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Circuitos integrados de gestión de baterías
Circuitos integrados para cargadores de baterías

BQ24745

NO RECOMENDADO PARA NUEVOS DISEÑOS

Cargador de batería reductor SMBus de hasta 4 celdas de nivel 2 compatible con varios tipos de bater

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BQ24745 no se recomienda para nuevos diseños
Este producto sigue estando disponible para los clientes existentes. Los nuevos diseños deben considerar un producto alternativo.
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Funcionalidad similar a la del dispositivo comparado
BQ24725A ACTIVO Controlador de carga de batería reductor SMBus de 1-4 celdas con selector MOSFET de potencia de cana This product is 1-4S Li+ Battery SBMus charger controller

BQ24745

NO RECOMENDADO PARA NUEVOS DISEÑOS
Hoja de datos Haga su pedido ahora

Detalles del producto

Number of series cells 2, 3, 4 Charge current (max) (A) 10 Vin (max) (V) 24 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 24 Absolute max Vin (max) (V) 30 Control topology Switch-Mode Buck Control interface SMBus Features Power Path Vin (min) (V) 7 Rating Catalog Operating temperature range (°C) 0 to 0
Number of series cells 2, 3, 4 Charge current (max) (A) 10 Vin (max) (V) 24 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 24 Absolute max Vin (max) (V) 30 Control topology Switch-Mode Buck Control interface SMBus Features Power Path Vin (min) (V) 7 Rating Catalog Operating temperature range (°C) 0 to 0
  • NMOS-NMOS Synchronous Buck Converter with
    300-kHz Frequency and >95% Efficiency
  • 30-ns Minimum Driver Dead-Time and
    99.5% Maximum Effective Duty Cycle
  • High-Accuracy Voltage and Current Regulation
    • ±0.5% Charge Voltage Accuracy
    • ±3% Charge Current Accuracy
    • ±3% Adapter Current Accuracy
    • ±2% Input Current Sense Amp Accuracy
  • Integration
    • Input Current Comparator, With Adjustable
      Threshold and Hysteresis
    • Internal Soft-Start
  • Safety
    • Dynamic Power Management (DPM)
  • Up to 19.2-V Battery Voltage
  • 7-V–24-V AC/DC-Adapter Operating Range
  • Simplified SMBus Control Interface
    • Charge Voltage DAC (1.024 V–19.2 V)
    • Charge Current DAC (128 mA–8.064 A)
    • Adapter Current Limit DPM DAC
      (256 mA–11.008 A)
  • Status and Monitoring Outputs
    • AC/DC Adapter Present With
      Adjustable Voltage Threshold
    • Input Current Comparator With Adjustable
      Threshold and Hysteresis
    • Current Sense Amplifier for Current Drawn
      From Input Source
  • Charge Any Battery Chemistry: Li+, NiCd,
    NiMH, Lead Acid, Etc.
  • Charge Enable Pin
  • < 10-µA Battery Current With Adapter Removed
  • < 1-mA Input DCIN Current With Adapter
    Present and Charge Disabled
  • 28-Pin, 5-mm × 5-mm QFN Package
  • NMOS-NMOS Synchronous Buck Converter with
    300-kHz Frequency and >95% Efficiency
  • 30-ns Minimum Driver Dead-Time and
    99.5% Maximum Effective Duty Cycle
  • High-Accuracy Voltage and Current Regulation
    • ±0.5% Charge Voltage Accuracy
    • ±3% Charge Current Accuracy
    • ±3% Adapter Current Accuracy
    • ±2% Input Current Sense Amp Accuracy
  • Integration
    • Input Current Comparator, With Adjustable
      Threshold and Hysteresis
    • Internal Soft-Start
  • Safety
    • Dynamic Power Management (DPM)
  • Up to 19.2-V Battery Voltage
  • 7-V–24-V AC/DC-Adapter Operating Range
  • Simplified SMBus Control Interface
    • Charge Voltage DAC (1.024 V–19.2 V)
    • Charge Current DAC (128 mA–8.064 A)
    • Adapter Current Limit DPM DAC
      (256 mA–11.008 A)
  • Status and Monitoring Outputs
    • AC/DC Adapter Present With
      Adjustable Voltage Threshold
    • Input Current Comparator With Adjustable
      Threshold and Hysteresis
    • Current Sense Amplifier for Current Drawn
      From Input Source
  • Charge Any Battery Chemistry: Li+, NiCd,
    NiMH, Lead Acid, Etc.
  • Charge Enable Pin
  • < 10-µA Battery Current With Adapter Removed
  • < 1-mA Input DCIN Current With Adapter
    Present and Charge Disabled
  • 28-Pin, 5-mm × 5-mm QFN Package

The bq24745 is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm × 5 mm QFN package.

The bq24745 features dynamic power management (DPM) and input power limiting. These features reduce battery-charge current when the input power limit is reached to avoid overloading the ac adaptor when supplying the load and the battery charger simultaneously. A highly accurate current-sense amplifier enables precise measurement of input current from the ac adapter, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its performance to the power available from the adapter. An integrated comparator monitors the input current through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold limit.

The bq24745 is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm × 5 mm QFN package.

The bq24745 features dynamic power management (DPM) and input power limiting. These features reduce battery-charge current when the input power limit is reached to avoid overloading the ac adaptor when supplying the load and the battery charger simultaneously. A highly accurate current-sense amplifier enables precise measurement of input current from the ac adapter, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its performance to the power available from the adapter. An integrated comparator monitors the input current through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold limit.
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Documentación técnica

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* Data sheet SMBus-Controlled Multi-chemistry Battery Charger With Input Current datasheet (Rev. D) 05 oct 2011

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje