BQ77PL157 Series
Voltage Protection for 3 to 6 Series Cell Lithium-Ion/Polymer Batteries
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
Voltage Protection for 3 to 6 Series Cell Lithium-Ion/Polymer Batteries
| Part | Function | Mounting Type | Operating Temperature [Max] | Operating Temperature [Min] | Supplier Device Package | Package / Case [x] | Package / Case | Package / Case [x] | Number of Cells [Min] | Number of Cells [Max] | Battery Chemistry |
|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ77PL157APWR-4225 | Battery Protection | Surface Mount | 110 °C | -40 °C | 16-TSSOP | 0.173 " | 16-TSSOP | 4.4 mm | 3 | 6 | Lithium Ion/Polymer |
Texas Instruments BQ77PL157APW-4225 | Battery Protection | Surface Mount | 110 °C | -40 °C | 16-TSSOP | 0.173 " | 16-TSSOP | 4.4 mm | 3 | 6 | Lithium Ion/Polymer |
Key Features
• Single IC Li-Ion Protection for 3-Series to 6-Series CellsStackable to Protect up to 18-Series CellsProgrammable Detection Time DelayLow Power ConsumptionTypical 2-µA to 2.5-µA Normal ModeFixed 4.225 V Overvoltage ThresholdHighly Accurate: ±20-mV MAX, TA= 0°C to 50°COutput Activation for Low Side FET(Contact TI for Alternate Output Options: High/Low-side Fuse or FET)Protected Output, Power, and Ground Pins for Added Safety and ReliabilityPermanent or Recoverable Fault Options16-pin Small Outline PackageAPPLICATIONSPrimary or Secondary Level Voltage Protection for Li-Ion Battery Packs for Use in:Power ToolsUPS SystemsE-Bikes, Scooters, and Small Mobility VehiclesMedical Devices, Test Equipment, and Industrial ProductsSingle IC Li-Ion Protection for 3-Series to 6-Series CellsStackable to Protect up to 18-Series CellsProgrammable Detection Time DelayLow Power ConsumptionTypical 2-µA to 2.5-µA Normal ModeFixed 4.225 V Overvoltage ThresholdHighly Accurate: ±20-mV MAX, TA= 0°C to 50°COutput Activation for Low Side FET(Contact TI for Alternate Output Options: High/Low-side Fuse or FET)Protected Output, Power, and Ground Pins for Added Safety and ReliabilityPermanent or Recoverable Fault Options16-pin Small Outline PackageAPPLICATIONSPrimary or Secondary Level Voltage Protection for Li-Ion Battery Packs for Use in:Power ToolsUPS SystemsE-Bikes, Scooters, and Small Mobility VehiclesMedical Devices, Test Equipment, and Industrial Products
Description
AI
The bq77PL157 is a stackable overvoltage protection device for 3, 4, 5 or 6 series cell Li-Ion battery packs. This device incorporates a precise and accurate overvoltage detection circuit with preconfigured threshold limits. Additional features include the ability to stack multiple parts to monitor up to 18 series cells.
FUNCTION
Each series cell in a Li-Ion battery pack is compared to an internal reference voltage. If one cell reaches an overvoltage condition, the protection sequence begins. The bq77PL157 starts charging an external capacitor through the CD pin. When the CD pin voltage reaches 1.2 V, the OUT pin changes state and the LVO pin becomes active.
If multiple bq77PL157 devices are stacked, the LVIN pin of the next-lower device receives the LVO pin from the above device and similarly starts a shortened delay timer before activating its OUT pin. (No additional isolation or level-shift circuitry is required.) The lowest bq77PL157 in the string is used to activate a power MOSFET located in the low side of the power path.
The bq77PL157 is a stackable overvoltage protection device for 3, 4, 5 or 6 series cell Li-Ion battery packs. This device incorporates a precise and accurate overvoltage detection circuit with preconfigured threshold limits. Additional features include the ability to stack multiple parts to monitor up to 18 series cells.
FUNCTION
Each series cell in a Li-Ion battery pack is compared to an internal reference voltage. If one cell reaches an overvoltage condition, the protection sequence begins. The bq77PL157 starts charging an external capacitor through the CD pin. When the CD pin voltage reaches 1.2 V, the OUT pin changes state and the LVO pin becomes active.
If multiple bq77PL157 devices are stacked, the LVIN pin of the next-lower device receives the LVO pin from the above device and similarly starts a shortened delay timer before activating its OUT pin. (No additional isolation or level-shift circuitry is required.) The lowest bq77PL157 in the string is used to activate a power MOSFET located in the low side of the power path.