1 特性

• 具有独立电源路径的高效开关模式充电器
• 从深度放电电池或者在缺少电池的情况下启动系统
• USB 充电兼容
  • 100mA、500mA、900mA、1.5A 和 2A
    可选输入电流限制
• BC1.2 兼容 D+、D– 检测
• 在主机模式下（在 I²C 通信开始之后、看门狗计时器超时之前）
  • 可编程电池充电电压 (V_BATREG)
  • 可编程充电电流 (I_CHG)
  • 可编程输入电流限值 (I_LIM)
  • 基于输入电压的可编程动态电源管理阈值 (V_{IN_DPM})
  • 可编程输入过压保护阈值 (V_OVP)
  • 可编程安全计时器
• 针对以下各项的电阻器可编程默认值：
  • 具有电流监控输出的高达 2A 的 I_CHG (ISET)
  • 具有电流监控输出的高达 2A 的 I_LIM (ILIM)
  • V_{IN_DPM} (VDPM)
• 看门狗计时器禁用位
• 集成 4.9V、50mA LDO
• 完整的系统级保护
  • 输入 UVLO、输入过压保护 (OVP)、电池 OVP、睡眠模式、VIN_DPM
  • 输入电流限制
  • 充电电流限制
  • 热调节
  • 热关断
  • 符合 JEITA 标准的基于电压的 NTC 监控输入
  • 安全计时器
• 22V 绝对最大输入电压额定值
• 10.5V 最大运行输入电压
• 用于实现高达 2A 的充电速度的低 R_DS(on) 集成功率 FET
• 开漏状态输出
• 可支持小型电感器的运行频率为 3MHz 的同步固定频率 PWM 控制器
• AnyBoot 可靠电池检测算法
• 用于在任一给定充电电流上缩短充电时间的充电时间优化器
• 2.40mm x 2.00mm 30 焊球 DSBGA 和 4mm x 4mm 24 引脚 QFN 封装

2 应用

• 手机和智能手机
• MP3 播放器
• 便携式媒体播放器
• 手持设备

3 说明

bq24251 和 bq24253 是高度集成的单节锂离子电池充电器和系统电源路径管理器件，适用于采用高容量电池的空间受限型便携式 应用 。单节电池充电器具有一个由 USB 端口或交流壁式适配器供电的单一输入，用于提供多用途解决方案。

1. 如需了解所有可用封装，请参阅数据表末尾的可订购产品附录。

4 修订历史记录

Changes from G Revision (January 2015) to H Revision

• Changed 将 20V 最大输入电压额定值特性项目更改成了 22V，以匹配“绝对最大额定值”表Go
• Deleted 在整个产品说明书中删除了 bq24250 器件Go
• Changed Figure 11 and Figure 12 image X-axis labels from "Temperature (fC)" to "Temperature (°C)" Go

Changes from F Revision (December 2014) to G Revision

• Deleted Lead temperature (soldering) spec from Absolute Maximum Ratings table. See Package Option Addendum. Go
• Changed table heading from Handling Ratings to ESD Ratings. Moved T_stg spec to the Absolute Maximum Ratings tableGo
• Changed the test condition of IBAT- Battery discharge current in SYSOFF mode: Removed “(BAT, SW, SYS)”Go
• Added spec for I_IN/I_ILIM ratio Go

Changes from E Revision (December 2013) to F Revision

• Added 处理额定值表，特性 说明 部分、器件功能模式、应用和实施 部分、电源相关建议 部分、布局 部分、器件和文档支持 部分以及机械、封装和可订购信息 部分Go
• Deleted the minimum spec for RILIM-SHORT and changed the typical value to 55 ohm and maximum spec to 75 ohm.Go
• Changed V_LDO values to (4.65, 4.85, 5.04) and added description in the second column.Go

Changes from D Revision (July 2013) to E Revision

• Changed VDPM pin desctiption from "......sets a default of 4.36V" to ".......sets a default of 4.68V" Go
• Changed text string in the V_{IN_DLM} settings description from: "The ISET resistor must be floated in order to avoid an internal fault." to: "The ISET resistor must be connected in order to avoid an unstable charging state."Go
• Changed text string in the Sleep Mode description from: "...sends a single 256μs pulse is sent on the STAT and INT outputs..." to: "...sends a single 256µs pulse on the STAT and INT outputs..."Go
• Changed text string in the Input Over-Voltage Protection description from: "...turns the battery FET, sends a single 256-μs pulse is sent on the STAT and INT outputs..." to "...turns on the battery FET, sends a single 256-μs pulse on the STAT and INT outputs....."Go
• Added Serial Interface DescriptionGo
• Changed Register #3 description, B1(4)(5) Name from: "USB_DET_1/EN1" to: "USB_DET_1/EN2"Go
• Changed Register #3 description, B0(LSB) Name from: "USB_DET_0/EN0" to: "USB_DET_0/EN1"Go
• Changed Register #3 description, B1(4)(5) and B0(LSB) FUNCTION entries from: "Return USB detection result or pin EN1/EN0 status –" to "Return USB detection result or pin EN2/EN1 status –" ; changed 00 - DCP detected / from: "EN1=0, EN0=0" to: "EN2=0, EN1=0"; changed 01 - CDP detected / from: "EN1=0, EN0=1" to: "EN2=0, EN1=1"; changed 10 - SDP detected / from: "EN1=1, EN0=0" to: "EN2=1, EN1=0"; and changed 11 - Apple/TT or non-standard adaptor detected / from: "EN1=1, EN0=1" to: "EN2=1, EN1=1", respectively.Go

Changes from C Revision (June 2013) to D Revision

• Changed VDPM Pin Description regulator reference from "1.23V" to "1.2" Go
• Changed text string in D+/D- pin description from "....will remain low..." to "...will remain high impedance..."Go
• Added SCL and SDA to Pin Voltage Range spec in the Absolute Maximum Ratings tableGo
• Changed spec conditions for Output Current (Continuous), from "IN, SW, SYS, BAT" to "IN, SYS, BAT " in ABS Max Ratings table Go
• Changed Figure 20 Go
• Added text to NTC Monitor description for clarification.Go
• Added text to Safety Timer description for clarification.Go
• Changed Fault Condition from "Input Good" to "Input Fault & LDO Low" in Fault Conditions table.Go
• Changed Register #2 Reset state from "1010 1100" to "xxxx 1100"Go
• Changed Register #4 Reset state from "0000 0000" to "1111 1000"Go
• Changed Bit B7, B6, B5, B4, B3 FUNCTION description from "(default 0)" to "(default 1)"Go
• Changed Register #4 Footnote (1) text from "...current is 500ma...." to " .....current is external.."Go
• Changed TS_EN description from "When set to a ‘1' the TS function is disabled ....." to "When set to a ‘0’, the TS function is disabled..."Go
• Added text to TS_STAT description for clarification.Go
• Changed Register #7, Bit B3 FUNCTION description from "...if TERM is true or EN_PTM is true..." to "if TERM is true or Force PTM s true..."Go

Changes from B Revision (May 2013) to C Revision

• Deleted 从器件 bq24250YFF、bq24251YFF、bq24251RGE 和 bq24253RGE 中删除了“预览”状态注释Go

Changes from A Revision (March 2013) to B Revision

• Added 在“订购信息”表中向器件添加了“预览”状态（bq24250RGER 和 bq24250RGET 除外）Go

Changes from * Revision (October 2012) to A Revision

• 从“产品简介”更改成了“完整的产品说明书”Go
• Added Typical Characteristics graphsGo
• Changed Equation (3)Go
• Changed text in the F/S Mode Protocol section from "...to either transmit data to the slave (R/W bit 1) or receive data from the slave (R/W bit 0" to "...to either transmit data to the slave (R/W bit 0) or receive data from the slave (R/W bit 1)" for clarification.Go