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2或3节电池、升/降压型、双向寻呼机系统电源IC

完备的电源及监控系统,简化设计、降低成本、节省空间

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主要特征

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主要特征

  • Regulated Step-Up/Step-Down Operation
  • 80mA Output from 3 Cells
  • 85% Efficiency
  • 13µA Idle Mode™ (coast) Current
  • Selectable Low-Noise PWM or Low-Current PFM Operation
  • PWM Operating Frequency Synchronized to Seven Times an External Clock Source
  • Operates at 270kHz with No External Clock
  • Automatic Backup-Battery Switchover

应用/用途

  • 2节或3节电池供电的手持设备
  • GPS接收机
  • 双向寻呼

描述

The MAX769 is a complete buck/boost power supply and monitoring system for two-way pagers or other low-power digital communications devices. Few external components are required. Included on-chip are:
  • An 80mA output, synchronous-rectified, buck/boost DC-DC converter with a digitally controlled +1.8V to +4.9V output. The DC-DC converter is unique, since it provides a regulated output for battery inputs that are both less than and greater than the output voltage, without using transformers.
  • Three low-noise linear-regulator outputs
  • Three DAC-controlled comparators for software-driven, 3-channel A/D conversion
  • SPI™-compatible serial interface
  • Reset and low-battery (LBO) warning outputs
  • Charger for NiCd/NiMH, lithium battery, or storage capacitor for RF PA power or system backup
  • Two 1.8Ω (typical), serial-controlled, open-drain MOSFET switches for beeper or vibrator drive
An evaluation kit for the MAX769 (MAX769EVKIT) is available to aid in design and prototyping.

简化框图

MAX769:典型工作电路 MAX769: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