LT8303

• Variable 72 V to 96 V voltage range, suitable for E2W/E3W applications
• ASIL-D compliant and automotive grade BMS chip
• Built-in charge, pre-charge, and discharge circuitry
• 1.8 mV total measurement error (TME) for cell voltage monitoring
• High performance cell/pack voltage and current monitoring​
• On-board isoSPI communication​
• Low Power Cell Monitoring (LPCM) capability​
• GPIO Controllable FET Monitoring​
• ADBMS6830 GPIO input ready for NTC sensors​
• Low Power MAX32690 MCU​
• UART and CAN Communication​
• SOC and SOH thru Enhanced Coulomb Counting Technique​
• E2W/E3W Basic System Behavior Modes​
• Embedded Application-ready (via CLI)​
• With GUI capable of the following measurements and fault detection:​
  • Cell Monitoring​
  • Voltage and Current Pack Monitoring​
  • Charge Current Monitoring​
  • Discharge Current Monitoring​
  • Temperature Monitoring​
  • Cell OV/UV Detection​
  • Cell/GPIO Open-wire Detection​
  • Cell Balancing​
  ​

The AD-BMSE2E3W-SL is a BMS reference design for light electric vehicles (LEVs). With a voltage range of 72 V to 96 V, this solution is suitable for electric 2-wheeler and 3-wheeler vehicles with high current capacity ranging up to 100 A. ​​

This single-board system utilizes the best-in-class ADBMS6830 cell monitoring chip that is capable of monitoring up to 2x 16-channel. This board also features battery pack monitoring using the ADBMS2950. ​The ADBMS6822 dual isoSPI transceiver provides a built-in 2-wire reversible isoSPI connection, which simplifies the communication of BMS parts in a daisy chain configuration before sending the data to SPI lines in the microcontroller. ​​

The on-board MAX32690 MCU, when loaded with the firmware, can perform BMS measurements such as cell voltage (average and filtered), and pack voltage and pack current measurement. The board also has a charge, pre-charge, and discharge mode that can be controlled by the ADBMS2950 pack monitor chip.​

The AD-BMSE2E3W-SL is designed to perform either in embedded mode or using a GUI, where it calculates the battery's State of Charge (SoC) and State of Health (SoH) through enhanced coulomb counting technique.​

APPLICATIONS

• Electric and hybrid 2-wheeler vehicles
• Electric and hybrid 3-wheeler vehicles
• Light electric vehicles

Demonstration circuit 2490A is a micropower no-opto isolated flyback converter featuring the LT8303. This demo circuit outputs 5V, and maintains tight regulation with a load current from 2.5mA to 0.84A over an input voltage from 36V to 72V. The output current capability increases with the input voltage, as shown in the Performance Summary table.