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Circuitos integrados de gestión de baterías
Protectores de baterías

BQ77905

ACTIVO

Protector de batería apilable de potencia ultrabaja de iones de litio y fosfato de litio de serie 3

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BQ77905

ACTIVO
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Detalles del producto

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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos 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
Nota sobre la aplicación bq77905 20S Cell Stacking Configuration (Rev. B) 23/06/2021
Información sobre seguridad funcional BQ77905 Function Safety Capable 13/07/2020
Libro electrónico E-book: An engineer’s guide to industrial robot designs 12/02/2020
Nota sobre la aplicación High Side Charge FET Implementation 23/07/2018
Nota sobre la aplicación bq77905 Pin Equivalent Diagrams 28/11/2017
Nota sobre la aplicación bq77905 Shutdown for Current Reduction 21/07/2017
Nota sobre la aplicación BQ77905 Design Considerations in High-Current Applications 5/12/2016
Nota sobre la aplicación Bq77905 Using Multiple FETs PDF | HTML 15/07/2016
EVM User's guide bq77905 3-5S Low-Power Protector Evaluation Module (Rev. A) 7/07/2016
Nota sobre la aplicación bq77905 Separate Current Paths (Rev. A) 7/07/2016

Diseño y desarrollo

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Placa de evaluación

BQ77905EVM-707 — Módulo de evaluación de protector de batería de baja potencia apilable avanzado de serie 3 a 5 bq779

El bq77905EVM-707 es una placa de evaluación para el bq77905, un CI de protección de la batería de baja potencia.  El CI bq77905 admite configuraciones de celdas de batería 3-5S y se puede apilar para admitir cómodamente una pila completa de 20 celdas en serie. Además, el bq77905 implementa un (...)

Guía del usuario: PDF
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TSSOP (PW) 20 Ultra Librarian
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