Here, is an article for Simple 5V to 3.3V Converter Circuit using IC LD33V, also this circuit is cheap, works from 5V input and it uses LD33V voltage regulator IC.
We just need to take a phone charger and put a charger output to regulator input and then regulator will gives stable 3.3V output which is very easy; further the circuit is good for microcontrollers and sensors.
Circuit Working:
Parts List:
| Components | Values | Quantity |
|---|---|---|
| Resistor | 220Ω | 1 |
| Capacitors | Electrolytic 10uF 25V | 1 |
| Ceramic 0.1uF | 1 | |
| Semiconductors | Voltage Regulator IC LD33V | 1 |
| LED any 5mm | 1 |
This circuit gives 5V to the LD33V Vin pin and the regulator makes output 3.3V at Vout pin and then ground pin connects to common ground.
After that, a 0.1uF capacitor is at input side and a 10uF capacitor is at output side and these capacitors remove noise and they keep voltage stable.
LED with resistor shows power ON and they light only when 3.3V is available and then resistor limits LED current.
Formulas with Calculation:
LED current formula: I = V / R
Voltage across resistor = 3.3V – 2.0V for red LED = 1.3V
If resistor is 220 ohm: I = 1.3 / 220 = 0.0059A approx 6mA
This is safe current for LED.
Power dissipation for regulator: P = (Vin – Vout) × Iload
If input = 5V
Output = 3.3V
Load current = 100mA
P = (5 – 3.3) × 0.1 = 0.17W
Hence, this is low heat and regulator will work fine.
How to Build:
To build a Simple 5V to 3.3V Converter Circuit using IC LD33V follow the below connection steps:
- First, gather all the parts as shown in circuit diagram.
- Next, connect LD33V pin 1 GND to the ground line, connect pin 2 Vout to the 3.3V output line, and connect pin 3 Vin to the 5V input.
- Then place C1 0.1uF capacitor between Vin and GND and also place C2 10uF capacitor between Vout and GND.
- Now connect LED anode to 3.3V line and then connect R1 resistor from LED cathode to GND.
- Finally, connect all grounds together.
Conclusion:
To conclude, this Simple 5V to 3.3V Converter Circuit using IC LD33V is very easy, as it is very cheap and gives stable 3.3V from 5V supply.
Circuit is good for small electronics, good for students and is also is easy to build as it works with very few parts.