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BQ77905

AKTIV

Stapelbarer Batterieschutzbaustein, Ultra-Low-Power, für Li-Ion- und Li-Phosphat-Batterien mit 3 bis

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Datenblatt

BQ77905

AKTIV
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Produktdetails

Rating Catalog Number of series cells (max) 4, 5 Number of series cells (min) 3, 4, 5 Features FET drive, Open wire (OW), Over-temperature (OT), Overcurrent during discharge (OCD), Overvoltage, Short-circuit Discharge (SCD), Stackable, Under-temperature (UT), Undervoltage Function Protection Operating current (typ) (µA) 6 Vin (max) (V) 25 TI functional safety category Functional Safety-Capable Overvoltage protection 3.7, 3.9, 4.175, 4.2, 4.25 Operating temperature range (°C) -40 to 85 Battery overvoltage protection (min) (V) 3 Battery overvoltage protection (max) (V) 4.575
Rating Catalog Number of series cells (max) 4, 5 Number of series cells (min) 3, 4, 5 Features FET drive, Open wire (OW), Over-temperature (OT), Overcurrent during discharge (OCD), Overvoltage, Short-circuit Discharge (SCD), Stackable, Under-temperature (UT), Undervoltage Function Protection Operating current (typ) (µA) 6 Vin (max) (V) 25 TI functional safety category Functional Safety-Capable Overvoltage protection 3.7, 3.9, 4.175, 4.2, 4.25 Operating temperature range (°C) -40 to 85 Battery overvoltage protection (min) (V) 3 Battery overvoltage protection (max) (V) 4.575
TSSOP (PW) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • NORMAL mode: 6 µA (BQ77904 and BQ77905)
  • Full suite of voltage, current, and temperature protections
  • Scalable cell count from 3 series to 20 series or more
  • Voltage protection (accuracy ±10 mV)
    • Overvoltage: 3 V to 4.575 V
    • Undervoltage: 1.2 V to 3 V
  • Open cell and open-wire detection (OW)
  • Current Protection
    • Overcurrent discharge 1: –10 mV to –85 mV
    • Overcurrent discharge 2: –20 mV to +170 mV
    • Short circuit discharge: –40 mV to +340 mV
    • Accuracy ±20% for ≤ 20 mV, ±30% for > 20 mV across full temperature
  • Temperature protection
    • Overtemperature charge: 45°C or 50°C
    • Overtemperature discharge: 65°C or 70°C
    • Undertemperature charge: –5°C or 0°C
    • Undertemperature discharge: –20°C or –10°C
  • Additional Features
    • Independent charge (CHG) and discharge (DSG) FET drivers
    • 36-V absolute maximum rating per cell input
    • Built-in-self-test functions for high reliability
  • SHUTDOWN mode: 0.5-µA maximum
  • Functional Safety-Capable
  • NORMAL mode: 6 µA (BQ77904 and BQ77905)
  • Full suite of voltage, current, and temperature protections
  • Scalable cell count from 3 series to 20 series or more
  • Voltage protection (accuracy ±10 mV)
    • Overvoltage: 3 V to 4.575 V
    • Undervoltage: 1.2 V to 3 V
  • Open cell and open-wire detection (OW)
  • Current Protection
    • Overcurrent discharge 1: –10 mV to –85 mV
    • Overcurrent discharge 2: –20 mV to +170 mV
    • Short circuit discharge: –40 mV to +340 mV
    • Accuracy ±20% for ≤ 20 mV, ±30% for > 20 mV across full temperature
  • Temperature protection
    • Overtemperature charge: 45°C or 50°C
    • Overtemperature discharge: 65°C or 70°C
    • Undertemperature charge: –5°C or 0°C
    • Undertemperature discharge: –20°C or –10°C
  • Additional Features
    • Independent charge (CHG) and discharge (DSG) FET drivers
    • 36-V absolute maximum rating per cell input
    • Built-in-self-test functions for high reliability
  • SHUTDOWN mode: 0.5-µA maximum
  • Functional Safety-Capable

The BQ77904 and BQ77905 devices are low-power battery pack protectors that implement a suite of voltage, current, and temperature protections without microcontroller (MCU) control. The device’s stackable interface provides simple scaling to support battery cell applications from 3 series to 20 series or more. Protection thresholds and delays are factory-programmed and available in a variety of configurations. Separate overtemperature and undertemperature thresholds for discharge (OTD and UTD) and charge (OTC and UTC) are provided for added flexibility.

The device achieves pack protection through the integrated independent CHG and DSG low-side NMOS FET drivers, which may be disabled through two control pins. These control pins may also be used to achieve cell protection solutions for higher series (6 series and beyond) in a simple and economical manner. To do this, simply cascade a higher device CHG and DSG outputs to the immediate lower device control pins. For a reduced component count, all protection faults use internal delay timers.

The BQ77904 and BQ77905 devices are low-power battery pack protectors that implement a suite of voltage, current, and temperature protections without microcontroller (MCU) control. The device’s stackable interface provides simple scaling to support battery cell applications from 3 series to 20 series or more. Protection thresholds and delays are factory-programmed and available in a variety of configurations. Separate overtemperature and undertemperature thresholds for discharge (OTD and UTD) and charge (OTC and UTC) are provided for added flexibility.

The device achieves pack protection through the integrated independent CHG and DSG low-side NMOS FET drivers, which may be disabled through two control pins. These control pins may also be used to achieve cell protection solutions for higher series (6 series and beyond) in a simple and economical manner. To do this, simply cascade a higher device CHG and DSG outputs to the immediate lower device control pins. For a reduced component count, all protection faults use internal delay timers.
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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt BQ77904, BQ77905 3-Series to 20-Series Ultra Low-Power Voltage, Current, Temperature, and Open-Wire Stackable Lithium-Ion Battery Protector datasheet (Rev. K) PDF | HTML 31.07.2020
Anwendungshinweis bq77905 20S Cell Stacking Configuration (Rev. B) 23.06.2021
Informationen zur funktionalen Sicherheit BQ77905 Function Safety Capable 13.07.2020
E-book Ein Techniker-Leitfaden für Industrieroboter-Designs Download English Version 25.03.2020
Anwendungshinweis High Side Charge FET Implementation 23.07.2018
Anwendungshinweis bq77905 Pin Equivalent Diagrams 28.11.2017
Anwendungshinweis bq77905 Shutdown for Current Reduction 21.07.2017
Anwendungshinweis BQ77905 Design Considerations in High-Current Applications 05.12.2016
Anwendungshinweis Bq77905 Using Multiple FETs PDF | HTML 15.07.2016
EVM User's guide bq77905 3-5S Low-Power Protector Evaluation Module (Rev. A) 07.07.2016
Anwendungshinweis bq77905 Separate Current Paths (Rev. A) 07.07.2016

Design und Entwicklung

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Evaluierungsplatine

BQ77905EVM-707 — bq77905 Skalierbarer Batterieschutz der 3- bis 5-Serien mit geringem Stromverbrauch – Evaluierungsmo

Das bq77905EVM-707 ist eine Evaluierungsplatine für den energieeffizienten bq77905-Batterieschutz-IC.  Der bq77905-IC unterstützt 3- bis 5S-Batteriezellenkonfigurationen und kann gestapelt werden, um einen komfortablen vollständigen Stack von 20 seriellen Zellen zu unterstützen. Darüber hinaus (...)

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