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The RT6338E/EH family are high efficiency synchronous step-down DC-DC converters with pseudo constant switching frequency 500kHz and deliver up to 8A output current. The RT6338E/EH operate from 4.5V to 23V input voltage. The output voltage of RT6338E/EH is fixed to 3.36V output voltage.<br /><br />The RT6338E/EH adopts Advanced Constant On-Time (ACOT<sup>®</sup>) control architecture that provides ultra-fast transient response and further reduces the external component count. In steady states, the ACOT<sup>®</sup> operates at nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier.<br /><br />By setting the voltage of the EN/MODE pin, RT6338E/EH operates either in diode emulation mode (DEM) or ultrasonic mode (USM) at light load. The USM maintains operation frequency above 25kHz, which eliminates the acoustic noise. In the DEM, RT6338E/EH provides the best light-load efficiency and improves the acoustic noise with spread spectrum function.<br /><br />RT6338E/EH provides PGOOD indicator for easy system sequence control. Full protection features are also integrated in the device, including the cycle-by-cycle current limit, OVP, UVP, input UVLO and OTP.<br /><br />All above functions are integrated in a UQFN-23L 3x3 (FC) package.
RT6338E/RT6338EH Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Input Voltage Range <ul class="lv2"> <li></li><li>RT6338E/EH: 4.5V to 23V </li></ul> </li><li>Output Voltage <ul class="lv2"> <li></li><li>RT6338E/EH: 3.36V </li></ul> </li><li>8A Continuous Output Current </li><li>Stable with POSCAP and MLCC Capacitor </li><li>Fast Transient Response </li><li>Diode Emulation Mode (DEM) for Power Saving </li><li>Ultrasonic Mode (USM) for Avoiding Acoustic Noise </li><li>Pseudo Constant Switching Frequency 500kHz in CCM </li><li>Internal Power MOSFET Switch 26mΩ (high-side) and 14mΩ (low-side) </li><li>LDO <ul class="lv2"> <li></li><li>RT6338E/EH: 3.3V/100mA </li></ul> </li><li>Overcurrent Limit <ul class="lv2"> <li></li><li>RT6338E/EH: 12A </li></ul> </li><li>Output Under-/Overvoltage Protection (UVP/OVP) <ul class="lv2"> <li></li><li>RT6338E: Latched Mode UVP/OVP </li><li>RT6338EH: Hiccup Mode UVP and Non-Latched Mode OVP </li></ul> </li><li>Input Undervoltage Lockout (UVLO) </li><li>Over-Temperature Protection (OTP) <ul class="lv2"> <li></li><li>RT6338E: Latched Mode OTP </li><li>RT6338EH: Non-Latched Mode OTP </li></ul> </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Laptop Computers </li><li>Tablet PCs </li><li>Networking Systems </li><li>Servers </li><li>Personal Video Recorders </li><li>Flat Panel Television and Monitors </li><li>Distributed Power Systems </li></ul></div>
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