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The RT5072 is a complete power supply solution for digital still cameras and other hand held devices. The RT5072 is composed of a 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 RT5072 has a WAKEUP impulse generation circuitry to monitor VIN or BAT installation event. To fulfill most of applications, the RT5072 has six preset power-on/off sequences. </p>The battery charger includes Auto Power Path Management (APPM). No external MOSFETs are required. The charger can enter sleep mode when power is removed. Charging tasks are optimized by using a control algorithm to vary the charge rate, including pre-charge mode, fast charge mode and constant voltage mode. The charge current can also be programmed via the I<sup>2</sup>C control interface. The battery regulation voltage and current can be adjusted by JEITA standard temperature control or other schemes set via the I<sup>2</sup>C interface. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The charging task will always be terminated in constant-voltage mode when the charging current reduces to the termination current of 10% x I<sub>CHG_FAST</sub>. The charger includes under-voltage and over-voltage protection for the supply input voltage, VIN. The charger includes USB charger detection circuitry via D+ and D- pins of USB interface to detect USB standard downstream ports (SDP), USB charging downstream port (CDP), dedicated charger port (DCP), or Apple/Sony charger ports. RT5072 uses some indicators to show charger states : two open drain ports <span class="overline">CHG</span> and <span class="overline">CHG2</span>, and an interrupt (<span class="overline">INT</span>) to immediately notify the state change.The RT5072 has I2C interface to control rich functions of Power Converter Unit and Charger Unit, and is available in the WQFN-40L 5x5 package.</p>
RT5072 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 3A (CH3) / 2A (CH4) 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>V<sub>IN</sub> 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>V<sub>IN</sub> 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 3.05V Output </li></ul> </li><li>Six Preset Power On/Off Sequences by One Pin SEQ <ul class="lv2"> <li></li><li>SEQ

0 : CH2<span style="font-family: Symbol; font-size: 12pt"><span>®</span></span> CH3<span style="font-family:

Symbol; font-size: 12pt"><span>®</span></span> CH4 </li><li>SEQ # 1 : CH1<span style="font-family: Symbol; font-size: 12pt"><span>®</span></span> CH3<span style="font-family: Symbol; font-size: 12pt"><span>®</span></span> CH2 <span style="font-family: Symbol; font-size: 12pt"><span>®</span></span>CH4 </li><li>SEQ # 2 : CH1<span style="font-family: Symbol; font-size: 12pt"><span>®</span></span> CH3 <span style="font-family: Symbol; font-size: 12pt"><span>®</span></span>CH4<span style="font-family: Symbol; font-size: 12pt"><span>®</span></span> CH2 </li><li>SEQ # 3 : CH1<span style="font-family: Symbol; font-size: 12pt"><span>®</span></span> CH2<span style="font-family: Symbol; font-size: 12pt"><span>®</span></span> CH4<span style="font-family: Symbol; font-size: 12pt"><span>®</span></span> CH3 </li></ul> </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 Devices </li></ul></div>
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