Pololu 3.3V Step Up Down Voltage Regulator

The Pololu 3.3V Step Up/Down Voltage Regulator provides a stable 3.3 volt power supply from a range of input voltages.

This compact module has a switching power regulator that outputs a fixed 3.3 volt power supply from an input between 2.7 and 11.8 volts. The regulator has a typical efficiency of over 90% and can deliver currents up to 1 amp. Features include overheating and short-circuit protection. It does not have reverse voltage protection.

Use this tiny module to power 3.3V circuitry from you your robot's batteries.

This module comes with two sets of optional male header pins that require soldering.

Usage

Connect a 2.7-11.8 volt input power supply to the voltage input (VIN) and common ground (GND) pins. The regulated 3.3V output will be available at the voltage output (VOUT) pin. To take advantage of the optional shutdown feature, connect a digital signal to the shutdown (SHDN*) pin. When the shutdown pin is high the regulator will be turned off. Leave the shutdown pin disconnected to keep the regulator on all the time.

Note that this regulator can get very hot during normal operation. Please use care when handling this product.

LC Voltage Spikes

This regular can be destroyed when the input power exceeds the maximum. A capacitor can protect against LC voltage spikes when operating with an input voltage greater than 9V, using a power cable longer than a few inches or using a high inductance power supply.

To protect against LC voltage spikes, wire a 33 µF or greater electrolytic capacitor close to the regulator between pins VIN and GND. The capacitor should be rated at least 16V. Please see the Pololu "Understanding Destructive LC Voltage Spikes" for more information.

References

• Understanding Destructive LC Voltage Spikes

Voltage Regulator
Input Voltage	2.7-11.8 V
Output Voltage	3.3V (+5/-3%)
Regulator	S7V8F3
Maximum Current	1 A
Maximum Quiescent Current	0.1 mA
Regulation Method	Switching
Typical Efficiency	90%
Load Shutdown Option	Yes
Short-Circuit Protection	Yes
Reverse Polarity Protection	No
Dimensions
Size	0.45 × 0.65 × 0.1 in
Weight	0.6 g

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