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LTC4040 - 2.5A Battery Backup Power Manager

General Description

The LTC®4040 is a complete 3.5V to 5.5V supply rail battery backup system.

It contains a high current step-up DC/DC regulator to back up the supply from a single-cell Li-Ion or LiFePO4 battery.

When external power is available, the step-up regulator operates in reverse as a stepdown battery charger.

Key Features

  • nn Step-Up Backup Supply and Step-Down Battery Charger nn 6.5A Switches for 2.5A Backup from 3.2V Battery nn Input Current Limit Prioritizes Load Over Charge Current nn Input Disconnect Switch Isolates Input During Backup nn Automatic Seamless Switch-Over to Backup Mode nn Input Power Loss Indicator nn System Power Loss Indicator nn Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V) or LiFePO4 (3.45V/3.5V/3.55V/3.6V) nn Optional OVP Circuitry Protects Device to >60V nn Constant Frequency Ope.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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LTC4040 2.5A Battery Backup Power Manager Features nn Step-Up Backup Supply and Step-Down Battery Charger nn 6.5A Switches for 2.5A Backup from 3.2V Battery nn Input Current Limit Prioritizes Load Over Charge Current nn Input Disconnect Switch Isolates Input During Backup nn Automatic Seamless Switch-Over to Backup Mode nn Input Power Loss Indicator nn System Power Loss Indicator nn Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V) or LiFePO4 (3.45V/3.5V/3.55V/3.6V) nn Optional OVP Circuitry Protects Device to >60V nn Constant Frequency Operation nn Low Profile (0.