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Texas Instruments LM2594HVMX-3.3
- Part No.:
- LM2594HVMX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594HVMX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,276
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Product details
Overview
LM2594HVMX-3.3 from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter IC designed for high-input-voltage industrial and automotive power rails. It delivers 0.5-A regulated 3.3-V output from input voltages up to 60 V, features 150-kHz fixed-frequency operation, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and current-limit protection. It serves as a primary buck regulator in distributed power systems requiring robust input transient handling.
For engineers reviewing the LM2594HVMX-3.3 datasheet, LM2594HVMX-3.3 pinout, LM2594HVMX-3.3 application, or LM2594HVMX-3.3 equivalent, key selection criteria include HV input capability (60 V max), SOIC-8 package compatibility, TTL-compatible ON/OFF control, 85-μA standby current, and fixed 3.3-V output without external feedback resistors.
Technical Context
The LM2594HVMX-3.3 implements a current-mode controlled buck topology with an internal NPN switch, fixed 150-kHz oscillator, and internal frequency compensation. Its HV rating enables direct regulation from unregulated 48-V telecom or 24-V industrial bus rails without pre-regulation.
It operates in continuous conduction mode (CCM) at full load and transitions to discontinuous conduction mode (DCM) under light loads, with self-protection including two-stage current limiting and thermal shutdown. Feedback is internally trimmed to 3.3 V - no external resistor divider required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over −40°C to +125°C, line, and load - eliminates feedback resistor design and layout sensitivity. |
| Input Voltage Range | 4.5 V to 60 V - supports direct connection to 48-V battery systems and industrial 24–60-V rails without derating. |
| Output Current | 0.5 A DC continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Standby Quiescent Current | 85 μA typical with ON/OFF pin high - enables ultra-low-power sleep modes in battery-backed or energy-harvesting applications. |
| Thermal Protection | Internal thermal shutdown with automatic recovery - prevents latch-up during sustained overload or poor heatsinking conditions. |
| Current Limit | 0.65–1.3 A peak switch current - provides robust short-circuit protection while allowing startup into heavy capacitive loads. |
Pinout & Package
LM2594HVMX-3.3 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 resistance RθJA = 150°C/W 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 conduction. |
| 4 | Feedback | Not used in fixed 3.3-V version - internally connected to output; leave floating or tie to GND per layout best practice. |
| 5 | ON/OFF | TTL-compatible shutdown control: <1.3 V = ON, >1.3 V = OFF; draws only 5–15 μA when active. |
| 6 | Ground | Main power and signal reference; requires low-impedance connection to input/output capacitor ground nodes. |
| 7 | +VIN | High-voltage input supply (up to 60 V); requires local 68-μF tantalum or equivalent low-ESR bypass capacitor. |
| 8 | Output | Switch node - connects to catch diode anode and inductor; high dv/dt requires minimal copper area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V Output | Eliminates external feedback resistors and associated layout sensitivity, reducing BOM count and improving long-term output stability. |
| HV Input Capability | 60-V absolute maximum input enables direct regulation from 48-V telecom, industrial, or automotive battery rails without pre-regulators. |
| TTL Shutdown Interface | Logic-level ON/OFF control allows seamless integration with microcontroller GPIOs or system power sequencers without level-shifting circuitry. |
| Integrated Protection | Thermal shutdown and peak current limiting prevent damage during fault conditions, reducing need for external supervision circuits. |
| Low Standby Power | 85-μA quiescent current in shutdown mode extends battery life in portable or always-on monitoring devices. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Regulating 48-V vehicle battery down to 3.3 V for microcontroller and CAN transceiver power in door modules or seat controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, stable 3.3-V rail with HV input tolerance and thermal resilience in under-hood environments. Use Value: Enables single-stage conversion from 48-V architecture without pre-regulator losses, reducing component count and board space by 30% vs. dual-stage solutions. | Use Scenario: Powering sensor interfaces and logic in programmable logic controller (PLC) backplanes operating from 24–60-V industrial supplies. IC Role / Device Role / Timing Role: Main 3.3-V supply for FPGA configuration, ADC references, and digital isolators in DIN-rail mounted automation hardware. Use Value: Delivers 0.5-A output with ±4% regulation across wide temperature and input variation, ensuring reliable ADC accuracy and logic timing margins. |
| Telecom Remote Radio Unit | Energy Metering System |
Use Scenario: Converting -48-V telecom rectified supply to 3.3 V for RF front-end control logic and memory in remote radio heads. IC Role / Device Role / Timing Role: Buck regulator adapted in inverting configuration to generate positive 3.3 V from negative input rail. Use Value: Supports inverting topology with validated design guidance, enabling reuse of existing -48-V infrastructure without adding isolated DC-DC stages. | Use Scenario: Providing metering SoC and isolation barrier power in smart electricity meters exposed to wide ambient temperatures and grid surges. IC Role / Device Role / Timing Role: Primary 3.3-V regulator with 60-V input rating and thermal shutdown, ensuring uninterrupted operation during AC line transients. Use Value: Maintains regulation during 100-ms 60-V surges common in utility-grade meters, preventing brownouts and data corruption in flash memory writes. |
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 | Standard version with 40-V max input; lower thermal resistance (95°C/W in PDIP) but incompatible with >40-V rails. | Suitable only for 5–40-V inputs; not usable in 48-V telecom or industrial systems. | Select LM2594MX-3.3 only if input never exceeds 40 V and PDIP package is preferred for through-hole assembly. |
| LMR36506RNXR | Synchronous buck with 3–65-V input, 0.6-A output, 2.1-MHz switching, and integrated MOSFETs - higher efficiency and smaller solution size. | Requires different magnetics and layout; lacks HV pinout compatibility and uses different control scheme (current-mode vs. voltage-mode). | Choose LMR36506RNXR for new designs prioritizing efficiency (>90% at 12-V input) and compactness, accepting redesign effort. |
Compared with LM2594HVMX-3.3, LM2594MX-3.3 offers lower cost and wider thermal margin in PDIP but sacrifices HV capability, while LMR36506RNXR delivers superior efficiency and integration at the expense of pinout and control-loop incompatibility - making LM2594HVMX-3.3 optimal for drop-in HV replacement in legacy SOIC-8 layouts.
Availability
LM2594HVMX-3.3 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, telecom infrastructure, and energy metering applications requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for LM2594HVMX-3.3 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 and embedded processing solutions for industrial, automotive, and communications markets.
The LM2594HV product line was engineered for rugged, high-input-voltage DC-DC conversion in harsh environments - targeting applications where reliability, wide VIN range, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for LM2594HVMX-3.3?
The LM2594HVMX-3.3 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 LM2594MX-3.3 (40 V max) and enables direct regulation from 48-V telecom or industrial bus systems. Exceeding 60 V risks permanent damage per Absolute Maximum Ratings table in the TI datasheet SNVS118F.
Does LM2594HVMX-3.3 require external feedback resistors to set its output voltage?
No, LM2594HVMX-3.3 does not require external feedback resistors. It is a fixed-output variant with internal voltage reference trimmed to 3.3 V ±4%, eliminating resistor selection, placement, and tolerance errors. Pin 4 (Feedback) is internally connected to the output and should be left unconnected or tied to ground per TI layout recommendations - unlike the adjustable LM2594HVMX version which requires external resistors.
Can LM2594HVMX-3.3 be used in an inverting (positive-to-negative) configuration?
Yes, LM2594HVMX-3.3 can be configured as a positive-to-negative converter using the inverting topology shown in Figure 8-5 of the datasheet. In this setup, the IC's ground pin floats at the negative output voltage, and the feedback pin is grounded to sense the inverted rail. TI provides validated component values and startup guidance, including use of Schottky diodes and delayed start-up to manage high inrush currents during negative rail establishment.
What is the standby current consumption of LM2594HVMX-3.3 in shutdown mode?
The LM2594HVMX-3.3 draws 85 μA typical standby quiescent current when the ON/OFF pin is pulled above 1.3 V to disable switching. This value is confirmed in Section 7.9 Electrical Characteristics – All Output Voltage Versions of the datasheet, with a maximum of 250 μA over the full −40°C to +125°C temperature range. This ultra-low shutdown current supports battery-powered applications requiring multi-year shelf life.
Which package type is used by LM2594HVMX-3.3, and what are its thermal characteristics?
LM2594HVMX-3.3 is supplied in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size. Its junction-to-ambient thermal resistance (RθJA) is 150°C/W on a standard JEDEC 4-layer board. This value assumes proper PCB copper pour under the exposed pad (pins 1–3 are NC but thermally tied to die substrate), and dictates minimum heatsinking requirements for 0.5-A continuous operation at elevated ambient temperatures.
LM2594HVMX-3.3 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2594HVMX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVMX-3.3 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 reliable?
The price and inventory of LM2594HVMX-3.3 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 is usually 5 days.
3.What payment methods are accepted for LM2594HVMX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVMX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVMX-3.3?
LM2594HVMX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVMX-3.3 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?
For technical support, including LM2594HVMX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVMX-3.3 requirements.
6.How does Aetrix verify that LM2594HVMX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2594HVMX-3.3 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 meets industry standards.
7.What is the process for return or replacement of LM2594HVMX-3.3?
All LM2594HVMX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVMX-3.3, 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 part is unused and in its original packaging.
Return procedure for LM2594HVMX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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