LTC3226 - 2-Cell Supercapacitor Charger with Backup PowerPath Controller
Features
- 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
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3226 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.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3226EUD#PBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LTC3226EUD#TRPBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LTC3226IUD#PBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
| LTC3226IUD#TRPBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3226EUD#PBF | 3x3 QFN-16 | E | $3.82 | $2.67 | Yes | |
| LTC3226EUD#TRPBF | 3x3 QFN-16 | E | $2.73 | Yes | ||
| LTC3226IUD#PBF | 3x3 QFN-16 | I | $4.39 | $3.07 | Yes | |
| LTC3226IUD#TRPBF | 3x3 QFN-16 | I | $3.13 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1735A | LTC3226EUD Demo Board u 2-Cell Supercap Charger with Backup PowerPath Controller | $100.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3226IUD#PBF | 3x3 QFN-16 | I | $4.39 | $3.07 | Yes | |
| LTC3226IUD#TRPBF | 3x3 QFN-16 | I | $3.13 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Smart Power Meters
- Battery-Powered Industrial/Medical Equipment
- 3.3V Solid-State Drives
- Industrial Alarms
- Data Backup Supplies
- Battery Hold-Up Supplies
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC3226
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
