I used this 5V USB step-down converter module which is based on the KIS3R33S module in my robot projects since two years and it works perfect for me. Before I used this module I had problems to power the robot and the Raspberry Pi from a single source like a RC accu pack. I always had problems that the power supply was not stable enough for the Raspberry Pi and the RaPi crashes very often. But with this cheap and small step-down converter the problems are gone.

The output voltage of 5.01V and 2.5A continuous output is enough to power the Raspberry Pi with a USB WIFI dongle and a Raspberry Pi camera module. I never needed the peak output current of 4A of this step-down converter. This module has a USB recognition. The module uses the original Sanyo low ESR filter capacitor voltage as low as possible so that the ripple 30mV, fully capable and linear power comparable.

Step-Down Converter

Step-Down Converter

I did some tests over 48 hours with the step-down converter and it never got hot or the Raspberry Pi crashes due to power supply problems. I like this small module because it has such a high output current of 3A to power the Raspberry Pi easily. The input voltage of 7V – 24V is enough to use the module with a wide range of power banks or RC accus. This makes the module very interesting not only for robot projects but as well a power supply in your car for your tablet or smart phone.

Step-Down Converter Specification

This are the specification of the module I bought for my robots.

Modules nature: non-isolated buck
Input voltage: DC 7V – 24V
Output voltage: DC 5V
Output current: 4A(short time)
Conversion efficiency: 96% (MAX)
Output ripple: 30mV(max)
Operating temperature: -40°C to +85°C
Size: 60 x 21 x 14mm
Protection: With overcurrent protection
Voltage regulation: ± 2.5%
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