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Light Load Efficient, Low Noise Power Supply Reference Design for Wearables and IoT
TIDA-01566
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
- Light Load Efficient Low Noise Power Supply Ref Design for Wearables and IoT
(PDF 2864 KB)
06 Feb 2018
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)
See the Important Notice and Disclaimer covering reference designs and other TI resources.
