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参数

Number of series cells 2 Charge current (Max) (A) 3 Operating Vin (Max) (V) 17 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.4 Battery charge voltage (Max) (V) 9 Absolute Vin (safety rating) (Max) ((V)) 28 Control interface Standalone, Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IINDPM (Input current limit), Input OVP Operating Vin (Min) (V) 4 Rating Catalog open-in-new 查找其它 电池充电器 IC

封装|引脚|尺寸

WQFN (RTE) 16 9 mm² 3 x 3 open-in-new 查找其它 电池充电器 IC

特性

  • Standalone charger and easy to configure
  • High-efficiency, 1.2-MHz, synchronous switch-mode buck charger
    • 92.5% charge efficiency at 2A from 5-V input for 1-cell battery
    • 91.8% charge efficiency at 2A from 9-V input for 1-cell battery
    • 95% charge efficiency at 2A from 12-V input for 2-cell battery
  • Single input to support USB input and high voltage adaptors
    • Support 4.1-V - 17-V input voltage range with 28-V absolute maximum input voltage rating
    • Input Voltage Dynamic Power Management (VINDPM) tracking battery voltage
  • High integration
    • Integrated reverse blocking and synchronous switching MOSFET
    • Internal input and charge current sense
    • Internal loop compensation
    • Integrated bootstrap diode
  • 3.4-V to 9.0-V programmable charge voltage
  • 3.0-A maximum fast charge current
  • 200-nA low battery leakage current at 4.5-V VBAT
  • 4.25-µA VBUS supply current in IC disable mode
  • Charge current thermal regulation at 120°C
  • Precharge current: 10% of fast charge current
  • Termination current: 10% of fast charge current
  • Charge accuracy
    • ±0.5% charge voltage regulation
    • ±10% charge current regulation
  • Safety
    • Thermal regulation and thermal shutdown
    • Input Under-Voltage Lockout (UVLO) and Over-Voltage Protection (OVP)
    • Battery overcharge protection
    • Safety timer for precharge and fast charge
    • Charge disabled if battery feedback pin FB is open or short
    • Cold/hot battery temperature protection
    • Fault report on STAT pin
  • Available in WQFN 3x3-16 package
open-in-new 查找其它 电池充电器 IC

描述

The BQ25306 is a highly-integrated standalone switch-mode battery charger for 1-cell and 2-cell Li-ion, Li-polymer, and LiFePO4 batteries. The BQ25306 supports 4.1-V to 17-V input voltage and 3-A fast charge current.The integrated current sensing topology of the device enables high charge efficiency and low BOM cost. The best-in-class 200-nA low quiescent current of the device conserves battery energy and maximizes the shelf time for portable devices. The BQ25306 is available in a 3x3 WQFN package for easy 2-layer layout and space limited applications.

The BQ25306supports a 4.1-V to 17-V input to charge either single cell batteries or dual batteries in series with charge voltage from 3.4 V to 9.0 V programmable by resistor divider. The BQ25306provides up to 3-A continuous charge current to a single cell (1S) battery or dual cell batteries in series (2S). The device features fast charging for portable devices. Its input voltage regulation delivers maximum charging power to the battery from input source. The solution is highly integrated with an input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), and low-side switching FET (LSFET, Q3).

The BQ25306 features lossless integrated current sensing to reduce power loss and BOM cost with minimized component count. It also integrates a bootstrap diode for the high-side gate drive and battery temperature monitor to simplify system design. The device initiates and completes a charging cycle without host control. The BQ25306 charge voltage and charge current are set by external resistors. The BQ25306charge voltage is programmed by an external resister divider and it charges the battery in three phases: pre-conditioning, constant current, and constant voltage. At the end of the charging cycle, the charger automatically terminates if the charge current is below the termination current threshold and the battery voltage is above the recharge threshold. When the battery voltage falls below the recharge threshold, the charger will automatically start another charging cycle. The charger provides various safety features for battery charging and system operations, including battery temperature monitoring based on negative temperature coefficient (NTC) thermistor, charge safety timer, input over-voltage and over-current protections, as well as battery over-voltage protection. Pin open and short protection is also built in to protect against the battery voltage feedback pin FB or feedback resistors accidently open or short. The thermal regulation regulates charge current to limit die temperature during high power operation or high ambient temperature conditions.

The STAT pin output reports charging status and fault conditions. When the input voltage is removed, the device automatically enters HiZ mode with very low leakage current from battery to the charger device. The BQ25306 is available in a 3 mm x 3 mm thin WQFN package.

open-in-new 查找其它 电池充电器 IC
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BQ25302 正在供货 独立单节 2.0A 降压电池充电器 Optimized for 5-V input and 1 S battery

技术文档

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类型 标题 下载最新的英文版本 日期
* 数据表 BQ25306 Standalone 17-V, 3.0-A 1-2 Cell Buck Battery Charger 数据表 (Rev. A) 2020年 11月 17日
证书 BQ25306EVM EU RoHS Declaration of Conformity (DoC) 2020年 12月 11日
用户指南 BQ25306 Evaluation Module User's Guide (Rev. A) 2020年 12月 9日
技术文章 5 questions to ask when designing with rechargeable batteries for personal care products 2020年 6月 23日
技术文章 When to use rechargeable batteries in small battery applications 2019年 10月 1日
技术文章 Should I use a linear charger or a switching charger? 2015年 10月 31日
技术文章 Summertime and the livin' is easy 2014年 6月 20日

设计与开发

有关其他条款或所需资源,请点击下面的任何链接来查看详情页面。

硬件开发

评估板 下载
document-generic 用户指南
49
说明
BQ25306EVM 评估模块 (EVM) 用于评估 BQ25306 器件。这是一款高度集成的 3A 独立式 1-2 节电池、17V、1.2MHz 同步开关模式降压电池充电器,具有可编程的充电电压。
特性
  • 高效 1.2MHz 同步开关模式降压充电器
  • 单个输入,支持 USB 输入适配器
  • 输入电压动态电源管理 (VINDPM)
  • 拔掉适配器后具有 1µA 的低电池泄漏电流
  • 支持 300mA 至 3A 的充电电流

CAD/CAE 符号

封装 引脚 下载
WQFN (RTE) 16 了解详情

订购与质量

包含信息:
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/FIT 估算
  • 材料成分
  • 认证摘要
  • 持续可靠性监测

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