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Texas Instruments LM2594HVMX-3.3/NOPB
- Part No.:
- LM2594HVMX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594HVMX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,683
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Product details
Overview
LM2594HVMX-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 input voltage support up to 60 V, ±4% output voltage tolerance over line and load, and 150-kHz fixed-frequency operation. It serves as a primary buck regulator in industrial power supplies requiring high-input-voltage resilience and minimal external components.
For engineers reviewing the LM2594HVMX-3.3/NOPB datasheet, LM2594HVMX-3.3/NOPB pinout, LM2594HVMX-3.3/NOPB application, or LM2594HVMX-3.3/NOPB equivalent, key selection criteria include HV input capability (60 V), guaranteed 0.5-A output current, SOIC-8 package compatibility, TTL shutdown functionality, and thermal/current protection integration.
Technical Context
The LM2594HVMX-3.3/NOPB implements a current-mode control architecture with internal frequency compensation and a two-stage current-limiting scheme for robust overload handling. Its oscillator operates at 150 kHz (±15%), enabling predictable EMI filtering and consistent inductor sizing across designs.
It features an integrated NPN switch with 1.1-V typical saturation voltage at 0.5 A, feedback sensing referenced to 1.23 V (±2.7%), and logic-level ON/OFF control with 1.3-V threshold-enabling direct interface with microcontrollers without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - ensures stable logic rail generation without external resistors. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial inputs including 24-V, 48-V, and battery-backed systems. |
| Max Output Current | 0.5 A DC - sufficient for powering microcontrollers, sensors, and analog front-ends in embedded systems. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, standard inductors and simplifies EMI compliance testing. |
| Quiescent Current | 140–250 μA - enables low-power standby modes in always-on applications like remote monitoring nodes. |
| Standby Current | 85 μA typical - reduces system power draw during logic-controlled shutdown without external circuitry. |
| Thermal Protection | Internal overtemperature shutdown - prevents latch-up or damage under sustained overload or poor heatsinking. |
Pinout & Package
LM2594HVMX-3.3/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 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 thermal conduction per TI recommendation. |
| 4 | Feedback | Senses regulated output via internal 1.23-V reference; not used in fixed 3.3-V version but tied internally. |
| 5 | ON/OFF | TTL-compatible enable input: <1.3 V = ON, >1.3 V = OFF; draws only 5–15 μA in either state. |
| 6 | Ground | Main power and signal return path; requires low-impedance connection to minimize noise coupling. |
| 7 | +VIN | Primary input supply pin; requires local 68-μF tantalum bypass capacitor to handle high di/dt switching currents. |
| 8 | Output | Switch node connecting internal NPN transistor collector; drives external catch diode and inductor; layout area must be minimized to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V output | Eliminates external resistor divider, reducing BOM count and improving long-term output stability vs. adjustable variants. |
| 60-V maximum input | Enables direct regulation from unregulated 48-V telecom or industrial bus rails without pre-regulation stage. |
| Integrated current limit & thermal shutdown | Provides self-protection without external sensing components-reduces design risk in harsh environments. |
| 150-kHz fixed oscillator | Ensures predictable filter design and avoids variable-frequency noise spreading that complicates EMI certification. |
| TTL shutdown with 85-μA standby | Allows microcontroller-based power sequencing and ultra-low-power sleep states in battery-powered devices. |
Applications
| Industrial Sensor Node Power | 48-V Telecom Pre-regulator |
|---|---|
Use Scenario: Powering a wireless temperature/humidity sensor with MCU, RF transceiver, and analog signal chain from a 24-V or 48-V field bus. IC Role / Device Role / Timing Role: Primary buck regulator generating clean 3.3-V rail for digital and analog subsystems. Use Value: Delivers 0.5 A at 3.3 V with ±4% accuracy across −40°C to +125°C, ensuring reliable operation in outdoor enclosures. | Use Scenario: Reducing 48-V telecom distribution voltage to 3.3 V for downstream FPGA I/O banks and memory interfaces. IC Role / Device Role / Timing Role: High-input-voltage preregulator preceding low-noise LDOs for sensitive digital loads. Use Value: Withstands 60-V transients and maintains regulation during brownouts, improving system uptime in central office equipment. |
| Ruggedized PLC I/O Module | Automotive Body Control Unit |
Use Scenario: Supplying isolated 3.3-V logic power in programmable logic controller modules exposed to 24-V DC industrial wiring. IC Role / Device Role / Timing Role: Main DC-DC converter providing isolated secondary-side power after transformer-based isolation. Use Value: Built-in thermal shutdown and current limiting prevent fault propagation during short-circuit events on field wiring. | Use Scenario: Generating 3.3-V supply for CAN transceivers and microcontroller peripherals in 12-V/24-V automotive body electronics. IC Role / Device Role / Timing Role: Buck converter operating from battery or alternator-supplied rail with load dump immunity up to 60 V. Use Value: Survives ISO 7637-2 pulse 5a (load dump) without external TVS, reducing component count and board space. |
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 | Lower max input voltage (40 V vs. 60 V); identical pinout, package, and electrical specs otherwise. | Not suitable for 48-V systems or load-dump-prone automotive environments. | Select when input never exceeds 40 V and cost sensitivity outweighs HV margin. |
| LMR36506RNXR | Synchronous buck; 3–65 V input; 0.6 A; 2.1-MHz switching; integrated FETs; smaller solution size. | Requires different layout, inductor, and compensation; higher efficiency but more complex design. | Choose for new designs needing >90% efficiency, compact footprint, or wider VIN range beyond 60 V. |
Compared with LM2594MX-3.3/NOPB, the LM2594HVMX-3.3/NOPB adds 20-V headroom for transient survival; compared with LMR36506RNXR, it trades higher efficiency and frequency for design simplicity, proven reliability, and lower gate-drive complexity in cost-sensitive industrial applications.
Availability
LM2594HVMX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, 48-V telecom pre-regulation, and ruggedized PLC I/O modules requiring stable component supply across extended product lifecycles.
Supply support for LM2594HVMX-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 ICs.
The LM2594HV series was designed specifically for industrial and automotive applications demanding robust 60-V input capability, minimal external components, and long-term manufacturability in cost-sensitive power supply designs.
FAQ
What is the maximum input voltage rating for LM2594HVMX-3.3/NOPB?
The LM2594HVMX-3.3/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 systems and automotive load-dump scenarios. Exceeding 60 V risks permanent damage per Absolute Maximum Ratings table in the datasheet.
Does LM2594HVMX-3.3/NOPB require external feedback resistors?
No, LM2594HVMX-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its 3.3-V regulation is implemented internally using a precision 1.23-V reference and trimmed resistor network. Pin 4 (Feedback) is internally connected and must not be externally modified-doing so may disrupt regulation or damage the device.
What package type is used for LM2594HVMX-3.3/NOPB?
LM2594HVMX-3.3/NOPB uses an 8-pin SOIC (D) package with nominal body dimensions of 4.90 mm × 3.91 mm. It is a surface-mount, gull-wing leaded package compatible with standard reflow processes. The "MX" in the part number explicitly denotes the SOIC-8 variant, distinguishing it from the PDIP-8 ("P") version.
How does the ON/OFF pin function on LM2594HVMX-3.3/NOPB?
The ON/OFF pin (Pin 5) provides TTL-compatible enable control: pulling below 1.3 V (vs. GND) enables the regulator; pulling above 1.3 V disables it. In shutdown, LM2594HVMX-3.3/NOPB draws only 85 μA typical quiescent current. If unused, the pin may be tied directly to GND to ensure always-on operation-no pull-up or pull-down resistors are required.
Is LM2594HVMX-3.3/NOPB RoHS compliant and lead-free?
Yes, LM2594HVMX-3.3/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly indicates lead-free packaging per TI's environmental compliance standards. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for industrial temperature range (−40°C to +125°C).
LM2594HVMX-3.3/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):
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2594HVMX-3.3/NOPB FAQ
1.How can I place an order for LM2594HVMX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVMX-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 LM2594HVMX-3.3/NOPB reliable?
The price and inventory of LM2594HVMX-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 LM2594HVMX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594HVMX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVMX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVMX-3.3/NOPB?
LM2594HVMX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVMX-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 LM2594HVMX-3.3/NOPB?
For technical support, including LM2594HVMX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVMX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2594HVMX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594HVMX-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 LM2594HVMX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594HVMX-3.3/NOPB?
All LM2594HVMX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVMX-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 LM2594HVMX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2594HVMX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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