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Features
- 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
Description
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.
| Features | |
|---|---|
| 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. |
7x7 LQFP-48,7x7 QFN-48
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3300HLXE-1#PBF | LQFP | 48 | H | $9.57 | $6.70 |
| LTC3300HLXE-2#PBF | LQFP | 48 | H | $9.57 | $6.70 |
| LTC3300HUK-1#PBF | QFN | 48 | H | $8.86 | $6.20 |
| LTC3300HUK-1#TRPBF | QFN | 48 | H | $6.26 | |
| LTC3300HUK-2#PBF | QFN | 48 | H | $8.86 | $6.20 |
| LTC3300HUK-2#TRPBF | QFN | 48 | H | $6.26 | |
| LTC3300ILXE-1#PBF | LQFP | 48 | I | $8.86 | $6.20 |
| LTC3300ILXE-2#PBF | LQFP | 48 | I | $8.86 | $6.20 |
| LTC3300IUK-1#PBF | QFN | 48 | I | $8.50 | $5.95 |
| LTC3300IUK-1#TRPBF | QFN | 48 | I | $6.01 | |
| LTC3300IUK-2#PBF | QFN | 48 | I | $8.50 | $5.95 |
| LTC3300IUK-2#TRPBF | QFN | 48 | I | $6.01 |
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.