USB-Friendly Li-Ion Battery Charger and Power-Path Management IC, 10.5V OVP - BQ24074

BQ24074 (ACTIVE)

USB-Friendly Li-Ion Battery Charger and Power-Path Management IC, 10.5V OVP

 

Description

The bq2407x series of devices are integrated Li-Ion linear chargers and system power path management devices targeted at space-limited portable applications. The devices operate from either a USB port or an AC adapter and support charge currents up to 1.5 A. The input voltage range with input overvoltage protection supports unregulated adapters. The USB input current limit accuracy and start up sequence allow the bq2407x to meet USB-IF inrush current specifications. Additionally, the input dynamic power management (VIN-DPM) prevents the charger from crashing incorrectly configured USB sources.

The bq2407x features dynamic power path management (DPPM) that powers the system while simultaneously and independently charging the battery. The DPPM circuit reduces the charge current when the input current limit causes the system output to fall to the DPPM threshold; thus, supplying the system load at all times while monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination and enables the system to run with a defective or absent battery pack.

Additionally, the regulated system input enables instant system turn-on when plugged in even with a totally discharged battery. The power-path management architecture also lets the battery supplement the system current requirements when the adapter cannot deliver the peak system currents, thus enabling the use of a smaller adapter.

The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded. The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The input current limit and charge current are programmable using external resistors.

Features

  • Fully Compliant USB Charger
    • Selectable 100-mA and 500-mA Maximum
      Input Current
    • 100-mA Maximum Current Limit Ensures
      Compliance to USB-IF Standard
    • Input-Based Dynamic Power Management
      (VIN-DPM) for Protection Against Poor USB
      Sources
  • 28-V Input Rating with Overvoltage Protection
  • Integrated Dynamic Power Path Management
    (DPPM) Function Simultaneously and
    Independently Powers the System and Charges
    the Battery
  • Supports up to 1.5-A Charge Current with
    Current Monitoring Output (ISET)
  • Programmable Input Current Limit up to 1.5 A for
    Wall Adapters
  • System Output Tracks Battery Voltage (bq24072)
  • Programmable Termination Current (bq24074)
  • Battery Disconnect Function with SYSOFF Input
    (bq24075, bq24079)
  • Programmable Pre-Charge and Fast-Charge
    Safety Timers
  • Reverse Current, Short-Circuit and Thermal
    Protection
  • NTC Thermistor Input
  • Proprietary Start-up Sequence Limits Inrush
    Current
  • Status Indication – Charging/Done, Power Good
  • APPLICATIONS
    • Smart Phones
    • Portable Media Players
    • Portable Navigation Devices
    • Low-Power Handheld Devices

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Parametrics Compare all products in Battery Charger IC

 
Number of Series Cells
Function
Cell Chemistry
Battery Charge Voltage (Min) (V)
Battery Charge Voltage (Max) (V)
Features
Charge Current (Max) (A)
Control Interface
Control Topology
Rating
Operating Temperature Range (C)
Pin/Package
Operating Vin (Min) (V)
Operating Vin (Max) (V)
Absolute Vin (safety rating) (Max) ((V))
BQ24074 BQ24072 BQ24073 BQ24075 BQ24079
1    1    1    1    1   
Charger    Charger    Charger    Charger    Charger   
Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer   
4.2    4.2    4.2    4.2    4.1   
4.2    4.2    4.2    4.2    4.1   
Power Path
Temp Monitoring (Thermistor Pin)
Vin DPM (OK for Solar Power Source)   
Power Path
Temp Monitoring (Thermistor Pin)
Vin DPM (OK for Solar Power Source)   
Power Path
Temp Monitoring (Thermistor Pin)
Vin DPM (OK for Solar Power Source)   
Power Path
Temp Monitoring (Thermistor Pin)
Vin DPM (OK for Solar Power Source)   
Power Path
Temp Monitoring (Thermistor Pin)
Vin DPM (OK for Solar Power Source)   
1.5    1.5    1.5    1.5    1.5   
Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)   
Linear    Linear    Linear    Linear    Linear   
Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   
16VQFN    16VQFN    16VQFN    16VQFN    16VQFN   
4.35    4.35    4.35    4.35    4.35   
10.2    6.4    6.4    6.4    6.4   
28    28    28    28    28   

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