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Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 6.45 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 4.2 Battery charge voltage (Max) (V) 4.2 Absolute Vin (safety rating) (Max) ((V)) 30 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, USB D+/D-/BC1.2 integrated, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3.5 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

WSON (DSQ) 10 4 mm² 2 x 2 open-in-new Find other Battery charger ICs

Features

  • Charging
    • 1% Charge Voltage Accuracy
    • 10% Charge Current Accuracy
    • Pin Selectable USB 100-mA and 500-mA
      Maximum Input Current Limit
    • Programmable Termination and Precharge
      Threshold
  • Protection
    • 30-V Input Rating; With 6.6-V Input
      Overvoltage Protection
    • Input Voltage Dynamic Power Management
    • 125°C Thermal Regulation; 150°C
      Thermal Shutdown Protection
    • OUT Short-Circuit Protection and ISETShort
      Detection
    • Operation Over JEITA Range Through Battery
      NTC – \xBD Fast-Charge-Current at Cold,
      4.06 V at Hot
    • Fixed 10-Hour Safety Timer
  • System
    • Auto Input Source Detection (D+, D– Pins)
      No Device Transceiver Required USB Friendly
    • Automatic Termination and Timer Disable Mode
      (TTDM) for Absent Battery Pack With Thermistor
    • Status Indication – Charging/Done
    • Available in Small 2-mm × 2-mm or
      2-mm × 3-mm Package
  • APPLICATIONS
    • Smart Phones
    • PDAs
    • MP3 Players
    • Low-Power Handheld Devices

All other trademarks are the property of their respective owners

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Description

The bq2405x series of devices are highly integrated Li-Ion and Li-Pol linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high-input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The bq2405x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10-hour safety timer.

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 an 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 precharge current and termination current threshold are programmed through an external resistor. The fast charge current value is also programmable through an external resistor.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet bq2405x 1-A, Single-Cell Li-Ion and Li-Pol Battery Charger With Automatic Adaptor and USB Detection datasheet (Rev. C) Dec. 11, 2014
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Application notes BQ2404x, BQ2405x, and BQ2409x Frequently Asked Questions Feb. 25, 2019
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Technical articles Summertime and the livin' is easy Jun. 20, 2014
Application notes Selecting the Best bq2404x/5x/9x Single Cell Battery Charger for your Applicatio Nov. 29, 2012
User guides 0.8-A, Single-Input, Single-Cell Li-Ion Battery Charger UG Sep. 29, 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

GERBER FILES Download
SLUC670.ZIP (350 KB)

CAD/CAE symbols

Package Pins Download
WSON (DSQ) 10 View options

Ordering & quality

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