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
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC3226 Typical Application
LTC3226 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


LTC3226 Package Drawing

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 NowRequest Samples
* 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 Linear Technology sales office or authorized distributor.

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
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data 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 NowRequest Samples
* 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 Linear Technology sales office or authorized distributor.

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