LM2596S-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2596S-ADJ is a monolithic integrated circuit step-down switching voltage regulator from the SIMPLE SWITCHER series, manufactured by UMW. It operates at a fixed 150 kHz switching frequency and provides an adjustable output voltage range of 1.2 V to 37 V with a maximum output current of 3 A. The device accepts an input voltage range of 4.5 V to 40 V. It utilizes a TO-263-5 surface-mount package and supports an operating temperature range from -40 °C to +125 °C. The regulator includes internal frequency compensation and a fixed-frequency oscillator.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated SIMPLE SWITCHER power converter topology for simplified design
• Fixed 150 kHz internal oscillator reduces external filter component size
• Internal frequency compensation minimizes required external components
• Built-in thermal shutdown and current limiting protection mechanisms

Voltage Regulators - DC DC Switching Regulators Applications

• Battery-powered equipment power conversion
• Distributed bias supplies in electronic systems
• Pre-regulator stages for linear post-regulators
• Efficient step-down DC-DC conversion for consumer electronics

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific batch corresponds to UMW manufacturing origin, as the LM2596 family is widely produced by multiple vendors including Texas Instruments and National Semiconductor. Confirm the suffix 'ADJ' indicates the adjustable output variant rather than fixed voltage versions. Ensure the TO-263-5 package marking aligns with UMW's standard identification codes to prevent counterfeit substitution.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when an adjustable buck converter is required with up to 3 A load capacity. The TO-263-5 package is suitable for applications requiring moderate thermal dissipation in surface-mount layouts. Designers must calculate appropriate external feedback resistors to set the desired output voltage within the 1.2 V to 37 V range while ensuring the inductor current rating exceeds the peak switch current.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2596 series of SIMPLE SWITCHER regulators, which also includes fixed-output variants (3.3V, 5V, 12V) and other current ratings like the LM2599. The 'S' designation specifically denotes the TO-263 surface-mount package, distinguishing it from the through-hole TO-220 version. The ADJ suffix confirms the adjustable output configuration controlled by external resistive dividers.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2596S-ADJ/NOPB (Texas Instruments)

Voltage Regulators - DC DC Switching Regulators FAQ

How is the output voltage adjusted?

The output voltage is set using an external resistor divider network connected to the Feedback pin, typically calculated using the formula Vout = 1.23V * (1 + R2/R1).

What is the typical standby current?

The typical quiescent current in shutdown mode is approximately 80 µA.