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The RT8092 is a Peak-Current Mode Pulse-Width-Modulated (PWM) step-down DC/DC converter with I<sup>2</sup>C control interface. Capable of delivering 4A continuing output current over a wide input voltage range from 2.5V to 5.5V, the RT8092 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources within the range such as cellular phones, PDAs and handy-terminals. <br /><br />Internal synchronous rectifier with low R<sub>DS(ON)</sub> dramatically reduces conduction loss at PWM mode. No external Schottky barrier diode is required in practical application. The RT8092 enters low-dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. The RT8092 enters shut-down mode and consumes less than 5μA when the EN pin is pulled low. The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operation frequency of 3MHz. The small WL-CSP-15B 1.2x2 (BSC) and WQFN-14L 3.5x3.5 packages are ideal for small PCB area applications. <br /><br />To increase battery life time, the RT8092 provides low power mode with I<sub>Q</sub> < 15μA in standby and light-load applications. The RT8092 also includes Dynamic Voltage Scaling (DVS) for system low power applications. <br /><br />The I<sup>2</sup>C interface let the RT8092 controllable flexibly to select V<sub>OUT</sub> voltage level, peak current limit level, PWM control mode, and so on. Other features include soft-start, auto discharge, lower internal reference voltage, over-temperature, and over-current protection.
RT8092 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>2.5V to 5.5V Input Range </li><li>Low Operation Quiescent Current <ul class="lv2"> <li></li><li>Normal Mode I<sub>Q</sub> < 60μA </li><li>Low Power Mode I<sub>Q</sub> < 15μA </li></ul> </li><li>Output range From 0.7V to 5.5V <ul class="lv2"> <li></li><li>Bank 1 : 0.7V to 1.4V </li><li>Bank 2 : 1.2V to 2.8V </li><li>Bank 3 : 2.4V to 5.5V </li><li>The Default Value is 2.8V (VSEL = High) and 1V (VSEL = Low) </li></ul> </li><li>4A Continuing Output Current </li><li>Support DVS in the Same Bank <ul class="lv2"> <li></li><li>V<sub>OUT</sub> Adjusting Range (max, min) is Settable </li></ul> </li><li>High Efficiency <ul class="lv2"> <li></li><li>90% at 5V→2.8V with 1.5A Load </li></ul> </li><li>3MHz Fixed-Frequency PWM Operation <ul class="lv2"> <li></li><li>Auto-PSM/PWM or Force-PWM Selectable </li></ul> </li><li>Support Remote Ground Sensing for Accurate Output Voltage </li><li>Dedicated Hardware Pin to Immediately Switch Nominal Output Voltage Setting </li><li>Output Discharging when Turning Off </li><li>Over-Current Protection <ul class="lv2"> <li></li><li>OC Level Settable </li></ul> </li><li>Over-Temperature Protection </li><li>Integrated Soft-Start Function </li><li>Enabling Control by Enable Pin and I<sup>2</sup>C Register Setting by Software </li><li>I<sup>2</sup>C Interface <ul class="lv2"> <li></li><li>I<sup>2</sup>C Communication Allowed Even in Off-State (EN = L) </li><li>Support Fast Mode (400kbps) </li><li>Registers Setting Retained in Off-State (EN = L) </li></ul> </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT8092 Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Cellular Telephones </li><li>Personal Information Appliances </li><li>Wireless and DSL Modems </li><li>MP3 Players </li><li>Portable Instruments </li></ul></div>
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