Texas Instruments LM2593HVS-5.0/NOPB

Overview

LM2593HVS-5.0/NOPB from Texas Instruments is a monolithic 150-kHz non-synchronous step-down DC-DC converter delivering up to 2 A output current with ±4% output voltage accuracy, 5-V fixed output, and input voltage range up to 60 V. It integrates internal frequency compensation, soft-start, shutdown control, and out-of-regulation error flag - used in industrial power supplies requiring high-input-voltage buck conversion.

For engineers reviewing the LM2593HVS-5.0/NOPB datasheet, LM2593HVS-5.0/NOPB pinout, LM2593HVS-5.0/NOPB application, or LM2593HVS-5.0/NOPB equivalent, key selection criteria include its 60-V max input rating, 2-A load capability, TO-263-7 package thermal performance (R_θJA = 30°C/W with 0.5 in² copper), integrated error flag with programmable delay, and low 90-μA standby current in shutdown mode.

Technical Context

The LM2593HVS-5.0/NOPB implements a fixed-frequency (150 kHz) current-mode PWM controller with an integrated 2-A N-channel DMOS switch. Its feedback loop references an internal 1.23-V bandgap and uses direct connection of the Feedback pin to the output for fixed 5-V regulation - eliminating external resistor dividers and reducing component count.

Functional modes include active regulation, shutdown (≤0.6 V on SD/SS pin, 90 μA I_Q), and soft-start (capacitor-controlled ramp via SD/SS pin). The Error Flag (open-collector) asserts low when output drops below 95% of nominal, with delay timing set by an external capacitor on the Delay pin charged by a 3-μA current source.

Key Specifications

Pinout & Package

LM2593HVS-5.0/NOPB is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad for enhanced heat dissipation. Package dimensions: 10.10 mm × 8.89 mm, 2.4 mm height. Thermal pad must be soldered to ≥0.5 in² of 1 oz copper for specified R_θJA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2593HV-5.0/NOPB, the TO-220 variant offers easier thermal management with clip-on heatsinks but larger footprint; compared with LM2594HVS-5.0/NOPB, LM2593HVS-5.0/NOPB provides 20 V higher input headroom and proven robustness in 48–60 V industrial systems - making it the preferred choice for high-reliability, wide-input applications.

Availability

LM2593HVS-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for LM2593HVS-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 company headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and digital signal processing technologies since 1930.

The LM2593HV series belongs to TI's SIMPLE SWITCHER® power converter family - engineered for ease-of-use in cost-sensitive, high-reliability DC-DC applications where minimal external components, wide input range, and integrated protection are essential.

FAQ

What is the maximum input voltage rating for LM2593HVS-5.0/NOPB?

The LM2593HVS-5.0/NOPB has an absolute maximum input voltage rating of 63 V, with recommended operation up to 60 V. This enables reliable use in 48 V industrial systems and automotive applications subject to load dump transients. Exceeding 60 V continuously may reduce lifetime or trigger overvoltage protection in upstream circuitry - always verify input transient suppression per ISO 7637-2 or IEC 61000-4-5.

Does LM2593HVS-5.0/NOPB require external feedback resistors?

No, LM2593HVS-5.0/NOPB does not require external feedback resistors. As a fixed 5-V output version, the Feedback (Pin 6) is internally connected to the output, eliminating external divider networks and associated tolerance/temperature drift errors. This simplifies layout, improves regulation accuracy (±4%), and reduces bill-of-materials cost compared to adjustable variants.

How is thermal performance achieved in the TO-263 package of LM2593HVS-5.0/NOPB?

LM2593HVS-5.0/NOPB achieves thermal performance in its TO-263-7 package via an exposed thermal pad soldered directly to ≥0.5 in² of 1 oz copper on the PCB, yielding R_θJA = 30°C/W. This allows full 2-A output at ambient temperatures up to 85°C without additional heatsinking. Proper pad stencil design (≥70% solder paste coverage) and reflow profile adherence are critical to maintain this spec.

Can LM2593HVS-5.0/NOPB be used in a negative-output configuration?

Yes, LM2593HVS-5.0/NOPB can generate a negative output using an inverting buck-boost topology, as documented in TI's application notes (e.g., SNVA263). In this configuration, the Output pin becomes the switch node referenced to the negative rail, and the "ground" connection shifts to the positive output. However, the fixed 5-V version is optimized for positive buck operation - for dedicated negative rails, consider the adjustable LM2593HVS or purpose-built inverting controllers.

What is the function of the Delay pin (Pin 5) on LM2593HVS-5.0/NOPB?

The Delay pin (Pin 5) on LM2593HVS-5.0/NOPB sets the time interval between output regulation and assertion of the open-collector Flag pin (Pin 3). An external capacitor charges via a 3-μA internal current source; when voltage reaches 1.3 V, Flag goes high (with external pull-up), signaling "power good." A 0.1 µF capacitor yields ~43 ms delay - preventing false fault detection during startup overshoot or settling.