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Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 3 Operating Vin (Max) (V) 6.2 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 3.5 Battery charge voltage (Max) (V) 4.44 Absolute Vin (safety rating) (Max) ((V)) 15 Control topology Switch-Mode Buck Control interface I2C Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Power Path, USB OTG integrated Operating Vin (Min) (V) 3.9 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

VQFN (RGE) 24 16 mm² 4 x 4 open-in-new Find other Battery charger ICs

Features

  • 90% High Efficiency Switch Mode 3-A Charger
  • 3.9-V to 6.2-V Single Input USB-Compliant Charger with 6.4-V Over-Voltage Protection
    • USB Host or Charging Port D+/D– Detection Compatible to USB Battery Charger Spec (BC1.2)
    • Supports Nonstandard 2-A/1-A Adapters Detection (bq24297)
    • Input Voltage and Current Limit Supports USB 2.0 and USB 3.0
    • Input Current Limit: 100 mA, 150 mA, 500 mA, 900 mA, 1 A, 1.5 A, 2 A, and 3 A
  • USB OTG with Adjustable Output 4.55 V to 5.5 V at 1 A or 1.5 A
    • Fast OTG Startup (22 ms Typ)
    • 90% 5-V Boost Mode Efficiency
    • Accurate ±15% Hiccup Mode Over-Current Protection
  • Narrow VDC (NVDC) Power Path Management
    • Instant System On with No Battery or Deeply Discharged Battery
    • Ideal Diode Operation in Battery Supplement Mode
  • 1.5-MHz Switching Frequency for Low Profile 1.2-mm Inductor
  • I2C Port for Optimal System Performance and Status Reporting
  • Autonomous Battery Charging With or Without Host Management
    • Battery Charge Enable and Preconditioning
    • Charge Termination and Recharge
  • High Accuracy
    • ±0.5% Charge Voltage Regulation
    • ±7% Charge Current Regulation
    • ±7.5% Input Current Regulation
    • ±3% Output Voltage Regulation in USB OTG Boost Mode
  • High Integration
    • Power Path Management
    • Synchronous Switching MOSFETs
    • Integrated Current Sensing
    • Bootstrap Diode
    • Internal Loop Compensation
  • Safety
    • Battery Temperature Sensing for Charging and Discharging in OTG Mode
    • Battery Charging Safety Timer
    • Thermal Regulation and Thermal Shutdown
    • Input and System Over-Voltage Protection
    • MOSFET Over-Current Protection
  • Charge Status Outputs for LED or Host Processor
  • Maximum Power Tracking Capability by Input Voltage Regulation
  • 20-µA Low Battery Leakage Current and Support Shipping Mode
  • 4.00-mm × 4.00-mm VQFN-24 Package
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Description

The bq24296/bq24297 are highly-integrated switch-mode battery charge management and system power path management devices for 1 cell Li-Ion and Li-polymer batteries in a wide range of smart phone and tablet applications.

Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charge time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

The device supports 3.9-V to 6.2-V USB input sources, including standard USB host port and USB charging port with 6.4-V over-voltage protection. The device is compliant with USB 2.0 and USB 3.0 power specifications with input current and voltage regulation. To set the default input current limit, the bq24296 takes the result from the detection circuit in the system, such as USB PHY device and the bq24297 detects the input source through D+/D– detection following the USB battery charging spec 1.2. In addition, the bq24297 detects non-standard 2-A/1-A adapters. The device also supports USB On-the-Go operation by providing fast startup and supplying adjustable voltage 4.55-V to 5.5-V (default 5 V) on the VBUS with an accurate current limit up to 1.5 A.

The power path management regulates the system slightly above battery voltage but does not drop below 3.5-V minimum system voltage (programmable). With this feature, the system keeps operating even when the battery is completely depleted or removed. When the input source current or voltage limit is reached, the power path management automatically reduces the charge current to zero and then starts discharges the battery until the system power requirement is met. This supplement mode operation keeps the input source from getting overloaded.

The device initiates and completes a charging cycle when host control is not available. It automatically charges the battery in three phases: pre-conditioning, constant current, and constant voltage. In the end, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase. Later on, when the battery voltage falls below the recharge threshold, the charger automatically starts another charging cycle.

The charge device provides various safety features for battery charging and system operation, including negative thermistor monitoring, charging safety timer, and over-voltage/over-current protections. The thermal regulation reduces charge current when the junction temperature exceeds 120°C (programmable).

The STAT output reports the charging status and any fault conditions. The INT immediately notifies the host when a fault occurs.

The bq24296 and bq24297 are available in a 24-pin, 4.00 × 4.00 mm2 thin VQFN package.

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Technical documentation

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Type Title Date
* Data sheet bq2429x I2C Controlled 3-A Single Cell USB Charger With Narrow VDC Power Path Management and Adjustable Voltage USB OTG datasheet (Rev. C) Dec. 30, 2016
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Higher charger input-voltage ratings: better safe than sorry Jul. 20, 2016
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
More literature Battery Management Solutions for Point of Sale Systems Aug. 18, 2014
Technical article Summertime and the livin' is easy Jun. 20, 2014
User guide bq24296 and bq24297 EVM (PWR021) User’s Guide Aug. 28, 2013

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
99
Description

I2C Controlled 2.5A Single Cell Charger with Narrow VDC Power Path Management; Default Setting (BATREG = 4.208, ICHG = 2.5A, VINDPM = 4.36V) and USB OTG

The BQ24296EVM-021 requires USB Interface Adaptive Evaluation Module “USB-TO-GPIO” for I2C interface. If one is not already available to (...)

Features
  • Up to 5.5A fast charge rate
  • Single Input USB-compliant charger
  • Instant-on works with no battery or deeply discharged battery
  • Narrow system bus voltage power path management
  • I2C port for optimal system performance and status information
  • 1.5MHz switching frequency
  • Program input current limit
  • Battery (...)

Software development

SUPPORT SOFTWARE Download
SLUC495.ZIP (539 KB)

Reference designs

REFERENCE DESIGNS Download
I2C Controlled Single Cell USB NVDC 3A Charger with 1.5A Synchronous OTG Boost
TIDA-00280 TIDA-00280 is an evaluation module for fully-integrated single-cell NVDC 3A charger bq24296/bq24297 with 1.5A synchronous boost operation. This board could be used to evaluate the performance of USB detection, the flexibility to change the charging profile and OTG operation. The two charger ICs are (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RGE) 24 View options

Ordering & quality

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