BQ76925 Series
Analog front end for 3 to 6 series lithium-ion cells
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
Analog front end for 3 to 6 series lithium-ion cells
| Part | Battery Chemistry | Operating Temperature [Min] | Operating Temperature [Max] | Fault Protection | Package / Case | Package / Case | Package / Case | Supplier Device Package | Function | Number of Cells [Min] | Number of Cells [Max] | Mounting Type | Interface | Embedded | Utilized IC / Part | Supplied Contents | Secondary Attributes | Primary Attributes [Max] | Primary Attributes [Min] | Type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ76925PWR | Lithium Ion/Polymer | -25 °C | 85 C | Over Current, Over Temperature, Over/Under Voltage | 0.173 in | 4.4 mm | 20-TSSOP | 20-TSSOP | Multi-Function Controller | 3 | 6 | Surface Mount | I2C | |||||||
Texas Instruments BQ76925RGER | Lithium Ion/Polymer | -25 °C | 85 C | Over Current, Over Temperature, Over/Under Voltage | 24-VFQFN Exposed Pad | 24-VQFN (4x4) | Multi-Function Controller | 3 | 6 | Surface Mount | I2C | |||||||||
Texas Instruments BQ76925EVM | Battery Monitor | Yes, MCU, 16-Bit | BQ76925, MSP430F2122 | Board(s) | On-Board LEDs | 6 Cells, 26.4 V | 3 Cells, 4.2 V | Power Management | ||||||||||||
Texas Instruments BQ76925RGET | Lithium Ion/Polymer | -25 °C | 85 C | Over Current, Over Temperature, Over/Under Voltage | 24-VFQFN Exposed Pad | 24-VQFN (4x4) | Multi-Function Controller | 3 | 6 | Surface Mount | I2C |
Key Features
• Analog interface for host cell measurementCell input MUX, level shifter, and scaler1.5-/ 3.0-V low-drift, calibrated reference allows accurate analog-to-digital conversionsAnalog interface for host current measurementVariable gain current sense amplifier capable of operation with 1-mΩ sense resistorSwitchable thermistor bias output for host temperature measurementsOvercurrent comparator with dynamically adjustable thresholdAlerts host to potential overcurrent faultsWakes up host on load connectIntegrated cell balancing FETsIndividual host control50 mA per cell balancing currentSupports cell sense-line open wire detectionIntegrated 3.3-V regulator for powering micro-controller or LEDsI2C interface for host communicationsOptional packet CRC for robust operationSupply voltage range from 4.2 V to 26.4 VLow power consumption40 µA typical in NORMAL mode1.5 µA maximum in SLEEP mode20-pin TSSOP or 24-pin VQFN packageAnalog interface for host cell measurementCell input MUX, level shifter, and scaler1.5-/ 3.0-V low-drift, calibrated reference allows accurate analog-to-digital conversionsAnalog interface for host current measurementVariable gain current sense amplifier capable of operation with 1-mΩ sense resistorSwitchable thermistor bias output for host temperature measurementsOvercurrent comparator with dynamically adjustable thresholdAlerts host to potential overcurrent faultsWakes up host on load connectIntegrated cell balancing FETsIndividual host control50 mA per cell balancing currentSupports cell sense-line open wire detectionIntegrated 3.3-V regulator for powering micro-controller or LEDsI2C interface for host communicationsOptional packet CRC for robust operationSupply voltage range from 4.2 V to 26.4 VLow power consumption40 µA typical in NORMAL mode1.5 µA maximum in SLEEP mode20-pin TSSOP or 24-pin VQFN package
Description
AI
The BQ76925 host-controlled analog front end (AFE) is part of a complete pack monitoring, balancing, and protection system for 3-, 4-, 5-, or 6-series cell li-ion and li-polymer batteries. The BQ76925 device allows a host controller to monitor individual cell voltages, pack current and temperature easily. The Host may use this information to determine unsafe or faulty operating conditions such as overvoltage, undervoltage, overtemperature, overcurrent, cell imbalance, state of charge, and state of health conditions.
Cell input voltages are level-shifted, multiplexed, scaled, and output for measurement by a host ADC. A dedicated pin provides a low-drift calibrated reference voltage to enable accurate measurements.
The voltage across an external-sense resistor is amplified and output to a host ADC for both charge and discharge current measurements. Two gain settings enable operation with a variety of sense resistor values over a wide range of pack currents.
To enable temperature measurements by the host, the AFE provides a separate output pin for biasing an external thermistor network. This output can be switched on and off under host control to minimize power consumption.
The BQ76925 device includes a comparator with a dynamically selectable threshold for monitoring current. The comparator result is driven through an open-drain output to alert the host when the threshold is exceeded. This feature can be used to wake up the host on connection of the load, or to alert the host to a potential fault condition.
The BQ76925 device integrates cell balancing FETs that are fully controlled by the host. The balancing current is set by external resistors up to a maximum value of 50 mA. These same FETs may be utilized in conjunction with cell voltage measurements to detect an open wire on a cell sense-line.
The host communicates with the AFE through an I2C interface. A packet CRC may optionally be used to ensure robust operation. The device may be put into a low-current sleep mode through the I2C interface and awakened by pulling up the ALERT pin.
The BQ76925 host-controlled analog front end (AFE) is part of a complete pack monitoring, balancing, and protection system for 3-, 4-, 5-, or 6-series cell li-ion and li-polymer batteries. The BQ76925 device allows a host controller to monitor individual cell voltages, pack current and temperature easily. The Host may use this information to determine unsafe or faulty operating conditions such as overvoltage, undervoltage, overtemperature, overcurrent, cell imbalance, state of charge, and state of health conditions.
Cell input voltages are level-shifted, multiplexed, scaled, and output for measurement by a host ADC. A dedicated pin provides a low-drift calibrated reference voltage to enable accurate measurements.
The voltage across an external-sense resistor is amplified and output to a host ADC for both charge and discharge current measurements. Two gain settings enable operation with a variety of sense resistor values over a wide range of pack currents.
To enable temperature measurements by the host, the AFE provides a separate output pin for biasing an external thermistor network. This output can be switched on and off under host control to minimize power consumption.
The BQ76925 device includes a comparator with a dynamically selectable threshold for monitoring current. The comparator result is driven through an open-drain output to alert the host when the threshold is exceeded. This feature can be used to wake up the host on connection of the load, or to alert the host to a potential fault condition.
The BQ76925 device integrates cell balancing FETs that are fully controlled by the host. The balancing current is set by external resistors up to a maximum value of 50 mA. These same FETs may be utilized in conjunction with cell voltage measurements to detect an open wire on a cell sense-line.
The host communicates with the AFE through an I2C interface. A packet CRC may optionally be used to ensure robust operation. The device may be put into a low-current sleep mode through the I2C interface and awakened by pulling up the ALERT pin.