Texas Instruments TL2575-33IKV

Overview

TL2575-33IKV from Texas Instruments is a fixed-output 3.3-V, 1-A step-down (buck) switching voltage regulator in TO-220 staggered-leads package. It delivers ±5% output regulation over line, load, and temperature, operates from 4.75 V to 40 V input, integrates a 52-kHz oscillator and cycle-by-cycle current limiting, and is used in industrial power supplies requiring compact, efficient DC/DC conversion.

For engineers reviewing the TL2575-33IKV datasheet, TL2575-33IKV pinout, TL2575-33IKV application, or TL2575-33IKV equivalent, key selection considerations include its 3.3-V fixed output, 1-A continuous load capability, ON/OFF shutdown control, thermal shutdown protection, and compatibility with standard off-the-shelf inductors and Schottky diodes in minimal-component buck designs.

Technical Context

The TL2575-33IKV implements a monolithic synchronous-buck topology with an integrated 1-A N-channel MOSFET switch, internal 1.23-V band-gap reference, fixed-gain error amplifier, and 52-kHz oscillator. Its feedback loop uses direct connection of the FEEDBACK pin to OUTPUT for fixed-voltage operation, eliminating external resistors.

It supports manual shutdown via TTL-compatible ON/OFF pin (≤1.6 V for enable, ≥2.2 V for standby), draws only 50 μA typical quiescent current in shutdown, and includes cycle-by-cycle current limiting, thermal shutdown, and internal frequency compensation - enabling stable operation with just four external components: input capacitor, output capacitor, inductor, and catch diode.

Key Specifications

Pinout & Package

TL2575-33IKV is housed in a TO-220 staggered-leads (KV) package with 5 pins, featuring exposed metal tab for thermal conduction to heatsink or PCB copper pour. Pin 1 (VIN) accepts unregulated DC input; Pin 2 (OUTPUT) delivers regulated 3.3 V; Pin 3 (GND) is power ground; Pin 4 (FEEDBACK) is internally connected to output for fixed-voltage operation; Pin 5 (ON/OFF) controls enable/disable via TTL-level signal.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Compared with LM2575-3.3, TL2575-33IKV offers identical performance but broader manufacturer support and updated qualification; versus MP1584EN-LF-Z, it trades higher integration and robust protection for lower switching frequency and fixed-output inflexibility - making it preferable for cost-sensitive, thermally demanding, or EMI-controlled industrial power rails.

Availability

TL2575-33IKV is available at Aetrix Electronics and suitable for industrial motor drives, factory automation PLCs, grid infrastructure meters, and building automation sensors requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TL2575-33IKV 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 technologies, with decades of expertise in high-reliability power conversion ICs.

The TL2575 family was designed as a drop-in upgrade to linear regulators in industrial and automotive power supplies - delivering high efficiency, integrated protection, and minimal external component count for ruggedized buck conversion.

FAQ

What is the maximum input voltage rating for TL2575-33IKV?

The TL2575-33IKV has an absolute maximum input voltage of 42 V and a recommended operating range of 4.75 V to 40 V. Exceeding 40 V continuously may trigger overvoltage stress or reduce lifetime reliability. The related TL2575HV-33IKV variant supports up to 60 V input, but TL2575-33IKV itself is strictly rated for ≤40 V operation per TI SLVS638D datasheet Section 6.1 and 6.3.

Does TL2575-33IKV require external feedback resistors?

No, TL2575-33IKV does not require external feedback resistors. As a fixed-output variant, its internal feedback node (FEEDBACK pin) is pre-configured for 3.3 V regulation; the pin must be connected directly to the OUTPUT pin per the functional diagram and pin table in the datasheet. External resistors are only needed for the adjustable TL2575-ADJ version.

How is thermal performance managed in TL2575-33IKV?

TL2575-33IKV uses a TO-220 (KV) package with RθJA = 26.5°C/W and incorporates thermal shutdown that activates at TJ ≈ 150°C. Effective thermal management requires mounting the exposed tab to a heatsink or large copper pour; derating is recommended above 85°C ambient. The device also reduces switching frequency under overload to limit average power dissipation, as documented in Section 6.5 footnote (1).

Can TL2575-33IKV be used in inverting buck-boost configurations?

Yes, TL2575-33IKV can be configured as an inverting buck-boost regulator per TI Application Report SLVA019B, though this requires repositioning the inductor and diode and results in negative output voltage. The datasheet explicitly lists "inverting buck-boost power supplies" in Section 2 Applications, and the internal switch architecture supports this topology - however, output regulation accuracy and transient response differ from standard buck mode.

What is the purpose of the ON/OFF pin on TL2575-33IKV?

The ON/OFF pin (Pin 5) provides TTL-compatible shutdown control: pulling it low (≤1.6 V) enables regulation, while pulling it high (≥2.2 V) places TL2575-33IKV into standby mode with 50 μA typical quiescent current. This pin supports system-level power sequencing, battery-saving sleep states, and fault-initiated disable - and must never be left floating, per Section 8.3.2 of the datasheet.