Texas Instruments LMS1587CSX-3.3/NOPB

Overview

LMS1587CSX-3.3/NOPB from Texas Instruments is a 3A, 3.3V fixed-output low-dropout linear regulator in DDPAK/TO-263 (KTT) package, featuring 1.2V typical dropout at 3A, fast transient response, and integrated thermal shutdown and current limiting. It delivers stable power to microprocessor core supplies requiring tight regulation and low noise.

For engineers reviewing the LMS1587CSX-3.3/NOPB datasheet, LMS1587CSX-3.3/NOPB pinout, LMS1587CSX-3.3/NOPB application, or LMS1587CSX-3.3/NOPB equivalent, key selection criteria include dropout voltage at full load, thermal resistance (0.65°C/W junction-to-case), ripple rejection (72 dB at 120 Hz), output accuracy (±1.0% over temperature), and compatibility with 10 µF minimum output capacitance.

Technical Context

The LMS1587CSX-3.3/NOPB uses an internal zener-trimmed bandgap reference and NPN pass transistor architecture optimized for low dropout and high PSRR. Its control loop is designed for stability with ≥10 µF tantalum or ceramic output capacitors, and it incorporates foldback current limiting that reduces output current during overload conditions.

Operating across 0°C to 125°C ambient, the device maintains ±0.05% load regulation and ±0.005% line regulation while delivering up to 3A continuous output current. The integrated thermal shutdown activates at ~150°C junction temperature, and the 2000V HBM ESD rating supports robust handling in production environments.

Key Specifications

Pinout & Package

Package: DDPAK/TO-263 (KTT), 3-pin surface-mount with exposed thermal pad. Requires soldering to ≥4 cm² copper pour with ≥4 thermal vias for rated 3A performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and LM1086CT-3.3, the LMS1587CSX-3.3/NOPB uniquely combines 3A output, TO-263 thermal performance, and 1.3V dropout - making it irreplaceable for compact, high-current 3.3V regulation where board space and thermal headroom are constrained.

Availability

LMS1587CSX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLC modules, medical sensor electronics, FPGA-based test equipment, and embedded computing platforms requiring stable component supply with long-term manufacturability.

Supply support for LMS1587CSX-3.3/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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The LMS1587CSX-3.3/NOPB belongs to TI's legacy LDO regulator family engineered for high-current, low-dropout operation in microprocessor and FPGA power systems - emphasizing thermal robustness, transient performance, and industrial-grade reliability.

FAQ

What is the minimum input voltage required for LMS1587CSX-3.3/NOPB to maintain regulation?

The LMS1587CSX-3.3/NOPB requires VIN ≥ 4.6V to sustain 3.3V output at 3A load, based on its 1.3V maximum dropout voltage. Below this threshold, output voltage drops linearly with input. Operation is specified down to 4.75V input to guarantee full 3.3V ±1% accuracy across temperature and load.

Can LMS1587CSX-3.3/NOPB be used with ceramic output capacitors?

Yes, the LMS1587CSX-3.3/NOPB is stable with ceramic output capacitors ≥10 µF, provided they meet the manufacturer's ESR requirements (typically 5–50 mΩ). Unlike older LDOs, its internal compensation does not require high-ESR tantalum capacitors - enabling smaller footprint and lower cost designs.

What thermal management is required for LMS1587CSX-3.3/NOPB at full 3A load?

At 3A and 4.75V input, LMS1587CSX-3.3/NOPB dissipates ~3.4W. With 0.65°C/W junction-to-case resistance, a 20°C/W board-level thermal path (via ≥4 vias to 4 cm² copper) keeps junction temperature <100°C at 60°C ambient - well below the 150°C shutdown threshold.

Does LMS1587CSX-3.3/NOPB include reverse-voltage or reverse-current protection?

No, the LMS1587CSX-3.3/NOPB lacks built-in reverse-voltage or reverse-current protection. If the output voltage exceeds the input (e.g., during hot-swap or backup battery scenarios), current flows backward through the pass transistor, potentially damaging upstream circuitry. An external blocking diode or ideal diode controller is required for such use cases.

Is LMS1587CSX-3.3/NOPB RoHS compliant?

LMS1587CSX-3.3/NOPB carries "RoHS Exempt" status per TI's packaging documentation, meaning it complies with RoHS Directive 2011/65/EU but contains lead in the die attach or bond wires - permitted under exemption 7a for high-melting-temperature solder. Full compliance documentation is available in TI's official RoHS statement.