DC/DC Switching Regulator Texas Instruments LM2574HVN-ADJ/NOPB – Adjustable High-Voltage PMIC in PDIP-8

The Texas Instruments LM2574HVN-ADJ/NOPB is an adjustable high-voltage DC/DC step-down switching regulator supplied in a PDIP-8 package. Designed for compact through-hole implementations, this regulator provides an adjustable output voltage using an external feedback network and is suitable for board-level power supplies and battery-powered applications. The device integrates the switch, oscillator, and control circuitry to enable efficient regulation and simplified external component selection for standard buck converter topologies.

Advantages

The LM2574HVN-ADJ/NOPB offers a high input-voltage capability and an adjustable output, allowing flexible voltage selection with minimal external components. Its PDIP-8 package supports easy prototyping and retrofit into existing through-hole designs. The integrated switch and control reduce component count and board area compared with discrete solutions, while the regulator's switching architecture improves conversion efficiency for many step-down applications.

Suitable for

• Board-level regulated power supplies
• Battery-powered devices and portable equipment
• Industrial control and instrumentation electronics
• Repair, prototyping, and educational electronics projects

Key specifications

• Function: Adjustable step-down (buck) switching regulator
• Package: Through-hole PDIP-8
• Adjustable output voltage via external resistor divider
• Integrated switching transistor and control circuitry
• Intended for high input-voltage applications (HV variant)
• Typical use: single-output regulated power conversion

How to use

Install the regulator in a PDIP-8 footprint on the PCB or a prototyping board, and connect the input and output with appropriate decoupling and an external inductor, diode and capacitors to form a buck converter according to standard application topology. Select the feedback resistor values to set the desired output voltage, following the manufacturer's recommended resistor ratio and layout guidance. Ensure proper heatsinking consideration and component placement to manage thermal dissipation during operation.

Recommendations

Follow Texas Instruments' application notes for recommended external components, PCB layout, and thermal considerations. Use low ESR output capacitors and a suitable Schottky diode for improved efficiency. Keep input and output traces short and place the feedback network close to the device pins to maintain regulation accuracy.