LM2574N-ADJ NOPB Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments LM2574N-ADJ is a simple step-down switching regulator with adjustable output voltage and 500 mA output current capability. It operates from 4 V to 40 V input with internal 52 kHz oscillator in a DIP-8 through-hole package. Available from stock worldwide for cost-effective non-isolated DC-DC conversion designs.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LM2574N-ADJ NOPB Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM2574N-ADJ NOPB?
- Adjustable output voltage from 1.23 V to 37 V set by external resistor divider, covering a wide range of regulated rail requirements
- 500 mA guaranteed output current with internal 52 kHz switching frequency requiring only a small 220 µH external inductor
- Wide 4 V to 40 V input voltage range accepting industrial 24 V and automotive 12 V unregulated bus voltages
- DIP-8 through-hole package enabling breadboard prototyping and easy hand soldering for low-volume and repair applications
What is LM2574N-ADJ NOPB used for?
The LM2574N-ADJ is used in simple non-isolated step-down power supplies where a 4 V to 40 V unregulated input must be converted to a stable adjustable output up to 500 mA for microcontroller and analog circuit powering. It suits industrial equipment, test bench power supplies, and hobby electronics requiring a robust switching regulator without complex external circuitry. The device also provides regulated voltage in automotive accessories and battery-powered systems where input voltage varies significantly during operation.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the LM2574N-ADJ NOPB datasheet?
LM2574N-ADJ NOPB Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM2574N-ADJ NOPB?
Compatible alternatives and drop-in replacements for LM2574N-ADJ NOPB:
Frequently Asked Questions
What external components are required to build a complete LM2574N-ADJ step-down converter at 500 mA?
A minimum LM2574N-ADJ design requires a 220 µH inductor rated at 600 mA, a 100 µF electrolytic output capacitor, a Schottky catch diode rated at 1 A and 40 V (such as 1N5819), and two resistors to set output voltage via the feedback divider. Input bypass capacitor of 47 µF is also recommended. The total external component count is fewer than 6 parts, making it one of the simplest switching regulator designs available.
How is the output voltage of LM2574N-ADJ set and what resistor values are needed for a 5 V regulated output from 12 V input?
Output voltage is set by a resistor divider from output to feedback pin referenced to 1.23 V internal reference. For 5 V output, using R1 from output to feedback as 1 kΩ, R2 from feedback to ground equals R1 x (Vout/Vref - 1) = 1 kΩ x (5/1.23 - 1) = 3.06 kΩ, using standard 3.09 kΩ (E96 series). Output accuracy is within ±4% over line and load variation at 52 kHz switching frequency.
How does LM2574N-ADJ efficiency compare with a linear regulator when stepping down from 24 V to 5 V at 500 mA?
A linear regulator dropping 19 V at 500 mA dissipates 9.5 W as heat, requiring a large heatsink. The LM2574N-ADJ switching at 52 kHz achieves approximately 77% efficiency in the same conversion, dissipating under 1.3 W internally. This 8 W reduction in heat generation eliminates the heatsink and allows use in enclosed enclosures where a linear regulator would require forced air cooling or a significantly larger case.
What are the limitations of the 52 kHz switching frequency in LM2574N-ADJ compared with higher-frequency modern buck converters?
The fixed 52 kHz switching frequency requires a relatively large 220 µH inductor and 100 µF output capacitor to achieve acceptable ripple. Modern 500 kHz to 2 MHz buck converters use 10 µH inductors and 10 µF ceramic capacitors, occupying roughly 10x less board space. The LM2574N-ADJ is better suited for through-hole prototyping and low-density boards where the larger 220 µH inductor footprint is acceptable over the tighter layout demands of high-frequency switchers.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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