Pololu 5V Step-Up/Step-Down Voltage Regulator S9V11F5

The S9V11x family of efficient switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) use a buck-boost topology to convert both higher and lower input voltages to a regulated output voltage. They take input voltages from 2 V to 16 V and increase or decrease them as necessary, offering a typical efficiency of over 85% and a typical output current of up to 1.5 A. The flexibility in input voltage offered by this family of regulators is especially well-suited for battery-powered applications in which the battery voltage begins above the regulated voltage and drops below as the battery discharges. Without the typical restriction on the battery voltage staying above the required voltage throughout its life, new battery packs and form factors can be considered.

The different members of this family offer different output voltage options, from fixed voltages with selectable alternatives to adjustable voltages that can be set anywhere between 2.5 V and 9 V using a precision 11-turn potentiometer. Some versions also have an adjustable low-voltage cutoff that can be set anywhere in the 2 V to 16 V output voltage range and used to prevent your battery from over-discharging. This is particularly useful for battery chemistries that can be damaged when over-discharged, including Li-ion and LiPo. The chart below lists all the regulators in the S9V11x family along with the key features of each version:

	2.5 V – 9 V (fine-adjust)
	3.3 V (5 V selectable)	fine-adjust
		3.3 V (5 V selectable)	3 V (fixed)
		0.3" × 0.45" × 0.15"1
Weight:	0.5 g1

General specifications

Identifying markings

Notes:

1

Without included optional headers.

2

Note: the minimum startup voltage is 3V, but the regulator can operate down to 2V after startup.

3

Under typical conditions, where the input voltage is close to the output voltage. Maximum output current can be higher when stepping down and lower when stepping up.

4

With no load. Actual quiescent current depends on input voltage; it is typically under 100 µA for input voltages less than 7 V.

File downloads

• Dimension diagram of the Pololu 5V Step-Up/Step-Down Voltage Regulator S9V11F5 (138k pdf)

• 3D model of the Pololu 5V Step-Up/Step-Down Voltage Regulator S9V11F5 (3MB step)

• Drill guide for the Pololu 5V Step-Up/Step-Down Voltage Regulator S9V11F5 (16k dxf)

  This DXF drawing shows the locations of all of the board’s holes.