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BQ25690

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Stand-alone or I²C-controlled 34V bidirectional buck-boost charger with power path

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Data sheet

BQ25690

ACTIVE
Data sheet Order now

Product details

Rating Catalog Number of series cells 1, 2, 3, 4, 5, 6, 7 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, SuperCap Charge current (max) (A) 3 Features BAT temp thermistor monitoring (JEITA profile), BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Integrated ADC, Power Path, Solar input/MPPT, USB C/PD compatible, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 2.5 Vin (max) (V) 34 Absolute max Vin (max) (V) 45 Control topology Switch-Mode Buck-boost Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 33 Control interface I2C, Standalone (RC-Settable) Operating temperature range (°C) -40 to 125
Rating Catalog Number of series cells 1, 2, 3, 4, 5, 6, 7 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, SuperCap Charge current (max) (A) 3 Features BAT temp thermistor monitoring (JEITA profile), BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Integrated ADC, Power Path, Solar input/MPPT, USB C/PD compatible, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 2.5 Vin (max) (V) 34 Absolute max Vin (max) (V) 45 Control topology Switch-Mode Buck-boost Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 33 Control interface I2C, Standalone (RC-Settable) Operating temperature range (°C) -40 to 125
WQFN-HR (RBA) 26 14 mm² 3.5 x 4
  • High integration buck-boost forward (sink) mode charger for 1- to 7cell Li-Ion batteries supporting USB PD profile with integrated switching MOSFETs and loop compensation
  • Highly efficient
    • Programmable switching frequency from 450kHz to 1.2MHz
    • Bypass mode for >98.0% efficiency USB-PD PPS direct battery charging at 20V, 3A
    • Selectable PFM with out-of-audio (OOA) operation for light load efficiency improvement
  • Supports a wide range of input sources with 2.5V to 34V operating range and 45V absolute maximum rating
    • Support VIN down to 2.5V with VBAT > 3.2V
    • USB-PD input
    • Input voltage dynamic power management (VINDPM) up to 34V to avoid input crashing
    • Optional input current dynamic power management (IINDPM) up-to 3.3A for maximum power limit
  • Optional Narrow voltage DC (NVDC) power path management
    • System instant-on with depleted or no battery
    • Battery supplements system when the adapter is fully loaded
  • I2C controlled for optimal system performance with resistor-programmable option
    • Hardware selectable default cell count, charge voltage, input and charge current limits
    • 3.3A charging current with 20mA resolution
  • Reverse/OTG (source) mode powers input port from battery
    • 3.5V to 34V reverse output voltage with 20mV resolution to support USB-PD PPS
    • Up-to 3.3A reverse output current regulation with 20mA resolution to support USB-PD PPS
  • Low quiescent current
    • 6.5µA for battery only operation
    • 700µA for converter switching operation
  • High accuracy
    • ±0.5% charge voltage regulation
    • ±5% input/output current regulation
  • Safety
    • Input and battery OVP
    • Thermal regulation and thermal shutdown
    • Converter MOSFETs OCP
    • Charging safety timer
  • High integration buck-boost forward (sink) mode charger for 1- to 7cell Li-Ion batteries supporting USB PD profile with integrated switching MOSFETs and loop compensation
  • Highly efficient
    • Programmable switching frequency from 450kHz to 1.2MHz
    • Bypass mode for >98.0% efficiency USB-PD PPS direct battery charging at 20V, 3A
    • Selectable PFM with out-of-audio (OOA) operation for light load efficiency improvement
  • Supports a wide range of input sources with 2.5V to 34V operating range and 45V absolute maximum rating
    • Support VIN down to 2.5V with VBAT > 3.2V
    • USB-PD input
    • Input voltage dynamic power management (VINDPM) up to 34V to avoid input crashing
    • Optional input current dynamic power management (IINDPM) up-to 3.3A for maximum power limit
  • Optional Narrow voltage DC (NVDC) power path management
    • System instant-on with depleted or no battery
    • Battery supplements system when the adapter is fully loaded
  • I2C controlled for optimal system performance with resistor-programmable option
    • Hardware selectable default cell count, charge voltage, input and charge current limits
    • 3.3A charging current with 20mA resolution
  • Reverse/OTG (source) mode powers input port from battery
    • 3.5V to 34V reverse output voltage with 20mV resolution to support USB-PD PPS
    • Up-to 3.3A reverse output current regulation with 20mA resolution to support USB-PD PPS
  • Low quiescent current
    • 6.5µA for battery only operation
    • 700µA for converter switching operation
  • High accuracy
    • ±0.5% charge voltage regulation
    • ±5% input/output current regulation
  • Safety
    • Input and battery OVP
    • Thermal regulation and thermal shutdown
    • Converter MOSFETs OCP
    • Charging safety timer

The BQ25690 is a fully integrated, switch-mode buck-boost charger for 1 cell to 7cell Li-ion or Li-polymer batteries. The wide input voltage range from 2.5V to 34V supports applications powered from batteries, standard USB-PD adapters, and high voltage dedicated DC adapters. The device integrates 4 switching MOSFETs (Q1, Q2, Q3, Q4) and all the loop compensation of the buck-boost converter for small solution size with simple design. The device 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. The device also supports the full input (sink) and output (reverse or source mode) voltage ranges for USB Type-C and USB power delivery (USB-PD) applications.

The BQ25690 is a fully integrated, switch-mode buck-boost charger for 1 cell to 7cell Li-ion or Li-polymer batteries. The wide input voltage range from 2.5V to 34V supports applications powered from batteries, standard USB-PD adapters, and high voltage dedicated DC adapters. The device integrates 4 switching MOSFETs (Q1, Q2, Q3, Q4) and all the loop compensation of the buck-boost converter for small solution size with simple design. The device 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. The device also supports the full input (sink) and output (reverse or source mode) voltage ranges for USB Type-C and USB power delivery (USB-PD) applications.
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* Data sheet BQ25690 Standalone/I2C Controlled, 1-7 cell Li-Ion, 3A Buck-Boost Bidirectional Battery Charger with Bypass datasheet (Rev. A) 16 Dec 2025

Design & development

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Evaluation board

BQ25690EVM — BQ25690 evaluation module

The BQ2569X/9X-Q1 evaluation module (EVM) is used to evaluate the BQ2569X/9X-Q1 integrated circuit. The BQ2569X/9X-Q1 is an integrated switched-mode buck-boost battery charge management device in HOTROD (QFN) package, intended for charging 1-series to 7-series cell Li chemistry batteries with up (...)
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BQ2569X-DESIGN-CALC — BQ2569X design spreadsheet

Excel spreadsheet to help with BQ2569X battery charger designs
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