Texas Instruments LM2593HVS-5.0

Overview

LM2593HVS-5.0 from Texas Instruments is a monolithic 150-kHz non-synchronous buck DC-DC converter delivering up to 2 A output current with ±4% output voltage accuracy, 4.5–60 V input range, and integrated shutdown/soft-start. It operates in TO-263-7 package and serves as a high-efficiency step-down regulator in industrial power supplies, automotive subsystems, and distributed power architectures.

For engineers reviewing the LM2593HVS-5.0 datasheet, LM2593HVS-5.0 pinout, LM2593HVS-5.0 application, or LM2593HVS-5.0 equivalent, key selection criteria include fixed 5-V output tolerance, 90 μA standby current, out-of-regulation flag signaling, programmable delay timing, and thermal shutdown protection under fault conditions.

Technical Context

The LM2593HVS-5.0 integrates a 150-kHz fixed-frequency oscillator, internal frequency compensation, and a bipolar NPN switch capable of 2-A peak current. Its feedback loop senses output directly (no external divider), enabling stable regulation across line (4.5–60 V) and load (0.2–2 A) variations with ±4% output accuracy.

It implements dual-stage current limiting, thermal shutdown at 150°C junction temperature, and an open-collector error flag (Pin 3) that asserts low ≤1 V when output drops below 95% of nominal. The Delay pin (Pin 5) uses a 3-μA internal current source to charge an external capacitor, setting flag assertion delay after regulation is achieved.

Key Specifications

Pinout & Package

LM2593HVS-5.0 is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad (10.10 mm × 8.89 mm body size). The package supports high-power dissipation with R_θJA = 30°C/W (0.5 in² copper) or 20°C/W (2.5 in² copper).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2593HV-5.0, the LM2593HVS-5.0 offers superior thermal performance in surface-mount form factor, while LM2678-5.0 delivers higher current and frequency at the cost of layout incompatibility and increased complexity in EMI filtering.

Availability

LM2593HVS-5.0 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, and telecom power distribution requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LM2593HVS-5.0 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 ICs, with decades of expertise in high-reliability power conversion solutions.

The LM2593HV family was designed for rugged, wide-input industrial and automotive DC-DC conversion where simplicity, thermal robustness, and fault resilience are prioritized over ultra-high efficiency or ultra-small size.

FAQ

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

The LM2593HVS-5.0 has an absolute maximum input voltage rating of 63 V, with recommended operating range from 4.5 V to 60 V. Exceeding 60 V continuously may reduce reliability or trigger overvoltage protection mechanisms not explicitly specified in the datasheet. For sustained 60-V operation, ensure adequate thermal management using the TO-263 thermal pad and minimum 2.5 in² copper area.

Does LM2593HVS-5.0 require external feedback resistors to set its output voltage?

No, LM2593HVS-5.0 does not require external feedback resistors. As a fixed-output variant, it internally connects the Feedback pin (Pin 6) to the 5-V output node. External connection to this pin is prohibited and may disrupt regulation or damage the device. Only adjustable versions (e.g., LM2593HVS-ADJ) use external resistor dividers.

How does the Flag pin (Pin 3) of LM2593HVS-5.0 behave during startup and fault conditions?

The Flag pin of LM2593HVS-5.0 is an open-collector output that remains high-impedance until the output reaches regulation. After the programmed delay (set by capacitor on Pin 5), it pulls low ≤1 V if VOUT falls below 4.75 V (95% of 5 V). During normal operation, it stays high when pulled up externally (e.g., to VOUT via 4.7 kΩ). It does not assert during brief load transients unless regulation is lost.

Can LM2593HVS-5.0 operate with an input voltage lower than 5 V?

No, LM2593HVS-5.0 requires a minimum input voltage of 4.5 V to maintain regulation, but practical operation below 6.5 V is limited by dropout behavior. At VIN = 6 V, the achievable output drops due to switch saturation voltage (~1.3 V) and diode forward drop, resulting in reduced efficiency and potential instability. For inputs near 5 V, consider LDOs or buck-boost alternatives instead of LM2593HVS-5.0.

What thermal management is required for LM2593HVS-5.0 delivering 2 A at 60-V input?

At 60-V input and 2-A load, LM2593HVS-5.0 dissipates significant power (≈10 W), requiring aggressive thermal design. Use the TO-263 thermal pad soldered to ≥2.5 in² of 1-oz copper (R_θJA = 30°C/W) or ≥3 in² double-sided copper with thermal vias (R_θJA = 20°C/W). Avoid relying solely on ambient convection; add a small heatsink if junction temperature exceeds 125°C under worst-case conditions.