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Texas Instruments LM2594HVMX-12/NOPB
- Part No.:
- LM2594HVMX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594HVMX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,005
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Product details
Overview
LM2594HVMX-12/NOPB from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers 0.5-A regulated 12-V output from up to 60-V input, features 150-kHz fixed-frequency operation, ±4% output voltage accuracy over line/load/temperature, and integrated thermal shutdown and current-limit protection. Used in on-card switching regulators and efficient preregulators.
For engineers reviewing the LM2594HVMX-12/NOPB datasheet, LM2594HVMX-12/NOPB pinout, LM2594HVMX-12/NOPB application, or LM2594HVMX-12/NOPB equivalent, key selection criteria include HV input capability (60 V), fixed 12-V output, SOIC-8 package compatibility, standby current (85 μA), and external component count (only four required).
Technical Context
The LM2594HVMX-12/NOPB implements a buck topology with an internal NPN switch, fixed 150-kHz oscillator, and voltage-mode control loop. It uses external diode, inductor, and capacitors for regulation and requires no external compensation due to internal frequency compensation.
Its ON/OFF pin supports TTL-compatible shutdown with 1.3-V threshold, enabling logic-controlled enable/disable. The feedback loop senses output via internal 12-V resistor divider (no external resistors needed), and saturation voltage is specified at 1.1 V typical under 0.5-A load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line, load, and temperature range - eliminates need for external feedback resistors. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial rails, battery stacks, and automotive cold-crank conditions. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and analog circuitry without heatsinking in SOIC-8. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, standard off-the-shelf inductors and reduces EMI filtering complexity. |
| Quiescent Current | 140–250 μA over temperature - ensures low standby power in always-on systems. |
| Standby Current | 85 μA typical - achieved by pulling ON/OFF pin high; allows deep sleep mode in battery-backed applications. |
| Thermal Protection | Internal thermal shutdown - disables output when junction temperature exceeds safe limit, preventing damage during overload or poor airflow. |
Pinout & Package
LM2594HVMX-12/NOPB is housed 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 | NC | No internal connection; must be soldered to PCB ground plane for optimal thermal transfer. |
| 4 | Feedback | Internally connected to 12-V output divider; not accessible - fixed-output version requires no external resistor network. |
| 5 | ON/OFF | Logic-level shutdown input; <1.3 V = ON, >1.3 V = OFF; draws only 5–15 μA, enabling direct MCU GPIO control. |
| 6 | Ground | Power and signal reference node; must be low-impedance connection to minimize noise and thermal resistance. |
| 7 | +VIN | Main power input; requires local 68-μF tantalum bypass capacitor to handle high peak switching currents. |
| 8 | Output | Switch node - connects to external catch diode and inductor; voltage swings between (VIN − VSAT) and ~−0.5 V; minimal copper area recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V Output | Eliminates external feedback resistors and associated layout sensitivity, reducing BOM count and improving long-term stability. |
| 60-V Maximum Input | Supports direct connection to 48-V industrial buses, 36-V battery systems, and automotive 24-V nominal with cold-crank margin. |
| TTL-Compatible Shutdown | Enables seamless integration with microcontroller GPIOs without level-shifting, simplifying system power sequencing. |
| Only Four External Components | Requires just one inductor, one catch diode, and two capacitors - accelerates design cycle and improves reliability vs. discrete solutions. |
| Internal Frequency Compensation | Removes need for external compensation network, guaranteeing stable operation across all operating conditions without tuning. |
Applications
| Industrial Power Supply | Automotive Pre-regulator |
|---|---|
Use Scenario: Converting 48-V rail to stable 12-V for PLC I/O modules and fieldbus transceivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated 12-V bias for downstream LDOs and analog front-ends. Use Value: Delivers 0.5-A at ±4% accuracy with 60-V input tolerance, ensuring uninterrupted operation during brownouts and transients. | Use Scenario: Generating clean 12-V supply from vehicle battery (9–16 V nominal, up to 60 V during load dump) for infotainment head units. IC Role / Device Role / Timing Role: High-voltage preregulator preceding low-noise linear regulators that power audio DACs and RF receivers. Use Value: Withstands 60-V load dump pulses and maintains regulation down to 4.5-V start-up, eliminating need for external TVS clamping. |
| On-Card DC-DC Converter | Positive-to-Negative Converter |
Use Scenario: Local 12-V generation on dense PCBs where space prohibits through-hole transformers or large modules. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing inefficient linear regulators on mixed-signal boards. Use Value: SOIC-8 footprint and four-component requirement enable placement directly beside load, minimizing trace inductance and voltage drop. | Use Scenario: Deriving −12-V rail from +24-V supply for op-amp dual supplies in test equipment and data acquisition systems. IC Role / Device Role / Timing Role: Inverting buck-boost configuration using internal switch and external diodes/inductor/capacitors. Use Value: Leverages same 60-V input rating and 0.5-A capability to generate negative output without 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/NOPB | Lower 40-V max input; identical pinout, 12-V output, and SOIC-8 package. | Suitable only for ≤40-V systems; cannot withstand 60-V load dump or industrial transients. | Select when input never exceeds 40 V and cost sensitivity outweighs HV margin. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6-A, 2.1-MHz switching, integrated FETs, smaller solution size. | Higher efficiency (>90%), lower EMI, but requires different layout and external compensation. | Choose for new designs prioritizing efficiency, size, and modern synchronous architecture over legacy compatibility. |
Compared with LM2594HVMX-12/NOPB, LM2594MX-12/NOPB sacrifices HV robustness for cost, while LMR36506RNXR replaces nonsynchronous topology with synchronous operation, delivering higher efficiency and frequency at the expense of design familiarity and external component simplicity.
Availability
LM2594HVMX-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and embedded power management requiring stable component supply across extended product lifecycles.
Supply support for LM2594HVMX-12/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 leader specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability power conversion ICs.
The LM2594HV product line was engineered for rugged, high-input-voltage DC-DC conversion in industrial, transportation, and telecom infrastructure where input transients and wide VIN ranges are common.
FAQ
What is the maximum input voltage rating for LM2594HVMX-12/NOPB?
The LM2594HVMX-12/NOPB has a maximum input voltage rating of 60 V, confirmed in the Absolute Maximum Ratings table and explicitly designated by the "HV" suffix. This enables reliable operation in 48-V industrial systems and automotive load-dump scenarios where transient voltages reach 60 V. Operation above this voltage risks permanent damage to the internal NPN switch.
Does LM2594HVMX-12/NOPB require external feedback resistors?
No, LM2594HVMX-12/NOPB does not require external feedback resistors because it is a fixed 12-V output variant. The feedback divider is fully internal, connecting pin 4 (Feedback) directly to the 12-V output node. This eliminates resistor tolerance errors and layout sensitivity, simplifying design and improving long-term output accuracy to ±4% over temperature and load.
What package type is used for LM2594HVMX-12/NOPB?
LM2594HVMX-12/NOPB uses an 8-pin SOIC (D) package with nominal body dimensions of 4.90 mm × 3.91 mm. This surface-mount package is RoHS-compliant and pin-compatible with other LM2594xx variants in SOIC-8, enabling drop-in replacement in existing layouts designed for the same footprint.
How does the ON/OFF pin function on LM2594HVMX-12/NOPB?
The ON/OFF pin (pin 5) of LM2594HVMX-12/NOPB provides logic-level shutdown control: pulling it below 1.3 V (typical) enables regulation, while pulling it above 1.3 V disables switching and reduces total input current to 85 μA typical. The pin draws only 5–15 μA, allowing direct interface with 3.3-V or 5-V microcontroller GPIOs without buffering or level shifting.
Can LM2594HVMX-12/NOPB be used in inverting configurations?
Yes, LM2594HVMX-12/NOPB can be configured as a positive-to-negative converter by bootstrapping its ground pin to the negative output, as documented in Figure 8-5 of the datasheet. In this inverting buck-boost topology, it generates −12 V from a +24-V input, subject to the constraint that |VIN| + |VOUT| ≤ 60 V. The ON/OFF pin requires level-shifting circuitry in this configuration.
LM2594HVMX-12/NOPB 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:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2594HVMX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVMX-12/NOPB 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/NOPB reliable?
The price and inventory of LM2594HVMX-12/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594HVMX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVMX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVMX-12/NOPB?
LM2594HVMX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVMX-12/NOPB 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/NOPB?
For technical support, including LM2594HVMX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVMX-12/NOPB requirements.
6.How does Aetrix verify that LM2594HVMX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594HVMX-12/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594HVMX-12/NOPB?
All LM2594HVMX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVMX-12/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM2594HVMX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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