It’s recommended that users pick a regulator capable of 2A+ for the modem alone; all other user
peripherals should be in addition to the 2A+ regulator.
3A Low Noise Buck-Boost DC/DC Converter
2A High PSRR Ultra low drop linear regulator with reverse
current protection
Proper layout and design of switching regulators are critical to reduce conducted and radiated
emission on-board. These are often coupled onto the power and antenna of the Modem
increasing RSSI and impeding successful transmission. We highly recommend an RF CAN
over any switching regulator to eliminate the risk of radiated emissions from the switcher. An
example RF CAN and proper layout is pictured below.
November 2021 Swarm M138 Modem Manual - Rev 1.00 22/77
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