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BQ25756

ACTIVE

Stand-alone or I²C-controlled 70-V bidirectional buck-boost charge controller with MPPT

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Data sheet

BQ25756

ACTIVE
Data sheet Order now

Product details

Rating Catalog Number of series cells 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH, SuperCap Charge current (max) (A) 20 Features Adjustable switching frequency, BAT temp thermistor monitoring (JEITA profile), Bidirectional, IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, Integrated LDO, SYNC Pin, Solar input/MPPT, USB C/PD compatible, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 4.2 Vin (max) (V) 70 Absolute max Vin (max) (V) 85 Control topology Switch-Mode Buck-boost Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 70 Control interface I2C Operating temperature range (°C) -40 to 125
Rating Catalog Number of series cells 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH, SuperCap Charge current (max) (A) 20 Features Adjustable switching frequency, BAT temp thermistor monitoring (JEITA profile), Bidirectional, IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, Integrated LDO, SYNC Pin, Solar input/MPPT, USB C/PD compatible, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 4.2 Vin (max) (V) 70 Absolute max Vin (max) (V) 85 Control topology Switch-Mode Buck-boost Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 70 Control interface I2C Operating temperature range (°C) -40 to 125
VQFN (RRV) 36 30 mm² 6 x 5
  • Wide input voltage operating range: 4.2 V to 70 V
  • Wide battery voltage operating range: up-to 70 V with multi-chemistry support:
    • 1- to 14-cell Li-ion charge profile
    • 1- to 16-cell LiFePO 4 charge profile
  • Synchronous buck-boost charge controller with NFET drivers
    • Adjustable switching frequency from 200 kHz to 600 kHz
    • Optional synchronization to external clock
    • Integrated loop compensation with soft start
    • Optional gate driver supply input for optimized efficiency
  • Automatic maximum power point tracking (MPPT) for solar charging
  • Buck-only mode
  • Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)
    • Adjustable input voltage (VAC) regulation from 3.3 V to 65 V with 20-mV/step
    • Adjustable input current regulation (R AC_SNS) from 400 mA to 20 A with 50-mA/step using 5-mΩ resistor
  • High accuracy
    • ±0.5% charge voltage regulation
    • ±3% charge current regulation
    • ±3% input current regulation
  • I 2C controlled for optimal system performance with resistor-programmable option
    • Hardware adjustable input and output current limits
  • Integrated 16-bit ADC for voltage, current, and temperature monitoring
  • High safety integration
    • Adjustable input overvoltage and undervoltage protection
    • Battery overvoltage and overcurrent protection
    • Charging safety timer
    • Battery short protection
    • Thermal shutdown
  • Status outputs
    • Adapter present status ( PG)
    • Charger operation status (STAT1, STAT2)
  • Package
    • 36-pin 5 mm × 6 mm QFN
  • Wide input voltage operating range: 4.2 V to 70 V
  • Wide battery voltage operating range: up-to 70 V with multi-chemistry support:
    • 1- to 14-cell Li-ion charge profile
    • 1- to 16-cell LiFePO 4 charge profile
  • Synchronous buck-boost charge controller with NFET drivers
    • Adjustable switching frequency from 200 kHz to 600 kHz
    • Optional synchronization to external clock
    • Integrated loop compensation with soft start
    • Optional gate driver supply input for optimized efficiency
  • Automatic maximum power point tracking (MPPT) for solar charging
  • Buck-only mode
  • Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)
    • Adjustable input voltage (VAC) regulation from 3.3 V to 65 V with 20-mV/step
    • Adjustable input current regulation (R AC_SNS) from 400 mA to 20 A with 50-mA/step using 5-mΩ resistor
  • High accuracy
    • ±0.5% charge voltage regulation
    • ±3% charge current regulation
    • ±3% input current regulation
  • I 2C controlled for optimal system performance with resistor-programmable option
    • Hardware adjustable input and output current limits
  • Integrated 16-bit ADC for voltage, current, and temperature monitoring
  • High safety integration
    • Adjustable input overvoltage and undervoltage protection
    • Battery overvoltage and overcurrent protection
    • Charging safety timer
    • Battery short protection
    • Thermal shutdown
  • Status outputs
    • Adapter present status ( PG)
    • Charger operation status (STAT1, STAT2)
  • Package
    • 36-pin 5 mm × 6 mm QFN

The BQ25756 is a wide input voltage, switched-mode buck-boost Li-Ion, Li-polymer, or LiFePO 4 battery charge controller with bidirectional power flow support. The device offers high-efficiency battery charging over a wide voltage range with accurate charge current and charge voltage regulation, in addition to automatic charge preconditioning, termination, and charge status indication. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density solution with ease of use. In reverse mode, the device draws power from the battery and regulates the input terminal voltage with an added constant current loop for protection, supporting USB-PD EPR power profile.

Besides the I 2C host-controlled charging mode, the device also supports standalone charging mode via resistor programmable limits. Input current, charge current and charge voltage regulation targets can be set via the ILIM_HIZ, ICHG and FB pins, respectively.

The BQ25756 is a wide input voltage, switched-mode buck-boost Li-Ion, Li-polymer, or LiFePO 4 battery charge controller with bidirectional power flow support. The device offers high-efficiency battery charging over a wide voltage range with accurate charge current and charge voltage regulation, in addition to automatic charge preconditioning, termination, and charge status indication. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density solution with ease of use. In reverse mode, the device draws power from the battery and regulates the input terminal voltage with an added constant current loop for protection, supporting USB-PD EPR power profile.

Besides the I 2C host-controlled charging mode, the device also supports standalone charging mode via resistor programmable limits. Input current, charge current and charge voltage regulation targets can be set via the ILIM_HIZ, ICHG and FB pins, respectively.
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Technical documentation

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Type Title Date
* Data sheet BQ25756: Standalone/I2C Controlled, 1- to 14-Cell Bidirectional Buck-Boost Battery Charge Controller datasheet PDF | HTML 25 Aug 2023
Application note MOSFET Selection Guide for BQ2575x Family PDF | HTML 13 Jun 2025
Application note How To Implement External P&O Feature On BQ2575X PDF | HTML 16 May 2025
Certificate BQ25756EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) 10 Jan 2025
Application note How to Connect the BQ25756 EVM to the TPS26750 EVM and Initiate USB Type C EPR PDF | HTML 21 Nov 2024
Technical article USB Type-C® 與 USB 電力輸送：專為延伸功率範圍和電池供電系統進行設計 (Rev. A) PDF | HTML 28 Oct 2024
Technical article USB Type-C® 및 USB Power Delivery: 확장 전력 범위 및 배터리 구동 시스템 모두를 위한 설계 (Rev. A) PDF | HTML 28 Oct 2024
Technical article USB Type-C® and USB Power Delivery: Designing for both Extended Power Range and battery-powered systems (Rev. A) PDF | HTML 14 Oct 2024
Application note Charging LiFePO4 Battery And Supercapacitor Using BQ25756 PDF | HTML 19 Dec 2023
White paper Designing a Battery Charging System for Diversifying Applications PDF | HTML 05 Dec 2023
White paper 設計適合多樣化應用的電池充電系統 PDF | HTML 05 Dec 2023
White paper 다양한 애플리케이션을 위한 배터리 충전 시스템 설계 PDF | HTML 05 Dec 2023
Technical article Designing an application to support a wide input voltage and battery voltage PDF | HTML 23 Nov 2023

Design & development

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

Evaluation board

BQ25756EVM — BQ25756 evaluation module for 1- to 14-cell bidirectional buck-boost battery charge controller

The BQ25756EVM evaluation module (EVM) is a
complete evaluation system for the BQ25756 IC, a
buck-boost battery charge controller with a wide input
range of 4.2V - 70V, a wide output voltage range of up
to 70V, and bi-directional capabilities.
The BQ25756EVM has a max input and output of 55V
and a (...)

User guide: PDF | HTML
Not available on TI.com
Application software & framework

BQSTUDIO-TEST — Battery Management Studio (bqStudio) Software – Beta version downloads

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
  • BQ76905 — Low-power monitor and protector for 2S to 5S with high accuracy cell voltage measurement
  • BQ76907 — Low-power monitor and protector for 2S to 7S with high accuracy cell voltage measurement
  • BQ769142 — 3-s to 14-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4 battery
  • BQ76942 — 3-series to 10-series multicell battery monitor and protector
  • BQ76952 — 3-s to 16-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4
  • BQ76972 — 3s-to-16s high-accuracy battery monitor and protector for Li-ion, Li-poly and LiFePO4
Battery charger ICs
  • BQ24800 — SMBus 1-4 cell Buck battery charge controller to support hybrid power boost and battery boost mode
  • BQ25720 — SMBus 1- to 4-cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG
  • BQ25723 — I²C 1-4 cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG
  • BQ25731 — I2C 1-5 cell NVDC buck-boost battery charge controller with USB type-C PD support
  • BQ25756 — Stand-alone or I²C-controlled 70-V bidirectional buck-boost charge controller with MPPT
  • BQ25790 — Integrated, NVDC, 5-A 1-cell to 4-cell switch-mode buck-boost battery charger
  • BQ25792 — I2C controlled, 5-A, 1-4 cell buck-boost charger with dual-input selector and USB PD 3.0 OTG output
Battery fuel gauges
  • BQ27220 — Single cell pack/system-side CEDV battery fuel (gas) gauge w/pre-programmed chemistry profiles
  • BQ27320 — Single cell pack/System-side CEDV battery fuel (gas) gauge
  • BQ27425-G1 — System-side Impedance Track™; fuel gauge with direct battery connection | gas gauge battery
  • BQ27425-G2A — System-side Impedance Track™; fuel gauge for LiCoO2 battery
  • BQ27425-G2B — System-side Impedance Track™; fuel gauge LiMn2O4 battery
  • BQ27427 — Single-cell battery fuel gauge with pre-programmed chemistry and integrated sense resistor
  • BQ27520-G4 — System side Impedance Track™ fuel gauge with integrated LDO.
  • BQ27530-G1 — System-side Impedance-Track fuel (gas) gauge with direct battery connection
  • BQ27531-G1 — Battery management unit Impedance Track™ fuel (gas) gauge for bq2419x charger controller
  • BQ27532-G1 — Battery management unit Impedance Track™ fuel gauge for bq2425x charger
  • BQ27545-G1 — Single cell, pack side, Impedance Track™ fuel gauge
  • BQ27546-G1 — Single cell Impedance Track™ pack side fuel gauge with DSBGA package
  • BQ27621-G1 — System-side fuel gauge with Dynamic Voltage Correlation, battery gas gauge
  • BQ27741-G1 — Pack-side Impedance Track™(tm) fuel (gas) gauge with integrated protector
  • BQ27742-G1 — Single cell Li-ion battery fuel gauge with integrated protection | battery gas gauge
  • BQ27Z561 — Impedance Track™ integrated circuit gas gauge solution for 1-series
  • BQ27Z746 — Pack-side, single-cell Impedance Track™ technology fuel gauge with integrated protector
  • BQ28Z610 — Battery fuel gauge with integrated protector for 1-2 series packs
  • BQ34110 — Multi-chemistry high-cell Count battery fuel gauge with integrated rarely discharged module
  • BQ34210-Q1 — Automotive Qualified Single cell system-side CEDV fuel gauge
  • BQ34Z100-G1 — Multi-chemistry Impedance Track™ standalone fuel gauge | battery gas gauge
  • BQ35100 — Battery fuel gauge for non-rechargeable batteries (lithium primary) and end-of-service monitor
  • BQ4050 — 1-4 series CEDV battery fuel (gas) gauge
  • BQ40Z50 — 1-4 series Li-ion battery pack manager | battery fuel (gas) gauge
  • BQ40Z50-R1 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 1.0
  • BQ40Z50-R2 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0
  • BQ40Z60 — Complete multi-cell battery manager | battery fuel (gas) gauge
  • BQ40Z80 — 2-s to 6-s battery pack manager with Impedance Track™ gas gauging
  • BQ78350 — Companion CEDV Fuel Gauge Battery Management Controller for bq76940 Monitor Family
  • BQ78350-R1 — CEDV li-ion gas gauge and battery management controller
  • BQ78Z100 — Impedance Track™ battery fuel (gas) gauge for 1-series to 2-series
Battery protectors
  • BQ77307 — Low-power protector for 2S to 7S with high accuracy cell voltage measurement
Hardware development
Evaluation board
Download options
Application software & framework

TI-CHARGER-GUI — GUI software for use with USB2ANY & battery charging evaluation modules

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.
Evaluate in the cloud
Calculation tool

BQ25756-DESIGN-CALC — BQ25756 design calculator

BQ25756 design calculator is a calculation tool for BQ25756 which is a wide input voltage, switched mode buck-boost Li-Ion, Li-polymer, or LiFePO4 battery charge controller with bidirectional power flow support.
Supported products & hardware

Supported products & hardware

Products
Battery charger ICs
  • BQ25756 — Stand-alone or I²C-controlled 70-V bidirectional buck-boost charge controller with MPPT
  • BQ25758 — I²C controlled 60-V bi-directional buck-boost controller with USB PD EPR and PPS support
  • BQ25756E — Stand-alone or I²C-controlled bidirectional buck-boost charge controller for up to 7S batteries
  • BQ25856-Q1 — Automotive I2C controlled 70-V bidirectional buck-boost charge controller
  • BQ25758A — I²C controlled 60V bi-directional buck-boost controller with USB PD EPR and PPS support
  • BQ25750 — Stand-alone or I²C-controlled 70-V bidirectional buck-boost charge controller with power path
  • BQ25858-Q1 — Automotive stand-alone or I²C controlled 70V bidirectional buck-boost controller
  • BQ25858B-Q1 — Automotive stand-alone or I²C controlled 70V bidirectional buck-boost controller
  • BQ25751 — Stand-alone or I²C controlled, 70V, buck-boost, lead acid battery charge controller with power path
  • BQ25820 — Stand-alone or I²C controlled 70V bidirectional buck charge controller with power path
  • BQ25758S — I²C controlled 32V bidirectional buck-boost controller with USB PD EPR and PPS support
  • BQ25822 — 70V bidirectional buck charge controller with power path and automatic backup mode
Hardware development
Evaluation board
  • BQ25756EVM — BQ25756 evaluation module for 1- to 14-cell bidirectional buck-boost battery charge controller
Download
Reference designs

PMP41115 — 240W integrated USB Type-C and USB PD3.1 charger reference design

This reference design is an integrated USB Type-C and USB power delivery (PD) charger for 10 to 12 cell batteries for applications such as e-bikes, high-capacity power banks, and portable power station applications. The design incorporates USB PD3.1 controllers TPS26750 and TPD4S480, a 48V extended (...)
Test report: PDF
Reference designs

PMP41062 — 100W integrated USB Type-C® and USB power delivery bidirectional charging reference design

This reference design is an integrated USB Type-C® power delivery (PD) and charging reference design for 4- to 10-cell batteries for applications such as, power tool charger with USB Type-C port, vacuum cleaners, portable power station and more. Using the TPS25751, a highly integrated USB (...)
Test report: PDF
Reference designs

PMP41083 — 100W integrated USB Type-C® and USB PD charging reference design for 4- to 10-cell batteries

This reference design provides a 100-W charging power for 4- to 10-cell batteries with USB Type-C® power delivery (PD). The design features an integrated power path switch and a simplified GUI to configure the power specification depending on the user's application. The battery charger (...)
Test report: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RRV) 36 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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