ADP5003 Low Noise Micro PMU

ADI’s ADP5003 integrates a high voltage buck regulator and an ultra-low noise low dropout (LDO) regulator. The buck regulator is optimized to operate at high output currents up to 3 A. The LDO is capable of a maximum output current of 3 A and operates efficiently with low headroom voltage while maintaining high power supply rejection. The ADP5003 can operate in one of two modes: adaptive mode or independent mode. Adaptive mode allows the LDO to operate with a set headroom by adjusting the buck output voltage internally. Alternatively, the ADP5003 can operate in independent mode, where both regulators operate separately from each other, and where the output voltages are programmed using resistor dividers. The LDO regulator output can be accurately controlled at the point of load (POL) using remote sensing that compensates for the printed circuit board (PCB) trace impedance while delivering high output currents. Each regulator is activated via a dedicated precision enable input. The buck switching frequency can be synchronized to an external signal, or programmed with an external resistor. Safety features in the ADP5003 include thermal shutdown (TSD) and input undervoltage lockout (UVLO). This PMU is rated for a -40°C to +125°C operating junction temperature range and comes in a small, 5 mm x 5 mm, 32-lead LFCSP package. The ADP5003 is an ideal solution to provide highly efficient and quiet regulated supplies for low noise power applications found in analog-to-digital converters (ADCs), RF transceivers, and clocking ICs.