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The RT7249 is a high efficiency, monolithic synchronous step-down DC/DC converter with a power switch. The Buck converter can deliver up to 3A output current from 4.5V to 18V input supply. The RT7249's current-mode architecture and external compensation allow the transient response to be optimized over a wide input range and loads. Cycle-by-cycle current limit provides protections against shorted output and soft-start eliminates input current surge during start-up. The RT7249 also provides under-voltage protection and thermal shutdown. PWM frequency is adjustable by the ROSC pin and Power Switch current limit can also be adjusted by the RLIM pin. The low current (<3μA) in shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7249 is available in the WQFN-16L 4x4 package.
RT7249 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Buck Regulator <ul class="lv2"> <li></li><li>4.5V to 18V Input Voltage Range </li><li>3A Output Current </li><li>Internal N-Channel MOSFETs </li><li>Current Mode Control </li><li>Adjustable PWM Frequency </li><li>Adjustable Output from 0.8V to 15V </li><li>Adjustable Soft-Start Time </li><li>Stable with Ceramic Output Capacitors </li><li>Cycle-by-cycle Current Limit </li><li>Input Under-Voltage Lockout </li><li>Output Under-Voltage Protection </li><li>Thermal Shutdown </li></ul> </li><li>Power Switch <ul class="lv2"> <li></li><li>±15% Current-Limit Accuracy at 1.2A </li><li>Adjustable Current Limit : 75mA to 2580mA </li><li>Meet USB Current-Limiting Requirements </li><li>Reverse Input-Output Voltage Protection </li><li>Built-in Soft-Start </li><li>120mΩ High-Side MOSFET </li><li>Operating Range : 2.5 V to 5.5 V </li></ul> </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT7249 Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Wireless AP/Router </li><li>Set-Top-Boxes </li><li>Industrial and Commercial Low Power Systems </li><li>LCD Monitors and TVs </li><li>Green Electronics/Appliances </li><li>Point of Load Regulation of High-Performance DSPs </li><li>USB Bus/Self Powered Hubs </li><li>USB Peripheral Ports </li><li>ACPI Power Distribution </li><li>Battery Power Equipment </li><li>3G/3.5G Data Card </li></ul></div>
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