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The RT2657BQ is a high efficiency Pulse-Width-Modulated (PWM) step-down DC/DC converter, capable of delivering 600mA output current over a wide input voltage range from 2.7V to 5.5V. The RT2657BQ is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources such as cellular phones, PDAs, hand-held devices, game console and related accessories. The internal synchronous rectifier with low R<sub>DS(ON)</sub> dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical applications. The RT2657BQ enters Low Dropout Mode when normal Pulse -Width Mode cannot provide regulated output voltage by continuously turning on the high-side P-MOSFET. The RT2657BQ 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 operating frequency of 2.25MHz. </p>The RT2657BQ is available in the small WDFN-8L 3x3 package.</p>
RT2657BQ Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>V<sub>IN</sub> Range 2.7V to 5.5V </li><li>V<sub>OUT</sub> Range 0.6V to 5.5V (100% Duty Ratio Operation) </li><li>V<sub>REF</sub> = 0.6V </li><li>I<sub>SD</sub> ≤ 5μA (V<sub>EN</sub> = 0V) </li><li>Current Mode Control, Internal Compensation </li><li>Fixed F<sub>SW</sub> 2.25MHz </li><li>R<sub>DS(ON)</sub> 230mΩ HS/250mΩ LS (P-MOSFET/N-MOSFET) </li><li>Enable (V<sub>IH</sub> = 1V, V<sub>IL</sub> = 0.4V) </li><li>Internal Soft-Start (0.3ms) </li><li>Up to 600mA Output Current </li><li>Up to 90% Efficiency </li><li>Peak I<sub>LIMIT</sub> (1.5A Typical / 0.8A Min); UVLO; UVP; V<sub>IN</sub> and V<sub>OUT</sub> OVP; and OTP (150°C) </li><li>No Schottky Diode Required </li><li>Internal Compensation to Reduce External Components </li><li>AEC-Q100 Grade 3 Certification </li></ul></div>
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RT2657BQ Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Automotive Audio, Information & Navigation </li><li>Industrial-Grade General Purpose Point-of -Load </li></ul></div>
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