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Texas Instruments LM2594M-12
- Part No.:
- LM2594M-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594M-12.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,710
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Product details
Overview
LM2594M-12 from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator delivering 0.5-A output current with fixed 12-V output, 150-kHz internal oscillator, input voltage range up to 40 V (LM2594), and ±4% output voltage tolerance over line and load. It serves as an efficient on-card power supply in industrial control modules requiring stable mid-power conversion.
For engineers reviewing the LM2594M-12 datasheet, LM2594M-12 pinout, LM2594M-12 application, or LM2594M-12 equivalent, key selection criteria include its SOIC-8 package compatibility, TTL-compatible ON/OFF control, thermal shutdown protection, and minimal external component count (only four required).
Technical Context
The LM2594M-12 integrates a PWM controller, power switch, and internal frequency compensation in a single IC. Its fixed-frequency 150-kHz oscillator enables predictable EMI filtering, while the two-stage current-limit protection and thermal shutdown ensure robust fault handling without external circuitry.
It operates in continuous conduction mode for loads ≥0.1 A and supports discontinuous mode at light loads. The feedback loop uses a precision 1.23-V reference (VFB) to regulate output via external resistor divider - though not needed for fixed 12-V version - and features TTL-level ON/OFF control with 1.3-V threshold and 85-μA standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for analog front-ends and microcontrollers. |
| Max Output Current | 0.5 A DC - sufficient for powering multiple low-power ICs or sensor subsystems from a single converter. |
| Input Voltage Range | 4.5 V to 40 V - supports wide-input industrial supplies including 24-V nominal systems with ripple and dropout margin. |
| Switching Frequency | 150 kHz (±15%) - balances efficiency, inductor size, and EMI filter complexity; avoids AM radio band. |
| Quiescent Current | 10 mA typical - enables low-noise operation in always-on monitoring circuits without excessive idle loss. |
| Standby Current | 85 μA - allows deep-sleep power states in battery-backed or energy-harvested systems. |
| Thermal Protection | Internal overtemperature shutdown - prevents latch-up or damage during sustained overload or poor heatsinking. |
Pinout & Package
LM2594M-12 is supplied in an 8-pin surface-mount SOIC package (D package), body size 4.90 mm × 3.91 mm, with exposed pad not present. Thermal resistance RθJA = 150°C/W on standard JEDEC 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; must be soldered to PCB ground plane for thermal conduction only. |
| 4 | Feedback | Not used in LM2594M-12 (fixed-output); tied internally to 12-V regulation node. |
| 5 | ON/OFF | TTL-compatible shutdown input: <1.3 V = ON, >1.3 V = OFF; enables system-level power sequencing. |
| 6 | Ground | Power and signal reference return; requires low-impedance connection to minimize noise coupling. |
| 7 | +VIN | Main input supply pin; requires local 68-μF tantalum bypass capacitor to suppress switching transients. |
| 8 | Output | Switch node - connects to external catch diode and inductor; high dv/dt demands minimal PCB copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistors - reduces BOM count, layout sensitivity, and calibration drift. |
| 150-kHz fixed oscillator | Enables use of low-cost, high-saturation-current inductors and simplifies EMI compliance testing. |
| TTL shutdown capability | Allows direct interfacing with microcontroller GPIOs without level-shifting circuitry. |
| Thermal + current limiting | Self-protecting operation under short-circuit or overtemperature - no external fault management logic needed. |
| Only four external components | Reduces design cycle time and improves reliability by minimizing passive interconnections and solder joints. |
Applications
| Industrial Sensor Node Power | PLC I/O Module Supply |
|---|---|
Use Scenario: Powers analog signal conditioning, ADC drivers, and isolated RS-485 transceivers in distributed field sensors operating from 24-V DC rails. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, regulated 12-V bias for op-amps and interface ICs. Use Value: Maintains ±4% output accuracy across −40°C to +125°C ambient, ensuring sensor measurement stability without recalibration. | Use Scenario: Supplies auxiliary 12-V rail for digital I/O isolation barriers and LED status indicators in programmable logic controller backplanes. IC Role / Device Role / Timing Role: On-board switching regulator replacing linear regulators to reduce heat generation in confined chassis spaces. Use Value: Delivers 0.5-A at 88% efficiency (VIN = 25 V), cutting thermal load by >60% versus equivalent linear solution. |
| Test Equipment Auxiliary Rail | Legacy Embedded System Upgrade |
Use Scenario: Generates isolated 12-V supply for precision DACs and reference buffers in automated test equipment with tight noise budgets. IC Role / Device Role / Timing Role: Nonsynchronous buck converter with low quiescent current enabling low-noise standby modes between test cycles. Use Value: 85-μA standby current minimizes battery drain in portable calibrators; 150-kHz switching avoids interference with sensitive analog measurements. | Use Scenario: Replaces aging 7812 linear regulators in legacy motor drive control boards where input voltage varies from 18–36 V. IC Role / Device Role / Timing Role: Drop-in upgrade path offering higher efficiency and wider input range without changing PCB footprint. Use Value: SOIC-8 package matches 78xx pinout spacing (with adaptation), enabling mechanical reuse while improving thermal performance and load regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594HVM-12 | Supports 4.5–60 V input (vs. 4.5–40 V); identical 12-V output, SOIC-8 package, pinout, and functional behavior. | Required when input may exceed 40 V (e.g., automotive cold-crank, industrial 48-V systems). | Select LM2594HVM-12 if VIN can reach 60 V; otherwise LM2594M-12 suffices for ≤40 V inputs. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6-A output, 2.1-MHz switching, integrated FETs, smaller solution size. | Offers higher efficiency (>90%), lower EMI, and reduced external component count but requires new layout and control loop tuning. | Choose LMR36506RNXR for new designs prioritizing size/efficiency; LM2594M-12 remains optimal for cost-sensitive, drop-in replacements. |
Compared with LM2594HVM-12, the LM2594M-12 trades input voltage headroom for lower cost and same footprint; compared with LMR36506RNXR, it sacrifices efficiency and integration for proven simplicity and minimal redesign effort.
Availability
LM2594M-12 is available at Aetrix Electronics and suitable for industrial sensor nodes, PLC I/O modules, and test equipment auxiliary rails requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2594M-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 company specializing in analog, embedded processing, and power management technologies, with decades of leadership in power conversion ICs.
The LM2594xx series was designed as a rugged, easy-to-use SIMPLE SWITCHER® solution for cost-sensitive industrial and embedded applications needing reliable 0.5-A step-down conversion with minimal external components.
FAQ
What is the maximum input voltage rating for the LM2594M-12?
The LM2594M-12 has an absolute maximum input voltage of 45 V and a recommended operating maximum of 40 V. Exceeding 40 V risks violating safe operating area limits and may trigger thermal shutdown or reduce long-term reliability. For 60-V input capability, the LM2594HVM-12 variant is specified and pin-compatible.
Does the LM2594M-12 require an external feedback resistor network?
No, the LM2594M-12 does not require external feedback resistors because it is a fixed-output 12-V version. Pin 4 (Feedback) is internally connected to the regulation circuitry and must not be externally biased. External resistors are only needed for the adjustable version (LM2594ADJ).
Can the LM2594M-12 be used in an inverting (positive-to-negative) configuration?
Yes, the LM2594M-12 supports inverting regulator topologies per TI's Figure 8-5. In this mode, the ground pin floats at the negative output voltage, requiring level-shifted ON/OFF control and additional diodes. Maximum |VIN| + |VOUT| must remain ≤40 V to avoid overstressing the internal switch.
What is the thermal resistance (RθJA) of the LM2594M-12 in SOIC-8 package?
The LM2594M-12 in SOIC-8 (D package) has a junction-to-ambient thermal resistance of 150°C/W when mounted on a standard JEDEC 4-layer evaluation board. Actual thermal performance depends on PCB copper area, airflow, and proximity to other heat sources - derating is required above 125°C ambient.
Is the LM2594M-12 RoHS compliant and lead-free?
Yes, the LM2594M-12 is RoHS compliant and lead-free per Texas Instruments' current packaging standards. The SOIC-8 package uses matte tin lead finish, and the device meets JEDEC J-STD-020 moisture sensitivity level 3 requirements for surface-mount assembly.
LM2594M-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 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
LM2594M-12 FAQ
1.How can I place an order for LM2594M-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594M-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 LM2594M-12 reliable?
The price and inventory of LM2594M-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594M-12 is usually 5 days.
3.What payment methods are accepted for LM2594M-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594M-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594M-12?
LM2594M-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594M-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 LM2594M-12?
For technical support, including LM2594M-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594M-12 requirements.
6.How does Aetrix verify that LM2594M-12 is sourced from the original manufacturer or authorized distributors?
All LM2594M-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 LM2594M-12 meets industry standards.
7.What is the process for return or replacement of LM2594M-12?
All LM2594M-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2594M-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 LM2594M-12 part is unused and in its original packaging.
Return procedure for LM2594M-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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