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RT9458WSC Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9458WSC Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 27 page  RT9458 ® DS9458-02 February 2017 www.richtek.com 1 © Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Switch-Mode Single Cell Li-Ion Battery Charger with USB-OTG General Description The RT9458 is a switch-mode single cell Li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller, power MOSFETs, input current sensing, high accuracy voltage regulation and charge termination circuits. The RT9458 also features USB On-The-Go (OTG). The RT9458 optimizes the charging task by using a control algorithm to vary the charge rate via different modes, including pre-charge mode, fast charge mode, and constant voltage mode. The key charge parameters can be programmed via the I 2C interface. The RT9458 resumes the charge cycle whenever the battery voltage falls below an internal threshold and automatically enters sleep mode when the input power supply is removed. Other features include under-voltage protection, over- voltage protection, thermal regulation and reverse leakage protection. The RT9458 is available in the small WL-CSP-20B 2.1x1.87 (BSC) package. Applications Cellular Telephones Personal Information Appliances MP3 Players Portable Instruments Simplified Application Circuit Features Support Quick Start for Charger High Accuracy Voltage/Current Regulation Input Current Regulation : 100mA/500mA/700mA/ 1A Minimum Input Voltage Regulation : 4.1V to 4.7V Per 0.1V Step Charge Voltage Regulation Accuracy : ±±±±±1% (0 to 85 °°°°°C) Charge Current Regulation Accuracy : ±±±±±5% Built-In Input Current Sensing and Limiting Integrated Power MOSFETS for up to 1.55A Charge Rate Integrated Sensing Resistors for Charging Current Sensing Synchronous 1.5MHz Fixed Frequency PWM Controller with up to 95% Duty Cycle Reverse Leakage Protection to Prevent Battery Drainage Thermal Regulation and Protection Over-Temperature Protection Input Over-Voltage Protection IRQ Output for Communication with I2C Automatic Charging RoHS Compliant and Halogen Free Marking Information BATS LX GND OTG RT9458 VIN To Adaptor/USB + ISNSIN VMID SCL SDA IRQ Battery 4EW 4E : Product Code W : Date Code |
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