Texas Instruments LM2575HVT-12

Overview

LM2575HVT-12 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-220 package, delivering a fixed 12V output with ±4% tolerance over 15–60V input range, 88% efficiency at 15V_IN/1A, 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 LM2575HVT-12 datasheet, LM2575HVT-12 pinout, LM2575HVT-12 application, or LM2575HVT-12 equivalent, this page delivers verified electrical specs, TO-220 terminal mapping, real-world use cases, and two validated alternative parts for design flexibility and supply continuity.

Technical Context

The LM2575HVT-12 integrates a 52 kHz fixed-frequency oscillator, N-channel DMOS output switch, internal current limit (1.7–3.2 A peak), and feedback comparator with 1.23 V reference. Its architecture uses external diode-inductor-capacitor energy transfer to achieve buck regulation without requiring external compensation.

It operates across −40°C to +125°C junction temperature, supports TTL-compatible shutdown (50 μA standby), and features cycle-by-cycle current limiting plus thermal shutdown-enabling robust operation in unregulated input environments like automotive battery rails or industrial 48V systems.

Key Specifications

Pinout & Package

LM2575HVT-12 is housed in a 5-lead TO-220 package (Package Number NDH0005D) with exposed tab electrically connected to Pin 2 (Output). Mounting requires isolation if output ground differs from heatsink potential.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2575T-12, the LM2575HVT-12 adds 20 V input headroom critical for transient resilience; versus LM2596T-12, it trades higher current and frequency for proven TO-220 thermal performance and simpler external component selection.

Availability

LM2575HVT-12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, programmable logic controllers, and test equipment requiring stable component supply with long-term manufacturability.

Supply support for LM2575HVT-12 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 reliable, high-volume power conversion solutions.

The LM2575HVT-12 belongs to TI's SIMPLE SWITCHER® family-designed specifically for engineers needing easy-to-use, highly integrated buck regulators that minimize external components while maintaining industrial-grade reliability and thermal robustness.

FAQ

What is the absolute maximum input voltage rating for the LM2575HVT-12?

The LM2575HVT-12 has an absolute maximum input voltage of 63 V, with recommended operating range up to 60 V. Exceeding 63 V risks permanent damage. This 60 V operating limit distinguishes it from the standard LM2575T-12 (40 V max), making LM2575HVT-12 suitable for 48 V systems with load-dump transients. Always include input clamping or TVS protection if transient voltages may approach this limit.

Can the LM2575HVT-12 be used in adjustable-output configurations?

No-the LM2575HVT-12 is a fixed-output variant with internal resistor divider setting 12 V; its Feedback (Pin 4) is not intended for external programming. For adjustable operation, use LM2575HVT-ADJ instead, which provides access to the 1.23 V reference and requires external R1/R2 resistors. Attempting to modify LM2575HVT-12's output will not yield stable regulation and violates its specified operating conditions.

What thermal derating applies to the LM2575HVT-12 in a TO-220 package without a heatsink?

In free-air (no heatsink, minimal copper), the LM2575HVT-12's θ_JA is 65 °C/W. At 1 A output and 25 V input, power dissipation is ~13 W, causing >845 °C rise-far exceeding 125 °C max junction temperature. Therefore, a heatsink or ≥4 in² PCB copper area (reducing θ_JA to 45 °C/W) is mandatory for full-load operation. Derate output current linearly above ambient temperatures where (T_JMAX − T_A) / θ_JA < P_D.

Which catch diode is recommended for the LM2575HVT-12 in a typical 24V-to-12V design?

Texas Instruments recommends a Schottky diode such as MBR340 (40 V, 3 A) or SR104 (40 V, 1 A) for LM2575HVT-12. The diode must withstand ≥1.25 × VIN_MAX = 30 V reverse voltage and carry ≥1.2 × I_LOAD = 1.2 A average current. Schottky types minimize forward drop and switching losses-critical for maintaining the LM2575HVT-12's 88% efficiency. Avoid standard PN diodes due to excessive recovery losses.

Does the LM2575HVT-12 require external compensation components?

No-the LM2575HVT-12 includes fully internal frequency compensation optimized for standard 52 kHz operation with typical external components (e.g., 330 μH inductor, 330 μF output capacitor). Adding external compensation capacitors or resistors is unnecessary and may destabilize regulation. TI's design procedure (SNVS106E) confirms stable loop behavior using only the four required external parts: input cap, output cap, inductor, and catch diode.