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The TPS629203 is a high-efficiency and highly flexible synchronous step-down buck converter in a small 1.6-mm × 2.1-mm SOT583 package. The TPS629203 can be configured to run 2.5 MHz or 1 MHz in either forced PWM mode or auto PFM/PWM mode. In 2.5-MHz auto PFM/PWM mode, TI AEE mode automatically adjusts the switching frequency based on both input and output voltage to hold a high efficiency through the whole operation range without the need of using different inductors. The device includes a Mode/S-CONF input to select different combinations of following: