onsemi LM2576TV-ADJG

Overview

LM2576TV-ADJG from onsemi is a monolithic 3.0 A, 52 kHz step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), ±4% output voltage tolerance, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 7.0 V to 40 V input and delivers high efficiency-up to 77% at 3.0 A-enabling compact, heatsink-free power supplies in industrial control and embedded systems.

For engineers reviewing the LM2576TV-ADJG datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-220-5 (Case 314B) package with heatsink-connected ground pin, 80 µA standby current under TTL shutdown, fixed 52 kHz oscillator, and requirement for only four external components (inductor, diode, input/output capacitors).

Technical Context

The LM2576TV-ADJG implements a voltage-mode controlled buck topology with an internal 1.23 V bandgap reference, error amplifier, 52 kHz oscillator, and NPN power switch. Its feedback pin directly interfaces with an external resistor divider to set output voltage, enabling precise regulation across line and load variations.

Protection architecture includes cycle-by-cycle peak current limiting (typ. 5.8 A at 25 °C), thermal shutdown at ~150 °C junction temperature, and TTL-compatible ON/OFF control with 1.4 V threshold. The device uses a fixed-frequency PWM scheme-not current-mode-so loop stability relies on output capacitor ESR and inductor value selection per design guidelines.

Key Specifications

Pinout & Package

LM2576TV-ADJG is housed in a TO-220-5 package (Case 314B), with the metal tab (heatsink surface) internally connected to Pin 3 (GND). This configuration requires mechanical mounting to a heatsink or copper pour for thermal management above ~1.5 A continuous load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2576TV-ADJG, LM2596S-ADJ offers higher frequency and tighter reference tolerance but reduced robustness in overload conditions, while MP1584EN-LF-Z provides superior dynamic response at the cost of added design complexity and missing integrated thermal latch behavior.

Availability

LM2576TV-ADJG is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and battery charger front-ends requiring stable component supply with long-term lifecycle support.

Supply support for LM2576TV-ADJG 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

onsemi is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The LM2576 series was designed as a rugged, easy-to-use buck regulator family targeting cost-sensitive, high-reliability power conversion in industrial controls and legacy embedded systems where simplicity and thermal resilience are critical.

FAQ

What is the maximum input voltage rating for LM2576TV-ADJG?

The LM2576TV-ADJG has an absolute maximum input voltage rating of 45 V, but its recommended operating input voltage range is 7.0 V to 40 V DC. Exceeding 40 V may degrade long-term reliability or trigger overvoltage stress, especially at elevated temperatures. The device's internal switch saturation voltage and current limit are characterized within this 40 V limit, making it suitable for 24 V and 36 V industrial bus applications with margin for transients.

Can LM2576TV-ADJG be used without a heatsink?

LM2576TV-ADJG can operate without an external heatsink at ≤1.5 A output current and ambient temperatures ≤50 °C, assuming adequate PCB copper (≥2 in² 2-oz copper connected to Pin 3). At full 3.0 A load or higher ambient, thermal resistance (R_JA = 65 °C/W) necessitates a heatsink or large thermal pad to maintain junction temperature below 125 °C. The TO-220 tab is electrically GND, so insulation is required if mounting to a chassis.

What external components are mandatory for LM2576TV-ADJG operation?

Four mandatory external components are required: (1) input capacitor (100 µF, ≥75 V aluminum electrolytic), (2) output capacitor (680–2000 µF, ≥25 V), (3) Schottky catch diode (e.g., MBR360, ≥3 A, ≥40 V), and (4) power inductor (e.g., 100 µH, ≥3.5 A saturation current). The feedback resistors (R1/R2) are also mandatory for the adjustable version to set output voltage-R1 typically 1.0–5.0 kΩ, R2 calculated per V_OUT = 1.23 × (1 + R2/R1).

How does the ON/OFF pin function on LM2576TV-ADJG?

The ON/OFF pin (Pin 5) enables TTL-compatible shutdown: applying ≥2.2 V disables the regulator, reducing total input current to ~80 µA; applying ≤1.0 V or leaving the pin open enables normal operation. The pin draws <30 µA in either state and has no pull-up/down-external logic or microcontroller GPIO can directly drive it. This feature supports system-level power sequencing and low-power sleep modes without auxiliary circuitry.

Is LM2576TV-ADJG still in active production?

Yes, LM2576TV-ADJG remains in active production per onsemi's official product status and distributor inventory (Digi-Key, Mouser). Although some fixed-output variants have been discontinued, the adjustable TO-220 version (TV suffix) is explicitly listed as active in onsemi's latest ordering information and is supported with full datasheet documentation through April 2025 Rev. 11.