/8
Budgetary
Price (See Notes)
2.03
缩小

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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
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.09
Switch Type Internal
Preset VOUT (V) 3
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
Synchronous Switching? Yes
ICC (mA) (typ) 0.037
Shutdown Mode Supply Current (µA) (typ) 0.1
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Package/Pins UMAX/8
Budgetary
Price (See Notes)
2.03

主要特征

  • 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/用途

  • 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

描述

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.

简化框图

MAX1678:典型工作电路 MAX1678: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