5V to 1.5V Converter Circuit
Learn how to convert 5V DC to 1.5V using a simple step-down (buck) converter. Perfect for low-power electronics like sensors, LEDs, and microcontroller peripherals.
dc to dc step down 5v to 1.5v
A step-down voltage regulator like LM317 or a buck converter IC can be used to make 5V into 1.5V. They are circuits where the voltage can be reduced, and on the 1.5V devices, which present a stable current source. They also help guard against overvoltage damage of low voltage circuitry and can be observed in battery-powered equipment and embedded systems. Heat management and selection of the components will give good performance.
Formula & Table Summary:
- Using LM317: Vout = 1.25 × (1 + R2/R1)
- Fixed Buck Converter: No external resistors needed, preset 1.5V output
- Power Dissipation: P = (Vin - Vout) × Iload
5v to 1.5v converter circuit
A 5V to 1.5V converter is a very basic DC-DC step-down (buck) circuit that is used in order to power low-voltage, 1.5V devices such as low-voltage WiFi sensors, or logic chips out of 5V power, such as USB. This circuit is quite efficient at controlling the voltage using a regulatable regulator such as the LM317 or a specific regulator IC such as a buck converter. This is usually applied in embedded systems, battery power equipment, and applications with microcontrollers.
5v to 1.5v regulator
| Input Voltage | Output Voltage | Output Current | Power Dissipation |
|---|---|---|---|
| 5V | 1.5V | 500mA | 1.75W |
| 5V | 1.5V | 300mA | 1.05W |
Frequently Asked Questions - 5V to 1.5V Converter Circuit:
Can I use an LM317 to convert 5V to 1.5V?
Yes, with proper resistor values, LM317 can output 1.5V from 5V.
What is the efficiency of a 5V to 1.5V buck converter?
Typically around 80–95%, depending on the load and design.
Is 1.5V safe for LEDs?
Only if the LED forward voltage is ≤1.5V; otherwise use a resistor or boost.
Can I use this to power a watch?
Yes, many watches run on 1.5V and need low current, which this converter can handle.
What type of regulator is best?
Switching regulators are more efficient than linear for larger current loads.
How do I test the output voltage?
Use a multimeter set to DC voltage across the output terminals.
Do I need a heatsink for 5V to 1.5V?
For linear regulators under heavy load, yes. For switch-mode, usually not.
Can I step down USB 5V to 1.5V?
Yes, with a buck converter or LDO regulator like AMS1117-1.5.
What components are needed?
Typically a regulator IC, input/output capacitors, and sometimes resistors.
Is 1.5V enough to run a microcontroller?
Some ultra-low-power MCUs can operate at 1.5V, but most need ≥1.8V.
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