XYT4257B summarize:
XYT4257B is a two-section lithium battery boost charge management IC with high integration and reliability. The XYT4257B charging current can be configured with external resistances, and the charging system integrates three loops: input adaptive loop, constant voltage output loop, and constant current output loop, providing excellent performance for the charging system. The XYT4257B‘s boost switch charge converter operates at 650KHz with a maximum 2.0A input charge and a conversion efficiency of 89%. The XYT4257B has an input voltage of 5V and a built-in adaptive loop to intelligently adjust the charging current and match all adapters.
XYT4257B integrates power MOS and adopts asynchronous switching architecture, so that it requires few peripheral devices in application, which can effectively reduce the overall solution size and reduce BOM cost. The XYT4257B integrates complete protection functions: input overvoltage, input undervoltage, output short circuit, output overvoltage and chip overtemperature protection.
The XYT4257B is available in a small ESOP8 package with a rated operating temperature range of -40 ° C to 85 ° C.
XYT4257Bpeculiarity：
The input voltage ranges from 3.6V to 5.5V
5V, 2.0A input asynchronous switch boost charging
Trickle/constant current/constant voltage charging
Built-in power MOS
The boost charging efficiency can reach 89%
The charging current is externally adjustable
Input adaptive charging, matching all adapters
650KHz switching frequency, can support 2.2uH inductance
Support LED charging status indication
Output overvoltage, short circuit protection
Input undervoltage, overvoltage protection
OTP overtemperature protection
MPL maximum power limit
XYT4257BApply：
Two-section series lithium battery charging
walkie-talkie
Bluetooth speaker
Electronic cigarette
Power tool
XYT4257B封裝形式：
ESOP-8
XYT4257B典型應(yīng)用電路圖：
XYT4257B典型應(yīng)用電路圖：
XYT4257B PCB Layout設(shè)計注意事項：
（1）電源端走線設(shè)計需盡可能的寬，且要單獨從電源端走線給XYT4257B供電。
（2）電源端電容需盡量貼近芯片放置。
（3）SW腳的走線設(shè)計需盡可能的短，有利于降低EMI。
（4）肖特基二極管與電感的連線需盡可能短且粗，防止過孔跳線。
（5）BOOST模塊中主要電流回路走線設(shè)計需盡量的短且粗。
（6）因芯片底部散熱片為功率地，需將其與大面積的地相連接，且焊接時需將底部散熱片和地可靠連接。
XYT4257B PCB Layout布線參考圖：
XYT4257B引腳定義及說明：
XYT4257B功能框圖：
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