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Texas Instruments LM2594HVN-ADJ/NOPB
- Part No.:
- LM2594HVN-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2594HVN-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:442
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Product details
Overview
LM2594HVN-ADJ/NOPB from Texas Instruments is a nonsynchronous step-down DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers up to 0.5 A output current, supports 4.5 V to 60 V input range, features 150-kHz fixed-frequency operation, ±4% output voltage accuracy over line/load/temperature, and includes thermal shutdown, current limiting, and TTL-compatible ON/OFF control - used in on-card buck regulators and preregulators.
For engineers reviewing the LM2594HVN-ADJ/NOPB datasheet, LM2594HVN-ADJ/NOPB pinout, LM2594HVN-ADJ/NOPB application, or LM2594HVN-ADJ/NOPB equivalent, key selection criteria include HV input capability (60 V max), adjustable output (1.2–37 V), SOIC-8 package compatibility, low 85 μA standby current, and self-protected operation with no external compensation required.
Technical Context
The LM2594HVN-ADJ/NOPB integrates a PWM controller, power switch, oscillator, error amplifier, and protection circuitry in a single monolithic IC. Its internal 150-kHz oscillator drives a nonsynchronous buck topology requiring only four external components: diode, inductor, input capacitor, and feedback resistor divider.
Feedback is sensed at the FB pin referenced to an internal 1.23 V bandgap reference (±4% tolerance). Shutdown is implemented via the ON/OFF pin with 1.3 V threshold, enabling logic-level control and <85 μA quiescent current in standby mode. Thermal shutdown and two-stage current limiting ensure fault robustness without external sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial rails including 24 V, 36 V, and 48 V systems without pre-regulation. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Feedback Reference | 1.23 V ±4% - sets output voltage via external resistor divider; enables 1.2 V to 37 V adjustable range with stable regulation. |
| Switching Frequency | 150 kHz ±15% - fixed internal oscillator simplifies EMI filtering and allows use of standard off-the-shelf inductors. |
| Standby Quiescent Current | 85 μA - enables ultra-low-power shutdown mode suitable for battery-backed or energy-sensitive applications. |
| Saturation Voltage | 1.1 V max at 0.5 A - defines conduction loss in internal NPN switch; impacts efficiency at low VIN/VOUT ratios. |
| Current Limit Threshold | 0.8 A typical peak - provides overcurrent protection during startup or short-circuit conditions without external sensing. |
Pinout & Package
LM2594HVN-ADJ/NOPB is supplied in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and standard surface-mount footprint. Thermal resistance RθJA is 150°C/W on a 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; must be soldered to PCB ground plane for optimal thermal transfer per TI recommendation. |
| 4 | Feedback (FB) | High-impedance input sensing output voltage via resistor divider; bias current ≤50 nA enables high-value resistors. |
| 5 | ON/OFF | TTL-compatible shutdown control; <1.3 V enables regulator, >1.3 V disables it; draws ≤15 μA when active. |
| 6 | Ground | Power and signal reference node; requires low-inductance connection to minimize switching noise coupling. |
| 7 | +VIN | Main power input; requires local 68 μF tantalum or equivalent bypass capacitor to handle pulsed switch currents. |
| 8 | Output | Internal NPN switch collector; swings between (VIN − VSAT) and ≈−0.5 V; minimal copper area recommended to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 150-kHz oscillator | Eliminates need for external timing components and ensures predictable EMI profile across operating conditions. |
| Internal frequency compensation | Enables stable loop response with only four external parts - no external compensation network required. |
| Thermal shutdown + current limit | Provides autonomous fault recovery: reduces switching frequency under overload and halts operation above 150°C junction temperature. |
| Adjustable output (1.2–37 V) | Supports custom rail generation across diverse subsystems using only two external resistors - no requalification needed. |
| TTL shutdown with 85 μA IQ | Allows system-level power sequencing and sleep-mode control while minimizing standby power draw. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Generating 5 V or 3.3 V from a 24 V vehicle battery or factory 48 V bus with high line transients. IC Role / Device Role / Timing Role: Primary step-down regulator providing clean, regulated DC power to MCU, CAN transceivers, and analog sensors. Use Value: Withstands 60 V input surges (ISO 7637-2 Pulse 1/2a/5a), maintains ±4% output accuracy across −40°C to +125°C, and shuts down during cold-crank events below 4.5 V. | Use Scenario: On-board 12 V-to-3.3 V conversion for infotainment head unit logic supply with space-constrained layout. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing linear regulators to improve thermal performance and efficiency. Use Value: Delivers 0.5 A at >80% efficiency (VIN = 12 V), uses only SOIC-8 footprint and standard inductors, and integrates protection to eliminate discrete fuse or reset IC. |
| Programmable Logic Controller (PLC) I/O Module | Test & Measurement Equipment |
Use Scenario: Isolated auxiliary supply generation for digital I/O conditioning circuits in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Pre-regulator feeding low-noise LDOs; handles wide input variation due to field wiring and long cable runs. Use Value: Operates from 18–60 V DC input, maintains regulation during brownouts, and includes undervoltage lockout to prevent erratic behavior during power-up. | Use Scenario: Flexible bench power rail in portable DMM or oscilloscope front-end where multiple output voltages are needed. IC Role / Device Role / Timing Role: Adjustable main supply enabling user-selectable 2.5 V, 3.3 V, or 5 V outputs via front-panel potentiometer. Use Value: 1.2 V to 37 V output range covers common logic and analog rails; 150-kHz switching allows compact filter design without compromising transient response. |
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-ADJ/NOPB | Same architecture and pinout, but rated for 40 V max input (non-HV variant); RθJA = 150°C/W identical. | Limited to ≤40 V input systems; unsuitable for 48 V industrial or automotive transients. | Select LM2594MX-ADJ/NOPB only if input never exceeds 40 V and cost sensitivity outweighs surge margin. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6 A, integrated FETs, 2.1 MHz switching, smaller solution size. | Higher efficiency (>90%), lower EMI, but requires more complex layout and external compensation. | Choose LMR36506RNXR for new designs prioritizing efficiency, size, and modern feature set; LM2594HVN-ADJ/NOPB remains optimal for legacy compatibility and simplicity. |
Compared with LM2594MX-ADJ/NOPB, LM2594HVN-ADJ/NOPB adds 20 V input headroom critical for surge immunity; compared with LMR36506RNXR, it trades higher efficiency and frequency for design simplicity, fewer external parts, and proven reliability in long-lifecycle industrial deployments.
Availability
LM2594HVN-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM2594HVN-ADJ/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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The LM2594HVN-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC-DC converters, engineered specifically for rugged, cost-sensitive power conversion in harsh environments where design simplicity and long-term supply stability are critical.
FAQ
What is the maximum input voltage rating for LM2594HVN-ADJ/NOPB?
The LM2594HVN-ADJ/NOPB has an absolute maximum input voltage rating of 60 V, with recommended operating range from 4.5 V to 60 V. This HV rating distinguishes it from the standard LM2594 (40 V max) and enables use in 48 V industrial buses and automotive load-dump scenarios. The device maintains full functionality and protection features across this entire range, including thermal shutdown activation at 150°C junction temperature.
How does the feedback pin (Pin 4) of LM2594HVN-ADJ/NOPB operate?
The feedback pin (Pin 4) of LM2594HVN-ADJ/NOPB senses the output voltage through an external resistor divider and compares it to an internal 1.23 V reference. Its bias current is ≤50 nA at 25°C, allowing high-value resistors (e.g., 100 kΩ/12.1 kΩ for 12 V output) without significant error. The reference tolerance is ±4% over temperature and load, ensuring output accuracy from 1.2 V to 37 V - verified in TI's electrical characteristics table for the adjustable version.
Can LM2594HVN-ADJ/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2594HVN-ADJ/NOPB supports inverting regulator topologies per TI's Figure 8-5. In this configuration, the GND pin is bootstrapped to the negative output, and the FB pin is grounded, causing the IC to regulate the inverted voltage. The LM2594HVN-ADJ/NOPB's 60 V input rating allows safe operation when |VIN| + |VOUT| ≤ 60 V (e.g., 24 V input to −12 V output). Startup current peaks near 0.8 A, so delayed start-up using the ON/OFF pin is recommended.
What thermal considerations apply to LM2594HVN-ADJ/NOPB in SOIC-8 package?
LM2594HVN-ADJ/NOPB in SOIC-8 (D package) has a junction-to-ambient thermal resistance (RθJA) of 150°C/W on a standard 4-layer JEDEC board. To maintain TJ ≤ 125°C at 0.5 A output, ambient temperature must stay below ~75°C with adequate copper pour on Pin 1/2/3 (NC pins used for thermal conduction). TI recommends soldering these NC pins to ground plane - not leaving them floating - to maximize heat dissipation and avoid exceeding the 150°C absolute maximum junction temperature.
Is LM2594HVN-ADJ/NOPB RoHS-compliant and lead-free?
Yes, LM2594HVN-ADJ/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (TI's designation for lead-free, RoHS-compliant packaging). It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020. The SOIC-8 package uses matte tin lead finish and complies with EU RoHS Directive 2011/65/EU and China RoHS.
LM2594HVN-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 57V
- 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
LM2594HVN-ADJ/NOPB FAQ
1.How can I place an order for LM2594HVN-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVN-ADJ/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 LM2594HVN-ADJ/NOPB reliable?
The price and inventory of LM2594HVN-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594HVN-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594HVN-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVN-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVN-ADJ/NOPB?
LM2594HVN-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVN-ADJ/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 LM2594HVN-ADJ/NOPB?
For technical support, including LM2594HVN-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVN-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2594HVN-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594HVN-ADJ/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 LM2594HVN-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594HVN-ADJ/NOPB?
All LM2594HVN-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVN-ADJ/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 LM2594HVN-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2594HVN-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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