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BQ25756E

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Stand-alone or I²C-controlled bidirectional buck-boost charge controller for up to 7S batteries

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Data sheet

BQ25756E

ACTIVE
Data sheet Order now

Product details

Number of series cells 1, 2, 3, 4, 5, 6, 7 Charge current (max) (A) 20 Vin (max) (V) 60 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH, SuperCap Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 36 Absolute max Vin (max) (V) 60 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) 0 Rating Catalog Operating temperature range (°C) -40 to 125
Number of series cells 1, 2, 3, 4, 5, 6, 7 Charge current (max) (A) 20 Vin (max) (V) 60 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH, SuperCap Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 36 Absolute max Vin (max) (V) 60 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) 0 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 36 V
  • Wide battery voltage operating range: up-to 36 V with multi-chemistry support:
    • 1- to 7-cell Li-ion charge profile
    • 1- to 9-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
  • Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)
    • Adjustable input voltage (VAC) regulation from 3.3 V to 36 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 36 V
  • Wide battery voltage operating range: up-to 36 V with multi-chemistry support:
    • 1- to 7-cell Li-ion charge profile
    • 1- to 9-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
  • Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)
    • Adjustable input voltage (VAC) regulation from 3.3 V to 36 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 BQ25756E 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 limit 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 BQ25756E 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 limit 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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Type Title Date
* Data sheet BQ25756E: Standalone/I2C Controlled, 1- to 7-Cell Bidirectional Buck-Boost Battery Charge Controller datasheet PDF | HTML 28 Nov 2023
EVM User's guide BQ25756E Evaluation Module User's Guide PDF | HTML 17 Nov 2023
Certificate BQ25756EEVM EU Declaration of Conformity (DoC) 31 Oct 2023

Design & development

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

Evaluation board

BQ25756EEVM — BQ25756E evaluation module for stand-alone or I²C-controlled bidirectional buck-boost controller

The BQ25756EEVM evaluation module (EVM) is a complete evaluation system for BQ25756E, a bidirectional charge controller with a wide input and output voltage range of up to 36 V. The device offers high-efficiency battery charging over a wide voltage range with output CC-CV control. The device (...)
User guide: PDF | HTML
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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
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Package Pins Download
VQFN (RRV) 36 View options
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