ZHCS229C September 2011 – January 2020 BQ24725A
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Parameter Measurement Information
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4
Device Functional Modes
- 8.4.1 Adapter Detect and ACOK Output
- 8.4.2 Adapter Over Voltage (ACOVP)
- 8.4.3 System Power Selection
- 8.4.4 Battery LEARN Cycle
- 8.4.5 Enable and Disable Charging
- 8.4.6 Automatic Internal Soft-Start Charger Current
- 8.4.7 High Accuracy Current Sense Amplifier
- 8.4.8 Charge Timeout
- 8.4.9 Converter Operation
- 8.4.10 Continuous Conduction Mode (CCM)
- 8.4.11 Discontinuous Conduction Mode (DCM)
- 8.4.12 Input Over Current Protection (ACOC)
- 8.4.13 Charge Over Current Protection (CHGOCP)
- 8.4.14 Battery Over Voltage Protection (BATOVP)
- 8.4.15 Battery Shorted to Ground (BATLOWV)
- 8.4.16 Thermal Shutdown Protection (TSHUT)
- 8.4.17 EMI Switching Frequency Adjust
- 8.4.18 Inductor Short, MOSFET Short Protection
- 8.5 Register Maps
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Applications
- 9.2.1
Typical System with Two NMOS Selector
- 9.2.1.1 Design Requirements
- 9.2.1.2
Detailed Design Procedure
- 9.2.1.2.1 Negative Output Voltage Protection
- 9.2.1.2.2 Reverse Input Voltage Protection
- 9.2.1.2.3 Reduce Battery Quiescent Current
- 9.2.1.2.4 Inductor Selection
- 9.2.1.2.5 Input Capacitor
- 9.2.1.2.6 Output Capacitor
- 9.2.1.2.7 Power MOSFETs Selection
- 9.2.1.2.8 Input Filter Design
- 9.2.1.2.9 BQ24725A Design Guideline
- 9.2.1.3 Application Curves
- 9.2.2 Simplified System without Power Path
- 9.2.1
Typical System with Two NMOS Selector
- 9.3 System Examples
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機(jī)械、封裝和可訂購信息
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RGR|20
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RGR|20
訂購信息
3 說明
BQ24725A 是一款高效同步的電池充電器，所含組件數(shù)較少，適用于空間受限的多化合物電池充電 應(yīng)用。
BQ24725A 利用兩個電荷泵分別驅(qū)動 N 溝道 MOSFET（ACFET、RBFET 和 BATFET），從而自動選擇系統(tǒng)電源。
SMBus 控制的輸入電流、充電電流和充電電壓 DAC 具有很高的調(diào)節(jié)精度，該精度可通過系統(tǒng)電源管理微控制器輕松編程。
BQ24725A 使用內(nèi)部輸入電流寄存器或外部 ILIM 引腳來調(diào)節(jié) PWM 調(diào)制，以減小充電電流。
BQ24725A 可對 1 節(jié)、2 節(jié)、3 節(jié)或 4 節(jié)串聯(lián)鋰電子電池充電。
- 如需了解所有可用封裝，請參閱產(chǎn)品說明書末尾的可訂購產(chǎn)品附錄。
