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Texas Instruments LM2593HVSX-3.3
- Part No.:
- LM2593HVSX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2593HVSX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 2A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,650
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Product details
Overview
LM2593HVSX-3.3 from Texas Instruments is a monolithic 150-kHz non-synchronous step-down DC-DC converter delivering up to 2-A load current with ±4% output voltage accuracy, 3.3-V fixed output, and input voltage support up to 60 V. It integrates internal frequency compensation, thermal shutdown, current limiting, and an out-of-regulation error flag - used in industrial power supplies requiring high-input-voltage buck conversion.
For engineers reviewing the LM2593HVSX-3.3 datasheet, LM2593HVSX-3.3 pinout, LM2593HVSX-3.3 application, or LM2593HVSX-3.3 equivalent, key selection criteria include its 60-V max input rating, 2-A guaranteed output, TO-263-7 package thermal performance, soft-start/shutdown control, and ±4% output tolerance across line/load/temperature.
Technical Context
The LM2593HVSX-3.3 implements a fixed-frequency (150 kHz) current-mode PWM architecture with an integrated N-channel MOSFET switch, internal oscillator, and error amplifier. Its feedback loop references a precision 1.23-V bandgap reference, enabling tight regulation without external resistors for the 3.3-V version.
It features dual-stage overcurrent protection (peak and foldback), undervoltage lockout via SD/SS pin control, and a programmable delay for the open-collector FLAG output. The device operates across –40°C to +125°C junction temperature and supports low-quiescent standby mode (90 µA typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line (4.75–60 V), load (0.2–2 A), and temperature (–40°C to +125°C) |
| Max Input Voltage | 60 V - enables direct use with 48-V industrial rails, automotive battery transients, and PoE-powered systems |
| Output Current | Guaranteed 2 A DC - supports mid-power embedded systems without external current boosting |
| Switching Frequency | 150 kHz ±15% - allows compact magnetics and EMI filtering vs. lower-frequency alternatives |
| Quiescent Current | 90 µA typical in shutdown - minimizes system standby power in always-on applications |
| Efficiency | 76% at VIN = 12 V, IOUT = 2 A - balances thermal performance and conversion loss in space-constrained designs |
| Thermal Resistance | RθJA = 30°C/W (TO-263, 0.5 in² copper) - enables 2-A operation without heatsink under moderate ambient conditions |
Pinout & Package
LM2593HVSX-3.3 is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad. The package measures 10.10 mm × 8.89 mm and requires soldering of the thermal pad to PCB copper for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply | Accepts 4.75–60 V DC; requires local low-ESR bypass capacitor to handle high di/dt switching currents |
| 2 - Output | Switch node | Drives external Schottky diode and inductor; swings between ~VIN–1.3 V and –0.5 V during operation |
| 3 - Flag | Error flag output | Open-collector signal active low (<1 V) when output drops below 95% of 3.3 V; sinks ≤3 mA |
| 4 - Ground | Power and signal reference | Common return for input/output paths and internal circuitry; must be low-impedance connection to thermal pad |
| 5 - Delay | Flag delay timing | Controls power-good assertion delay via external capacitor; 3 µA internal charge current sets delay time |
| 6 - Feedback | Regulation sense | Internally tied to output for 3.3-V version; not user-adjustable - eliminates resistor divider errors |
| 7 - SD/SS | Shutdown/Soft-start control | Drives low (≤0.6 V) for shutdown (90 µA IQ); floats or pulled high (≥2 V) for normal operation; capacitor adds soft-start ramp |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2-A switch | Eliminates need for external MOSFET and gate driver - reduces BOM count and layout complexity |
| Out-of-regulation FLAG | Provides system-level fault detection and sequencing control without external comparators or logic |
| Programmable FLAG delay | Enables clean power-good signaling after output stabilization - avoids false triggers during startup |
| Thermal shutdown + current limit | Two-stage protection prevents damage during overload, short-circuit, or poor heatsinking conditions |
| Soft-start via SD/SS pin | Prevents inrush current into output capacitors - critical for reliability in multi-rail or battery-fed systems |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converts 24-V or 48-V vehicle or factory bus to stable 3.3-V rail for microcontrollers and sensors. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3-V domain with fault reporting. Use Value: Withstands 60-V transients and delivers 2-A continuously - meets ISO 16750-2 pulse requirements without derating. | Use Scenario: Powers CAN transceiver, EEPROM, and low-power MCU in door module or lighting ECU. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator stepping down battery voltage before LDO post-regulation. Use Value: 76% efficiency at 2 A reduces heat buildup in sealed enclosures; FLAG pin enables diagnostics via microcontroller GPIO. |
| Telecom Remote Radio Unit | Test & Measurement Equipment |
Use Scenario: Supplies 3.3-V logic rail in outdoor base station radios powered from 48-V DC plant. IC Role / Device Role / Timing Role: Front-end DC-DC stage handling wide input range and thermal cycling. Use Value: TO-263 thermal pad and 30°C/W RθJA allow operation at full 2-A load up to +85°C ambient without heatsink. | Use Scenario: Generates clean 3.3-V supply for FPGA configuration, ADC reference, and digital logic in portable analyzers. IC Role / Device Role / Timing Role: Main system regulator with soft-start and FLAG-based power sequencing. Use Value: Soft-start prevents supply droop during FPGA configuration; FLAG delay ensures stable clock before firmware boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2593HVT-3.3 | Same electrical specs but in TO-220-7 package; higher RθJA (50°C/W) and no thermal pad | Better suited for prototyping or low-volume through-hole assembly; less suitable for high-density SMT layouts | Select if manual soldering, heatsink mounting, or vertical board orientation is preferred |
| LM2678SD-3.3 | Higher 5-A rating, 260-kHz switching, different pinout; no FLAG or Delay pins; requires external soft-start | Targets higher-current loads; lacks integrated power-good signaling and programmable delay | Choose when >2 A is needed and FLAG functionality is unnecessary or implemented externally |
Compared with LM2593HVSX-3.3, the TO-220 variant trades thermal performance for mechanical flexibility, while the LM2678SD-3.3 offers higher current at the cost of reduced integration and diagnostic capability - making LM2593HVSX-3.3 optimal for space-constrained, fault-aware 2-A applications.
Availability
LM2593HVSX-3.3 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2593HVSX-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 over 50 years of innovation in high-reliability power conversion.
The LM2593HV series was designed for rugged, high-input-voltage step-down applications in harsh environments - targeting industrial, automotive, and telecom systems where input transients, thermal stress, and functional safety monitoring are critical.
FAQ
What is the maximum input voltage rating for the LM2593HVSX-3.3?
The LM2593HVSX-3.3 has an absolute maximum input voltage rating of 63 V, with recommended operation up to 60 V. This allows direct interface with 48-V industrial buses, automotive 24-V systems with load-dump transients, and PoE-powered equipment. Operation above 60 V risks exceeding safe operating area limits and may trigger internal protection circuits.
Does the LM2593HVSX-3.3 require external feedback resistors?
No, the LM2593HVSX-3.3 does not require external feedback resistors. As a fixed 3.3-V output variant, the feedback pin (Pin 6) is internally connected to the output, eliminating resistor-divider tolerance errors and simplifying design. This differs from the adjustable version (LM2593HVSX-ADJ), which requires an external resistor network to set VOUT.
How does the FLAG pin function on the LM2593HVSX-3.3?
The FLAG pin (Pin 3) on the LM2593HVSX-3.3 is an open-collector output that goes low (≤1 V) when the regulated output falls below 95% of 3.3 V (i.e., <3.135 V). It can sink up to 3 mA and is typically pulled up to a logic rail. When asserted, it signals "power fail" to host controllers - enabling system-level fault response, sequencing, or watchdog reset. The delay pin (Pin 5) controls its assertion timing.
Can the LM2593HVSX-3.3 operate without a heatsink in a TO-263 package?
Yes, the LM2593HVSX-3.3 in the TO-263-7 (KTW) package can operate at full 2-A load without an external heatsink when mounted on ≥0.5 in² of 1-oz copper. Its RθJA is 30°C/W under this condition, resulting in ~60°C junction rise above ambient at 2 A and 12 V input. For continuous 2-A operation above +85°C ambient, additional copper area or airflow is recommended to maintain TJ ≤125°C.
What protection features are built into the LM2593HVSX-3.3?
The LM2593HVSX-3.3 integrates thermal shutdown, two-stage current limiting (peak and foldback), undervoltage lockout (via SD/SS pin), and overvoltage clamp on all pins. It also features low-power shutdown mode (90 µA typical IQ) and internal frequency compensation - eliminating need for external compensation components. These protections ensure robust operation during start-up, overload, short-circuit, or thermal stress events.
LM2593HVSX-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:
- Tape & Reel (TR)
- 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)
LM2593HVSX-3.3 FAQ
1.How can I place an order for LM2593HVSX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2593HVSX-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 LM2593HVSX-3.3 reliable?
The price and inventory of LM2593HVSX-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 LM2593HVSX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2593HVSX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2593HVSX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2593HVSX-3.3?
LM2593HVSX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2593HVSX-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 LM2593HVSX-3.3?
For technical support, including LM2593HVSX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2593HVSX-3.3 requirements.
6.How does Aetrix verify that LM2593HVSX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2593HVSX-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 LM2593HVSX-3.3 meets industry standards.
7.What is the process for return or replacement of LM2593HVSX-3.3?
All LM2593HVSX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2593HVSX-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 LM2593HVSX-3.3 part is unused and in its original packaging.
Return procedure for LM2593HVSX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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