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Texas Instruments LM2594N-12/NOPB
- Part No.:
- LM2594N-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2594N-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:258
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Product details
Overview
LM2594N-12/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator delivering 12 V at up to 0.5 A, with input voltage range up to 40 V, fixed 150-kHz oscillator, 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 LM2594N-12/NOPB datasheet, LM2594N-12/NOPB pinout, LM2594N-12/NOPB application, or LM2594N-12/NOPB equivalent, key selection criteria include its PDIP-8 package, TTL-compatible ON/OFF control, 85 μA standby current, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2594N-12/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single PDIP-8 package. 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 with <50 nA bias current, enabling stable regulation across −40°C to +125°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for microcontrollers and analog sensors without external resistive divider. |
| Max output current | 0.5 A DC - sufficient to power multiple low-power ICs or small logic boards without heatsinking under typical PCB layout conditions. |
| Input voltage range | 4.5 V to 40 V - supports wide-input industrial supplies including 24 V nominal systems with transient headroom. |
| Switching frequency | 150 kHz ±15% - enables use of low-cost, high-saturation-current toroidal or shielded inductors with minimal EMI filter complexity. |
| Standby quiescent current | 85 μA at 5 V ON/OFF pin - allows battery-backed systems to maintain >1-year shelf life when regulator is disabled. |
| Saturation voltage | 1.1 V max at 0.5 A - limits conduction loss to ≤0.55 W, enabling operation without forced air cooling in enclosed enclosures. |
| Feedback reference | 1.23 V ±0.037 V - provides precise setpoint for external adjustable variants and simplifies error amplifier design in custom configurations. |
Pinout & Package
LM2594N-12/NOPB is supplied in an 8-pin plastic dual in-line package (PDIP), body size 9.81 mm × 6.35 mm, with through-hole mounting and no internal connection on pins 1–3 for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No connection | Thermally conductive pads tied to PCB copper for improved heat transfer; must be soldered but carry no signal. |
| 4 | Feedback | High-impedance input sensing regulated output via resistor divider; bias current <50 nA minimizes divider loading error. |
| 5 | ON/OFF | TTL-compatible shutdown control: <1.3 V = ON, >1.3 V = OFF; draws <15 μA when active, enabling direct MCU GPIO interfacing. |
| 6 | Ground | Power and signal return path; requires low-inductance connection to minimize switching noise coupling into control circuitry. |
| 7 | +VIN | Main power input; requires local 68 μF tantalum bypass capacitor to suppress high di/dt transients during switch transitions. |
| 8 | Output | Internal NPN switch collector; swings between VIN−VSAT and ≈−0.5 V; demands minimal PCB copper area to reduce EMI radiation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while ensuring ±4% accuracy across temperature and load. |
| 150-kHz fixed oscillator | Enables consistent EMI signature and predictable inductor sizing; avoids frequency jitter issues common in variable-frequency converters. |
| TTL shutdown capability | Allows direct interface with 3.3 V or 5 V logic without level-shifting; standby current drops to 85 μA, supporting low-power system sleep modes. |
| Thermal shutdown & current limit | Two-stage protection: first-stage current foldback reduces peak switch current under overload; second-stage thermal cutoff prevents permanent junction damage. |
| Four-component design | Requires only input capacitor, output capacitor, catch diode, and inductor - accelerates prototyping and reduces layout iteration cycles. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit Pre-regulator |
|---|---|
Use Scenario: Powers isolated digital I/O drivers and analog sensor interfaces in DIN-rail mounted programmable logic controllers operating from 24 V DC bus with ±15% ripple. IC Role / Device Role / Timing Role: Primary buck regulator providing clean 12 V rail for optocoupler drivers and ADC reference circuits. Use Value: Delivers 0.5 A at 88% efficiency (VIN = 25 V), minimizing thermal stress in confined enclosures while maintaining ±4% regulation despite bus fluctuations. | Use Scenario: Generates stable 12 V from vehicle battery (9–16 V) to feed downstream LDOs powering microcontroller peripherals and CAN transceivers. IC Role / Device Role / Timing Role: Efficient preregulator stepping down battery voltage before linear regulation, reducing heat dissipation in safety-critical ECUs. Use Value: Withstands cold-crank transients down to 4.5 V input and maintains regulation during load-dump events up to 40 V, eliminating need for external TVS clamping. |
| Point-of-Load Converter for Legacy Instrumentation | Positive-to-Negative Voltage Converter |
Use Scenario: Replaces aging linear regulators in benchtop test equipment where board space is constrained but thermal management is limited. IC Role / Device Role / Timing Role: Compact, through-hole-mounted DC-DC solution delivering 12 V at 0.5 A from 36 V unregulated supply. Use Value: Achieves 88% efficiency versus <40% for equivalent linear regulator, cutting board-level heat by >3 W and enabling fanless operation. | Use Scenario: Generates −12 V rail from +24 V input for op-amp biasing in audio signal conditioning circuits within industrial data acquisition systems. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2594N-12/NOPB with external diodes and modified ground reference. Use Value: Supports up to 200 mA negative output with standard 100 μH inductor; ON/OFF pin retains shutdown control via level-shifted interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594MX-12/NOPB | SOIC-8 surface-mount package; identical electrical specs and pinout except NC pins 1–3 are not bonded. | Preferred for automated assembly and higher-density PCB layouts; thermal resistance RθJA = 150°C/W vs. 95°C/W for PDIP. | Select LM2594MX-12/NOPB when SMT manufacturing is required and thermal margin permits higher junction rise. |
| LM2594HVN-12/NOPB | Extended input range up to 60 V; same PDIP-8 package and pinout; otherwise identical regulation, frequency, and protection features. | Required for 48 V telecom or industrial systems with high transient margins; adds 15% cost premium for HV process. | Choose LM2594HVN-12/NOPB only if input exceeds 40 V; avoid for 24 V systems due to unnecessary voltage rating overhead. |
Compared with LM2594MX-12/NOPB, the LM2594N-12/NOPB offers lower thermal resistance and simpler through-hole rework, while LM2594HVN-12/NOPB extends input capability without altering footprint or control behavior-making both viable alternatives depending on assembly method and input voltage envelope.
Availability
LM2594N-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and legacy instrumentation requiring stable component supply with long-term traceability and no obsolescence risk.
Supply support for LM2594N-12/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 SIMPLE SWITCHER® series was designed for cost-sensitive, medium-power DC-DC applications where ease of use, minimal external components, and robust protection outweigh advanced features like synchronization or current-mode control.
FAQ
What is the maximum input voltage rating for the LM2594N-12/NOPB?
The LM2594N-12/NOPB has an absolute maximum input voltage of 45 V and a recommended maximum operating input voltage of 40 V. Exceeding 40 V risks violating the device's safe operating area, especially under high ambient temperatures or heavy load conditions. The LM2594HVN-12/NOPB variant supports up to 60 V input and should be selected for higher-voltage applications.
Does the LM2594N-12/NOPB require an external feedback resistor network?
No, the LM2594N-12/NOPB is a fixed-output version with internal feedback divider set to 12 V, so no external resistors are needed. Pin 4 (Feedback) is internally connected to the 12 V output node. This simplifies design, eliminates resistor tolerance errors, and improves long-term stability compared to adjustable variants like the LM2594ADJ.
Can the LM2594N-12/NOPB be used in an inverting configuration to generate a negative output voltage?
Yes, the LM2594N-12/NOPB can be configured as a positive-to-negative converter by floating its ground pin and referencing the feedback to the negative output. TI Application Note SNVA229 details this topology, which supports up to −12 V at ~200 mA. Critical considerations include adding external diodes D1 and D3, using a 100 μH inductor, and implementing level-shifted ON/OFF control.
What is the thermal performance of the LM2594N-12/NOPB in its PDIP-8 package?
The LM2594N-12/NOPB in PDIP-8 has a junction-to-ambient thermal resistance (RθJA) of 95°C/W on a standard 4-layer JEDEC board. At 0.5 A output and 24 V input, typical power dissipation is ~0.55 W, resulting in ~52°C junction rise above ambient-well within the 125°C maximum junction temperature. Adequate copper pour on pin 6 (Ground) further improves thermal margin.
Is the LM2594N-12/NOPB RoHS compliant and lead-free?
Yes, the LM2594N-12/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for lead-free reflow soldering profiles up to 260°C peak temperature for 10 seconds.
LM2594N-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2594N-12/NOPB FAQ
1.How can I place an order for LM2594N-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594N-12/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 LM2594N-12/NOPB reliable?
The price and inventory of LM2594N-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594N-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594N-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594N-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594N-12/NOPB?
LM2594N-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594N-12/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 LM2594N-12/NOPB?
For technical support, including LM2594N-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594N-12/NOPB requirements.
6.How does Aetrix verify that LM2594N-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594N-12/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 LM2594N-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594N-12/NOPB?
All LM2594N-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594N-12/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 LM2594N-12/NOPB part is unused and in its original packaging.
Return procedure for LM2594N-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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