Produktdetails

Number of series cells 1 Charge current (max) (A) 0.3 Vin (max) (V) 5.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 3.6 Battery charge voltage (max) (V) 4.65 Absolute max Vin (max) (V) 20 Control topology Linear Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, Input OVP, Integrated LDO, Integrated buck converter, Power Path Vin (min) (V) 3.4 Rating Catalog Operating temperature range (°C) -40 to 85
Number of series cells 1 Charge current (max) (A) 0.3 Vin (max) (V) 5.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 3.6 Battery charge voltage (max) (V) 4.65 Absolute max Vin (max) (V) 20 Control topology Linear Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, Input OVP, Integrated LDO, Integrated buck converter, Power Path Vin (min) (V) 3.4 Rating Catalog Operating temperature range (°C) -40 to 85
DSBGA (YFP) 25 6.75999999999999792000000000000016 mm² 2.5999999999999996 x 2.5999999999999996
  • Increases system operation time between charges
    • Configurable 300-mA buck regulator (1.2-V default)
    • 700-nA (typical) Iq with buck converter enabled (no load)
    • Configurable load switch or 100-mA LDO output (load switch enabled by default)
    • Up to 300-mA charge current for fast charging
    • 0.5% Accurate battery voltage regulation (configurable from 3.6 V to 4.65 V in 10-mV steps)
    • Configurable termination current down to 500 µA
    • Simple voltage based battery monitor
  • Highly integrated solution with small footprint
    • 2.5 mm x 2.5 mm WCSP package and 6 external components for minimal solution
    • Push-button wake-up and reset with adjustable timers
    • Power Path management for powering the system and charging the battery
    • Power Path management enables < 50 nA 150-nA Ship Mode battery quiescent current for longest shelf life
    • Battery charger operates from 3.4 V – 5.5 VIN (5.5-V OVP / 20-V tolerant)
    • Dedicated pins for input current limit, charge current, termination current, and status output
  • I2C Communication control
    • Charge voltage and current
    • Termination threshold
    • Input current limit
    • Load switch control
    • Controls for interrupts for faults and status
    • System output voltage adjustment
    • LDO Output voltage adjustment
  • Safety-Related Certification:
    • TUV IEC 62368-1 Certification
  • Increases system operation time between charges
    • Configurable 300-mA buck regulator (1.2-V default)
    • 700-nA (typical) Iq with buck converter enabled (no load)
    • Configurable load switch or 100-mA LDO output (load switch enabled by default)
    • Up to 300-mA charge current for fast charging
    • 0.5% Accurate battery voltage regulation (configurable from 3.6 V to 4.65 V in 10-mV steps)
    • Configurable termination current down to 500 µA
    • Simple voltage based battery monitor
  • Highly integrated solution with small footprint
    • 2.5 mm x 2.5 mm WCSP package and 6 external components for minimal solution
    • Push-button wake-up and reset with adjustable timers
    • Power Path management for powering the system and charging the battery
    • Power Path management enables < 50 nA 150-nA Ship Mode battery quiescent current for longest shelf life
    • Battery charger operates from 3.4 V – 5.5 VIN (5.5-V OVP / 20-V tolerant)
    • Dedicated pins for input current limit, charge current, termination current, and status output
  • I2C Communication control
    • Charge voltage and current
    • Termination threshold
    • Input current limit
    • Load switch control
    • Controls for interrupts for faults and status
    • System output voltage adjustment
    • LDO Output voltage adjustment
  • Safety-Related Certification:
    • TUV IEC 62368-1 Certification

The BQ25122 is a highly integrated battery charge management IC that integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The integrated buck converter is a high efficiency, low IQ switcher using DCS control that extends light load efficiency down to 10-µA load currents. The low quiescent current during operation and shutdown enables maximum battery life. The device supports charge currents from 5 mA to 300 mA.

The input current limit, charge current, buck converter output voltage, LDO output voltage, and other parameters are programmable through the I2C interface.

The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.

A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows multiple different configuration options for wake are reset optimization.

The BQ25122 is a highly integrated battery charge management IC that integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The integrated buck converter is a high efficiency, low IQ switcher using DCS control that extends light load efficiency down to 10-µA load currents. The low quiescent current during operation and shutdown enables maximum battery life. The device supports charge currents from 5 mA to 300 mA.

The input current limit, charge current, buck converter output voltage, LDO output voltage, and other parameters are programmable through the I2C interface.

The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.

A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows multiple different configuration options for wake are reset optimization.

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Technische Dokumentation

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Typ Titel Datum
* Data sheet BQ25122 Low IQ Highly Integrated Battery Charge Management Solution for Hearables, Wearables, and IoT datasheet (Rev. A) PDF | HTML 19 Jan 2021
Application note Implementing 2-V Charge Inhibition PDF | HTML 31 Mai 2023
Application note BQ2512x Frequently Asked Questions 22 Nov 2021
Technical article Pull the tab: How to implement ship mode in your lithium-ion battery design PDF | HTML 20 Feb 2019
EVM User's guide bq25120AEVM and bq25122EVM Evaluation Modules (Rev. A) 04 Dez 2017

Design und Entwicklung

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Evaluierungsplatine

BQ25122EVM — 700 nA, Niedriger Iq, Hochintegriertes Batterie-Lademanagement-Evaluierungsmodul für Wearables und H

The bq25122EVM evaluation module is a highly integrated battery charge management IC that integrates the most common functions for wearables devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The low quiescent current during operation and (...)

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