LTC4041
2.5A Supercapacitor
Backup Power Manager
FEATURES
DESCRIPTION
The LTC®4041 is a complete supercapacitor backup sys-
tem for 2.9V to 5.5V supply rails. It contains a high cur-
rent step-down DC/DC converter to charge a single super-
capacitor 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).
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2.5A Step-Down Supercapacitor Charger and 2.5A
Step-Up Backup Supply
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6.5A Switches for 2.5A Backup from One
Supercapacitor or Two in Series
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Input Current Limit Prioritizes Load over
Charge Current
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Input Disconnect Switch Isolates Input During Backup
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Automatic Seamless Switch-Over to Backup Mode
The LTC4041’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 regula-
tor delivers power from the supercapacitor to the system
output.
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Internal Supercapacitor Balancer (No External
Resistors)
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Programmable Charge Current and Charge Voltage
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Input Power Fail Indicator
System Power Good Indicator
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Optional OVP Circuitry Protects Device to >60V
Constant Frequency Operation
Thermally Enhanced 24-Lead 4mm × 5mm
QFN Package
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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-deter-
mined value. The LTC4041 is available in a low profile
(0.75mm) 24-Lead 4mm × 5mm QFN package.
APPLICATIONS
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Ride-Through “Dying Gasp” Supplies
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High Current Ride-Through 3V to 5V UPS
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Power Meters/Industrial Alarms
Servers/Solid State Drives
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 6522118, 6570372, 6700364, 8139329.
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TYPICAL APPLICATION
Single Supercapacitor 3.3V Backup Application
Complete Backup Event with
a Single 10F Supercapacitor
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Rev A
1
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