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Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 3 Operating Vin (Max) (V) 13.5 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.5 Battery charge voltage (Max) (V) 4.52 Absolute Vin (safety rating) (Max) ((V)) 22 Control topology Switch-Mode Buck Control interface I2C Features BAT temp thermistor monitoring (hot/cold profile), Input OVP, Power Path, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3.9 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

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

Features

  • High-efficiency, 1.5-MHz, synchronous switch-mode buck charger
    • 92% charge efficiency at 2-A from 5-V input
    • ±0.4% charge voltage regulation with 10-mV step
    • Programmable JEITA thresholds
    • Remote battery sensing to charge faster
  • Support USB On-The-Go (OTG) with adjustable output from 4.6 V to 5.15 V
    • Boost converter with up to 1.2-A output
    • 92% boost efficiency at 1-A output
    • Accurate constant current (CC) limit
    • Soft-start up to 500-µF capacitive load
  • Single input supporting USB input, high-voltage adapter, or wireless power
    • Support 4-V to 13.5-V input voltage range with 22-V absolute max input rating
    • 130-ns fast turn-off input over voltage protection
    • Programmable input current limit (IINDPM) with I2C (100-mA to 3.2-A, 100-mA/step)
    • VINDPM threshold up to 5.4-V automatically tracks battery voltage for maximum power
    • Auto detect USB SDP, CDP, DCP and non-standard adaptors
  • Narrow VDC (NVDC) power path management
    • System instant-on with no battery or deeply discharged battery
  • Low RDSON 19.5-mΩ BATFET to minimize charging loss and extend battery run time
    • BATFET control for ship mode, and full system reset with and without adapter
  • 7-µA low battery leakage current in ship mode
  • 9.5-µA low battery leakage current with system standby
  • High accuracy battery charging profile
    • ±6% charge current regulation
    • ±7.5% input current regulation
    • ±3% VINDPM voltage regulation
    • Programmable top-off timer for full battery charging
  • High integration includes all MOSFETs, current sensing and loop compensation
  • Safety-Related Certifications:
    • IEC 62368-1 CB Certification

All trademarks are the property of their respective owners.

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Description

The BQ25611D is a highly integrated 3-A switch-mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer batteries. The solution is highly integrated with input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery run time during discharging phase.

The BQ25611D is a highly integrated 3-A switch-mode battery charge management and system Power Path management device for Li-ion and Li-polymer batteries. It features fast charging with high input voltage support for a wide range of applications including smart phones and tablets . Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time, and extends battery run time during discharging phase. Its input voltage and current regulation and battery remote sensing deliver maximum charging power to the battery.

The solution is highly integrated with input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. It also integrates the bootstrap diode for the high-side gate drive for simplified system design. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

The device supports a wide range of input sources, including standard USB host port, USB charging port, USB compliant high voltage adapter and wireless power. It is compliant with USB 2.0 and USB 3.0 power spec with input current and voltage regulation. The device takes the result from the detection circuit in the system, such as USB PHY device.

The device integrates the buck charger and boost regulator into one solution with single inductor. It meets USB On-The-Go (OTG) operation power rating specification by supplying 5 V (adjustable 4.6V / 4.75 V / 5 V / 5.15 V) with constant current limit up to 1.2 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 adapter applied. With this feature, the system maintains operation even when the battery is completely depleted or removed. When the input current limit or voltage limit is reached, the Power Path management automatically reduces the charge current. As the system load continues to increase, the battery starts to discharge the battery until the system power requirement is met. This supplement mode prevents overloading the input source.

The device initiates and completes a charging cycle without software control. It senses the battery voltage and charges the battery in three phases: pre-conditioning, constant current and constant voltage. At the end of the charging cycle, the charger automatically terminates when the charge current is below a preset limit and the battery voltage is higher than the recharge threshold. If the fully charged battery falls below the recharge threshold, the charger automatically starts another charging cycle.

The charger provides various safety features for battery charging and system operations, including battery negative temperature coefficient thermistor monitoring, charging safety timer and overvoltage and over-current protections. Thermal regulation reduces charge current when the junction temperature exceeds 110°C. The status register reports the charging status and any fault conditions. With I2C, the VBUS_GD bit indicates if a good power source is present, and the INT output immediately notifies host when a fault occurs.

The device also provides the QON pin for BATFET enable and reset control to exit low power ship mode or full system reset function.

The BQ25611D device is available in 24-pin, 4 mm × 4 mm x 0.75 mm thin WQFN package.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet BQ25611D I2C Controlled 1-Cell 3.0-A Buck Battery Charger With USB Detection datasheet (Rev. B) Sep. 14, 2020
User guide BQ25611D, BQ25619 (BMS025) Evaluation Module User's Guide (Rev. B) Oct. 18, 2019
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 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

Design & development

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

Hardware development

EVALUATION BOARD Download
99
Description
The BQ25611DEVM evaluation module (EVM) is designed to evalute the BQ25611D device. The BQ25611D device is a 3-A single-cell battery charger optimized for power bank applications in low power portable designs. The OTG reverse synchronous boost operation and forward buck mode operation allows (...)
Features
  • 92% charge efficiency at 2 A from 5-V input and 92% boost efficiency at 1-A output
  • Output short circuit protection and soft-start up to 500-µF capacitive load in OTG mode
  • 10-µA low battery leakage current with system voltage standby 3-µA low battery leakage current in ship mode
  • BATFET control to support (...)

CAD/CAE symbols

Package Pins Download
WQFN (RTW) 24 View options

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