Holybro UBEC (3-14S)

The Holybro UBEC is a high-efficiency synchronous step-down regulator that turns a 3S to 14S LiPo supply into a stable, selectable low-voltage rail for flight controllers, receivers, servos, GPS units and other onboard electronics. Choose the 5A version for compact avionics power, or the 12A version for servo banks and higher-current devices.

Key features

• Over 90% conversion efficiency for low heat inside the airframe

• Protection against over-current, output short circuit, overheating and low input voltage

• 5A option: 5.2V, 8V or 12V output, selected by bridging solder pads; 5A at 5.2V, 4A at 8V or 2.8A at 12V continuous, 10A burst

• 12A option: 6.0V, 7.2V, 8.0V or 9.2V output, selected by onboard DIP switches; 12A continuous, 24A burst; four parallel servo header outputs plus an XT30 output, in a metal housing for heat dissipation and lower EMI

Specifications

• Input voltage: 3-14S LiPo (both options)

• 5A option operating input: 8-60 V with TVS protection

• 5A option size and weight: 35 x 24 x 6.5 mm, 6.7 g

• 12A option input connector: XT30

• 12A option size and weight: 48 x 33.6 x 16.3 mm, 47.8 g

• 12A option includes: XT30 18AWG cable, DuPont 3-pin cable

For a stable 12V output from the 5A version, feed it at least 14V, as the regulator needs about 2V of headroom. The 12A version's servo headers let a servo bank draw its current from the UBEC instead of the flight controller's own regulator.