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Cache-Memory Battery-Backup Management IC

Complete Cache-Memory Battery-Backup IC Reduces System Cost, Component Count, and Footprint Over Current Solutions

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Key Features

  • Lithium Chemistry CCCV Charger
  • Adjustable Regulated Charging Up to 1.5A DC
  • Adjustable Charge Voltage from 3.8V to 4.6V
  • External and Internal Thermal Protection
  • Safety Timer Secondary Termination
  • LED Indicator Outputs
  • Detects Power Outage and Switches Between Normal Power and Backup Battery
  • Adjustable High-Efficiency Synchronous Buck Regulator with Skip Mode at Light Loads
  • Low-Power Consumption in Discharge Mode

Applications/Uses

  • RAID Server Memory Card

Description

The DS2731 is a complete power-management solution for modular backup applications. It is well-suited for 2.5V and below memory bus voltages, with an input voltage of 12V. The DS2731 includes an internal MOSFET switching power stage for charging a one-cell lithium chemistry battery. It has a fully integrated synchronous buck regulator capable of supplying up to 450mA of cache backup supply current, and the necessary logic and power devices for handling the switchover from system power to battery power. The battery charging method of the DS2731 is constant current/constant voltage (CCCV). Output voltage can be margined from 3.8V to 4.6V using a resistor-divider. Charge is terminated when the charging current falls below 5% of full charge current. Switchover to battery backup is initiated by an internal comparator and occurs automatically when a sensed-input voltage drops below 2.93V. At light loads, the 2MHz internal synchronous buck regulator operates in burst mode for maximum efficiency. All nonessential functions of the DS2731 are disabled while supplying holdup current to the cache memory, and the IC goes into very low-current dormant mode when the battery voltage drops below a user-settable threshold. The DS2731 keeps track of charge status and signals the user through open-drain I/O pins that can be used to drive LEDs.

Simplified Block Diagram

DS2731: Typical Operating Circuit DS2731: 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.