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Texas Instruments LM2594HVMX-12
- Part No.:
- LM2594HVMX-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594HVMX-12.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,054
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Product details
Overview
LM2594HVMX-12 from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter delivering 12 V at up to 0.5 A, with input voltage support up to 60 V, ±4% output voltage tolerance, and 150-kHz fixed-frequency operation - used in industrial power supplies, automotive subsystems, and distributed point-of-load conversion.
For engineers reviewing the LM2594HVMX-12 datasheet, LM2594HVMX-12 pinout, LM2594HVMX-12 application, or LM2594HVMX-12 equivalent, key selection factors include HV input capability (60 V max), thermal shutdown protection, TTL-compatible ON/OFF control, and SOIC-8 surface-mount packaging for board space-constrained designs.
Technical Context
The LM2594HVMX-12 integrates a PWM controller, power switch, oscillator, and internal compensation in a single chip. It operates in continuous conduction mode by default, supports discontinuous mode at light loads, and uses external diode/inductor/capacitor for buck topology implementation.
Its feedback loop senses output via internal 1.23-V reference and external resistor divider; ON/OFF pin enables logic-level shutdown with 1.3-V threshold and 85-μA standby current. Thermal shutdown activates at 150°C junction temperature, and current limiting engages at 0.65–1.3-A peak switch current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over line/load/temperature - ensures stable rail for downstream logic or analog circuitry without external adjustment. |
| Max Input Voltage | 60 V - supports wide-range industrial or automotive inputs including 48-V systems and transient-tolerant designs. |
| Output Current | 0.5 A DC - sufficient for powering microcontrollers, sensors, or interface ICs in embedded systems. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, standard off-the-shelf inductors and simplifies EMI filtering design. |
| Quiescent Current | 140–250 μA - minimizes no-load power loss in battery-backed or always-on applications. |
| Standby Current | 85 μA - allows deep-sleep operation when ON/OFF pin is pulled high, extending system runtime. |
| Thermal Shutdown | 150°C - protects device under overload or poor heatsinking conditions without external circuitry. |
Pinout & Package
LM2594HVMX-12 is supplied in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and standard surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; must be soldered to PCB ground plane for thermal relief but carry no signal. |
| 4 | Feedback | Input sensing node for output voltage regulation; connects to resistor divider to set feedback reference at 1.23 V. |
| 5 | ON/OFF | Logic-controlled enable/disable input; <1.3 V = ON, >1.3 V = OFF; supports remote shutdown and delayed start-up circuits. |
| 6 | Ground | Power and signal reference return path; requires low-impedance connection to minimize noise and thermal resistance. |
| 7 | +VIN | Main power input; accepts 4.5–60 V; requires local 68-μF tantalum bypass capacitor to suppress switching transients. |
| 8 | Output | Internal power switch drain node; connects to external catch diode and inductor; switches between VIN−VSAT and −0.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V Output | Eliminates external feedback resistors, reducing BOM count and layout complexity for dedicated 12-V rails. |
| 60-V Input Rating | Enables direct operation from unregulated 48-V industrial buses or automotive batteries with load dump immunity. |
| TTL-Compatible Enable | Allows seamless integration with microcontroller GPIOs or system-level power sequencing without level-shifting. |
| Internal Compensation | Removes need for external compensation network, shortening design cycle and improving stability across component tolerances. |
| Thermal + Current Protection | Provides autonomous fault recovery without external monitoring circuitry - critical for unattended industrial deployments. |
Applications
| Industrial Power Supply | Automotive Subsystem |
|---|---|
Use Scenario: Converting 24–48 V DC bus to regulated 12 V for PLC I/O modules, motor drivers, or field transmitters. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, stable 12-V bias for analog front-ends and digital controllers. Use Value: Delivers 0.5 A with ±4% accuracy and 88% efficiency at 25-V input, reducing heat sink requirements and enabling compact DIN-rail mount designs. | Use Scenario: Generating 12 V from vehicle battery (9–16 V nominal, up to 60 V during load dump) for infotainment head units or ADAS camera modules. IC Role / Device Role / Timing Role: High-input-voltage buck converter handling automotive transients while maintaining clean 12-V rail for sensitive electronics. Use Value: Withstands 60-V absolute max rating and includes thermal shutdown, eliminating need for external overvoltage clamping in cost-sensitive modules. |
| Point-of-Load Converter | Inverting Power Supply |
Use Scenario: Local 12-V generation on dense PCBs where centralized 12-V distribution causes IR drop or noise coupling. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator minimizing trace length and improving PSRR for noise-sensitive ADCs or RF receivers. Use Value: SOIC-8 package fits tight layouts; 150-kHz frequency avoids sensitive bands while enabling small 100-μH inductors and low-ESR capacitors. | Use Scenario: Generating −12 V from +24 V supply for op-amp dual-rail biasing or RS-485 transceivers requiring negative voltage. IC Role / Device Role / Timing Role: Configured as inverting regulator using external diodes and feedback grounding to produce stable negative output. Use Value: Leverages same 12-V fixed-output IC for bipolar supplies - reduces inventory and qualification effort versus dedicated inverting ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594MX-12 | Standard version with 40-V max input (vs. 60 V for LM2594HVMX-12); identical pinout, package, and electrical specs otherwise. | Suitable only for ≤40-V input systems; not rated for automotive load dump or 48-V industrial transients. | Select LM2594MX-12 only when input never exceeds 40 V and cost is prioritized over HV margin. |
| LMR36506RNXR | Synchronous buck with 3–65-V input, 0.6-A output, 2.1-MHz switching, integrated FETs, and smaller solution size - replaces external diode/inductor. | Requires redesign: different pinout, higher frequency demands tighter layout, and lacks HV-specific robustness testing. | Choose LMR36506RNXR for new designs needing higher efficiency (>90%), smaller footprint, and lower IQ - not for drop-in replacement. |
Compared with LM2594MX-12, LM2594HVMX-12 adds 20-V input headroom critical for transient resilience; compared with LMR36506RNXR, it trades modern synchronous efficiency for proven simplicity, external component flexibility, and legacy design compatibility.
Availability
LM2594HVMX-12 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and distributed power systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LM2594HVMX-12 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 90 years of innovation in industrial and automotive electronics.
The LM2594HV product line delivers rugged, easy-to-use step-down regulators targeting cost-sensitive, high-reliability applications where wide input range, thermal resilience, and minimal external components are essential.
FAQ
What is the maximum input voltage rating for LM2594HVMX-12?
The LM2594HVMX-12 has an absolute maximum input voltage rating of 60 V, with recommended operating range from 4.5 V to 60 V. This HV rating enables reliable operation in 48-V industrial systems and automotive environments subject to load dump transients. The standard LM2594MX-12 variant is limited to 40 V, making LM2594HVMX-12 the correct choice when input may exceed that threshold.
Does LM2594HVMX-12 require external compensation components?
No, LM2594HVMX-12 features fully internal frequency compensation, eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design, improves stability across temperature and component tolerances, and reduces bill-of-materials count. The fixed 12-V output version further removes the need for external feedback resistors, making LM2594HVMX-12 a true 4-component solution (inductor, diode, input cap, output cap).
How does the ON/OFF pin function on LM2594HVMX-12?
The ON/OFF pin (Pin 5) provides TTL-compatible logic-level control: pulling below ~1.3 V (referenced to GND) enables regulation, while pulling above ~1.3 V disables the switcher and reduces total input current to 85 μA. If unused, the pin can be tied directly to GND for permanent enable. This feature supports remote power sequencing, battery-saving sleep modes, and delayed start-up circuits using RC networks - all without additional driver circuitry.
What package type is used for LM2594HVMX-12?
LM2594HVMX-12 is packaged in an 8-pin SOIC (D) surface-mount package with nominal body dimensions of 4.90 mm × 3.91 mm. Pins 1–3 are no-connect but must be soldered to PCB copper for thermal conduction. This package offers better thermal performance than the PDIP variant and is compatible with standard reflow assembly processes, making LM2594HVMX-12 suitable for automated high-volume manufacturing.
Can LM2594HVMX-12 be used in inverting regulator configurations?
Yes, LM2594HVMX-12 can be configured as an inverting regulator to generate negative output voltages such as −12 V from a positive input. This requires relocating the GND pin to the output node, grounding the FB pin, and adding external diodes (D1, D3) per TI's Figure 8-5 reference design. While the fixed 12-V version is optimized for buck operation, its architecture supports this topology - though efficiency and startup behavior differ from standard buck use, and maximum |VIN| + |VOUT| must remain ≤60 V.
LM2594HVMX-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2594HVMX-12 FAQ
1.How can I place an order for LM2594HVMX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVMX-12 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 LM2594HVMX-12 reliable?
The price and inventory of LM2594HVMX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594HVMX-12 is usually 5 days.
3.What payment methods are accepted for LM2594HVMX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVMX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVMX-12?
LM2594HVMX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVMX-12 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 LM2594HVMX-12?
For technical support, including LM2594HVMX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVMX-12 requirements.
6.How does Aetrix verify that LM2594HVMX-12 is sourced from the original manufacturer or authorized distributors?
All LM2594HVMX-12 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 LM2594HVMX-12 meets industry standards.
7.What is the process for return or replacement of LM2594HVMX-12?
All LM2594HVMX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVMX-12, 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 LM2594HVMX-12 part is unused and in its original packaging.
Return procedure for LM2594HVMX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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