Analog Devices ADP5133 Dual Buck Regulator integrates two high-performance 800mA buck regulators in a tiny, 16-ball, 2mm × 2mm WLCSP package to meet demanding performance and board space requirements. ADP5133 operates from an input voltage range of 2.3V-5.5V and a BUCK1/BUCK2 output voltage range from 0.8V-3.8V. The two buck regulators operate out-of-phase to reduce the input capacitor requirement and noise. The high switching frequency of ADP5133 enables tiny multilayer external components and minimizes the board space. The regulators in the ADP5133 are activated through dedicated enable pins and achieve ±1.8% accuracy. The output voltages can be externally set through a resistor feedback network. When the MODE pin is set high, and the load current falls below a predefined threshold, ADP5133 operates in power save mode (PSM) to improve the light-load efficiency. ADP5133 achieves 3MHz buck operation in forced PWM and auto PWM/PSM modes. The design makes the ADP5133 Dual Buck Regulator well-suited for power for processors, ASICS, FPGAs, and RF chipsets, portable instrumentation & medical devices, and space-constrained devices.