This reference design demonstrates an ultra-small power supply solution (8.5 mm2 total) for an efficient and low-noise rail in portable personal electronic devices, such as wearables, smart watches, smartphones, headsets, headphones, earbuds, and camera modules. A low dropout (LDO) linear regulator follows a DC/DC converter to deliver the same low-noise performance of an LDO with the high efficiency of a DC/DC converter. The overall no load input current (also known as switching IQ) of only 8 µA maintains higher efficiency than an LDO-only based design, while the near 100-µV output noise cleanly powers the sensitive load better than a DC/DC-only design. This design guide documents and compares the critical performance characteristics, such as efficiency, IQ, ripple, and so forth, of all three design types: LDO only, DC/DC only, and LDO after DC/DC.
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Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
| Type | Title | Date | |
|---|---|---|---|
| * | Design guide | Light Load Efficient Low Noise Power Supply Ref Design for Wearables and IoT | Feb. 06, 2018 |
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