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Texas Instruments LM2594HVM-3.3
- Part No.:
- LM2594HVM-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594HVM-3.3.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,622
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Product details
Overview
LM2594HVM-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 over line and load, and fixed 150-kHz switching frequency - used in industrial power supplies requiring robust input voltage headroom.
For engineers reviewing the LM2594HVM-3.3 datasheet, LM2594HVM-3.3 pinout, LM2594HVM-3.3 application, or LM2594HVM-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 packaging for board space-constrained designs.
Technical Context
The LM2594HVM-3.3 integrates a PWM controller, power switch, and internal frequency compensation in a monolithic buck regulator architecture. It operates in continuous or discontinuous conduction mode, uses external diode/inductor/capacitor for energy transfer, and features undervoltage lockout and two-stage current limiting.
Its feedback loop senses output via internal 1.23-V reference and external resistor divider (for adjustable variants) or direct internal connection (for fixed 3.3-V version). The ON/OFF pin enables logic-level shutdown with 85-μA standby current and 1.3-V threshold, referenced to ground regardless of output configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full temperature and load range - ensures stable microcontroller core supply without external feedback resistors. |
| Max Input Voltage | 60 V - supports wide-input industrial, automotive, and telecom applications where transient spikes exceed 40 V. |
| Output Current | 0.5 A DC - sufficient for powering FPGA I/O banks, sensor signal chains, or isolated gate drivers without derating. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Quiescent Current | 140–250 μA - minimizes no-load power loss in battery-backed or always-on systems. |
| Standby Current | 85 μA - allows deep sleep modes while retaining fast wake-up response via ON/OFF pin. |
| Thermal Protection | Internal overtemperature shutdown - prevents latch-up or permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
LM2594HVM-3.3 is supplied in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present - suitable for standard reflow assembly and moderate power dissipation.
| 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 | Not used in fixed 3.3-V version - internally tied to reference; leave floating or connect to output per layout guidelines. |
| 5 | ON/OFF | Logic-level shutdown input; <1.3 V = ON, >1.3 V = OFF - enables system-level power sequencing and fault recovery. |
| 6 | Ground | Main power and signal return path - requires low-impedance connection to minimize noise coupling into feedback node. |
| 7 | +VIN | Main input supply pin - requires local 68-μF tantalum or low-ESR ceramic bypass capacitor to suppress switching transients. |
| 8 | Output | Switch node - connects to external catch diode anode and inductor; high dv/dt demands minimal copper area to reduce EMI radiation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V Output | Eliminates external feedback resistors and associated layout sensitivity - simplifies BOM and improves long-term output stability. |
| 60-V Input Rating | Supports 48-V industrial bus systems with 20% margin - avoids need for pre-regulation stages in factory automation equipment. |
| TTL-Compatible Shutdown | Enables direct interfacing with microcontroller GPIO without level-shifting - reduces component count in programmable power management subsystems. |
| Thermal + Current Limit Protection | Prevents catastrophic failure during short-circuit or overheating events - eliminates need for external circuit breakers in embedded power modules. |
| 150-kHz Fixed Oscillator | Ensures predictable EMI profile and simplifies filter design - avoids variable-frequency jitter issues common in spread-spectrum controllers. |
Applications
| Industrial Sensor Node Power | 48-V Fieldbus Pre-regulator |
|---|---|
Use Scenario: Powering analog front-end, ADC, and low-power MCU in IP67-rated environmental sensors deployed on factory floors. IC Role / Device Role / Timing Role: Primary step-down regulator converting 48-V fieldbus supply to clean 3.3-V rail for precision measurement circuitry. Use Value: 60-V input rating tolerates 48-V bus transients; ±4% output tolerance maintains ADC reference accuracy across temperature swings. | Use Scenario: Intermediate regulation stage feeding linear regulators that supply noise-sensitive RF transceivers in industrial gateways. IC Role / Device Role / Timing Role: Efficient preregulator reducing 48-V input to 5-V or 3.3-V before LDO post-regulation. Use Value: 80% efficiency at 0.5-A load minimizes heat buildup in sealed enclosures; 150-kHz switching enables compact LC filter design. |
| Ruggedized Motor Control Board | Legacy PLC I/O Module Supply |
Use Scenario: Providing auxiliary 3.3-V logic supply on motor driver boards exposed to high-voltage switching noise and 60-V bus surges. IC Role / Device Role / Timing Role: Isolated buck converter powering gate driver logic and communication interfaces (RS-485, CAN). Use Value: Internal thermal shutdown protects against MOSFET shoot-through faults; SOIC-8 package withstands vibration and thermal cycling. | Use Scenario: Replacing aging linear regulators in programmable logic controller I/O modules requiring reliable 3.3-V supply from 24-V or 48-V backplane. IC Role / Device Role / Timing Role: Drop-in upgrade for legacy 78L33-based designs needing higher efficiency and wider input range. Use Value: Pin-compatible replacement in SOIC-8 footprint; eliminates heat sink requirement and extends module lifetime under continuous operation. |
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 rated for 40-V max input; same SOIC-8 package, pinout, and electrical specs except input voltage limit. | Suitable only for ≤40-V systems; cannot replace LM2594HVM-3.3 in 48-V or surge-prone environments. | Select LM2594MX-3.3 only when input never exceeds 40 V and cost is primary constraint. |
| LMR36506RNXR | Synchronous buck with 3–65-V input, 0.6-A output, integrated FETs, and 2.1-MHz switching - smaller solution size but requires different layout and compensation. | Targets space-constrained, high-efficiency designs; lacks HV-specific robustness and legacy compatibility of LM2594HVM-3.3. | Choose LMR36506RNXR for new designs prioritizing efficiency and footprint; retain LM2594HVM-3.3 for drop-in HV upgrades or thermal margin-critical applications. |
Compared with LM2594MX-3.3, LM2594HVM-3.3 adds 20-V input headroom critical for industrial transients; versus LMR36506RNXR, it trades higher efficiency and smaller size for proven ruggedness, simpler external component count, and direct SOIC-8 replacement capability in legacy systems.
Availability
LM2594HVM-3.3 is available at Aetrix Electronics and suitable for industrial sensor nodes, 48-V fieldbus pre-regulators, and ruggedized motor control boards requiring stable component supply across extended product lifecycles.
Supply support for LM2594HVM-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 over 90 years of innovation history.
The LM2594HVM-3.3 belongs to TI's SIMPLE SWITCHER® family - designed specifically for robust, easy-to-implement DC-DC conversion in industrial, automotive, and telecom infrastructure where reliability and wide input range are mandatory.
FAQ
What is the maximum input voltage rating for the LM2594HVM-3.3?
The LM2594HVM-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 LM2594MX-3.3 (40 V max) and enables use in 48-V industrial systems with transient margin. Exceeding 60 V risks permanent damage to the internal switch.
Does the LM2594HVM-3.3 require external feedback resistors to set its output voltage?
No, the LM2594HVM-3.3 does not require external feedback resistors because it is 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 should be left unconnected or tied to output per TI layout guidance - unlike the adjustable LM2594HV version.
Can the LM2594HVM-3.3 be used in an inverting (positive-to-negative) topology?
Yes, the LM2594HVM-3.3 can be configured as a positive-to-negative converter by bootstrapping the ground pin to the negative output, as documented in Figure 8-5 of the datasheet. However, this requires additional components including Schottky diodes and careful attention to maximum voltage stress (input + |output| ≤ 60 V), and the ON/OFF threshold shifts to ~13 V in this configuration.
What thermal performance can be expected from the LM2594HVM-3.3 in SOIC-8 package?
In the SOIC-8 (D) package, the LM2594HVM-3.3 has a junction-to-ambient thermal resistance (RθJA) of 150°C/W under JEDEC 4-layer board conditions. At 0.5-A load and 12-V input, typical power dissipation is ~1.1 W, resulting in ~165°C junction rise above ambient - necessitating adequate copper pour or forced air cooling to stay within the 150°C max junction limit.
Is the LM2594HVM-3.3 pin-compatible with other members of the LM2594xx family?
Yes, the LM2594HVM-3.3 shares identical 8-pin SOIC pinout and function mapping with all LM2594xx variants (e.g., LM2594MX-3.3, LM2594HVM-5.0, LM2594HVM-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 where input voltage and output requirements align.
LM2594HVM-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2594HVM-3.3 FAQ
1.How can I place an order for LM2594HVM-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVM-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 LM2594HVM-3.3 reliable?
The price and inventory of LM2594HVM-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 LM2594HVM-3.3 is usually 5 days.
3.What payment methods are accepted for LM2594HVM-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVM-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVM-3.3?
LM2594HVM-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVM-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 LM2594HVM-3.3?
For technical support, including LM2594HVM-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVM-3.3 requirements.
6.How does Aetrix verify that LM2594HVM-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2594HVM-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 LM2594HVM-3.3 meets industry standards.
7.What is the process for return or replacement of LM2594HVM-3.3?
All LM2594HVM-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVM-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 LM2594HVM-3.3 part is unused and in its original packaging.
Return procedure for LM2594HVM-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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