Texas Instruments LM2575T-5.0/NOPB

Overview

LM2575T-5.0/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-220 package, delivering a fixed 5.0V ±4% output across 8–40V input range with 77% efficiency at 12V_IN/1A_OUT, 52 kHz fixed-frequency operation, and integrated thermal shutdown/current limiting. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion.

For engineers reviewing the LM2575T-5.0/NOPB datasheet, LM2575T-5.0/NOPB pinout, LM2575T-5.0/NOPB application, or LM2575T-5.0/NOPB equivalent, key selection considerations include its 1A continuous output capability, 52 kHz oscillator frequency for predictable EMI filtering, TTL-compatible shutdown control with 50 μA standby current, and compatibility with standard off-the-shelf inductors and Schottky catch diodes.

Technical Context

The LM2575T-5.0/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single TO-220 device. Its 52 kHz fixed-frequency oscillator enables stable loop response without external timing components, while cycle-by-cycle current limiting and thermal shutdown provide fault protection during overload or short-circuit conditions.

It operates in continuous conduction mode with a maximum duty cycle of 98%, supporting input voltages up to 40V and delivering regulated 5.0V output with ±4% tolerance over line (8–40V), load (0.2–1A), and temperature (−40°C to +125°C) variations. The feedback node is internally set to 5.0V - no external resistors required.

Key Specifications

Pinout & Package

LM2575T-5.0/NOPB uses a 5-lead TO-220 package (package code NDH0005D) with exposed tab electrically connected to Pin 2 (Output). Mounting requires thermal interface to heatsink or PCB copper pour for >0.5A continuous operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM2575HVT-5.0/NOPB, the LM2575T-5.0/NOPB offers lower cost and identical functionality for 40V-input systems; versus MP1584EN-LF-Z, it trades higher current and frequency for simpler design, proven reliability, and no external feedback network.

Availability

LM2575T-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, test equipment front-ends, and LED driver pre-regulators requiring stable component supply and long-term manufacturability.

Supply support for LM2575T-5.0/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in switching regulator design and manufacturing.

The LM2575 series belongs to TI's SIMPLE SWITCHER® portfolio, engineered for ease-of-use in cost-sensitive, medium-power DC-DC applications where reliability, minimal external components, and thermal robustness are prioritized over ultra-high efficiency or miniaturization.

FAQ

What is the maximum input voltage rating for LM2575T-5.0/NOPB?

The LM2575T-5.0/NOPB has an absolute maximum input voltage rating of 45V, but its specified operating input voltage range is 8V to 40V. Operation above 40V risks exceeding electrical specifications and may trigger internal protection circuits. For designs requiring >40V input, the LM2575HVT-5.0/NOPB variant (60V max) is recommended. Always observe derating guidelines per TI's SNVS106E datasheet.

Does LM2575T-5.0/NOPB require external feedback resistors to set the output voltage?

No - the LM2575T-5.0/NOPB is a fixed-output version with internal feedback network calibrated for 5.0V ±4%. Pin 4 (Feedback) is not externally accessible and is internally tied to the output. This eliminates resistor selection, placement, and tolerance errors, simplifying design and improving long-term stability compared to adjustable variants like LM2575-ADJ.

Can LM2575T-5.0/NOPB be used in thermally constrained environments without a heatsink?

Yes, for moderate loads: at 12V_IN/0.5A_OUT, power dissipation is ~0.7W, and with 4 in² PCB copper area, θ_JA drops to ~45°C/W - resulting in ~32°C rise above ambient. However, at full 1A load with 24V_IN, dissipation exceeds 2W; a heatsink or substantial copper pour is required to maintain junction temperature below 125°C. Thermal performance must be validated per layout and ambient conditions.

What type of catch diode is recommended for LM2575T-5.0/NOPB?

A Schottky diode rated for ≥1.2× output current (≥1.2A) and ≥1.25× max input voltage (≥50V for 40V_IN) is recommended. TI specifies the SR103 (3A, 30V) or 1N5818 (1A, 30V) for 5V output designs. Low forward voltage (<0.5V) minimizes conduction loss, and fast recovery prevents reverse recovery spikes that degrade efficiency and EMI.

How does the ON/OFF pin function on LM2575T-5.0/NOPB?

The ON/OFF pin (Pin 5) provides TTL-compatible enable control: driving it ≤0.8V (max) enables regulation; driving it ≥2.2V (min) places LM2575T-5.0/NOPB in low-power standby with 50 µA typical quiescent current. The pin draws ≤30 µA in either state, allowing direct interfacing with microcontrollers or logic gates without level-shifting. Internal pull-down ensures default ON if left floating.