These buck (step-down) voltage regulators generate lower, user-selectable output voltages from an input voltage range of 4.5 to 24 V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and have a typical (when the output current is several amps) efficiency of approximately 90%, which is much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. The output voltage defaults to 5 V and can be changed to 3.3 V by jumping 3V3 SELECT.
The regulator has under-voltage and short-circuit protection, and thermal shutdown prevents damage from overheating. The board has reverse-voltage protection.
- input voltage: 4.5 V to 24 V
- typical continuous output current: 7 A (Actual continuous output current depends on thermal dissipation. See Output Current section below for details)
- output voltage selectable as 5 V or 3.3 V
- 700 kHz switching frequency
- 45 mA typical no-load quiescent current (300 µA typical quiescent current with ENABLE=0 V)
- integrated over-temperature and over-current shutoff
- small size: 1.9" × 0.6" × 0.3" (48 × 15 × 8 mm)
- weight without header pins: 0.2 oz (6 g)
Using the Regulator