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.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | BQ25122 Low IQ Highly Integrated Battery Charge Management Solution for Hearables, Wearables, and IoT datasheet (Rev. A) | PDF | HTML | 2021年 1月 19日 |
| Application note | Implementing 2-V Charge Inhibition | PDF | HTML | 2023年 5月 31日 | |
| Application note | BQ2512x Frequently Asked Questions | 2021年 11月 22日 | ||
| Technical article | Pull the tab: How to implement ship mode in your lithium-ion battery design | PDF | HTML | 2019年 2月 20日 |
設計與開發
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BQ25122EVM — 適用於穿戴式裝置和耳戴式裝置的 700nA 低 IQ 高度整合式電池充電管理評估模組
bq25122EVM 評估模組是高度整合的電池充電管理 IC，整合穿戴式裝置最常見的功能：線性充電器、穩壓輸出、負載開關、具定時器的手動重設及電池電壓監控運作和關機期間的低靜態電流可最大限度延長電池使用壽命。本裝置支援從 5mA 至 300mA 的充電電流。輸入電流限制、充電電流、PWM 輸出電壓、LDO 輸出電壓和其它參數可透過 I2C 介面進行程式化。電池採用標準鋰離子三階段充電曲線進行充電：預充電、恆流和恆壓
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| DSBGA (YFP) | 25 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。