Texas Instruments TL2575-15IN

Overview

TL2575-15IN from Texas Instruments is a fixed-output 15-V, 1-A step-down (buck) switching voltage regulator in a TO-220 (KV) package. It delivers ±5% output regulation over line, load, and temperature, operates from 18 V to 40 V input, integrates a 1-A power switch and 52-kHz oscillator, and supports TTL shutdown with 50-μA standby current - used in industrial motor drives and factory automation power supplies.

For engineers reviewing the TL2575-15IN datasheet, TL2575-15IN pinout, TL2575-15IN application, or TL2575-15IN equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions for the KV package, confirmed alternatives with functional differences, and supply support for long-lifecycle embedded power designs.

Technical Context

The TL2575-15IN implements a fixed-frequency (52 kHz typical), cycle-by-cycle current-limited buck topology with internal 1-A N-channel MOSFET switch and integrated error amplifier referenced to a 1.23-V bandgap. Its feedback loop is internally compensated and requires no external compensation components when used in fixed-output configuration.

It features thermal shutdown, overcurrent protection, and a dedicated ON/OFF pin enabling TTL-compatible shutdown with <200 μA standby current. Input voltage range is 18 V to 40 V (min/max for 15-V output), and output regulation holds ±5% across –40°C to +125°C junction temperature with 1-A load.

Key Specifications

Pinout & Package

TL2575-15IN is supplied in the TO-220 (KV) 5-pin staggered-lead package (10.16 mm × 8.82 mm body), with pins 1, 3, 5 electrically connected to the exposed tab (VIN, OUTPUT, GND respectively) and pins 2 and 4 as ON/OFF and FEEDBACK terminals. The tab is electrically tied to VIN and must be isolated from heatsink unless VIN is chassis-ground referenced.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2575HVS-15 and TPS54202DDCR, TL2575-15IN uniquely balances 40-V input robustness, fixed 15-V simplicity, TO-220 thermal reliability, and cost-effective BOM for industrial power rails - making it the preferred choice where input stays within 18–40 V and heatsink-free 1-A operation is required.

Availability

TL2575-15IN is available at Aetrix Electronics and suitable for industrial motor drives, factory automation controllers, and grid infrastructure monitoring units requiring stable component supply across extended product lifecycles.

Supply support for TL2575-15IN 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 experience in industrial-grade power conversion ICs.

The TL2575 family was designed specifically for rugged, low-component-count buck regulation in harsh environments - targeting industrial, automation, and infrastructure applications where reliability, thermal resilience, and wide-input operation are critical.

FAQ

What is the minimum input voltage required for stable 15-V output from TL2575-15IN?

The TL2575-15IN requires a minimum input voltage of 18 V to maintain regulation at full 1-A load, as specified in the Recommended Operating Conditions table. Below 18 V, dropout occurs and output voltage drops linearly with input - this headroom ensures reliable operation under worst-case line and load conditions while preserving 52-kHz switching stability. Always verify input ripple does not dip below 18 V during transients.

Can TL2575-15IN be used in an inverting buck-boost configuration?

Yes, TL2575-15IN can be configured as an inverting buck-boost regulator per TI Application Report SLVA053, though its fixed 15-V feedback architecture requires careful adaptation: the FEEDBACK pin must be reconnected to the inverted output node, and output polarity reverses. However, output current capability drops to ~700 mA due to duty-cycle limitations, and regulation accuracy degrades slightly - confirm with bench validation before deployment.

Does TL2575-15IN require external compensation components?

No, TL2575-15IN uses internal frequency compensation optimized for fixed-output operation with standard 330-µH inductors and 330-µF output capacitors. External compensation is unnecessary and not supported - adding RC networks to the FEEDBACK pin will disrupt regulation and may cause instability or oscillation. Only the recommended four external components (input cap, output cap, inductor, catch diode) are required.

What is the thermal resistance (R_θJA) of TL2575-15IN in the TO-220 package?

The TL2575-15IN in the KV (TO-220) package has a junction-to-ambient thermal resistance (R_θJA) of 26.5°C/W when mounted on a 1-in² 2-oz copper pad with no airflow, per Section 6.4 of the datasheet. This value assumes direct thermal coupling from the exposed tab (VIN-connected) to the heatsink - electrical isolation increases R_θJA by ~10°C/W, so derate accordingly in insulated mounting scenarios.

Is TL2575-15IN RoHS compliant and lead-free?

Yes, TL2575-15IN is RoHS compliant and lead-free, as confirmed in Texas Instruments' official packaging and ordering information (SLVS638D, Section 13.1). The TO-220 (KV) package uses matte tin lead finish, meets JEDEC J-STD-020 moisture sensitivity level 3, and carries TI's standard 10-year product change notification policy for industrial-grade parts.