Texas Instruments LM2591HVSX-5.0/NOPB

Overview

LM2591HVSX-5.0/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous buck DC-DC converter delivering 1-A output current with fixed 5.0-V output, ±4% tolerance over line/load/temperature, 4.5–60-V input range, and 82% typical efficiency at 12-V_IN/1-A. It serves as a primary step-down regulator in industrial power supplies, automotive subsystems, and distributed power architectures requiring high-input-voltage resilience.

For engineers reviewing the LM2591HVSX-5.0/NOPB datasheet, LM2591HVSX-5.0/NOPB pinout, LM2591HVSX-5.0/NOPB application, or LM2591HVSX-5.0/NOPB equivalent, key selection criteria include its 60-V max input rating, ON/OFF control interface, thermal shutdown protection, 90-μA standby current, and DDPAK/TO-263-5 package suitability for high-power-density layouts.

Technical Context

The LM2591HVSX-5.0/NOPB implements a fixed-frequency (150 kHz) current-mode PWM controller with internal power switch, feedback comparator, and oscillator - all integrated into a single chip. Its architecture uses external catch diode, inductor, and input/output capacitors to form a complete buck topology without requiring external compensation components.

It operates in continuous conduction mode (CCM) at full load and transitions to discontinuous conduction mode (DCM) under light loads. Protection features include thermal shutdown, two-stage current limiting (1.3–2.8 A peak), and undervoltage lockout via the ON/OFF pin, enabling robust operation across –40°C to +125°C junction temperature.

Key Specifications

Pinout & Package

LM2591HVSX-5.0/NOPB is packaged in a 5-pin DDPAK/TO-263 surface-mount package (10.18 mm × 8.41 mm body), featuring exposed thermal pad for enhanced heat dissipation and mechanical stability in high-current applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2591SX-5.0/NOPB, LM2591HVSX-5.0/NOPB adds 20-V input headroom critical for automotive and industrial surge immunity; versus LM2678-5.0/NOPB, it trades output current and frequency for simplicity and lower component count in 1-A applications.

Availability

LM2591HVSX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom remote units requiring stable component supply with long-term manufacturability and extended temperature support.

Supply support for LM2591HVSX-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 ICs.

The LM2591HV product line delivers rugged, easy-to-use buck regulators targeting harsh-environment applications where input voltage can exceed 40 V - designed specifically for industrial automation, transportation, and infrastructure equipment.

FAQ

What is the maximum input voltage rating for LM2591HVSX-5.0/NOPB?

The LM2591HVSX-5.0/NOPB has an absolute maximum input voltage rating of 63 V and a recommended operating range of 4.5 V to 60 V. This 60-V upper limit enables direct use with 48-V telecom systems, 36-V industrial buses, and automotive applications subject to load-dump transients per ISO 7637-2. Exceeding 60 V risks permanent damage even if within the 63-V absolute max.

Does LM2591HVSX-5.0/NOPB require external feedback resistors to set the output voltage?

No. The LM2591HVSX-5.0/NOPB is a fixed-output variant with internal resistor divider network configured for 5.0 V. The Feedback pin is internally connected to the output, eliminating the need for external resistors. This simplifies layout, improves accuracy (±4% over temperature), and reduces component count compared to adjustable versions like LM2591HVSX-ADJ.

How does the ON/OFF pin function on LM2591HVSX-5.0/NOPB?

The ON/OFF pin on LM2591HVSX-5.0/NOPB controls device enable/disable state: pulling it to ≥2 V places the IC in shutdown mode with 90 μA typical quiescent current; leaving it floating or pulling it to ≤0.6 V enables normal operation. The threshold is typically 1.3 V, and the pin must not exceed 25 V. This interface supports system-level power sequencing and low-power sleep modes.

What thermal management is required for LM2591HVSX-5.0/NOPB at full 1-A load?

At 1-A output and 12-V input, LM2591HVSX-5.0/NOPB dissipates ~1.2 W. With R_θJA = 50°C/W in the DDPAK package, this yields ~60°C rise above ambient. To maintain <125°C junction temperature, use ≥1-in² internal or external copper pour connected to the exposed thermal pad, avoid enclosing the device, and ensure airflow or ambient ≤65°C. Thermal shutdown activates at 150°C junction.

Can LM2591HVSX-5.0/NOPB be used in a negative-output (inverting) configuration?

Yes - LM2591HVSX-5.0/NOPB supports inverting buck-boost topology to generate negative voltages (e.g., –5 V from +12 V). The circuit bootstraps the ground pin to the negative output and references feedback to ground. Critical constraints include limiting total voltage across +VIN and Ground to ≤60 V (e.g., +20 V input → –12 V output = 32 V stress), using fast Schottky catch diodes, and adding isolation diodes to prevent output overshoot during startup.