Analog Devices Inc. LTC4041 2.5A Supercapacitor Backup Power Manager
Analog Devices Inc. LTC4041 2.5A Supercapacitor Backup Power Manager is a backup system for 2.9V to 5.5V supply rails. The LTC4041 has a high current step-down DC/DC converter to charge a single supercapacitor or two supercapacitors in series. When input power is unavailable, the step-down regulator operates in reverse as a step-up regulator to backup the system output from the supercapacitor(s).
Analog Devices Inc. LTC4041 2.5A Supercapacitor Backup Power Manager's adjustable input current limit function reduces charge current to protect the input supply from overload while an external disconnect switch isolates the input supply during backup. When the input supply drops below the adjustable PFI threshold, the 2.5A boost regulator delivers power from the supercapacitor to the system output.
An optional input overvoltage protection (OVP) circuit protects the LTC4041 from high voltage damage at the VIN pin. An internal supercapacitor balancing circuit maintains equal voltages across each supercapacitor and limits the maximum voltage of each supercapacitor to a pre-determined value. The Analog Devices Inc. LTC4041 2.5A Supercapacitor Backup Power Manager is available in a low profile (0.75mm) 24-Lead 4mm × 5mm QFN package.
Features
- 2.5A Step-Down Supercapacitor Charger
- 2.5A Step-Up Backup Supply
- 6.5A Switches for 2.5A Backup from One Supercapacitor or Two in Series
- Input Current Limit Prioritizes Load over Charge Current
- Input Disconnect Switch Isolates Input During Backup
- Automatic Seamless Switch-Over to Backup Mode
- Internal Supercapacitor Balancer (No External Resistors)
- Programmable Charge Current and Charge Voltage
- Input Power Fail Indicator
- System Power Good Indicator
- Optional OVP Circuitry Protects Device to >60V
- Constant Frequency Operation
- Thermally Enhanced 24-Lead 4mm × 5mm QFN Package
Applications
- Ride-Through “Dying Gasp” Supplies
- High Current Ride-Through 3V to 5V UPS
- Power Meters/Industrial Alarms
- Servers/Solid State Drives
Typical Application
Associated Tool
Analog Devices Inc. DC2642A Eval Board for the LTC4041 Power Manager
Operates with a stack of two series capacitors DC2642A-A and a single capacitor DC2642A-B.
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