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Texas Instruments LM2594MX-12/NOPB
- Part No.:
- LM2594MX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594MX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,815
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Product details
Overview
LM2594MX-12/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter delivering 12 V fixed output at up to 0.5 A, with 150-kHz fixed-frequency operation, input voltage range up to 40 V, and ±4% output voltage tolerance over line and load. It serves as an efficient on-card switching regulator in industrial power supplies and embedded systems requiring stable mid-power conversion.
For engineers reviewing the LM2594MX-12/NOPB datasheet, LM2594MX-12/NOPB pinout, LM2594MX-12/NOPB application, or LM2594MX-12/NOPB equivalent, key selection criteria include its 0.5-A guaranteed output current, 85-μA standby quiescent current, SOIC-8 surface-mount package, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2594MX-12/NOPB integrates a PWM controller, power switch, oscillator, error amplifier, and current-limit circuit in a single IC. Its internal frequency compensation and fixed 150-kHz oscillator eliminate external timing components, while the ON/OFF pin enables TTL-compatible shutdown with 1.3-V threshold logic control.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads, with self-protection features including two-stage current limiting and thermal shutdown. The feedback loop uses a precision 1.23-V reference to regulate the 12-V output without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - eliminates need for external feedback resistors |
| Max Output Current | 0.5 A DC - ensures stable regulation under sustained mid-power loads |
| Input Voltage Range | 4.5 V to 40 V - supports wide-input industrial and automotive battery-derived rails |
| Switching Frequency | 150 kHz ±15% - enables use of compact, low-cost standard inductors and reduces EMI filtering complexity |
| Standby Quiescent Current | 85 μA typical - minimizes system power draw during sleep or shutdown modes |
| Saturation Voltage | 1.1 V max at 0.5 A - defines minimum dropout and impacts efficiency at low VIN conditions |
| Thermal Shutdown | Activated at 150°C junction temperature - provides fail-safe protection against overheating |
Pinout & Package
LM2594MX-12/NOPB is housed in an 8-pin SOIC (D-package) with 4.90 mm × 3.91 mm body size and surface-mount footprint. Thermal performance is characterized by RθJA = 150°C/W on a 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; must be soldered to PCB ground plane for optimal thermal transfer |
| 4 | Feedback | Input to error amplifier; tied internally to 12-V output - no external resistor network required |
| 5 | ON/OFF | TTL-compatible shutdown control; <1.3 V enables regulation, >1.3 V disables with 85-μA standby current |
| 6 | Ground | Power and signal reference node; requires low-impedance connection to minimize noise and thermal rise |
| 7 | +VIN | Main power input; requires local 68-μF tantalum bypass capacitor to suppress switching transients |
| 8 | Output | Internal power switch collector; connects to external catch diode and inductor - high dv/dt node requiring minimal PCB copper area |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback divider, reducing BOM count and layout sensitivity |
| 150-kHz fixed oscillator | Enables predictable EMI spectrum and simplifies filter design versus variable-frequency alternatives |
| TTL shutdown capability | Allows microcontroller-driven power sequencing without level-shifting circuitry |
| Thermal + current-limit protection | Provides autonomous fault recovery in overload or poor heatsinking conditions |
| SOIC-8 surface-mount package | Supports automated assembly and offers better thermal performance than PDIP for board-level integration |
Applications
| Industrial Power Supply | Embedded System Rail |
|---|---|
Use Scenario: Providing regulated 12-V bias for PLC I/O modules operating from 24-V DC field bus. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24-V supply to stable 12-V rail for analog front-end and digital logic. Use Value: Delivers 0.5-A output with ±4% regulation across −40°C to +125°C ambient, ensuring consistent sensor excitation and ADC reference stability. | Use Scenario: Generating local 12-V supply for motor driver gate drivers in battery-powered robotics. IC Role / Device Role / Timing Role: On-card step-down converter feeding half-bridge gate drivers from a 36-V Li-ion pack. Use Value: 150-kHz switching enables compact 100-μH inductor selection; 85-μA standby current extends runtime during idle states. |
| Preregulator for Linear Regulator | Positive-to-Negative Converter |
Use Scenario: Preconditioning 36-V input to 15-V intermediate rail before LDO regulation to 5-V for MCU core. IC Role / Device Role / Timing Role: Efficient preregulator reducing power dissipation in downstream linear regulator. Use Value: 88% efficiency at 25-V input/0.5-A load cuts heat generation by >60% versus direct LDO drop from 36-V. | Use Scenario: Generating −12-V rail from +24-V supply for op-amp dual-supply circuits in test equipment. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2594MX-12/NOPB's internal switch and external diodes/capacitors. Use Value: Leverages fixed 12-V feedback reference to regulate inverted output; supports up to 200-mA load with standard 100-μH inductor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594HVMX-12/NOPB | Supports 4.5–60 V input (vs. 4.5–40 V); identical pinout, package, and 12-V output spec | Required for 48-V telecom or industrial systems where input may exceed 40 V | Select when VIN can reach 60 V; otherwise LM2594MX-12/NOPB suffices for ≤40-V inputs |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6-A output, 2.1-MHz switching, integrated FETs | Delivers higher efficiency (>90%) and smaller solution size but requires different layout and control loop tuning | Choose for new designs prioritizing efficiency and board space; not drop-in compatible due to different topology and pinout |
Compared with LM2594MX-12/NOPB, the LM2594HVMX-12/NOPB extends input range without changing design effort, while the LMR36506RNXR improves efficiency and density at the cost of increased design complexity and non-interchangeable layout.
Availability
LM2594MX-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rails, and preregulator applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2594MX-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 and embedded processing technologies, with decades of expertise in power management ICs.
The LM2594xx series was designed as a robust, easy-to-use SIMPLE SWITCHER® solution for cost-sensitive, medium-power DC-DC conversion in industrial, automotive, and consumer applications.
FAQ
What is the maximum input voltage rating for LM2594MX-12/NOPB?
The LM2594MX-12/NOPB has an absolute maximum input voltage of 45 V and a recommended operating maximum of 40 V. Exceeding 40 V risks violating recommended conditions and may reduce reliability. For 60-V input capability, TI specifies the LM2594HVMX-12/NOPB variant, which shares the same 12-V output and SOIC-8 package but is rated for higher voltage stress.
Does LM2594MX-12/NOPB require external feedback resistors?
No, LM2594MX-12/NOPB does not require external feedback resistors. It is a fixed-output version with internal resistor divider set for 12 V, and pin 4 (Feedback) is internally connected to the output. This simplifies design, reduces component count, and improves regulation accuracy compared to adjustable variants that rely on external resistor tolerances.
What is the purpose of pins 1, 2, and 3 on LM2594MX-12/NOPB?
Pins 1, 2, and 3 on LM2594MX-12/NOPB are no-connect (NC) terminals with no internal electrical connection. However, TI's datasheet specifies they must be soldered to the PCB ground plane to enhance thermal conduction from the die to the board - critical for maintaining junction temperature within safe limits under 0.5-A load conditions.
Can LM2594MX-12/NOPB be used in an inverting configuration to generate negative voltage?
Yes, LM2594MX-12/NOPB can be configured as a positive-to-negative inverting regulator, as documented in TI's application notes. The fixed 12-V feedback reference enables regulation of the inverted output; for example, a −12-V rail can be generated from +24-V input. External diodes and capacitors are required, and startup current demands are higher than in buck mode - TI recommends adding delayed start-up circuitry.
What thermal resistance value applies to LM2594MX-12/NOPB in SOIC-8 package?
The LM2594MX-12/NOPB in SOIC-8 (D-package) has a junction-to-ambient thermal resistance (RθJA) of 150°C/W when mounted on a standard 4-layer JEDEC test board. This value assumes proper PCB copper pour on the exposed pad (pins 1–3) for thermal relief. Actual thermal performance depends on board layout, copper area, and airflow, and derating is required above 125°C ambient.
LM2594MX-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):
- 40V
- 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
LM2594MX-12/NOPB FAQ
1.How can I place an order for LM2594MX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594MX-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 LM2594MX-12/NOPB reliable?
The price and inventory of LM2594MX-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 LM2594MX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594MX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594MX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594MX-12/NOPB?
LM2594MX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594MX-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 LM2594MX-12/NOPB?
For technical support, including LM2594MX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594MX-12/NOPB requirements.
6.How does Aetrix verify that LM2594MX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594MX-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 LM2594MX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594MX-12/NOPB?
All LM2594MX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594MX-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 LM2594MX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2594MX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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