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Product details

Parameters

Number of series cells 1, 2, 3, 4 Charge current (Max) (A) 5 Operating Vin (Max) (V) 24 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3 Battery charge voltage (Max) (V) 18.8 Absolute Vin (safety rating) (Max) ((V)) 30 Control topology Switch-Mode Buck-boost Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, Integrated LDO, Power Path, Solar input/MPPT, USB C/PD compatible, USB D+/D-/BC1.2 integrated, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3.6 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

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Features

  • High power density, high integration buck-boost charger for 1-4 cell batteries supporting any USB PD 3.0 profile
    • Integrates four switching MOSFETs, BATFET
    • Integrates input and charging current sensing
  • Highly efficient
    • 750-kHz or 1.5-MHz switching frequencies
    • charging current with 10-mA resolution
      • 97.5% converter efficiency charging 12V battery at 1.5A from 12V PV Panel input
  • Supports a wide range of input sources
    • MPPT algorithm for charging from small photovoltaic panel
    • 3.6-V to 24-V wide input operating voltage range with 30-V absolute maximum rating
    • Detects USB BC1.2, SDP, CDP, DCP, HVDCP and non-standard adapters
  • Dual-input power mux controller (optional)
  • Narrow voltage DC (NVDC) power path management
  • Powers USB port from battery (USB OTG)
    • OTG output voltage with 10-mV resolution to support USB-PD Programmable Power Supply
    • OTG output current regulation up to 3.32 A with 40-mA resolution
  • Flexible autonomous and I2C mode for optimal system performance
  • Integrated 16-bit ADC for voltage, current and temperature monitoring
  • Low battery quiescent current
    • 21-µA for battery only operation
    • 600 nA in charger shutdown mode
  • High accuracy
    • +0.65% to -0.85% charge voltage regulation for 2s-4s batteries
    • ±5% charge current regulation
    • ±5% input current regulation
  • Safety
    • Thermal regulation and thermal shutdown
    • Input/battery OVP and OCP
    • Converter MOSFETs OCP
    • Charging safety timer
  • Package
    • 29-Pin 4mm × 4mm QFN

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Description

The BQ25798 is a fully integrated switch-mode buck-boost charger for 1-4 cell Li-ion batteries and Li-polymer batteries. The integration includes 4 switching MOSFETs (Q1, Q2, Q3, Q4), input and charging current sensing circuits, the battery FET (QBAT) and all the loop compensation of the buck-boost converter. It uses NVDC power path management, regulating the system slightly above the battery voltage without dropping below a configurable minimum system voltage. When system power exceeds the input source rating, battery supplement mode supports the system without overloading the input source. BQ25798provides a simple interface to small photovoltaic panels using its built-in VOC scaling MPPT algorithm.

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Preproduction samples are available (PQ25798RQMT). Request now

Technical documentation

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Type Title Date
* Datasheet BQ25798 Buck-Boost Charger with Dual Input Selector for 1s~3s Battery datasheet Dec. 13, 2020
User guide BQ25792EVM, BQ25796EVM, and BQ25798EVM (BMS034) Evaluation Module (Rev. B) Dec. 04, 2020
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article 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
document-generic User guide
149
Description
The BQ25798EVM evaluation module (EVM) is used to evaluate the BQ25798 device. The BQ25798 is an integrated switched-mode buck-boost battery charge management device in HOTROD (QFN) package, intended for 1-series to 4-series cell Li-ion and Li-polymer batteries from 3.6-V to 24-V input with (...)
Features
  • Easily evaluate the high-efficiency 5-A switch-mode buck-boost charger in the HOTROD (QFN) package
  • Use of EV2400 or USB2ANY interface to switch between charge and USB On-the-Go (OTG) as well as monitor charger status and faults as well as voltages and current with an integrated analog-to-digital (...)

Software development

APPLICATION SOFTWARE & FRAMEWORK Download
GUI software for use with USB2ANY and battery charging evaluation modules
TI-CHARGER-GUI — The TI-CHARGER-GUI offers a web-based or standalone graphical user interface to assist in the process of evaluating, designing with, configuring or testing battery charger products. The software provides full access to registers and an easy interface to send and sequence commands.
Features
  • Web-based or standalone GUI with easy to follow graphic instructions
  • Configures supported battery charger evaluation modules (EVMs) through USB2ANY interface adaptor
  • Easy to navigate pages organized by functional groupings
  • Supports sequenced I2C or SMBus commands

CAD/CAE symbols

Package Pins Download
VQFN-HR (RQM) 29 View options

Ordering & quality

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  • Ongoing reliability monitoring

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