Isolated power and data interface for low-power applications reference design TIDA-010018 (ACTIVE)

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Key Document

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

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Design Files

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Parametrics
 TIDA-010018.1
(Output Voltage 1)
TIDA-010018.2
(Output Voltage 2)
Vin (Min) (V)4.44.4
Vin (Max) (V)5.255.25
Vout (Nom) (V)3.33.3
Iout (Max) (A).01.01
Output Power (W).033.033
Isolated/Non-IsolatedNon-IsolatedIsolated
Input TypeDCDC
TopologyBuck- SynchronousBuck- Synchronous
Half Bridge- Hard Switched

TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ISO7041  Ultra-low power four-channel digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
TPS60402  60mA Charge Pump Voltage Inverter with Fixed 50kHz Operation  DC/DC switching regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS62125  3V-17V, 300mA Buck Converter With Adjustable Enable Threshold And Hysteresis  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS62745  3.3V-10V input, 300mA Ultra Low Iq step-down converter with VSEL and input voltage switch  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS727  250-mA, Ultralow IQ, Fast Transient Response, RF Low-Dropout Linear Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ISO7041 Download
TPS60402 Download Download
TPS62125 Download Download
TPS62745 Download Download
TPS727 Download -
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Technical Documents

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Datasheet (1)
Title Type Size (KB) Date
PDF 3149 19 Dec 2018
Application notes (1)
Title Type Size (KB) Date
PDF 69 23 May 2019
User guides (1)
Title Type Size (KB) Date
PDF 2267 30 Jan 2019
Design files (6)
Title Type Size (KB) Date
ZIP 762 30 Jan 2019
ZIP 1515 30 Jan 2019
PDF 1213 30 Jan 2019
PDF 212 30 Jan 2019
PDF 57 30 Jan 2019
PDF 1417 30 Jan 2019

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