Supercapacitor charger has cell-balancing and voltage-clamping features to balance voltages
Linear Technology
LTC3226
Linear Technology has introduced the LTC3226, an inductorless supercapacitor charger with back-up Powerpath controller for Li-ion or other low-voltage system rails in applications that require short-term back-up power.
The device employs a low-noise dual mode (1x/2x) charge-pump architecture with constant input current to charge two supercapacitors in series from a 2.5–5.5V input supply to a programmable capacitor charge voltage between 2.5–5.3V.
The device’s automatic cell-balancing and voltage-clamping features maintain equal voltages on both cells without requiring balancing resistors.
This protects each supercapacitor from overvoltage damage that could otherwise be caused by mismatches in cell capacitance or leakage, while also minimising current drain on the capacitors.
Click here to download the data sheet.
Additional information
- Internal 2A LDO back-up supply (CPO to VOUT)
- Automatic main/back-up switchover
- Input voltage range: 2.5–5.5V programmable SCAP charging voltage and input
- Current limit (315mA max)
- No load IVIN = 55μA
- Dimensions: (0.75mm) 3 × 3mm 16-lead QFN package
- Operating temperature range: -40°C to 125°C
- Charge current is resistor programmable up to 150mA
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