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BQ25620

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I²C controlled 1-cell 3.5-A buck battery charger with 18-V max input, integrated ADC and OTG output

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Data sheet

BQ25620

ACTIVE
Data sheet Order now

Product details

Number of series cells 1 Charge current (max) (A) 3.5 Vin (max) (V) 18 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (min) (V) 3.5 Battery charge voltage (max) (V) 4.8 Absolute max Vin (max) (V) 26 Control topology Switch-Mode Buck Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IINDPM (Input current limit), Input OVP, Integrated ADC, Integrated LDO, Power Path, USB C/PD compatible, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 3.9 Rating Catalog Operating temperature range (°C) -40 to 85
Number of series cells 1 Charge current (max) (A) 3.5 Vin (max) (V) 18 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (min) (V) 3.5 Battery charge voltage (max) (V) 4.8 Absolute max Vin (max) (V) 26 Control topology Switch-Mode Buck Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IINDPM (Input current limit), Input OVP, Integrated ADC, Integrated LDO, Power Path, USB C/PD compatible, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 3.9 Rating Catalog Operating temperature range (°C) -40 to 85
WQFN-HR (RYK) 18 7.5 mm² 2.5 x 3
  • High-efficiency, 1.5-MHz, synchronous switching mode buck charger for single cell battery
    • >90% efficiency down to 25-mA output current from 5-V input
    • Charge termination from 10 mA to 620 mA, 10-mA steps
    • Flexible JEITA profile for safe charging over temperature
  • BATFET control to support shutdown, ship mode and full system reset
    • 1.5-µA quiescent current in battery only mode
    • 0.15-µA battery leakage current in ship mode
    • 0.1-µA battery leakage current in shutdown
  • Supports USB On-The-Go (OTG)
    • Boost mode operation supporting 3.84-V to 9.6-V output
    • >90% boost efficiency down to 100-mA OTG current for 5-V VBUS
  • Supports a wide range of input sources
    • 3.9-V to 18-V wide input operating voltage range with 26-V absolute maximum input voltage
    • Maximizes source power with input voltage regulation (VINDPM) and input current regulation (IINDPM)
    • VINDPM threshold automatically tracks battery voltage
  • Efficient battery operation with 15-mΩ BATFET
  • Narrow VDC (NVDC) power path management
    • System instant-on with depleted or no battery
    • Battery supplement when adapter is fully loaded
  • Flexible autonomous or I2C-controlled modes
  • Integrated 12-bit ADC for voltage, current, temperature monitoring
  • High accuracy
    • ±0. 5% charge voltage regulation
    • ±5% charge current regulation
    • ±5% input current regulation
  • Safety
    • Thermal regulation and thermal shutdown
    • Input, system, battery overvoltage protection
    • Battery, converter overcurrent protection
    • Charging safety timer
  • High-efficiency, 1.5-MHz, synchronous switching mode buck charger for single cell battery
    • >90% efficiency down to 25-mA output current from 5-V input
    • Charge termination from 10 mA to 620 mA, 10-mA steps
    • Flexible JEITA profile for safe charging over temperature
  • BATFET control to support shutdown, ship mode and full system reset
    • 1.5-µA quiescent current in battery only mode
    • 0.15-µA battery leakage current in ship mode
    • 0.1-µA battery leakage current in shutdown
  • Supports USB On-The-Go (OTG)
    • Boost mode operation supporting 3.84-V to 9.6-V output
    • >90% boost efficiency down to 100-mA OTG current for 5-V VBUS
  • Supports a wide range of input sources
    • 3.9-V to 18-V wide input operating voltage range with 26-V absolute maximum input voltage
    • Maximizes source power with input voltage regulation (VINDPM) and input current regulation (IINDPM)
    • VINDPM threshold automatically tracks battery voltage
  • Efficient battery operation with 15-mΩ BATFET
  • Narrow VDC (NVDC) power path management
    • System instant-on with depleted or no battery
    • Battery supplement when adapter is fully loaded
  • Flexible autonomous or I2C-controlled modes
  • Integrated 12-bit ADC for voltage, current, temperature monitoring
  • High accuracy
    • ±0. 5% charge voltage regulation
    • ±5% charge current regulation
    • ±5% input current regulation
  • Safety
    • Thermal regulation and thermal shutdown
    • Input, system, battery overvoltage protection
    • Battery, converter overcurrent protection
    • Charging safety timer

The BQ25620 and BQ25622 are highly-integrated 3.5-A switch-mode battery charge management and system power path management devices for single cell Li-Ion and Li-polymer batteries. The solution is highly integrated with built-in current sensing, loop compensation, input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. The devices use narrow VDC power path management, regulating the system slightly above the battery voltage without dropping below a configurable minimum system voltage. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time, extends battery life during discharging phase, and the ultra-low 0.15-µA ship mode current extends battery shelf life. The I2C serial interface with charging and system settings makes the BQ25620 and BQ25622 truly flexible solutions.

The BQ25620 and BQ25622 are highly-integrated 3.5-A switch-mode battery charge management and system power path management devices for single cell Li-Ion and Li-polymer batteries. The solution is highly integrated with built-in current sensing, loop compensation, input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. The devices use narrow VDC power path management, regulating the system slightly above the battery voltage without dropping below a configurable minimum system voltage. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time, extends battery life during discharging phase, and the ultra-low 0.15-µA ship mode current extends battery shelf life. The I2C serial interface with charging and system settings makes the BQ25620 and BQ25622 truly flexible solutions.
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Type Title Date
* Data sheet BQ25620/BQ25622 I2C Controlled, 3.5-A, Maximum 18-V Input, Charger with NVDC Power Path Management and OTG Output datasheet (Rev. A) PDF | HTML 28 Oct 2022
Application note LiFePO4 Design Considerations PDF | HTML 26 Jul 2023
Analog Design Journal Optimize your application with a power path battery charger PDF | HTML 19 Jun 2023
Analog Design Journal 以電源路徑電池充電器將應用最佳化 PDF | HTML 19 Jun 2023
Application note Selection of Single-Cell Buck Narrow VDC Switching Battery Chargers PDF | HTML 10 Nov 2022
EVM User's guide BQ25620EVM User's Guide (Rev. A) PDF | HTML 02 Nov 2022
Certificate BQ25620EVM EU RoHS Declaration of Conformity (DoC) 25 Oct 2022
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Technical article Should I use a linear charger or a switching charger? 31 Oct 2015
Technical article Summertime and the livin' is easy 20 Jun 2014

Design & development

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Evaluation board

BQ25620EVM — BQ25620 evaluation module for I²C-controlled, 18-V input, single-cell 3.5-A buck battery charger

The BMS050 evaluation module (EVM) is a charger module for evaluating the BQ25620 3.5-A, up to 18-V input, I²C-controlled single-cell (1S) NVDC charger.

User guide: PDF | HTML
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WQFN-HR (RYK) 18 View options
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