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The RT6263A/B is a simple, easy-to-use, 3A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 17V. The device possesses an accurate reference voltage and integrates low R<sub>DS(ON)</sub> power MOSFETs to achieve high efficiency.<br />The RT6263A/B adopts Advanced Constant On-Time (ACOT<sup>®</sup>) control architecture to provide an ultrafast transient response with few external components and to operate at nearly constant switching frequency over the line, load, and output voltage range. The RT6263A operates in automatic PSM that maintains high efficiency during light load operation. The RT6263B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements.<br />The RT6263A/B senses both FETs current for a robust overcurrent protection (OCP). The device features cycle-by-cycle current-limit protection to prevent the device from the catastrophic damage in output short circuit, overcurrent or inductor saturation conditions. The RT6263A/B offers programmable start-up by connecting a capacitor at external SS pin. The device also includes input undervoltage lockout, output undervoltage protection, and over-temperature protection (OTP) to provide safe and smooth operation in all operating conditions.<br />The recommended junction temperature range is -40°C to 125°C.
RT6263A/RT6263B Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>3A Converter Integrated 66mΩ and 36mΩ FETs </li><li>Input Supply Voltage Range: 4.5V to 17V </li><li>Output Voltage Range: 0.765V to 7V </li><li>Advanced Constant On-Time (ACOT<sup>®</sup>) Control <ul class="lv2"> <li></li><li>Ultrafast Transient Response </li><li>Optimized for Low-ESR Ceramic Output Capacitors </li></ul> </li><li>High Accuracy Feedback Reference Voltage: Typ. ± 1% </li><li>Optional for Operation Modes: <ul class="lv2"> <li></li><li>RT6263A: Power Saving Mode (PSM) </li><li>RT6263B: Forced PWM Mode </li></ul> </li><li>Fixed Switching Frequency: 650kHz </li><li>Enable Control and Externally Adjustable Soft-Start </li><li>Input Undervoltage Lockout (UVLO) </li><li>Protection Function <ul class="lv2"> <li></li><li>Output Undervoltage Protection (UVP) with Hiccup Mode </li><li>High-/Low-side MOSFET OCP and OTP Function </li></ul> </li><li>Power Good Indication </li></ul></div>
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RT6263A/RT6263B Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Set-Top Boxes </li><li>LCD TVs </li><li>Home Networking Devices </li><li>Surveillance </li><li>General Purpose </li></ul></div>
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