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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM2593HVS-3.3

Name: LM2593HVS-3.3
Brand: Texas Instruments
SKU: LM2593HVS-3.3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2593HVS-3.3

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: TO-263-8, D2PAK (7 Leads + Tab), TO-263CA

Datasheet:: LM2593HVS-3.3.pdf

Description:: IC REG BUCK 3.3V 2A TO263

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Product details

Overview

LM2593HVS-3.3 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 (3.3 V ±0.132 V), 4.75–60 V input range, and 76% efficiency at 12 V_IN/2 A. It integrates internal frequency compensation, thermal shutdown, current limiting, and an out-of-regulation error flag-designed for industrial power supplies requiring robust 3.3-V rail generation.

For engineers reviewing the LM2593HVS-3.3 datasheet, LM2593HVS-3.3 pinout, LM2593HVS-3.3 application, or LM2593HVS-3.3 equivalent, key selection criteria include its 60-V max input rating, TO-263-7 package thermal performance (R_θJA = 30°C/W with 0.5 in² copper), soft-start/shutdown control via SD/SS pin, and fixed 3.3-V output eliminating external feedback resistors.

Technical Context

The LM2593HVS-3.3 implements a fixed-frequency (150 kHz, ±15%) current-mode PWM architecture with integrated 2-A N-channel MOSFET switch and internal oscillator. Its control loop uses voltage-mode feedback referenced to a 1.23-V internal bandgap, with direct connection of Feedback (Pin 6) to Output (Pin 2) in the fixed 3.3-V variant-eliminating external divider networks and reducing component count.

Functional supervision includes an open-collector Flag (Pin 3) asserting low ≤1 V when output drops below 95% of nominal, programmable delay via capacitor on Delay (Pin 5), and Shutdown/Soft-start (Pin 7) enabling <90 μA standby current and controlled output ramp-up. Protection features comprise two-stage current limit, thermal shutdown, and undervoltage lockout derived from SD/SS pin biasing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3 V ±4% (±0.132 V) over full line/load/temperature range-guarantees stable logic rail without trimming.
Max Input Voltage	60 V-supports wide-input industrial, automotive, and telecom applications without pre-regulation.
Output Current	2 A continuous-drives FPGA I/O banks, microcontroller cores, or multiple peripherals directly.
Switching Frequency	150 kHz ±15%-enables use of compact 10–47 µH inductors and standard electrolytic output capacitors.
Quiescent Current	90 µA typical in shutdown-minimizes battery drain in always-on systems.
Efficiency	76% at 12 V_IN, 2 A load-reduces thermal load vs. linear regulators in medium-power applications.
Thermal Resistance	R_θJA = 30°C/W (TO-263, 0.5 in² copper)-enables 2-A operation without external heatsink under moderate ambient conditions.

Pinout & Package

LM2593HVS-3.3 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 thermal pad must be soldered to ≥0.5 in² of PCB copper for rated 2-A operation.

Pin/Terminal	Circuit Role	Design Meaning
1 VIN	Positive input supply	Accepts 4.75–60 V; requires low-ESR input capacitor (≥470 µF) placed adjacent to minimize switching noise injection.
2 Output	Switch node	Drives external diode and inductor; swings between ~VIN–1.3 V (ON) and –0.5 V (OFF); connects directly to FB in fixed 3.3-V version.
3 Flag	Open-collector error flag	Asserts low ≤1 V when V_OUT < 3.135 V; sinks ≤3 mA; requires external pull-up (4.7 kΩ typical) to monitor power-good status.
4 Ground	Power and signal reference	Common return for input/output paths; must be low-impedance plane tied to thermal pad for thermal and EMI control.
5 Delay	Flag delay timing	Charged by 3 µA internal current source; sets power-up delay before Flag goes high-0.1 µF yields ~430 ms delay.
6 Feedback	Voltage sense input	Internally tied to Output pin in LM2593HVS-3.3-no external resistor network required; simplifies layout and improves stability.
7 SD/SS	Shutdown/Soft-start control	Drives low ≤0.6 V for shutdown (<90 µA IQ); floats or >2 V for active mode; adding capacitor enables controlled V_OUT ramp.

Key Features

Feature	Design Value
Fixed 3.3-V output	Eliminates external feedback resistors-reduces BOM count, layout area, and potential drift from resistor tolerance/temperature.
Integrated soft-start	Capacitor on SD/SS pin controls output voltage slew rate-prevents inrush current into large output capacitance or downstream loads.
Programmable power-good delay	Capacitor on Delay pin sets time from regulation to Flag assertion-enables sequenced power-up in multi-rail systems.
Out-of-regulation detection	Flag pin asserts within microseconds of V_OUT dropping below 95%-provides real-time fault signaling for system monitoring or reset generation.
Thermal and current protection	Two-stage current limit + thermal shutdown prevent damage during overload, short-circuit, or inadequate heatsinking-no external protection circuitry needed.

Applications

Industrial PLC Power Supply	Automotive Body Control Module
Use Scenario: Generating a clean 3.3-V rail for ARM Cortex-M7 microcontrollers and CAN transceivers in programmable logic controllers operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24–36 V input to isolated 3.3-V logic supply with tight transient response. Use Value: 60-V input rating tolerates load-dump transients; 2-A capability supports peak MCU+peripheral current; Flag pin triggers watchdog reset on brownout.	Use Scenario: Powering infotainment SoC I/O domains and sensor interfaces in 12-V automotive systems subject to cold-crank (down to 4.5 V). IC Role / Device Role / Timing Role: Buck converter supplying regulated 3.3-V rail with fast line transient recovery during engine start. Use Value: 4.75-V minimum input ensures operation during cranking; 76% efficiency reduces cabin heat; TO-263 package withstands automotive thermal cycling.
Telecom Remote Radio Unit	Test Equipment Digital Logic Supply
Use Scenario: Providing 3.3-V power to FPGAs and ADCs in outdoor base station radios powered from 48-V PoE or -48-V DC distribution. IC Role / Device Role / Timing Role: High-input-voltage buck regulator stepping down 48–60 V to 3.3 V with minimal external components. Use Value: 60-V absolute max input handles 48-V surge events; soft-start prevents inrush into large FPGA decoupling caps; Flag confirms stable rail before FPGA configuration.	Use Scenario: Delivering precise 3.3-V supply to high-speed digital ICs (e.g., LVDS serializers, memory interfaces) in automated test equipment with strict noise requirements. IC Role / Device Role / Timing Role: Low-noise, well-regulated DC-DC source replacing linear regulators to avoid thermal derating at 2 A. Use Value: Fixed 3.3-V output eliminates resistor mismatch errors; 150-kHz switching allows filtering with standard ferrite beads; thermal pad ensures consistent 2-A output across temperature.

Industrial PLC Power Supply

Automotive Body Control Module

Use Scenario: Generating a clean 3.3-V rail for ARM Cortex-M7 microcontrollers and CAN transceivers in programmable logic controllers operating from 24-V DC bus.

IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24–36 V input to isolated 3.3-V logic supply with tight transient response.

Use Value: 60-V input rating tolerates load-dump transients; 2-A capability supports peak MCU+peripheral current; Flag pin triggers watchdog reset on brownout.

Use Scenario: Powering infotainment SoC I/O domains and sensor interfaces in 12-V automotive systems subject to cold-crank (down to 4.5 V).

IC Role / Device Role / Timing Role: Buck converter supplying regulated 3.3-V rail with fast line transient recovery during engine start.

Use Value: 4.75-V minimum input ensures operation during cranking; 76% efficiency reduces cabin heat; TO-263 package withstands automotive thermal cycling.

Telecom Remote Radio Unit

Test Equipment Digital Logic Supply

Use Scenario: Providing 3.3-V power to FPGAs and ADCs in outdoor base station radios powered from 48-V PoE or -48-V DC distribution.

IC Role / Device Role / Timing Role: High-input-voltage buck regulator stepping down 48–60 V to 3.3 V with minimal external components.

Use Value: 60-V absolute max input handles 48-V surge events; soft-start prevents inrush into large FPGA decoupling caps; Flag confirms stable rail before FPGA configuration.

Use Scenario: Delivering precise 3.3-V supply to high-speed digital ICs (e.g., LVDS serializers, memory interfaces) in automated test equipment with strict noise requirements.

IC Role / Device Role / Timing Role: Low-noise, well-regulated DC-DC source replacing linear regulators to avoid thermal derating at 2 A.

Use Value: Fixed 3.3-V output eliminates resistor mismatch errors; 150-kHz switching allows filtering with standard ferrite beads; thermal pad ensures consistent 2-A output across temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2593HV-3.3	Same electrical specs but in TO-220-7 package (R_θJA = 50°C/W); no thermal pad; leaded through-hole mounting.	Suitable for prototyping or low-volume assemblies where surface-mount reflow is unavailable.	Select LM2593HV-3.3 only if manual assembly or legacy board compatibility is required-thermal performance is 40% worse than LM2593HVS-3.3.
LM2678-3.3	Higher 63-V max input, 5-A output, 260-kHz switching; different pinout; no Flag or Delay pins.	Better suited for higher-current applications where fault signaling is handled externally.	Choose LM2678-3.3 when >2 A is needed or when faster transient response justifies redesign-LM2593HVS-3.3 offers superior integration for 2-A fixed-output use cases.

Compared with LM2593HV-3.3, LM2593HVS-3.3 delivers 33% lower thermal resistance and surface-mount reliability; versus LM2678-3.3, it provides dedicated power-good signaling and simpler layout at 2-A scale-making it optimal for cost-sensitive, space-constrained 3.3-V buck designs.

Availability

LM2593HVS-3.3 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, telecom remote radio units, and test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LM2593HVS-3.3 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 DC-DC conversion.

The LM2593HV family was designed for rugged, low-component-count buck regulation in industrial, automotive, and telecom systems-emphasizing wide input range, integrated protection, and ease of use without sacrificing performance.

FAQ

What is the maximum input voltage rating for LM2593HVS-3.3?

The LM2593HVS-3.3 has an absolute maximum input voltage rating of 63 V, with recommended operation up to 60 V. This allows reliable use in 48-V telecom, 24-V industrial, and 12-V automotive systems-including transient conditions like load dump. Exceeding 63 V risks permanent damage per Absolute Maximum Ratings.

Does LM2593HVS-3.3 require external feedback resistors?

No. The LM2593HVS-3.3 is the fixed 3.3-V output variant-its Feedback (Pin 6) is internally connected to the Output (Pin 2), eliminating the need for external resistor dividers. This simplifies design, improves accuracy by removing resistor tolerance errors, and enhances thermal stability compared to adjustable versions.

How does the Flag pin on LM2593HVS-3.3 function?

The Flag pin (Pin 3) is an open-collector output that pulls low (≤1 V) when the regulated output falls below 95% of 3.3 V (i.e., <3.135 V), indicating out-of-regulation. It sinks up to 3 mA and requires an external pull-up resistor (typically 4.7 kΩ to 3.3–5 V). During startup, it remains low until the Delay pin capacitor charges, then goes high to signal "power good."

What thermal performance can be expected from LM2593HVS-3.3 in its TO-263 package?

In the TO-263-7 (KTW) package with 0.5 in² of 1-oz copper connected to the thermal pad, LM2593HVS-3.3 achieves R_θJA = 30°C/W. At 2 A output and 12 V input, this allows ~2.6 W dissipation with ~78°C junction rise above ambient-enabling full-rated operation without a heatsink in typical industrial environments (≤70°C ambient).

Can LM2593HVS-3.3 be used in shutdown mode to reduce system power consumption?

Yes. Driving the SD/SS pin (Pin 7) to ≤0.6 V places LM2593HVS-3.3 in shutdown mode, reducing quiescent current to 90 µA typical (200 µA max). This is ideal for battery-backed systems or standby states. The output is disabled, Flag goes low, and internal switching ceases-while maintaining fast wake-up (<100 µs) when SD/SS is released or pulled high.

LM2593HVS-3.3 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: SIMPLE SWITCHER®

Package/Case:: TO-263-8, D2PAK (7 Leads + Tab), TO-263CA

Packaging:: Tube

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 4.5V

Voltage - Input (Max):: 60V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Current - Output:: 2A

Frequency - Switching:: 150kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-263 (DDPAK-7)

LM2593HVS-3.3 FAQ

1.How can I place an order for LM2593HVS-3.3 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2593HVS-3.3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM2593HVS-3.3 reliable?

The price and inventory of LM2593HVS-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2593HVS-3.3 is usually 5 days.

3.What payment methods are accepted for LM2593HVS-3.3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2593HVS-3.3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2593HVS-3.3?

LM2593HVS-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2593HVS-3.3 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM2593HVS-3.3?

For technical support, including LM2593HVS-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2593HVS-3.3 requirements.

6.How does Aetrix verify that LM2593HVS-3.3 is sourced from the original manufacturer or authorized distributors?

All LM2593HVS-3.3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2593HVS-3.3 meets industry standards.

7.What is the process for return or replacement of LM2593HVS-3.3?

All LM2593HVS-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2593HVS-3.3, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM2593HVS-3.3 part is unused and in its original packaging.

Return procedure for LM2593HVS-3.3:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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