LTC3300-2 - Addressable High Efficiency Bidirectional Multicell Battery Balancer


  • Bidirectional Synchronous Flyback Balancing of Up to 6 Li-Ion or LiFePO4 Cells in Series
  • Up to 10A Balancing Current (Set by Externals)
  • Integrates Seamlessly with the LTC680x Family of Multicell Battery Stack Monitors
  • Bidirectional Architecture Minimizes Balancing Time and Power Dissipation
  • Up to 92% Charge Transfer Efficiency
  • Stackable Architecture Enables >800V Systems
  • Uses Simple 2-Winding Transformers
  • 1MHz Serial Interface with 4-Bit CRC Packet Error Checking
  • Individually Addressable with 5-Bit Address
  • Numerous Fault Protection Features
  • 48-Lead Exposed Pad QFN and LQFP Packages

Typical Application

LTC3300-2 Typical Application
LTC3300-2 Typical Application


The LTC®3300-2 is a fault-protected controller IC for transformer-based bidirectional active balancing of multicell battery stacks. All associated gate drive circuitry, precision current sensing, fault detection circuitry and a robust serial interface with built-in watchdog timer are integrated.

Each LTC3300-2 can balance up to 6 series-connected battery cells with an input common mode voltage up to 36V. Charge from any selected cell can be transferred at high efficiency to or from 12 or more adjacent cells. Each LTC3300-2 has an individually addressable serial interface, allowing up to 32 LTC3300-2 devices to interface to one control processor.

Fault protection features include readback capability, cyclic redundancy check (CRC) error detection, maximum on-time volt-second clamps, and overvoltage shutoffs.

The related LTC3300-1 offers a serial interface that allows the serial ports of multiple LTC3300-1 devices to be daisychained without opto-couplers or isolators.

LTC3300-1 SPI-compatible serial interface in which each chip in the stack communicates bidirectionally to the chips of the same type above and below it via currents.  There is no limit to the stack height. Large common mode voltage differences are handled by each LTC3300-1. The microprocessor in the BMS system communicates ONLY with the bottom chip in the stack and subsequently all of the chips use the same fixed internal address.
LTC3300-2 SPI-compatible serial interface in which each chip has a unique 5-bit pin-strapped address. The microprocessor in the BMS system communicates directly with every chip in the stack with common mode voltage differences handled by digital isolators or optocouplers. Because of the 5-bit address, the stack height is limited to 32 LTC3300-2 ICs or 192 cells (~800V). There are 5 pins which have a different assignment, all of them serial interface related.


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
LTC3300HLXE-2#PBF 7mm x 7mm LQFP-48 LXE H 05-08-1832 Yes
LTC3300HUK-2#PBF 7x7 QFN-48 UK H 05-08-1704 Yes
LTC3300HUK-2#TRPBF 7x7 QFN-48 UK H 05-08-1704 Yes
LTC3300ILXE-2#PBF 7mm x 7mm LQFP-48 LXE I 05-08-1832 Yes
LTC3300IUK-2#PBF 7x7 QFN-48 UK I 05-08-1704 Yes
LTC3300IUK-2#TRPBF 7x7 QFN-48 UK I 05-08-1704 Yes

LTC3300-2 Package Drawing
LTC3300-2 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
LTC3300HLXE-2#PBF 7mm x 7mm LQFP-48 H $9.57 $6.70 Yes
LTC3300HUK-2#PBF 7x7 QFN-48 H $8.86 $6.20 Yes
LTC3300HUK-2#TRPBF 7x7 QFN-48 H $6.26 Yes
LTC3300ILXE-2#PBF 7mm x 7mm LQFP-48 I $8.86 $6.20 Yes
LTC3300IUK-2#PBF 7x7 QFN-48 I $8.50 $5.95 Yes
LTC3300IUK-2#TRPBF 7x7 QFN-48 I $6.01 Yes
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* 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.

Click here to view our complete list of demo boards


  • Electric Vehicles/Plug-in HEVs
  • High Power UPS/Grid Energy Storage Systems
  • General Purpose Multicell Battery Stacks

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