Texas Instruments LM2593HVSX-5.0/NOPB

Overview

LM2593HVSX-5.0/NOPB from Texas Instruments is a monolithic 150-kHz non-synchronous step-down DC-DC converter in TO-263-7 package, delivering up to 2 A output current with ±4% output voltage accuracy at 5.0 V, supporting input voltages up to 60 V, and featuring integrated shutdown/soft-start and out-of-regulation error flag for industrial power supply rails.

For engineers reviewing the LM2593HVSX-5.0/NOPB datasheet, LM2593HVSX-5.0/NOPB pinout, LM2593HVSX-5.0/NOPB application, or LM2593HVSX-5.0/NOPB equivalent, key selection criteria include its fixed 5-V output, 2-A load capability, 60-V max input, thermal shutdown protection, and programmable power-good delay - all critical for high-reliability off-line and battery-fed buck regulators.

Technical Context

The LM2593HVSX-5.0/NOPB implements a fixed-frequency (150 kHz) current-mode PWM control architecture with internal compensation, enabling stable operation with minimal external components. Its integrated 2-A N-channel DMOS switch, ±4% output tolerance over line/load/temperature, and dedicated Flag/Delay pins support precise power sequencing and fault monitoring in isolated systems.

It operates in continuous conduction mode across 4.5–60 V input range, uses internal soft-start via SD/SS pin capacitor charging (5 µA source), and provides regulated 5.0 V output without external feedback resistors - distinguishing it from adjustable variants requiring R1/R2 dividers.

Key Specifications

Pinout & Package

LM2593HVSX-5.0/NOPB is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad (10.10 mm × 8.89 mm body size), optimized for high-power dissipation on PCB copper areas.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2593HVSX-5.0/NOPB, the TO-220 variant trades thermal performance for mechanical mounting flexibility, while LM2678-5.0/NOPB offers higher current and frequency at the cost of increased external component count and layout complexity.

Availability

LM2593HVSX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, telecom remote radio units, and test equipment auxiliary rails requiring stable component supply with long lifecycle assurance.

Supply support for LM2593HVSX-5.0/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, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion solutions.

The LM2593HV product line was designed for rugged, low-component-count step-down regulation in harsh environments - targeting industrial automation, transportation, and telecom infrastructure where input voltage extremes and thermal stress are common.

FAQ

What is the maximum input voltage supported by LM2593HVSX-5.0/NOPB?

The LM2593HVSX-5.0/NOPB supports a maximum input voltage of 60 V, with absolute maximum rating at 63 V. This enables use in 48-V industrial systems, automotive applications with load-dump transients, and telecom power distribution. Operation above 40 V requires attention to Flag pin voltage limits - a resistive divider is mandatory if pulling Flag high to rails exceeding 45 V. The device maintains regulation down to 4.5 V input.

Does LM2593HVSX-5.0/NOPB require external feedback resistors?

No, LM2593HVSX-5.0/NOPB does not require external feedback resistors. As a fixed 5.0-V output variant, the feedback pin (Pin 6) is internally connected to the output, eliminating external resistor networks. This simplifies layout, improves long-term output stability, and removes resistor tolerance and temperature drift as error sources - unlike the adjustable LM2593HV versions which require precision R1/R2 dividers.

How does the Flag and Delay functionality work on LM2593HVSX-5.0/NOPB?

The Flag pin (Pin 3) is an open-collector output that goes low (≤1 V) when the 5.0-V output falls below 95% of nominal (i.e., <4.75 V), sinking up to 3 mA. The Delay pin (Pin 5) sets the power-good assertion delay: an internal 3 µA current charges an external capacitor until it reaches 1.3 V, at which point Flag is pulled high (via external pull-up). This prevents premature system enablement during output settling.

What thermal performance can be expected from LM2593HVSX-5.0/NOPB in TO-263 package?

In the TO-263-7 (KTW) package, LM2593HVSX-5.0/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 20°C/W when mounted on a double-sided PCB with 3 in² copper on the component side and ~16 in² on the opposite side. With proper thermal pad soldering and copper area, it sustains 2 A continuous output at ambient temperatures up to 85°C without external heatsink - verified per TI's SPRA953 thermal metrics methodology.

Is LM2593HVSX-5.0/NOPB pin-compatible with other LM2593HV variants?

Yes, LM2593HVSX-5.0/NOPB shares identical 7-pin TO-263 pinout and function mapping with all LM2593HV family members (e.g., LM2593HVSX-3.3/NOPB, LM2593HVSX-ADJ/NOPB), including VIN, Output, Flag, Ground, Delay, Feedback, and SD/SS. However, the Feedback pin connection differs electrically: fixed versions tie it internally to output, while adjustable versions require external resistor networks - so PCB layout is compatible, but schematic design must match the variant's internal topology.