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Texas Instruments LM2594HVN-3.3/NOPB
- Part No.:
- LM2594HVN-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2594HVN-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
LM2594HVN-3.3/NOPB from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter delivering 3.3 V at up to 0.5 A with ±4% output voltage tolerance, 150-kHz fixed-frequency operation, and input voltage support up to 60 V. It integrates internal frequency compensation and thermal/current protection, and is used in industrial power supplies requiring robust 3.3-V rail generation from wide-input sources.
For engineers reviewing the LM2594HVN-3.3/NOPB datasheet, LM2594HVN-3.3/NOPB pinout, LM2594HVN-3.3/NOPB application, or LM2594HVN-3.3/NOPB equivalent, key selection considerations include HV input capability (60 V), TTL-compatible ON/OFF control, 85-μA standby current, SOIC-8 package compatibility, and fixed 3.3-V output without external feedback resistors.
Technical Context
The LM2594HVN-3.3/NOPB implements a current-mode controlled buck topology with an integrated 0.5-A NPN switch and fixed 150-kHz oscillator. Its feedback loop senses output voltage directly via internal 3.3-V reference, eliminating external resistor dividers. The device operates in continuous conduction mode under typical loads but supports discontinuous mode at light loads.
Protection architecture includes two-stage current limiting (peak limit ~0.8 A, foldback reduction under overload) and thermal shutdown at 150°C junction temperature. Standby mode reduces quiescent current to 85 μA when the ON/OFF pin is pulled above 1.3 V, enabling low-power system control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over line, load, and temperature - ensures stable logic supply without trimming. |
| Max Input Voltage | 60 V - supports industrial 48-V bus, automotive cold-crank, and unregulated AC/DC outputs. |
| Output Current | 0.5 A DC - sufficient for microcontroller cores, FPGAs, and sensor interfaces with margin. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Quiescent Current | 140–250 μA - minimizes no-load power loss in battery-backed or always-on systems. |
| Standby Current | 85 μA - allows deep-sleep control via logic-level ON/OFF pin without external circuitry. |
| Thermal Resistance | 150°C/W (SOIC-8) - requires minimal copper area for thermal relief in standard PCB layouts. |
Pinout & Package
LM2594HVN-3.3/NOPB is supplied in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and standard 1.27-mm pitch. Thermal performance is optimized with exposed pad soldered to PCB ground plane for enhanced heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; must be soldered to PCB ground for thermal conduction only. |
| 4 | Feedback | Not used in fixed 3.3-V version - internally tied to reference; leave floating or grounded per layout best practice. |
| 5 | ON/OFF | TTL-compatible shutdown control: <1.3 V = ON, >1.3 V = OFF; draws ≤15 μA in either state. |
| 6 | Ground | Power and signal return path; connects to thermal pad for junction-to-board heat transfer. |
| 7 | +VIN | Main input supply (4.5–60 V); requires local 68-μF tantalum or low-ESR ceramic bypass capacitor. |
| 8 | Output | Switch node - drives external catch diode and inductor; high dv/dt requires minimized trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V Output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while ensuring ±4% regulation across −40°C to +125°C. |
| High-Voltage Input Support | 60-V absolute maximum rating enables direct connection to 48-V industrial buses or unregulated rectified inputs without pre-regulation. |
| Integrated Protection | Thermal shutdown and two-stage current limiting prevent damage during short-circuit or overload, allowing safe operation without external sensing. |
| Low Standby Power | 85-μA shutdown current permits integration into energy-sensitive applications such as remote sensors or battery-powered gateways. |
| Simple External Design | Requires only four components - input capacitor, output capacitor, inductor, and catch diode - accelerating design cycle and reducing footprint. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Generating isolated 3.3-V logic supply for digital I/O expansion cards operating from 24-V or 48-V field bus. IC Role / Device Role / Timing Role: Primary step-down regulator providing regulated 3.3-V rail for microcontrollers, level shifters, and optocouplers. Use Value: 60-V input rating accommodates bus transients; ±4% output tolerance ensures reliable MCU boot and peripheral operation. | Use Scenario: Powering CAN transceiver and microcontroller subsystems in body control modules fed from 12-V battery with cold-crank down to 6 V. IC Role / Device Role / Timing Role: Main 3.3-V supply for low-power domain, enabled/disabled via vehicle wake-up signals. Use Value: 85-μA standby current extends battery life during sleep; 150-kHz switching avoids AM radio band interference. |
| Medical Point-of-Care Device | Telecom Remote Radio Unit |
Use Scenario: Providing clean 3.3-V rail for ADCs, touch controllers, and wireless SoCs in portable diagnostic equipment powered by 24-V wall adapter. IC Role / Device Role / Timing Role: High-efficiency buck converter replacing linear regulators to minimize thermal dissipation in sealed enclosures. Use Value: 80% efficiency at 0.5-A load reduces heat buildup; SOIC-8 package fits compact multilayer PCBs with thermal relief. | Use Scenario: Converting 48-V PoE++ or telecom -48-V (with inverting configuration) to 3.3-V for FPGA configuration and monitoring ICs. IC Role / Device Role / Timing Role: Fixed-output buck regulator in distributed power architecture, supporting hot-swap and remote enable. Use Value: ON/OFF pin enables centralized power sequencing; 60-V rating supports reverse-polarity protection circuits. |
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-3.3/NOPB | Same electrical specs but in PDIP-8 package; higher RθJA (95°C/W vs. 150°C/W), no thermal pad. | Suitable for prototyping or through-hole assembly; less suitable for high-ambient or high-power-density designs. | Select LM2594MX-3.3/NOPB only when manual soldering or socket-based testing is required. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6 A, 2.1-MHz switching, 92% efficiency, 1.5-mm QFN. | Enables smaller solution size and higher efficiency but requires more complex layout and external compensation. | Choose LMR36506RNXR for new designs prioritizing size, efficiency, and modern topology - not drop-in replacement. |
Compared with LM2594HVN-3.3/NOPB, LM2594MX-3.3/NOPB offers identical regulation but inferior thermal performance in PDIP, while LMR36506RNXR delivers higher efficiency and frequency at the cost of increased design complexity and non-pin-compatibility.
Availability
LM2594HVN-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LM2594HVN-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 experience in high-reliability power conversion solutions.
The LM2594HV product line was designed for rugged, wide-input-voltage DC-DC conversion in industrial, telecom, and transportation systems where input transients, extended temperature range, and long-term stability are critical.
FAQ
What is the maximum input voltage rating for LM2594HVN-3.3/NOPB?
The LM2594HVN-3.3/NOPB has an absolute maximum input voltage rating of 60 V, making it suitable for 48-V industrial buses and automotive applications with cold-crank conditions. Its recommended operating range is 4.5 V to 60 V, and exceeding 60 V risks permanent damage per the Absolute Maximum Ratings table in the datasheet.
Does LM2594HVN-3.3/NOPB require external feedback resistors?
No, LM2594HVN-3.3/NOPB does not require external feedback resistors because it integrates a precision 3.3-V reference and internal resistor divider. Pin 4 (Feedback) is internally connected and should be left floating or grounded per TI layout guidelines - unlike the adjustable version, no external components set the output voltage.
How does the ON/OFF pin function on LM2594HVN-3.3/NOPB?
The ON/OFF pin (Pin 5) provides TTL-compatible shutdown: pulling it below 1.3 V enables regulation, while pulling it above 1.3 V disables switching and reduces total input current to 85 μA. The pin accepts voltages up to 25 V and draws ≤15 μA, enabling direct interface with microcontrollers or logic gates without level-shifting circuitry.
What package type is used for LM2594HVN-3.3/NOPB?
LM2594HVN-3.3/NOPB uses an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and 1.27-mm lead pitch. It features an exposed thermal pad that must be soldered to a PCB ground plane to achieve the specified 150°C/W junction-to-ambient thermal resistance.
Can LM2594HVN-3.3/NOPB be used in inverting configurations?
Yes, LM2594HVN-3.3/NOPB can be configured as a positive-to-negative converter by bootstrapping its ground pin to the negative output, as documented in Figure 8-5 of the datasheet. However, this requires additional diodes and modified ON/OFF control, and the maximum input+|output| voltage must remain ≤60 V to stay within the device's absolute maximum rating.
LM2594HVN-3.3/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):
- 60V
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2594HVN-3.3/NOPB FAQ
1.How can I place an order for LM2594HVN-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVN-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 LM2594HVN-3.3/NOPB reliable?
The price and inventory of LM2594HVN-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 LM2594HVN-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594HVN-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVN-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVN-3.3/NOPB?
LM2594HVN-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVN-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 LM2594HVN-3.3/NOPB?
For technical support, including LM2594HVN-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVN-3.3/NOPB requirements.
6.How does Aetrix verify that LM2594HVN-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594HVN-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 LM2594HVN-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594HVN-3.3/NOPB?
All LM2594HVN-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVN-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 LM2594HVN-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2594HVN-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2594HVN-3.3/NOPB Tags
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