Analog Devices ADP5003 Low-Noise μPMU Buck Regulator
Analog Devices' ADP5003 Low-Noise µPMU combines a high voltage buck regulator and ultra-low-noise LDO to improve efficiency and thermal performance while reducing noise in high-speed data converters and RF transceivers. Both regulators are capable of output current up to 3 A from wide input voltages, and they can be operated independently or in adaptive mode, which adjusts the output of the buck regulator to provide the LDO with a set headroom. This removes switching ripple while ensuring optimal efficiency and high PSRR for any output current. The high-efficiency buck regulator can switch from 300 kHz to 2.5 MHz using an internal oscillator or external signal and can output from 0.6 V to 5 V. The LDO outputs from 0.6 V to 3.3 V with 3 µVRMS output noise, ±1.5% accuracy, and remote sensing.
- Input Voltage: 4.2 V to 15 V (buck), 0.65 V to 5 V (LDO)
- Adaptive mode: controls LDO headroom for optimal efficiency and PSRR
- Buck fSW: 0.3 MHz to 2.5 MHz (internal oscillator or external sync)
- Buck VOUT: 0.6 V to 5.0 V
- LDO VOUT: 0.6 V to 3.3 V
- LDO VOUT noise: 3 µVRMS
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