BQ25122
300-mA linear battery charger with Power Path, integrated LDO and buck converter 1.2V default output
BQ25122
- 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.
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | 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 May 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 Dec 2017 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
BQ25122EVM — 700nA Low Iq Highly Integrated Battery Charge Management Evaluation Module for Wearables & Hearables
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YFP) | 25 | Ultra Librarian |
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