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Texas Instruments LM2594M-5.0/NOPB
- Part No.:
- LM2594M-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594M-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,531
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Product details
Overview
LM2594M-5.0/NOPB from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter 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 a compact, low-component-count buck regulator in industrial power rails and embedded subsystems.
For engineers reviewing the LM2594M-5.0/NOPB datasheet, LM2594M-5.0/NOPB pinout, LM2594M-5.0/NOPB application, or LM2594M-5.0/NOPB equivalent, key selection criteria include its 8-pin SOIC package, TTL-compatible ON/OFF control, 85 μA standby current, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2594M-5.0/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single IC. Its architecture uses a fixed 150-kHz oscillator with discontinuous conduction mode capability and two-stage current limiting for overload protection.
It operates across −40°C to +125°C junction temperature, supports undervoltage lockout via the ON/OFF pin, and delivers regulated 5 V output with 82% typical efficiency at 12-V input and 0.5-A load - all while requiring only four external components: input capacitor, output capacitor, catch diode, and inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V ±4% over full line/load/temperature range - ensures stable rail for microcontrollers and analog circuitry without feedback resistor network. |
| Max Input Voltage | 40 V - supports wide-input industrial and automotive battery-supplied systems (e.g., 24-V nominal with transients). |
| Output Current | 0.5 A continuous - sufficient for powering small processors, sensors, and interface ICs in space-constrained designs. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, high-saturation-current inductors and simplifies EMI filtering versus higher-frequency alternatives. |
| Standby Current | 85 μA at shutdown - minimizes system-level quiescent power in always-on or battery-backed applications. |
| Thermal Protection | Internal thermal shutdown - prevents damage during sustained overload or poor heatsinking in enclosed enclosures. |
| Current Limit | 0.58–1.4 A peak - provides robust short-circuit protection while allowing safe inrush during cold start. |
Pinout & Package
LM2594M-5.0/NOPB is housed in an 8-pin surface-mount SOIC package (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. Thermal resistance is 150°C/W junction-to-ambient on 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 mechanical stability and thermal relief. |
| 4 | Feedback | Not used in fixed 5-V version; internally tied to output - eliminates need for external resistor divider and reduces BOM count. |
| 5 | ON/OFF | TTL-compatible logic input; <1.3 V = ON, >1.3 V = OFF - enables system-level power sequencing and low-power sleep modes. |
| 6 | Ground | Main power and signal reference; requires low-impedance connection to minimize switching noise coupling into sensitive analog sections. |
| 7 | +VIN | Main input supply; requires local 68-μF tantalum or equivalent low-ESR capacitor to suppress switching transients and sustain peak currents. |
| 8 | Output | Switch node; connects to inductor and catch diode anode - demands minimal copper area to reduce EMI and parasitic ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V Output | Eliminates external feedback resistors - reduces component count, layout complexity, and calibration drift in production. |
| 150-kHz Fixed Oscillator | Enables predictable EMI profile and simplifies filter design using standard off-the-shelf inductors with ≥100-μH rating. |
| TTL Shutdown | Allows direct interfacing with microcontroller GPIOs without level-shifting - supports dynamic power gating in firmware-controlled systems. |
| Thermal & Current Protection | Self-contained fault recovery - avoids need for external monitoring circuits or reset controllers in cost-sensitive industrial modules. |
| Low External Component Count | Only four required parts (input cap, output cap, diode, inductor) - accelerates prototyping and improves long-term supply chain resilience. |
Applications
| Industrial Sensor Node Power | Embedded Microcontroller Rail |
|---|---|
Use Scenario: Powering a 32-bit ARM Cortex-M4 MCU, RS-485 transceiver, and analog sensor front-end from a 24-V field bus with limited board area. IC Role / Device Role / Timing Role: Primary step-down regulator providing clean, regulated 5-V supply to digital and analog subsystems. Use Value: Delivers 0.5-A continuous current with 82% efficiency at 24-V input, reducing heat rise in sealed enclosures and extending uptime between maintenance cycles. | Use Scenario: Generating local 5-V rail for FPGA configuration memory, USB PHY, and real-time clock in a programmable logic controller (PLC) backplane module. IC Role / Device Role / Timing Role: On-card switching regulator replacing linear regulators to improve thermal performance and enable higher integration density. Use Value: Achieves 5-V regulation with ±4% accuracy across −40°C to +85°C ambient, ensuring reliable boot and communication under industrial temperature extremes. |
| Positive-to-Negative Converter | Preregulator for Linear LDO |
Use Scenario: Generating −5-V bias for op-amp dual-rail operation in precision instrumentation using a single 12-V input supply. IC Role / Device Role / Timing Role: Inverting buck-boost topology configured via external diodes and inductor - no change to IC functionality. Use Value: Enables bipolar analog signal conditioning without requiring separate negative supply rails - cuts BOM cost and board space by 30% vs discrete solutions. | Use Scenario: Reducing 24-V industrial input to ~6.5-V intermediate rail before final LDO regulation to 3.3 V for ADC reference and analog circuitry. IC Role / Device Role / Timing Role: Efficient preregulator minimizing power dissipation in downstream linear regulator. Use Value: Limits LDO dropout voltage to <3.2 V, reducing thermal load by >70% compared to direct 24-V-to-3.3-V linear conversion. |
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-5.0/NOPB | Supports 60-V max input (vs. 40 V); otherwise identical pinout, electrical behavior, and package. | Suitable for HV industrial or automotive applications where input transients exceed 40 V. | Select when input voltage may reach 45–60 V; same PCB layout but higher voltage margin. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6-A output, 2.1-MHz switching, integrated FETs, smaller solution size. | Requires different layout, inductor, and compensation; targets ultra-compact, high-efficiency designs. | Choose for new designs needing >90% efficiency, reduced footprint, or extended input range - not drop-in compatible. |
Compared with LM2594M-5.0/NOPB, LM2594HVM-5.0/NOPB offers higher input voltage headroom without layout changes, while LMR36506RNXR delivers superior efficiency and integration at the cost of redesign effort and loss of direct pin compatibility.
Availability
LM2594M-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded control, and sensor interface applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM2594M-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 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, medium-power DC-DC conversion where reliability and minimal external components are critical - especially in industrial and legacy equipment upgrades.
FAQ
What is the maximum input voltage rating for LM2594M-5.0/NOPB?
The LM2594M-5.0/NOPB has a maximum input voltage rating of 40 V, as specified in the Absolute Maximum Ratings table. This limit applies across the full operating temperature range and must not be exceeded to ensure device reliability. The related LM2594HVM-5.0/NOPB variant extends this to 60 V for high-voltage applications.
Does LM2594M-5.0/NOPB require external feedback resistors to set the output voltage?
No, LM2594M-5.0/NOPB does not require external feedback resistors. As a fixed 5-V output version, the feedback network is internal - pin 4 (Feedback) is pre-connected to the output stage. This eliminates tuning components and improves output accuracy and temperature stability versus adjustable variants.
What package type is used for LM2594M-5.0/NOPB, and what are its thermal characteristics?
LM2594M-5.0/NOPB uses an 8-pin SOIC (D package) with nominal body dimensions of 4.90 mm × 3.91 mm. Its junction-to-ambient thermal resistance is 150°C/W on a standard JEDEC 4-layer board. Adequate copper pour on the ground pin (pin 6) is essential to maintain safe operating temperature under 0.5-A load.
Can LM2594M-5.0/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2594M-5.0/NOPB can be configured as a positive-to-negative converter using external diodes and inductor per TI's Figure 8-5. In this topology, it generates −5 V from a positive input, with the ground pin referenced to the negative output. Startup current and voltage stress across the IC must be verified per application conditions.
What is the typical efficiency of LM2594M-5.0/NOPB at rated load?
LM2594M-5.0/NOPB achieves 82% typical efficiency at 12-V input and 0.5-A output load, as measured per the manufacturer's test circuit (Figure 9-13). Efficiency varies with input voltage and load - e.g., 80% at 7-V input and 88% at 24-V input for the 12-V variant - but remains consistently above 75% across its operational range.
LM2594M-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LM2594M-5.0/NOPB FAQ
1.How can I place an order for LM2594M-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594M-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 LM2594M-5.0/NOPB reliable?
The price and inventory of LM2594M-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 LM2594M-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594M-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594M-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594M-5.0/NOPB?
LM2594M-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594M-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 LM2594M-5.0/NOPB?
For technical support, including LM2594M-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594M-5.0/NOPB requirements.
6.How does Aetrix verify that LM2594M-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594M-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 LM2594M-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594M-5.0/NOPB?
All LM2594M-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594M-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 LM2594M-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2594M-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2594M-5.0/NOPB Tags
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TPS562201DDCR
Texas Instruments
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MC34063ABD-TR
STMicroelectronics
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TPS561201DDCR
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MC33063ADR
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MC34063ADR
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TPS560200DBVR
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AP3012KTR-G1
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TLV61048DBVR
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AZ34063UMTR-G1
Diodes Incorporated
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TPS562200DDCR
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AP62300TWU-7
Diodes Incorporated
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MC34063EBD-TR
STMicroelectronics
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