Power Supply Subsystem for MAX30001-Based ECG Remote Patient Vital Sign Monitor
要約
This application note is part of a series providing guidance for its readers to implement and validate a proven switch-mode power supply circuit for use in remote vital sign monitoring devices using Maxim Biosensing Analog Front Ends (AFEs). This document focuses on a vital sign monitor using the MAX30001 ECG AFE. Within this application note, readers will find reference schematics and layout (in popular EDA and PDF formats), validation check lists, and trouble-shooting guideline.
The figure below, shows a block diagram where the MAX30001 AFE device requires two power channels to power the digital supply, analog supply, and the OVDD (Logic Interface Voltage) supply.
This subsystem passes the performance limit criteria as specified by IEC60601 201.12.4.4.106 System Noise testing.
Design Limits
Input (VBATT) | Output (VDIG, VANA) | Noise, RTO | ||
ViMIN | ViMAX | VoMIN | VoMAX | VPP(max) |
3.0V1 | 4.2V1 | 1.6V | 2.0V | 30mVPP |
1.0V2 | 3.4V2 | 1.6V | 2.0V | 30mVPP |
1: Secondary cell battery (LiPo)
2: Primary cell batteries: a) Li Coin cell 2.0V-3.4V, b) Zinc Air cell 1.3V-1.7V, and c) Ag Oxide cell 1.2V-1.6V
Design Configuration | Battery Implementation | Board Area Layout Considerations |
Discrete | Primary (Coin and Button Cell) Secondary (Li & LiPo) |
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Integrated | Secondary (Li & LiPo) |
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Discrete Power Supply Subsystems
Please use the following table and associated links to quickly access the discrete power supply subsystems of interest.
Battery TypesSMPS CircuitLink to ChecklistOutput Voltage | Input Power | Input Power | Input Power | Input Power |
1.8V | 2.0-4.2V Batteries | Li Ion (Primary Cell) LiPo (Secondary Cell) | MAX38640A | Discrete Design Description for 2.0V – 4.2V Batteries |
1.8V | 1.0-1.7V Batteries | Zn Air (Primary Cell) Ag Oxide (Primary Cell) | MAX17220 | Discrete Design Description for 1.0V – 1.7V Batteries |