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Texas Instruments LM2594MX-ADJ
- Part No.:
- LM2594MX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594MX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,492
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Product details
Overview
LM2594MX-ADJ from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator IC delivering up to 0.5 A output current, operating from 4.5 V to 40 V input, with adjustable output voltage range of 1.2 V to 37 V (±4% tolerance), and fixed 150-kHz internal oscillator frequency - used in industrial power supplies and embedded system point-of-load conversion.
For engineers reviewing the LM2594MX-ADJ datasheet, LM2594MX-ADJ pinout, LM2594MX-ADJ application, or LM2594MX-ADJ equivalent, key selection criteria include input voltage headroom, feedback bias current (≤50 nA), thermal resistance (150 °C/W in SOIC), ON/OFF logic threshold (1.3 V), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2594MX-ADJ integrates a PWM controller, power switch, oscillator, error amplifier, and thermal/current protection circuitry in a single SOIC-8 package. It operates in continuous or discontinuous conduction mode, with internal frequency compensation and fixed-frequency operation at 150 kHz (±15%).
Feedback is implemented via a resistive divider connected to the FB pin, referenced to a precise 1.23 V internal bandgap (1.18–1.28 V over temperature). Shutdown is TTL-compatible: pulling the ON/OFF pin above 1.3 V disables switching, reducing quiescent current to 85 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 0.5 A DC maximum - supports mid-power loads without external current boosting. |
| Input voltage range | 4.5 V to 40 V - accommodates 5 V, 12 V, 24 V, and 36 V industrial rails. |
| Output voltage range | 1.2 V to 37 V (adjustable) - set by external resistor divider; enables flexible rail generation. |
| Feedback reference voltage | 1.23 V (±0.05 V typical) - determines output accuracy and stability margin for divider design. |
| Switching frequency | 150 kHz (110–173 kHz over temp) - balances EMI, inductor size, and efficiency for cost-sensitive designs. |
| Standby quiescent current | 85 μA - enables low-power sleep modes in battery-backed or always-on systems. |
| Saturation voltage | 1.1 V max at 0.5 A - impacts conduction loss and minimum dropout under load. |
| Thermal resistance (θJA) | 150 °C/W (SOIC-8) - defines power dissipation limit before thermal shutdown (150 °C junction). |
Pinout & Package
LM2594MX-ADJ is supplied in an 8-pin surface-mount SOIC package (4.90 mm × 3.91 mm body size), optimized for thermal performance on standard PCBs with exposed pad grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | NC | No internal connection; must be soldered to PCB ground plane for thermal conduction. |
| 4 | Feedback (FB) | High-impedance input sensing output voltage via resistor divider; 50 nA bias current affects high-R divider accuracy. |
| 5 | ON/OFF | TTL-compatible shutdown control; 1.3 V threshold enables direct microcontroller GPIO interfacing without level shifters. |
| 6 | Ground | Main power and signal reference; requires low-inductance connection to minimize switching noise coupling. |
| 7 | +VIN | Positive input supply; requires local 68 μF tantalum or equivalent low-ESR capacitor for transient current sourcing. |
| 8 | Output | Internal NPN switch collector; switches between VIN−VSAT and ≈−0.5 V; demands minimal copper area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency 150-kHz oscillator | Enables predictable EMI filtering and consistent inductor sizing across production batches. |
| Internal thermal and current limiting | Two-stage current limit + overtemperature shutdown prevent damage during overload or poor heatsinking. |
| Low 85-μA standby current | Supports energy-efficient system-level power sequencing and deep-sleep states. |
| Only four external components required | Reduces BOM count and layout complexity: diode, inductor, input cap, output cap - no compensation network needed. |
| ±4% output voltage tolerance | Guaranteed accuracy over full line/load/temperature range eliminates need for post-production trimming. |
| SOIC-8 and PDIP-8 packaging | Enables drop-in replacement between through-hole prototyping and surface-mount volume production. |
Applications
| Industrial Power Supply | Embedded System Point-of-Load |
|---|---|
|
Use Scenario: Converting 24 V factory bus to 3.3 V or 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC rails with high line regulation (±0.2%) and 0.5-A capability. Use Value: Eliminates need for linear regulators in high-input-voltage environments, reducing heat sink requirements and board space. |
Use Scenario: Generating stable 1.8 V or 2.5 V core voltage for microcontrollers in remote telemetry units. IC Role / Device Role / Timing Role: Adjustable-output switching regulator configured with precision resistor divider for tight output tolerance. Use Value: Achieves >80% efficiency at 0.3-A load, extending battery life while maintaining ±4% output accuracy across −40°C to +125°C. |
| On-Card Pre-Regulator | Positive-to-Negative Converter |
|
Use Scenario: Stepping down 12 V or 15 V intermediate rail to 5 V before feeding low-noise LDOs for analog subsystems. IC Role / Device Role / Timing Role: Efficient preregulator minimizing power loss upstream of sensitive analog circuitry. Use Value: Reduces thermal load on downstream LDOs by lowering input-to-output differential, improving overall system efficiency. |
Use Scenario: Generating −5 V or −12 V from +12 V or +24 V supply for op-amp biasing or RS-232 transceivers. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2594MX-ADJ with bootstrapped ground and external diodes. Use Value: Enables dual-rail analog circuits without requiring dedicated negative supply ICs or transformers. |
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-ADJ | Wider 4.5–60 V input range; higher absolute max VIN (60 V vs. 40 V); same pinout and FB reference. | Required for 48 V telecom or automotive battery-supplied systems where transient spikes exceed 40 V. | Select when input can exceed 40 V; otherwise LM2594MX-ADJ offers lower cost and identical functionality. |
| LMR36506RNXR | Synchronous buck; 3–65 V input; 0.6 A; 2.1 MHz switching; integrated FETs; 95% peak efficiency. | Delivers smaller solution size, higher efficiency, and lower EMI - but requires more complex layout and external compensation. | Choose for new designs prioritizing size/efficiency; LM2594MX-ADJ remains optimal for legacy cost-sensitive or thermally constrained layouts. |
Compared with LM2594HVMX-ADJ, the LM2594MX-ADJ trades input voltage headroom for lower cost and proven thermal behavior in SOIC-8; versus LMR36506RNXR, it sacrifices efficiency and frequency for simplicity, BOM reduction, and ease of qualification in industrial applications.
Availability
LM2594MX-ADJ is available at Aetrix Electronics and suitable for industrial automation, embedded power management, and on-card DC-DC conversion requiring stable component supply and long-term lifecycle support.
Supply support for LM2594MX-ADJ 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 ICs, with decades of expertise in reliable, high-volume power conversion solutions.
The LM2594MX-ADJ belongs to TI's SIMPLE SWITCHER® family - designed specifically for robust, easy-to-implement DC-DC conversion in cost-sensitive industrial and commercial applications where reliability and design simplicity are critical.
FAQ
What is the maximum input voltage rating for LM2594MX-ADJ?
The LM2594MX-ADJ has a maximum recommended input voltage of 40 V under normal operating conditions. Its absolute maximum rating is 45 V, but sustained operation above 40 V risks reduced reliability and thermal stress. For 60-V applications, the pin-compatible LM2594HVMX-ADJ variant must be used instead of LM2594MX-ADJ.
How does the feedback pin (FB) of LM2594MX-ADJ function in adjustable-output configurations?
The FB pin of LM2594MX-ADJ senses the divided output voltage and compares it to an internal 1.23-V reference. With ≤50 nA bias current, it enables high-resistance resistor dividers (e.g., 10 kΩ/10 kΩ for 2.46 V output) without significant error. The LM2594MX-ADJ regulates output so that VFB = 1.23 V, making VOUT = 1.23 × (1 + R1/R2).
Can LM2594MX-ADJ be used in inverting (positive-to-negative) converter topologies?
Yes - LM2594MX-ADJ supports inverting buck-boost configurations by bootstrapping its ground pin to the negative output rail and referencing the FB pin to ground. This configuration requires two external diodes and careful attention to startup current limits; the LM2594MX-ADJ datasheet provides validated schematics and inductor guidance for −5 V and −12 V outputs.
What thermal considerations apply to LM2594MX-ADJ in SOIC-8 package?
The LM2594MX-ADJ in SOIC-8 has a junction-to-ambient thermal resistance (θJA) of 150 °C/W. To maintain safe operation below 150 °C junction temperature, power dissipation must stay below ~333 mW at 25 °C ambient. This requires adequate copper pour on pins 1–3 (NC) and pin 6 (GND), plus airflow or heatsinking for loads near 0.5 A at high VIN/VOUT differentials.
Is LM2594MX-ADJ RoHS-compliant and lead-free?
Yes - LM2594MX-ADJ is manufactured in accordance with RoHS Directive 2011/65/EU and is lead-free, halogen-free, and compliant with TI's environmental standards. The SOIC-8 package uses matte tin lead finish, and full compliance documentation is available in TI's official product change notifications and material declarations for LM2594MX-ADJ.
LM2594MX-ADJ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- 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-ADJ FAQ
1.How can I place an order for LM2594MX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594MX-ADJ 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-ADJ reliable?
The price and inventory of LM2594MX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594MX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2594MX-ADJ?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594MX-ADJ?
LM2594MX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594MX-ADJ 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-ADJ?
For technical support, including LM2594MX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594MX-ADJ requirements.
6.How does Aetrix verify that LM2594MX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2594MX-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM2594MX-ADJ?
All LM2594MX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2594MX-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM2594MX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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