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LTC3226
2-Cell Supercapacitor Charger with Backup PowerPath Controller
Overview
Features and Benefits
- 1x/2x Multimode Charge Pump Supercapacitor Charger
- Automatic Cell Balancing
- Ideal Diode Main PowerPath™ Controller (VIN to VOUT)
- Internal 2A LDO Backup Supply (CPO to VOUT)
- Automatic Main/Backup Switchover
- Input Voltage Range: 2.5V to 5.5V
- Programmable SCAP Charge Voltage
- Programmable Input Current Limit (315mA Max)
- No Load IVIN = 55μA (Typical)
- Low Profile, 16-Lead 3mm × 3mm QFN Package
Product Details
The LTC3226 is a 2-cell series supercapacitor charger with a backup PowerPath controller. It includes a charge pump supercapacitor charger with programmable output voltage, a low dropout regulator, and a power-fail comparator for switching between normal and backup modes.
The constant input current supercapacitor charger is designed to charge two supercapacitors in series to a resistor-programmable output voltage from a 2.5V to 5.3V input supply. The charger input current limit is programmable by an external resistor at up to 315mA.
The internal backup LDO is powered from the supercapacitors and provides up to 2A peak output current with an adjustable output voltage. When the input supply falls below the power-fail threshold, the LTC3226 automatically enters a backup state in which the supercapacitors power the output through the LDO. The input supply power-fail voltage level is programmed by an external resistor divider.
Low input noise, low quiescent current and a compact footprint make the LTC3226 ideally suited for small, batterypowered applications. Internal current limit and thermal shutdown circuitry allow the device to survive a continuous short-circuit from the PROG or CPO pins to ground.
Applications
- Smart Power Meters
- Battery-Powered Industrial/Medical Equipment
- 3.3V Solid-State Drives
- Industrial Alarms
- Data Backup Supplies
- Battery Hold-Up Supplies
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation
Reliability Data (1)
User Guides (1)
Tools & Simulations
LTspice
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Reference Materials
Technical Articles (1)
Design Resources
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Support & Discussions
LTC3226 Discussions
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Sampling:
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.