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Texas Instruments LM2594MX-5.0/NOPB
- Part No.:
- LM2594MX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594MX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,466
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Product details
Overview
LM2594MX-5.0/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator delivering 5 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 industrial control modules requiring stable 5-V rail generation from unregulated 12–24-V inputs.
For engineers reviewing the LM2594MX-5.0/NOPB datasheet, LM2594MX-5.0/NOPB pinout, LM2594MX-5.0/NOPB application, or LM2594MX-5.0/NOPB equivalent, key selection criteria include its SOIC-8 package compatibility, TTL-compatible ON/OFF control, 85-μA standby current, thermal shutdown protection, and minimal external component count (only four required).
Technical Context
The LM2594MX-5.0/NOPB integrates a PWM controller, power switch, oscillator, error amplifier, and current-limit circuit in a single die. Its internal frequency compensation eliminates need for external compensation networks, and its two-stage current limiting provides soft-start-like behavior during overload while maintaining regulation under nominal conditions.
It operates in continuous conduction mode across typical loads (0.1–0.5 A) with fixed 150-kHz switching, enabling predictable EMI filtering and consistent inductor sizing. The feedback loop senses output via internal 5-V reference and resistive divider network, ensuring ±4% regulation across −40°C to +125°C ambient and input ranges from 7 V to 40 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full temperature and load range - ensures stable logic rail without external resistor network. |
| Max Output Current | 0.5 A DC - supports microcontroller cores, sensors, and interface ICs in compact embedded systems. |
| Input Voltage Range | 7 V to 40 V - compatible with 12-V and 24-V industrial bus rails, including automotive battery-supplied systems. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, high-saturation-current inductors and simplifies EMI filter design. |
| Quiescent Current | 10 mA typical - maintains regulation during active operation without excessive idle power loss. |
| Standby Current | 85 μA - allows deep sleep modes in battery-backed or energy-sensitive applications. |
| Thermal Shutdown | Active at ~150°C junction - protects device and PCB during sustained overload or poor heatsinking. |
| Efficiency | 82% at VIN = 12 V, IOUT = 0.5 A - reduces thermal load compared to linear regulators in same application. |
Pinout & Package
LM2594MX-5.0/NOPB 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 and no thermal pad requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; must be soldered to PCB ground plane for mechanical stability and thermal relief. |
| 4 | Feedback | Not used in fixed 5-V version - internally tied to reference; leave floating or connect to output per layout guidelines. |
| 5 | ON/OFF | TTL-compatible shutdown input; <1.3 V = ON, >1.3 V = OFF - enables system-level power sequencing and low-power sleep states. |
| 6 | Ground | Main power and signal return path - requires low-impedance connection to minimize noise coupling into feedback path. |
| 7 | +VIN | Primary input supply pin - must be bypassed with ≥68-μF tantalum capacitor close to pin to suppress switching transients. |
| 8 | Output | Internal power switch drain - connects to catch diode anode and inductor; high dv/dt node requiring minimized trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% accuracy across temperature and line. |
| 150-kHz fixed oscillator | Enables predictable EMI signature and consistent inductor selection using standard off-the-shelf 100–150-μH parts rated for ≥0.8-A peak current. |
| TTL shutdown capability | Allows direct interfacing with microcontroller GPIOs or logic supervisors without level-shifting circuitry. |
| Thermal shutdown + current limit | Provides autonomous fault recovery under short-circuit or overtemperature events without external protection components. |
| Only four external components | Requires only input capacitor, output capacitor, inductor, and catch diode - accelerates prototyping and reduces board space vs. controller-based solutions. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 5-V buck regulator converting 24-V DC bus to clean logic supply for microcontrollers and level translators. Use Value: Delivers 0.5-A output with 82% efficiency at 12-V input, minimizing heat buildup in sealed enclosures without forced airflow. | Use Scenario: Generating 5-V rail for CAN transceivers, door lock actuators, and interior lighting controllers in 12-V vehicle architectures. IC Role / Device Role / Timing Role: Nonsynchronous buck converter providing regulated 5-V supply tolerant to cold-crank (6.5-V min) and load-dump (40-V max) transients. Use Value: Withstands 40-V absolute maximum input and features 85-μA standby current, supporting low-quiescent requirements for always-on modules. |
| Medical Point-of-Care Monitor | POS Terminal Power Subsystem |
Use Scenario: Supplying 5-V power to display backlight drivers, touch controller, and USB peripheral ports in portable diagnostic devices. IC Role / Device Role / Timing Role: Compact, thermally robust step-down regulator operating from single-cell Li-ion (3.7 V) boosted to 12 V or from 12-V wall adapter. Use Value: SOIC-8 package fits tight board real estate; thermal shutdown prevents overheating during extended operation in handheld enclosures. | Use Scenario: Providing 5-V rail to thermal printer head, EMV smartcard reader, and secure element in retail payment terminals. IC Role / Device Role / Timing Role: Primary DC-DC converter powering mixed-signal subsystems with strict ripple and transient response requirements. Use Value: Fixed 5-V output eliminates calibration drift from resistor tolerance; ±4% regulation ensures reliable USB enumeration and card communication. |
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-5.0/NOPB | Supports 60-V max input vs. 40 V; identical pinout, package, and electrical specs otherwise. | Suitable for higher-input applications such as 48-V telecom or industrial bus systems where 40-V rating is insufficient. | Select when input may exceed 40 V; otherwise LM2594MX-5.0/NOPB offers cost and thermal advantage at lower VIN. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6-A, 2.1-MHz switching, integrated FETs, smaller solution size. | Replaces LM2594MX-5.0/NOPB in space-constrained or high-efficiency designs requiring >90% efficiency and reduced EMI. | Choose for new designs prioritizing efficiency and footprint; not drop-in due to different pinout, control scheme, and external component needs. |
Compared with LM2594HVMX-5.0/NOPB, the LM2594MX-5.0/NOPB trades input voltage headroom for lower thermal resistance (150°C/W vs. 140°C/W in SOIC) and cost; versus LMR36506RNXR, it offers simpler design and legacy compatibility but lower efficiency and larger solution size.
Availability
LM2594MX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2594MX-5.0/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 LM2594xx family was designed as a robust, easy-to-use SIMPLE SWITCHER® solution for cost-sensitive, medium-power buck applications where simplicity, thermal resilience, and wide input range outweigh ultra-high efficiency or ultra-small footprint requirements.
FAQ
What is the maximum input voltage rating for LM2594MX-5.0/NOPB?
The LM2594MX-5.0/NOPB has an absolute maximum input voltage rating of 45 V and a recommended maximum operating input voltage of 40 V. Exceeding 40 V during normal operation risks violating recommended conditions, though brief transients up to 45 V are tolerated per absolute maximum ratings. This distinguishes it from the LM2594HVMX-5.0/NOPB, which supports up to 60 V.
Does LM2594MX-5.0/NOPB require external feedback resistors?
No, the LM2594MX-5.0/NOPB is a fixed 5-V output variant - its feedback node is internally connected to the 5-V reference, eliminating the need for external resistors. Pin 4 (Feedback) is unused and may be left floating or tied to output per TI layout recommendations; this simplifies design and improves accuracy versus adjustable versions.
Can LM2594MX-5.0/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2594MX-5.0/NOPB can be configured as a positive-to-negative converter generating −5 V, as documented in Figure 8-5 of the datasheet. However, this requires re-referencing the ground pin to the negative output, adding isolation diodes, and adjusting startup sequencing - it is not a drop-in replacement for standard buck use and demands careful layout and transient analysis.
What thermal performance can be expected from LM2594MX-5.0/NOPB in SOIC-8 package?
In its SOIC-8 (D) package, LM2594MX-5.0/NOPB has a junction-to-ambient thermal resistance (RθJA) of 150°C/W on a standard 4-layer JEDEC board. At 0.5-A load and 12-V input, typical power dissipation is ~3.5 W, resulting in ~525°C rise above ambient - thus derating or heatsinking is required for continuous full-load operation above ~50°C ambient.
Is LM2594MX-5.0/NOPB pin-compatible with other LM2594xx variants?
Yes, all LM2594xx variants - including LM2594MX-3.3/NOPB, LM2594MX-12/NOPB, LM2594MX-ADJ/NOPB, and LM2594HVMX-5.0/NOPB - share identical 8-pin SOIC (D) and PDIP (P) packages and pinouts. This allows hardware reuse across output voltage options, provided input voltage and thermal limits are respected for each variant.
LM2594MX-5.0/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):
- 5V
- 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-5.0/NOPB FAQ
1.How can I place an order for LM2594MX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594MX-5.0/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-5.0/NOPB reliable?
The price and inventory of LM2594MX-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594MX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594MX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594MX-5.0/NOPB?
LM2594MX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594MX-5.0/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-5.0/NOPB?
For technical support, including LM2594MX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594MX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2594MX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594MX-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594MX-5.0/NOPB?
All LM2594MX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594MX-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2594MX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2594MX-5.0/NOPB Tags
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