Electrical Design Guidelines of the Power Supply
The electrical design of the power supply depends on a drained power source.
The electrical design guidelines categories are:
• +5V input (typically PC internal regulator output)
• +12V input (typically automotive)
• Battery
+5V Source Power Supply Design Guidelines
• The desired output for the power supply is 3.8V. since the difference between the
input source and the desired output is negligible, a linear regulator can be used.
A switching power supply will not be suitable because of the low drop out
requirements.
• If using a linear regulator, include a proper heat sink to dissipate the excess
generated power.
• A low ESR Bypass capacitor must be included to stop the current absorption peaks
near the Module. The recommended capacitor is 100μF .
• Make sure the low ESR capacitor on the power supply output is a minimum of 10V.
Figure 2: An example of linear regulator with 5V input
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