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2 or 3 Cell, Step-Up/Down, Two-Way Pager System IC

Complete Power Supply and Monitoring System Simplifies Design, Saves Cost and Space

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Key Features

  • 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

Applications/Uses

  • 2- or 3-Cell-Powered Handheld Equipment
  • GPS Receivers
  • Two-Way Paging

Description

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.

Simplified Block Diagram

MAX769: Typical Operating Circuit MAX769: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.