New-Tech Europe Magazine | H2 2023

The lifetime of the battery can be calculated using the average load current and battery capacity.

The average load current can be calculated using the duty cycle of the system.

An active current is the system current when the wireless sensor node is active. To compare the two solutions, let’s assume the system wakes up once every two hours, performs the specific task, and enters sleep mode after. The system active current is 5 mA. The battery life depends on the duty cycle of the operation. Figure 5 shows the plot of the battery life of two schemes with different duty cycles, varying from 0.005% to 0.015%. In summary, this article addressed the critical role of managing battery power in the exploding world of IoT devices. It demonstrated that optimizing ship and sleep mode is one of the best ways to improve battery efficiency. The MAX16163 solution from ADI enables a design with a more precise control over those functions. It extends the battery life by about 20% (for a typical 0.007% duty cycle operation, as seen in Figure 5) and reduces the solution size to 60% as compared to a conventional approach.

Figure 5: A graph showing battery life vs. duty cycle of a wireless sensor node. Credit: Analog Devices

Discrete Solution Usi ngMAX31342,MAX16 150,andTPS22916

IntegratedSolution MAX16163

Specification

Coin Cell Capacity Shutdown Current

250 mAh

250 mAh

146 nA 170 nA

10 nA 30 nA

Sleep Current

3 (RTC + load switch+ battery freshness)

Number of ICs

1(MAX16163)

Crystal Oscillator

Required

Not required

130mm 2 (typical)

50mm 2 (typical)

Solution Size

Table 2: Comparison of Two Different Solutions Credit: Analog Devices

About the Author Suryash Rai has been working at Analog Devices as an applications engineer since 2016, where he supports the protection IC portfolio. He received his master’s degree in

communications engineering from the National Institute of Technology Karnataka, Surathkal. Suryash currently lives in San Jose, California, and enjoys cooking, traveling, and meeting new friends.

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