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The RT9468 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 and regulation, high-accuracy voltage regulation, and charge termination. The charge current is regulated through integrated sensing resistors. The RT9468 also features USB On-The-Go (OTG) support. The RT9468 integrates an easy-to-use direct charge function, simply driving an external MOSFET to enable a direct charge path, as well as over-voltage protection, over-current protection, and watchdog functions.<br /><br />The RT9468 optimizes for charging task by using a control algorithm to vary the charge rate for different modes, including pre-charge mode, fast charge mode (constant voltage and constant current). The key charge parameters are programmable through an I<sup>2</sup>C interface. The RT9468 will resume the charge cycle whenever the battery voltage falls below an internal recharge threshold, and can automatically enter sleep mode if 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 RT9468 is available in a WQFN-32L 4x4 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.
RT9468 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Direct Charge with Over-Voltage Protection, Over- Current Protection and Watchdog </li><li>High Efficiency 5A, 1.5MHz Switching Charger with Output Inductor DFE252012F, TOKO <ul class="lv2"> <li></li><li>Charging Efficiency 90.25% at ICHG = 2A </li><li>Charging Efficiency 88.86% at ICHG = 3A </li><li>Charging Efficiency 84.2% at ICHG = 5A </li></ul> </li><li>Synchronous 1.5MHz/0.75MHz Fixed-Frequency PWM Controller with Up to 95% Duty Cycle </li><li>Power Path Management by BATFET Control </li><li>Support High Voltage Input (9V/12V) </li><li>Support High Voltage Input Adapter (Pump Express 1.0/2.0/3.0) </li><li>Support IR Compensation Function from Charger Output to Cell Terminal </li><li>Optimize Input Sourcing Capability to Prevent Overload <ul class="lv2"> <li></li><li>AICR Current Limit Setting via I<sup>2</sup>C </li><li>ILIM Pin for Current Limit Setting </li><li>Average Input Current Limit Measurement </li></ul> </li><li>Shipping Mode for Battery Leakage Reduction <ul class="lv2"> <li></li><li>Wake Up System, Exit Shipping Mode, and Reset System by <span class="overline">QON</span> Pin </li></ul> </li><li>Automatic Charging </li><li>Average Input Current Regulation (AICR) : 0.1A to 3.25A in 50mA Steps </li><li>Charge Current Regulation Accuracy : ±7% </li><li>Charge Voltage Regulation Accuracy : ±1% </li><li>Protection for Overall System Considerations <ul class="lv2"> <li></li><li>Thermal Regulation for Current Reduction and Over-Temperature Protection </li><li>Input Over-Voltage Protection </li><li>Input Bad Adapter Protection </li><li>Battery Over-Voltage Protection </li></ul> </li><li>Support ADC Conversion for <ul class="lv2"> <li></li><li>VBUS, VBAT, VSYS, REGN, TS_BAT, IBUS, IBAT, TEMP_JC, TS_BUS,VBATS, IBATS </li></ul> </li><li>INT Output for Communication with Host Through I<sup>2</sup>C (Watch Dog / Polling Function) </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Cellular Telephones </li><li>Personal Information Appliances </li><li>Tablet PC, Power Bank </li><li>Portable Instruments </li></ul></div>
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