Buck regulator and two inductors make dual-polarity converter - EDN
Space-Saving, Dual Output DC/DC Converter Yields Plus/Minus Voltage Outputs with (Optional) I2C Programming | Analog Devices
DC-DC Step UP Down Power Supply Module Adjustable 20W Boost Buck Voltage Converter
Buck Boost Converter 2 Modes PCB Dual Output Power Module For Power Supply Hot | eBay
Amazon.com: CoCocina 3Pcs Dd39Ajpa 2 in 1 20W Boost Buck Dual Output Voltage Module 3.6-30V to ±3-30V Adjustable Output Dc Step Up Step Down Converter Board : Electronics
Dual Rail ±12V DC/DC Converter | Climbers.net
Dual-output buck-boost converter with positive and negative output voltages under single positive voltage source fed | Semantic Scholar