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The RT5024 is a complete power supply solution for digital still cameras and other hand held devices. The RT5024 is composed of multi-channel DC-DC power converter unit, a single-cell linear Li+ ion battery charger, a charger type detector, and an I<sup>2</sup>C control interface. The power converter unit includes one synchronous step-up converter (CH1), one synchronous step-up/down converter (CH2), three synchronous step-down converters (CH3/4/5), two LDOs with input power as low as 1.5V (CH6/8), one WLED driver in synchronous high-voltage step-up mode or low-voltage current regulator mode (CH7), and a keep-alive LDO (CH9) for RTC application. All converters are internally frequency compensated and integrate power MOSFETs. The power converter unit provides complete protection functions : over current, thermal shutdown, over voltage and under voltage protection. The RT5024 has a WAKEUP impulse generation circuitry to monitor VIN or BAT installation event. To fulfill most of applications, the RT5024 has six preset power on/off sequences. The battery charger includes Auto Power Path Management (APPM). No external MOSFETs are required. The charger can enter sleep mode when power is removed.
RT5024 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Power Converter Unit </li><li>CH1 LV Sync Step-Up <ul class="lv2"> <li></li><li>Support Up to 1A Loading, DVS (Dynamic Voltage Scaling), Load-Disconnect, Up to 95% Efficiency, PSM/PWM Selectable </li></ul> </li><li>CH2 LV Sync Step-Up/Down <ul class="lv2"> <li></li><li>Support Up to 1A Loading, DVS, Up to 95% Efficiency, PSM/PWM Selectable </li></ul> </li><li>CH3/4 LV Sync Step-Down <ul class="lv2"> <li></li><li>Support Up to 1.3A Loading, DVS, Up to 95% Efficiency, 100% (max) Duty Cycle, PSM/PWM Selectable </li></ul> </li><li>CH5 LV Sync Step-Down <ul class="lv2"> <li></li><li>Support Up to 0.6A Loading, Up to 95% Efficiency, 100% (max) Duty Cycle </li><li>Output Voltage can be Selected from Preset List or Set by External Feedback Network. </li></ul> </li><li>CH6 Low Input Power LDO <ul class="lv2"> <li></li><li>VIN Range 1.5V to 5.5V </li><li>Output Voltage Level Selectable in I<sup>2</sup>C Register </li></ul> </li><li>CH7 WLED Driver in Either Sync Step-Up Operation or Current Regulator Operation <ul class="lv2"> <li></li><li>Step-Up Mode with LED Open Protection (OVP7 16V or 25V, Selectable in I<sup>2</sup>C Register) </li><li>Step-Up Mode Support Series 2 to 6 WLED and Load Disconnect Function </li><li>Current Regulator Mode for 1 WLED </li><li>31 WLED Dimming Levels </li><li>Automatic Mode Selection by External Circuit Topology </li></ul> </li><li>CH8 Generic LDO <ul class="lv2"> <li></li><li>VIN Range 1.5V to 5.5V </li><li>Output Voltage Level Selectable in I<sup>2</sup>C Register </li></ul> </li><li>CH9 Low Quiescent LDO with Reverse Leakage Prevention for RTC Power Supply <ul class="lv2"> <li></li><li>Fixed 3.25V Output </li></ul> </li><li>Six Preset Power On/Off Sequences by One Pin SEQ <ul class="lv2"> <li></li><li>SEQ # 0 : CH2→ CH3 → CH4 </li><li>SEQ # 1 : CH1→ CH3 → CH2→ CH4 </li><li>SEQ # 2 : CH1→ CH3 → CH4 → CH2 </li><li>SEQ # 3 : CH1→ CH2 → CH4 → CH3 </li><li>SEQ # 4 : CH1→ CH4→ CH3→ CH2→ CH5 </li><li>SEQ # 5 : CH1→ CH4→ CH2→ CH3 </li></ul> </li><li>All Power Switches Integrated with Internal Compensation </li><li>Discharge Output of Every Channels when Turning Off </li><li>Wake Up Impulse to Monitor BAT and VIN Plug-In </li><li>Fixed 2MHz Switching Frequency for CH1/3/4/5, Fixed 1MHz Switching Frequency for CH2/7 </li><li>Charger Unit </li><li>28V Maximum Rating for VIN Power </li><li>Selectable Power Input Current Limit (0.1A / 0.5A / 1A / 1.5A) </li><li>Auto Power Path Management (APPM) with Integrated Power MOSFETs </li><li>Battery Charging Current Control and Regulation Voltage Control </li><li>Programmable Charging Current and Safe Charge Timer </li><li>Optimized Charge Rate via Thermal Feedback </li><li>Under Voltage Protection, Over Voltage Protection </li><li>Charger Status Indicator </li><li>Interrupt Indicator to JEITA Temperature/Fault/Status Events when PMU is Enabled <ul class="lv2"> <li></li><li>Battery Temperature Events </li><li>Battery Removing Event </li><li>Charger in Thermal Regulation Control </li><li>Safety Timer Timeout </li><li>End of Charging </li><li>VIN Power Good </li><li>VIN < DPM Threshold 4.35V </li><li>Charger Type Detection Finishing </li></ul> </li><li>Charger Type Detection <ul class="lv2"> <li></li><li>Dedicated Charger : Support Apple and Sony Charger </li><li>Secondary Charger Detection to Distinguish CDP and DCP </li></ul> </li><li>I<sup>2</sup>C Control Interface : Support Fast Mode up to 400kb/s </li><li>Small 40-Lead WQFN 5x5 Package </li><li>RoHS Compliant and Halogen Free <p></p> </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>DSC Power Supply System </li><li>CMOS-Sensor DV </li><li>Portable Instruments </li></ul></div>
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