# Step-Down Adjustable Regulator Texas Instruments LM2678S-ADJ, Input 8–40 V, Output 1.2–37 V, Package TO-263-7

**URL:** https://aio.lv/en/product--texas-instruments-lm2678s-adjnopb--12224459
**Data updated:** 2026-03-29 16:11 (EEST)
**Category:** Electronics Accessories
**Manufacturer:** texas instruments
**Manufacturer code:** LM2678S-ADJ/NOPB
**EAN:** 2050009608002
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 22.99 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 19.00 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--texas-instruments-lm2678s-adjnopb--12224459

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

The Texas Instruments LM2678S-ADJ is an adjustable step-down (buck) switching regulator in a TO-263-7 package. Specified for input voltages from 8 to 40 V and adjustable output from 1.2 to 37 V, it provides DC-DC conversion for power-supply designs. Suitable for embedded systems, industrial electronics, and prototyping where a wide input range and adjustable regulated output are required.

## Long description

The Texas Instruments LM2678S-ADJ is an adjustable step-down (buck) switching regulator in a TO-263-7 package designed for DC-DC conversion in power-supply designs. It accepts input voltages from 8 to 40 V and provides an adjustable output range from 1.2 to 37 V, enabling flexible voltage regulation for a variety of electronic systems. The component is intended for use where a wide input range and a configurable regulated output are required, and its TO-263-7 package supports thermal performance appropriate for board-mounted power modules.
Advantages
The LM2678S-ADJ offers a wide input voltage range and a broad adjustable output span, reducing the need for multiple regulator variants in designs. Its switching regulator topology improves efficiency compared with linear regulators when stepping down higher input voltages. The TO-263-7 package provides a compact footprint with thermal conduction suitable for moderate power dissipation on standard PCBs. The device is compatible with common external components used in buck converter topologies, making it straightforward to integrate into existing power-supply layouts.
Suitable for
 Embedded systems requiring adjustable regulated DC supply
 Industrial electronics with wide input voltage sources
 Prototyping and development of power-supply modules
 Battery-powered or vehicle electrical systems with higher input voltages
 Custom electronics where a single regulator must cover multiple output rails
Key specifications
 Topology: Step-down (buck) switching regulator
 Input voltage range: 8–40 V
 Adjustable output voltage range: 1.2–37 V
 Package type: TO-263-7 (surface-mount power package)
 Adjustable output via external feedback network
 Intended for board-mounted applications with external inductor and capacitors
How to use
Integrate the LM2678S-ADJ into a buck converter circuit following the manufacturer’s recommended application schematic: connect the input supply to the input pin with suitable input decoupling, place the switching inductor, diode (or synchronous arrangement if applicable), and output capacitors according to layout guidance to minimize EMI and voltage ripple. Set the desired output voltage using an external resistor divider between the output and feedback pin, referencing the device’s feedback voltage specification to calculate resistor values. Ensure adequate copper area or a thermal pad under the package to aid heat dissipation for higher load currents.
Usage recommendations
For reliable operation, use low-ESR output capacitors, a properly rated inductor for the expected current, and follow layout recommendations to keep the switching loop area small. Verify thermal performance under worst-case input voltage and load conditions and add heat sinking or improved PCB thermal vias if required.

## FAQ

### How much does the Texas Instruments LM2678S-ADJ Step-Down Adjustable Regulator cost, and is it available for purchase?

The price is 22.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 23.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All texas instruments products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized texas instruments service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

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