Key facts
- Brand
- Linear Technology
- Model
- LTC3225
- Category
- Other Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2012-06-05
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Linear Technology LTC3225 Supercapacitor Charger Application Note
This document is an application note from Linear Technology Magazine (September 2008) focusing on replacing batteries with robust supercapacitors in power ride-through circuits. It introduces the LTC3225 as a compact solution for charging series-stacked supercapacitors and maintaining cell voltage balance.
The text details the advantages of supercapacitors over batteries, such as long cycle life (greater than 500,000 cycles) and low maintenance requirements. It provides design equations for estimating effective capacitance and circuit resistance to determine ride-through time, along with example application circuits using the LTC3225 in conjunction with DC/DC converters.
Linear Technology LTC3225 specifications
| Package Type | 10-lead 3mm x 3mm DFN package |
|---|---|
| Charging Current | up to 150mA |
| Charge Voltage Options | 4.8V or 5.3V |
Source: Linear Technology LTC3225 Supercapacitor Charger Application Note
All Linear Technology LTC3225 documents by type
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the cycle life of a supercapacitor compared to a battery?
A capacitor's cycle life is quoted as greater than 500,000 cycles; batteries are specified for only a few hundred cycles.
From: Linear Technology LTC3225 Supercapacitor Charger Application Note
What is the maximum programmable charging current for the LTC3225?
The charger features a programmable charging current of up to 150mA.
From: Linear Technology LTC3225 Supercapacitor Charger Application Note
How long can the circuit deliver 20W of power after the main supply fails?
The output voltages remain in regulation for 1.42 seconds after the main power is removed.
From: Supercapacitors Can Replace a Backup Battery for Power Ride-Through Applications Design Note 450
What charging current does the LTC3225 use to charge two series supercapacitors?
The charger maintains a programmable charging current of up to 150mA.
From: Supercapacitors Can Replace a Backup Battery for Power Ride-Through Applications Design Note 450