TIDA-01566

Light Load Efficient, Low Noise Power Supply Reference Design for Wearables and IoT

TIDA-01566

Design files

Overview

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.

Features
  • Solution size of 8.5 mm2 and height below 0.65 mm
  • No load input current (switching IQ) of 8 µA
  • Near 100-µV output noise (10 Hz to 100 kHz)
  • Simple output voltage adjustment down to 0.5 VOUT
  • 2.6-V to 5.5-V VIN range for 1.2 VOUT
  • 300-mA LDO output current (1 A at DC/DC output)

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUE57.PDF (2864 K)

Reference design overview and verified performance test data

TIDRWO9.PDF (133 K)

Detailed schematic diagram for design layout and components

TIDRWP2.PDF (63 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRWP1.PDF (96 K)

Detailed overview of design layout for component placement

TIDCES2.ZIP (367 K)

Design file that contains information on physical board layer of design PCB

TIDRWP0.PDF (356 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS628001.8V-5.5V input, tiny, 1A ultra-low Iq step-down converter in 1.05 x 0.70mm chip scale package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS628011.8V-5.5V input, tiny, 1A ultra-low Iq step-down converter in 1.05 x 0.70mm chip scale package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS628021.8V-5.5V input, 1-A ultra-low Iq step-down converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS628061.8V-5.5V input, tiny, 600mA ultra-low Iq step-down converter in 1.05 x 0.70mm chip scale package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS628071.8V-5.5V input, 600-mA, ultra-low IQ step-down converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS628081.8V-5.5V input, 600-mA, ultra-low IQ step-down converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A10300-mA, low-VIN (0.75-V), ultra-low-IQ, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Light Load Efficient Low Noise Power Supply Ref Design for Wearables and IoT Feb. 06, 2018

Related design resources

Hardware development

EVALUATION BOARD
TPS62800EVM-892 Tiny 0.35-mm Pitch 1-A Step-Down Converters with 2.3-uA Iq Evaluation Module (3 circuits) TPS7A10EVM-004 TPS7A10 300-mA low-IQ ultra-low-dropout (LDO) linear regulator evaluation module

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