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Texas Instruments LM2594MX-3.3/NOPB
- Part No.:
- LM2594MX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594MX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,553
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Product details
Overview
LM2594MX-3.3/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator delivering 3.3 V at up to 0.5 A, with 150-kHz fixed-frequency operation, ±4% output voltage tolerance over line and load, and input voltage support up to 40 V. It serves as an efficient on-card power supply for microcontroller cores, FPGA I/O banks, and industrial sensors requiring stable low-noise 3.3-V rails.
For engineers reviewing the LM2594MX-3.3/NOPB datasheet, LM2594MX-3.3/NOPB pinout, LM2594MX-3.3/NOPB application, or LM2594MX-3.3/NOPB equivalent, key selection criteria include its SOIC-8 package, TTL-compatible ON/OFF control, 85-μA standby current, thermal shutdown protection, and compatibility with standard off-the-shelf inductors - all critical for cost-sensitive, space-constrained embedded power designs.
Technical Context
The LM2594MX-3.3/NOPB integrates a PWM controller, power switch, oscillator, error amplifier, and thermal/current protection circuitry in a single SOIC-8 package. Its internal 150-kHz oscillator enables predictable EMI filtering and simplifies external component selection, while the fixed 3.3-V output eliminates feedback resistor networks.
It operates in discontinuous or continuous conduction mode depending on load and inductor value, with built-in undervoltage lockout (UVLO) and two-stage current limiting that reduces switching frequency under overload - preventing thermal runaway without external sensing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - ensures reliable logic-level compliance for 3.3-V digital systems. |
| Max Output Current | 0.5 A DC - supports moderate-power MCU, sensor, and interface IC loads without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial, automotive, and telecom supplies with margin for transients. |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, high-saturation-current inductors and simplifies EMI filter design. |
| Quiescent Current | 10 mA typical - balances efficiency at light loads while maintaining fast transient response. |
| Standby Current | 85 μA - allows ultra-low-power shutdown for battery-backed or energy-harvesting applications. |
| Thermal Protection | Internal thermal shutdown - automatically disables switching above 150°C junction temperature, enabling robust operation in sealed enclosures. |
Pinout & Package
LM2594MX-3.3/NOPB is housed in an 8-pin SOIC (D) surface-mount package measuring 4.90 mm × 3.91 mm, optimized for thermal dissipation on standard 4-layer 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 mechanical stability and thermal conduction. |
| 4 | Feedback | Not used in fixed 3.3-V version; internally connected to output divider - leave unconnected per datasheet. |
| 5 | ON/OFF | TTL-compatible shutdown input; ≤1.3 V enables regulation, ≥2 V disables it - enables system-level power sequencing. |
| 6 | Ground | Main power and signal reference; requires low-impedance connection to minimize noise coupling into feedback path. |
| 7 | +VIN | Primary input supply; requires local 68-μF tantalum bypass capacitor to handle high di/dt switching currents. |
| 8 | Output | Internal N-channel switch node; connects to external catch diode and inductor - PCB copper area must be minimized to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% accuracy across temperature. |
| 150-kHz fixed oscillator | Enables predictable EMI spectrum placement and consistent inductor sizing - no external timing components required. |
| TTL shutdown capability | Supports logic-level enable/disable from microcontrollers or PMICs without level-shifting circuitry. |
| Thermal + current limiting | Two-stage current limit reduces frequency under overload, and thermal shutdown prevents damage during sustained fault conditions. |
| SOIC-8 package | Industry-standard footprint compatible with automated assembly and reflow processes; RθJA = 150°C/W enables 0.5-A operation without heatsink at 25°C ambient. |
Applications
| Industrial Sensor Node Power | Microcontroller Core Supply |
|---|---|
Use Scenario: Powering 3.3-V analog front-end sensors and wireless transceivers in remote, unregulated 12–24-V industrial field devices. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3-V rail with low ripple and high PSRR for precision ADCs and RF sections. Use Value: Delivers 0.5-A output with <100-mV peak-to-peak ripple using standard 100-μH inductor and 22-μF output capacitor - eliminating need for LDO post-regulation. | Use Scenario: Supplying core voltage to ARM Cortex-M4/M7 MCUs operating at up to 180 MHz in factory automation controllers. IC Role / Device Role / Timing Role: Main system power converter stepping down 12-V board bus to 3.3-V core rail with fast load-transient response. Use Value: Achieves >80% efficiency at 0.5-A load from 12-V input, reducing thermal load by 30% compared to linear regulators - extending MTBF in enclosed cabinets. |
| FPGA I/O Bank Regulator | POS Terminal Power Management |
Use Scenario: Generating clean 3.3-V supply for FPGA I/O banks interfacing with legacy peripherals in retail kiosks. IC Role / Device Role / Timing Role: Dedicated point-of-load regulator with independent ON/OFF control synchronized to FPGA configuration state. Use Value: TTL-compatible shutdown allows precise power sequencing - disabling I/O banks before configuration and enabling only after DONE pin assertion. | Use Scenario: Powering 3.3-V display, keypad, and contactless reader modules in AC-powered point-of-sale terminals. IC Role / Device Role / Timing Role: Primary DC-DC stage converting rectified 18-V AC adapter output to stable 3.3-V system rail. Use Value: Withstands 40-V input transients common in shared AC outlets, and maintains regulation during brownouts down to 4.5 V - ensuring uninterrupted transaction processing. |
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-3.3/NOPB | Supports 60-V max input vs. 40 V; identical pinout, package, and electrical specs otherwise. | Required for 48-V industrial or PoE-powered systems where input may exceed 40 V. | Select when input voltage exceeds 40 V; otherwise LM2594MX-3.3/NOPB offers lower cost and same performance. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6-A, 2.1-MHz switching, integrated FETs - smaller solution size but higher BOM complexity. | Better suited for compact, high-efficiency designs where PCB area is constrained and 2.1-MHz EMI is manageable. | Choose for new designs prioritizing size/efficiency; LM2594MX-3.3/NOPB remains optimal for legacy layouts, cost-sensitive production, and 150-kHz EMI compliance. |
Compared with LM2594HVMX-3.3/NOPB, the LM2594MX-3.3/NOPB trades 20-V input headroom for lower unit cost and identical thermal performance in 40-V-limited systems; versus LMR36506RNXR, it offers simpler design, lower EMI, and proven reliability in long-lifecycle industrial applications - making it ideal for cost-optimized, volume-manufactured embedded power.
Availability
LM2594MX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, microcontroller-based controllers, and POS terminal power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2594MX-3.3/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 expertise in high-reliability power conversion ICs.
The LM2594xx series was designed specifically for cost-sensitive, medium-power DC-DC applications requiring minimal external components, robust thermal behavior, and drop-in replacement capability for legacy linear regulators in industrial and instrumentation systems.
FAQ
What is the maximum input voltage rating for LM2594MX-3.3/NOPB?
The LM2594MX-3.3/NOPB has a maximum input voltage rating of 40 V, with recommended operating range from 4.5 V to 40 V. This rating is confirmed in Section 7.3 (Recommended Operating Conditions) and Section 7.1 (Absolute Maximum Ratings) of the official TI datasheet SNVS118F. Exceeding 40 V risks permanent damage, and for 48-V or higher inputs, the LM2594HVMX-3.3/NOPB (60-V rated) must be used instead.
Does LM2594MX-3.3/NOPB require external feedback resistors?
No, the LM2594MX-3.3/NOPB does not require external feedback resistors because it is a fixed-output variant with the 3.3-V regulation network integrated internally. Pin 4 (Feedback) is unused and must be left unconnected, as specified in Table 6-1 and Figure 6-1 of the TI datasheet. This eliminates tuning errors and improves production yield compared to adjustable versions.
What is the typical efficiency of LM2594MX-3.3/NOPB at full load?
At 12-V input and 0.5-A output load, the LM2594MX-3.3/NOPB achieves typical efficiency of 80%, as documented in Section 7.5 (Electrical Characteristics – 3.3 V) of the TI datasheet SNVS118F. Efficiency varies with input voltage and load - reaching ~85% at 5-V input and dropping slightly below 75% at 40-V input due to increased switching losses.
Can LM2594MX-3.3/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, the LM2594MX-3.3/NOPB can be configured as a positive-to-negative converter, as demonstrated in Figure 8-5 of the TI datasheet. However, this requires bootstrapping the ground pin to the negative output and adding external diodes (D1, D3). The fixed 3.3-V version produces −3.3 V output, and maximum input+|output| voltage must remain ≤40 V to avoid exceeding absolute maximum ratings.
What thermal derating applies to LM2594MX-3.3/NOPB in SOIC-8 package?
In its SOIC-8 (D) package, the LM2594MX-3.3/NOPB has a junction-to-ambient thermal resistance (RθJA) of 150°C/W on a standard 4-layer JEDEC board. At 25°C ambient, it supports full 0.5-A output continuously; output current must be reduced by ~10 mA per °C above 25°C ambient to maintain Tj ≤150°C, per Section 7.4 Thermal Information in the TI datasheet.
LM2594MX-3.3/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):
- 3.3V
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2594MX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594MX-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2594MX-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594MX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594MX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594MX-3.3/NOPB?
LM2594MX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594MX-3.3/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-3.3/NOPB?
For technical support, including LM2594MX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594MX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2594MX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594MX-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594MX-3.3/NOPB?
All LM2594MX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594MX-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2594MX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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