Isolated power and data interface for low-power applications reference design
TIDA-010018
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Key Document
- Isolated power and data interface for low-power applications reference design
(PDF 2267 KB)
30 Jan 2019
Description
This reference design provides power and data isolation for low and ultra-low power applications. Generating isolated and non-isolated power rails with a high efficiency and containing a power efficient isolated data interface for three forward- plus one reverse-direction channels. Targeted applications are isolated loop powered 4- to 20-mA transmitters. This design can be adapted to other applications requiring highly-efficient power conversion and isolated data transmission while being powered from sources with a limited current capability.
Features
- Power input 5 VDC, source needs to be current limited to < 30 mA
- Ultra-low power, isolated data interface
- 5, 16, 130 μA per channel at 10, 100, 1000 kbps
- 3 forward-channels, 1 reverse-channel
- Isolated 10-mA DC/DC Converter
- Efficiency up to 86.5%
- 3.3-V, 10-mA buck converter on non-isolated side
- Efficiency up to 93%, VOUT ripple < 15 mVpp
- 3.3-V, 10-mA buck converter on isolated side
- Efficiency up to 92%, VOUT ripple < 20 mVpp
- 3.0-V, 10-mA LDOs
- IQ = 16 μA @ Iout = 1 mA
- PSRR > 36 dB at ≤ 200 kHz
See the Important Notice and Disclaimer covering reference designs and other TI resources.