Recom REC5A DC-DC Converter, 5V dc/ 1A Output, 18 → 36 V dc Input, 5W, Through Hole, +100°C Max Temp -40°C Min

The REC5A series is cost efficient, general purpose isolated DC-DC converter containing a built-in Class A EMC filter. The converter is designed to run from industry standard 24 V or 5 V unregulated supplies and is typically used to provide an isolated, regulated, short circuit protected output.
Under Voltage Lockout is available as an option. These converters are designed for industrial applications, can drive high capacitive loads and operate over the full -40°C to +68°C temperature range without derating.

• 2:1 Input range voltage
• Efficiency up to 81%
• EMI Class A without external components
• Continuous Short Circuit Protection

To provide industrial equipment with a constant power supply of 5V DC, opt for this DC-DC converter from RECOM. It features a built-in EMC filter, so you know there's minimal chance of it interfering with the function of nearby electronic devices. For safety, its output is protected against short circuits, which reduces the risk of electrical faults causing damage to your machines. This converter has a non-conductive plastic housing to help safeguard you against shocks. As it's flame-retardant, it won't catch alight if there's a fire.

• Automatic recovery in the event of a short-circuit, so no need for manual intervention
• Able to drive high capacitive loads with a power rating of 5W
• Broad operating temperature range without derating of -40°C to +68°C, so suitable to use in harsh environments
• Regulated to help keep output voltage at the rated value, regardless of current input

• Solar power supplies
• Telecommunication and data centres
• Battery-powered industrial equipment

No, this converter needs no minimum load so you know its performance isn't affected by the power input.