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Texas Instruments LM2594HVN-3.3
- Part No.:
- LM2594HVN-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2594HVN-3.3.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
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Product details
Overview
LM2594HVN-3.3 from Texas Instruments is a nonsynchronous step-down DC-DC converter IC delivering 3.3 V at up to 0.5 A, with input voltage support up to 60 V, ±4% output voltage tolerance, and 150-kHz fixed-frequency operation - used in industrial power rails, embedded system preregulation, and on-board buck conversion.
For engineers reviewing the LM2594HVN-3.3 datasheet, LM2594HVN-3.3 pinout, LM2594HVN-3.3 application, or LM2594HVN-3.3 equivalent, key selection criteria include HV input capability (60 V), thermal shutdown protection, TTL-compatible ON/OFF control, and SOIC-8 surface-mount package compatibility with standard PCB layout practices.
Technical Context
The LM2594HVN-3.3 integrates a PWM controller, power switch, oscillator, and internal frequency compensation in a monolithic buck topology. It operates in discontinuous or continuous conduction mode depending on load and inductor selection, with self-protection via two-stage current limiting and thermal shutdown.
Its feedback loop senses output voltage through an internal 1.23-V reference and external resistor divider (not required for fixed 3.3-V version), while the ON/OFF pin enables logic-level shutdown with 85-μA standby current and 1.3-V threshold - supporting delayed start-up and undervoltage lockout circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over line, load, and temperature - ensures stable microcontroller I/O rail without external adjustment. |
| Max Input Voltage | 60 V - supports wide-input industrial, automotive, and telecom power buses without external pre-regulation. |
| Output Current | 0.5 A DC - sufficient for powering multiple low-power peripherals or single-core MCUs 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 (TJ = 25°C to 125°C) - minimizes standby power in battery-backed or energy-sensitive systems. |
| Standby Current | 85 μA typical - allows deep-sleep operation when ON/OFF pin is pulled high, preserving system battery life. |
| Thermal Protection | Internal thermal shutdown - prevents damage during overload or poor heatsinking; auto-recovery on cooldown. |
| Current Limit | 0.58–1.4 A peak - provides robust short-circuit protection while allowing safe inrush during startup. |
Pinout & Package
LM2594HVN-3.3 is housed in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and standard surface-mount footprint.
| 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 | Not used in fixed 3.3-V version; tied internally to reference - leave floating or connect to output per layout guidelines. |
| 5 | ON/OFF | Logic-controlled enable: <1.3 V = ON, >1.3 V = OFF; supports TTL/CMOS interface and external UVLO/delay circuits. |
| 6 | Ground | Main power and signal return path; requires low-impedance connection to minimize noise and thermal resistance. |
| 7 | +VIN | Primary input supply (4.5–60 V); requires local 68-μF tantalum bypass capacitor to suppress switching transients. |
| 8 | Output | Switch node - connects to external catch diode and inductor; high dv/dt demands minimal copper area to reduce EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V Output | Eliminates external feedback resistors - reduces BOM count and layout sensitivity for dedicated 3.3-V rail generation. |
| High-Voltage Input Support | 60-V max rating enables direct connection to 48-V industrial buses or unregulated AC/DC outputs without pre-regulator stage. |
| TTL-Compatible Enable | 1.3-V logic threshold allows direct interfacing with microcontrollers and FPGAs without level-shifting circuitry. |
| Integrated Thermal Shutdown | Automatic fault recovery protects against sustained overload or inadequate heatsinking in enclosed enclosures. |
| Low Standby Power | 85-μA shutdown current extends battery runtime in portable or remote sensor applications requiring periodic wake-up. |
| Self-Compensated Architecture | Requires only four external components (inductor, diode, input/output caps) - accelerates design cycle and improves production yield. |
Applications
| Industrial Sensor Node Power | Embedded MCU Preregulator |
|---|---|
Use Scenario: Powering 3.3-V microcontrollers, RS-485 transceivers, and analog front-ends in factory-floor sensors exposed to 24–48-V DC bus fluctuations. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 48-V field power to clean, regulated 3.3-V supply with line regulation ≤±0.5%. Use Value: Eliminates need for discrete linear preregulator + LDO cascade, reducing heat dissipation by >75% versus linear solution at 0.3-A load. | Use Scenario: Generating stable 3.3-V rail for ARM Cortex-M4-based edge controllers operating from wide-input 12–36-V vehicle or PoE-derived supplies. IC Role / Device Role / Timing Role: Nonsynchronous buck converter providing efficient, low-noise core voltage with built-in thermal foldback during extended ambient temperature excursions. Use Value: Delivers 80% efficiency at 12-V input/0.5-A load - cuts board-level power loss by 1.2 W compared to 7805-based solution. |
| On-Card Distributed Power | Positive-to-Negative Converter |
Use Scenario: Local 3.3-V supply on high-density PCBs where centralized 5-V rail is shared across multiple subsystems with varying load dynamics. IC Role / Device Role / Timing Role: Point-of-load (POL) buck regulator minimizing IR drop and noise coupling via localized input/output capacitors and compact inductor placement. Use Value: Achieves <10-mV p-p output ripple with 22-μF tantalum output cap - meets tight noise budget for ADC reference and PLL clocking circuits. | Use Scenario: Generating −5-V bias for op-amp dual-supply stages or analog comparators in instrumentation systems using only a single positive input source. IC Role / Device Role / Timing Role: Inverting buck-boost topology configured via external diodes and feedback grounding - leverages same IC die as buck mode with modified pin connections. Use Value: Enables bipolar analog signal conditioning without dedicated inverting IC; maintains ±4% output accuracy across −5-V load range up to 150 mA. |
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 | Same architecture and pinout, but rated for 40-V max input (non-HV variant); lower thermal resistance (150°C/W vs 95°C/W in SOIC). | Suitable for 5–36-V input systems only; not recommended for 48-V industrial or telecom applications. | Select LM2594MX-3.3 only if input never exceeds 40 V and thermal margin is acceptable under full load. |
| LMR36506RNXR | Synchronous buck with 3–65-V input, 0.6-A output, integrated high/low-side FETs, and 2.1-MHz switching - smaller solution size, higher efficiency (92% vs 80%), no external diode required. | Requires redesign of inductor, compensation, and layout; not pin-compatible; supports tighter output voltage tolerance (±1%). | Choose LMR36506RNXR for new designs prioritizing efficiency, size, and modern feature set - not for drop-in replacement. |
Compared with LM2594HVN-3.3, LM2594MX-3.3 offers identical functionality at lower cost but lacks HV input capability, while LMR36506RNXR delivers superior performance and integration at the expense of redesign effort and non-interchangeable packaging.
Availability
LM2594HVN-3.3 is available at Aetrix Electronics and suitable for industrial automation, embedded control, and distributed power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LM2594HVN-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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in reliable, high-performance power conversion ICs.
The LM2594HV product line was designed specifically for rugged, wide-input-voltage DC-DC conversion in industrial, telecom, and transportation systems where input transients and extended voltage ranges are common.
FAQ
What is the maximum input voltage rating for the LM2594HVN-3.3?
The LM2594HVN-3.3 supports a maximum input voltage of 60 V, as confirmed in the Absolute Maximum Ratings table and Recommended Operating Conditions section of the official datasheet. This HV rating distinguishes it from the standard LM2594 (40 V max) and enables direct use with 48-V industrial buses or unregulated AC/DC outputs. Exceeding 60 V risks permanent device damage.
Does the LM2594HVN-3.3 require external feedback resistors to set its output voltage?
No, the LM2594HVN-3.3 does not require external feedback resistors because it is a fixed-output variant with internal resistor divider network calibrated to 3.3 V ±4%. Pin 4 (Feedback) is internally connected and may be left unconnected or tied to output per TI layout recommendations - unlike the adjustable LM2594HV-ADJ version which requires external resistors.
Can the LM2594HVN-3.3 be used in an inverting (positive-to-negative) configuration?
Yes, the LM2594HVN-3.3 can be configured as a positive-to-negative converter by bootstrapping its ground pin to the negative output and grounding the feedback pin - as documented in Figure 8-5 of the datasheet. This topology supports −3.3-V output with appropriate external diodes and inductor selection, though maximum output current depends on input/output voltage ratio and thermal limits.
What is the typical quiescent current of the LM2594HVN-3.3 in normal operation and shutdown mode?
In normal operation, the LM2594HVN-3.3 draws 140–250 μA quiescent current over temperature (−40°C to +125°C). In shutdown mode - achieved by pulling the ON/OFF pin above 1.3 V - it draws 85 μA typical standby current, enabling ultra-low-power operation in battery-powered or energy-harvesting applications where intermittent wake-up is required.
Is the LM2594HVN-3.3 pin-compatible with other members of the LM2594xx family?
Yes, the LM2594HVN-3.3 shares identical 8-pin SOIC (D) package pinout and electrical behavior with all fixed-output LM2594xx variants (e.g., LM2594HVN-5.0, LM2594HVN-12), including NC pins 1–3, Feedback on pin 4, ON/OFF on pin 5, Ground on pin 6, +VIN on pin 7, and Output on pin 8 - enabling direct substitution within the same voltage grade and package type.
LM2594HVN-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2594HVN-3.3 FAQ
1.How can I place an order for LM2594HVN-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVN-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 LM2594HVN-3.3 reliable?
The price and inventory of LM2594HVN-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 LM2594HVN-3.3 is usually 5 days.
3.What payment methods are accepted for LM2594HVN-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVN-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVN-3.3?
LM2594HVN-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVN-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 LM2594HVN-3.3?
For technical support, including LM2594HVN-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVN-3.3 requirements.
6.How does Aetrix verify that LM2594HVN-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2594HVN-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 LM2594HVN-3.3 meets industry standards.
7.What is the process for return or replacement of LM2594HVN-3.3?
All LM2594HVN-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVN-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 LM2594HVN-3.3 part is unused and in its original packaging.
Return procedure for LM2594HVN-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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