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BQ25887

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I2C controlled, 2-cell, 2-A boost-mode battery charger with cell balancing

Data sheet
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I2C controlled, 2-cell, 2-A boost-mode battery charger with cell balancing

BQ25887

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Product details

Parameters

Number of series cells 2 Charge current (Max) (A) 2.2 Operating Vin (Max) (V) 6.2 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 6.8 Battery charge voltage (Max) (V) 9.2 Absolute Vin (safety rating) (Max) ((V)) 20 Control topology Switch-Mode Boost Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, ICO (Input Current Optimization), Input OVP, Integrated ADC, 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

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

Features

  • High-efficiency 2-A, 1.5-MHz switch mode boost charger
    • 93.4% Charge efficiency at 5-V adapter, 7.6-V battery, 1-A charge
    • Optimized for USB input and 2-cell Li-Ion battery
    • Selectable low power PFM mode for light load operation
  • Single input to support USB input adapters
    • Supports 3.9-V to 6.2-V input voltage range with 20-V absolute maximum input voltage rating
    • Input current limit (500 mA to 3.3 A with 100-mA resolution) to support USB2.0, USB3.0 standard adapters
    • Maximum power tracking by input voltage limit up-to 5.5 V
  • Cell balancing and I2C control
    • Integrated FETs for balancing current up to 400 mA
    • Automatic cell balancing with default register setting
  • Input current optimizer (ICO) to maximize input power without overloading adapters
  • Integrated 16-bit ADC for system monitoring (BUS voltage and current, each cell voltage, charge current, and NTC and die temperature)
  • High integration includes all MOSFETs, current sensing and loop compensation
  • High accuracy
    • ±0.5% Charge voltage regulation
    • ±5% Charge current regulation
    • ±7.5% Input current regulation
  • Safety
    • Battery temperature sensing in charge
    • Thermal regulation and thermal shutdown

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Description

The BQ25887 is a highly-integrated 2-A boost switch-mode battery charge management device for 2-cell (2s) Li-Ion and Li-polymer battery. The BQ25887 has I2C control with cell balancing for USB input.

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Technical documentation

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Type Title Date
* Datasheet BQ25887 I2C Controlled 2-Cell, 2-A Boost-Mode Battery Charger With Cell Balancing For USB Input datasheet (Rev. B) Nov. 03, 2019
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical articles 4 Reasons why you should use a boost charger for 2-cell battery application Apr. 03, 2019
Application notes USB charging solution for 2-cell (2S) discrete using BQ25887 with cell-balancing Mar. 28, 2019
User guides BQ25887 QFN boost-mode battery charger evaluation module Feb. 05, 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 BOARDS Download
document-generic User guide
99
Description
Charging 2-cell, 8.4-V battery from a legacy 5-V USB port requires a boost charger. The BQ25887 is a highly integrated 2-A boosting, 1.5-MHz switch-mode battery charge management with cell balancing for 2-s Li-ion and Li-polymer battery. The I2C serial interface with charging and cell balancing (...)
Features
  • Easily evaluate the high-efficiency 2-A, 1.5-MHz integrated field-effect-transistor (FET), switch-mode
  • Cell balancing feature to safely charge two discrete cells in series
  • Onboard USB input adapter for connecting to USB source and communication using the PSEL function to set default input current (...)
View details
INTERFACE ADAPTERS Download
document-generic User guide
199
Description

The EV2400 EVM interface board enables an IBM-compatible or other type PC (with the required driver for its particular platform) to communicate with the Texas Instruments SMBus or I2C interface gas gauges via a Universal Serial Bus (USB) port. In addition to this board, PC software is required to (...)

Features
  • Fully powered from the USB port
  • Optional 5-V port for powering high power voltage drivers (future upgrade)
  • Complete interface between the USB and SMBus, I2C (8/16) interfaces
  • Expansion port for future upgrades
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Package Pins Download
VQFN (RGE) 24 View options

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