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

(ACTIVE) TIDA-01566

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Key Document

Description

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)

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Schematic/Block Diagram

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Design Files

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Bill of Materials (BOM)

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS62800  1-A Ultra-Low IQ Step-Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS62801  Tiny, 1A Ultra-Low Iq Step-Down Converter in 1.05 x 0.70mm Chip Scale Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS62802  1-A Ultra-low Iq Step-down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS62806  600-mA, Ultra-Low IQ Step-Down Converter  Step-down (buck)  Sample & Buy Not Available
TPS7A10  300mA low-Vin low-Vout ultra-low-dropout regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TPS62800 Download -
TPS62801 Download -
TPS62802 Download -
TPS62806 Download -
TPS7A10 Download -
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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 2864 06 Feb 2018 0
Design files (5)
Title Abstract Type Size (KB) Date Views
PDF 63 11 Jul 2018 0
PDF 96 11 Jul 2018 0
PDF 356 11 Jul 2018 0
ZIP 367 11 Jul 2018 0
PDF 133 11 Jul 2018 0
Related Tools & Software

Design Kits & Evaluation Modules  ( 2 )

Name Part Number Tool Type
TPS7A10 300mA low-Vin low-Vout ultra-low-dropout regulator evaluation module  TPS7A10EVM-004  Evaluation Modules & Boards 
Tiny 0.35-mm Pitch 1-A Step-Down Converters with 2.3-uA Iq Evaluation Module (3 circuits)  TPS62800EVM-892  Evaluation Modules & Boards 

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