Here is an article for Simple 5V to 3.3V Converter Circuit using IC LD33V.
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.
The circuit is good for microcontrollers and sensors.
Circuit Working:
Parts List:
| Component | Value | 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.
Ground pin connect to common ground.
A 0.1uF capacitor is at input side and a 10uF capacitor is at output side.
These capacitors remove noise and they keep voltage stable.
LED with resistor shows power ON and they light only when 3.3V is available.
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
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:
- Gather all the parts as shown in circuit diagram.
- LD33V Pin 1 is Ground so connect it to GND line.
- LD33V Pin 2 is Vout connect to 3.3V output line.
- LD33V Pin 3 is Vin connect to 5V input.
- Place C1 0.1uF capacitor between Vin and GND.
- Place C2 10uF capacitor between Vout and GND.
- Connect LED anode to 3.3V line.
- Connect R1 resistor from LED cathode to GND.
- Connect all grounds together.
Conclusion:
This Simple 5V to 3.3V Converter Circuit using IC LD33V is very easy.
It is very cheap and gives stable 3.3V from 5V supply.
Good for small electronics and is also good for students.
This circuit is easy to build as it works with very few parts.