Name: LM317 Adjustable Buck Voltage Regulator – Easyelecmodule
Price: 0.99 USD
Availability: InStock

LM317 Adjustable Buck Voltage Regulator

$0.991 pcs

lm317 Adjustable voltage regulator power supply board 4.2-40V to 1.2-37V adjustable buck power supply 1.5A current LDO linear voltage regulator module

Dimensions

35.6 × 16.8 mm

Brand

easyelecmodule

1451 in stock

Introduction

This is LM317 adjustable regulated power supply board that uses a linear voltage regulator. Since it’s linear, its efficiency isn’t extremely high — to boost efficiency, there needs to be a 3V voltage difference between input and output. However, the maximum voltage difference between input and output should not exceed 30V.

This module can replace all fixed 3-terminal regulators like the 7805, 7806, 7809, 7812, and 7824. It also works as a car-mounted power supply: just connect the module’s input to your car’s cigarette lighter port, then turn the potentiometer to adjust the output voltage (from 1.25V to 30V) — it can power devices like phones, MP3s, MP4s, and PSPs, making it super simple and convenient.

It’s perfect for powering your electronic devices: if your device needs 1.25V-60V, but you only have a 12V or 24V battery on hand, this module can step the voltage down to 1.25V-30V to solve your problem. It’s also great as a front-end power supply for projects: if your project requires 1.25V-30V but your input voltage is too low, this module is your top choice.

Main Parameter

Parameter	Details
Output Current	1.5A (minimum), 2.2A (typical)
Input-Output Voltage Difference (VI-VO)	40Vdc (maximum)
Adjustable Output Voltage Range	1.2~37V
Operating Temperature (1)	-55°C to +150°C
Current Output	1.5A
Input Voltage	4.2~40V
Operating Temperature (2)	0°C ~ 125°C
Characteristic Frequency	100 MHz
Module Dimensions	35.6mm × 16.8mm
Input Connection	VIN (positive input), GND (negative input)
Output Connection	VOUT (positive output), GND (negative output)
Maximum Output Current	Maximum Output Current = 3 / (Input Voltage – Output Voltage)

Wiring Description

Important Notes

This module uses a linear regulator, so its efficiency isn’t very high. To improve efficiency, you need a 3V voltage difference between the input and output. But the maximum voltage difference between input and output must be less than 30V (like Input – Output ≤ 30V). Otherwise, the module could burn out easily!

Since this is a linear step-down DC-DC circuit, the input voltage must be at least 3V higher than the output voltage to ensure stable output.

Adjustment Steps

First, correctly connect the input power (which should be between 4.5V and 40V).
Use a multimeter to monitor the output voltage, then turn the potentiometer:
- Turn counterclockwise to increase the voltage.
- Turn clockwise to decrease the voltage.
When adjusting the voltage, make sure to set the desired voltage before connecting any load!

LM317 Regulator Datasheet and Schematic

If you want to learn more LM317 regulator detail, you can refer to this datasheet.

Application

ATCA Solutions
DLP: 3D Biometrics, Hyperspectral Imaging,

Optical Networking, and Spectroscopy

DVR and DVS
Desktop PC
Digital Signage and Still Camera
ECG Electrocardiogram
EV HEV Charger: Level 1, 2, and 3
Electronic Shelf Label
Energy Harvesting
Ethernet Switch
Femto Base Station
Fingerprint and Iris Biometrics
HVAC: Heating, Ventilating, and Air Conditioning
High-Speed Data Acquisition and Generation
Hydraulic Valve
IP Phone: Wired and Wireless
Intelligent Occupancy Sensing
Motor Control: Brushed DC, Brushless DC, Low
Voltage, Permanent Magnet, and Stepper Motor
Point-to-Point Microwave Backhaul
Power Bank Solutions
Power Line Communication Modem
Power Over Ethernet (PoE)
Power Quality Meter
Power Substation Control
Private Branch Exchange (PBX)
Programmable Logic Controller
RFID Reader
Refrigerator
Signal or Waveform Generator
Software Defined Radio (SDR)
Washing Machine: High-End and Low-End
X-ray: Baggage Scanner, Medical, and Dental

Shipping Cost

We only ship to the United States. Shipping costs are calculated based on the total order amount.

Shipping Method And Delivery Time

All orders will be processed and shipped within 72 hours of placing the order (excluding weekends and holidays). They will ship from Shenzhen, China, primarily via 4PX logistics. Depending on the destination and logistics conditions, other carriers such as DHL, FedEx, UPS, USPS, etc., may also handle the delivery. Estimated shipping time is 7-12 business days, with actual delivery occurring in 10-17 business days, depending on logistics conditions.