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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). <br /><br />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<sup>2</sup>C 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.<br /><br />Other features include under-voltage protection, over-voltage protection, thermal regulation and reverse leakage protection.<br /><br />The RT9458 is available in the small WL-CSP-20B 2.1x1.87 (BSC) package.<br /><br />The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.
RT9458 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Support Quick Start for Charger </li><li>High Accuracy Voltage/Current Regulation </li><li>Input Current Regulation : 100mA/500mA/700mA/1A </li><li>Minimum Input Voltage Regulation : 4.1V to 4.7V Per 0.1V Step </li><li>Charge Voltage Regulation Accuracy : ±1% </li><li>Charge Current Regulation Accuracy : ±5% </li><li>Built-In Input Current Sensing and Limiting </li><li>Integrated Power MOSFETS for up to 1.55A Charge Rate </li><li>Integrated Sensing Resistors for Charging Current Sensing </li><li>Synchronous 1.5MHz Fixed Frequency PWM Controller with up to 95% Duty Cycle </li><li>Reverse Leakage Protection to Prevent Battery Drainage </li><li>Thermal Regulation and Protection </li><li>Over-Temperature Protection </li><li>Input Over-Voltage Protection </li><li>IRQ Output for Communication with I<sup>2</sup>C </li><li>Automatic Charging </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT9458 Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Cellular Telephones </li><li>Personal Information Appliances </li><li>MP3 Players </li><li>Portable Instruments </li></ul></div>
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