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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

Number of series cells 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 Charge current (max) (A) 20 Vin (max) (V) 70 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH, SuperCap Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 70 Absolute max Vin (max) (V) 85 Control topology Switch-Mode Buck-boost Control interface I2C 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 Rating Catalog Operating temperature range (°C) -40 to 125
Number of series cells 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 Charge current (max) (A) 20 Vin (max) (V) 70 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH, SuperCap Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 70 Absolute max Vin (max) (V) 85 Control topology Switch-Mode Buck-boost Control interface I2C 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 Rating Catalog 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
EVM User's guide BQ25756 Evaluation Module User's Guide (Rev. C) PDF | HTML 18 Jun 2024
Technical article Designing an application to support a wide input voltage and battery voltage PDF | HTML 05 Jan 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
Certificate BQ25756EVM EU RoHS Declaration of Conformity (DoC) 21 Mar 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
MKST-3P-ALT-EV2300 — MKS Technology alternative for EV2300 communications transceiver
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
Hardware development
Evaluation board
BQ25756EVM — BQ25756 evaluation module for 1- to 14-cell bidirectional buck-boost battery charge controller
Download
Reference designs

PMP41062 — 100W integrated USB Type-C® and USB PD charging reference design for 4- to 10-cell batteries

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

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