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Texas Instruments LM2594HVN-12
- Part No.:
- LM2594HVN-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2594HVN-12.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,930
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Product details
Overview
LM2594HVN-12 from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC delivering 12 V fixed output at up to 0.5 A, with input voltage support up to 60 V, 150-kHz fixed-frequency operation, and ±4% output voltage tolerance over line and load. It serves as a primary on-board power regulator in industrial control modules requiring robust input transient handling.
For engineers reviewing the LM2594HVN-12 datasheet, LM2594HVN-12 pinout, LM2594HVN-12 application, or LM2594HVN-12 equivalent, key selection criteria include HV input capability (60 V max), thermal shutdown protection, TTL-compatible ON/OFF control, low 85 μA standby current, and compatibility with standard off-the-shelf inductors - all critical for ruggedized embedded power design.
Technical Context
The LM2594HVN-12 integrates a PWM controller, power switch, oscillator, error amplifier, and current-limit circuit in a single SOIC-8 package. Its internal 150-kHz oscillator enables predictable EMI filtering and simplifies external component selection, while the two-stage current limit provides soft-foldback during overload without latch-up.
Operation relies on voltage-mode control with internal frequency compensation, eliminating need for external loop compensation components. The feedback pin senses output via internal 1.23 V reference, and the ON/OFF pin supports logic-level shutdown with 1.3 V threshold, enabling precise sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full temperature and load range - ensures stable rail for microcontrollers and analog sensors without external resistive divider. |
| Max Input Voltage | 60 V - supports wide-range industrial inputs including 48 V nominal bus with surge margin. |
| Output Current | 0.5 A continuous - sufficient for powering multiple low-power peripherals (e.g., RS-485 transceivers, ADCs, GPIO expanders) from one regulator. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost 100–220 μH inductors with minimal core loss and predictable EMI profile. |
| Standby Quiescent Current | 85 μA typical - allows low-power system sleep modes without significant battery drain in remote monitoring nodes. |
| Thermal Protection | Internal overtemperature shutdown - prevents damage during sustained overload or poor heatsinking in enclosed enclosures. |
| Current Limit | 0.65–1.3 A peak - provides short-circuit robustness while permitting brief inrush during cold start of downstream capacitive loads. |
Pinout & Package
LM2594HVN-12 is housed in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and exposed pad for enhanced thermal performance. Pin 1–3 are no-connect (NC) but require PCB soldering for mechanical stability and thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No connection | Internally unconnected; must be soldered to PCB ground plane for thermal relief and mechanical anchoring. |
| 4 | Feedback | Input to error amplifier; tied directly to output for fixed 12 V version - no external resistor network required. |
| 5 | ON/OFF | Logic-controlled enable; <1.3 V = ON, >1.3 V = OFF - supports microcontroller GPIO direct drive or RC delay circuits. |
| 6 | Ground | Power and signal reference return; requires low-impedance connection to input/output capacitor grounds. |
| 7 | +VIN | Main power input; accepts 4.5–60 V DC - requires ≥68 μF low-ESR input capacitor placed within 5 mm. |
| 8 | Output | Switch node; connects to inductor and catch diode anode - demands minimal copper area to reduce EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% regulation across −40°C to +125°C. |
| 60 V maximum input | Enables direct regulation from 48 V industrial buses or automotive 36 V transients without pre-regulation stage. |
| TTL-compatible ON/OFF | Allows seamless integration with 3.3 V or 5 V logic controllers without level-shifting, supporting power sequencing and fault recovery. |
| Self-contained protection | Integrates thermal shutdown and cycle-by-cycle current limiting - no external sensing or latch circuitry needed for basic fault resilience. |
| Standard inductor support | Works with widely available 100–220 μH shielded power inductors (e.g., Coilcraft XAL, Bourns SRR), accelerating prototyping and sourcing. |
Applications
| Industrial Sensor Node Power | PLC I/O Module Supply |
|---|---|
|
Use Scenario: Powering 4–20 mA transmitter circuits, isolated ADCs, and microcontrollers in field-mounted sensor enclosures exposed to 48 V DC supply with ±20% ripple. IC Role / Device Role / Timing Role: Primary buck regulator converting 48 V bus to clean 12 V rail for analog front-end and digital logic. Use Value: 60 V input rating withstands brownouts and surges; 85 μA standby current extends battery backup runtime during mains failure. |
Use Scenario: Providing auxiliary 12 V supply for digital I/O isolation barriers and optocoupler drivers in modular programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling main 24 V backplane to minimize noise coupling into sensitive isolation interfaces. Use Value: Fixed 12 V output eliminates trimming; thermal shutdown prevents latch-up during hot-swap insertion under load. |
| Remote RTU Power | Legacy Equipment Retrofit |
|
Use Scenario: Converting solar-charged 48 V battery bank to regulated 12 V for telemetry radios and GPS receivers in unattended remote terminal units. IC Role / Device Role / Timing Role: High-efficiency (>88% at 25 VIN/0.5 A) step-down converter operating across wide ambient temperature range. Use Value: 150 kHz switching enables small filter components; low 85 μA IQ preserves battery life during extended idle periods. |
Use Scenario: Replacing aging linear regulators (e.g., 7812) in legacy test equipment where board space and thermal management are constrained. IC Role / Device Role / Timing Role: Drop-in efficiency upgrade delivering same 12 V output with 75% less heat generation and no heatsink requirement. Use Value: SOIC-8 footprint matches common DIP-8 socket adapters; requires only 4 external components (inductor, diode, input/output caps). |
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-12/NOPB | 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 PDIP, but SOIC identical). | Suitable only for ≤40 V input systems; lacks surge margin for industrial 48 V bus applications. | Select LM2594MX-12/NOPB only when input never exceeds 40 V and cost is prioritized over HV robustness. |
| LMR36506RNXR | Synchronous buck with 3–65 V input, 0.6 A, integrated FETs, 2.1 MHz switching, and 2.5 μA quiescent current - significantly smaller solution size and higher efficiency. | Requires different layout (no external diode), supports tighter output voltage accuracy (±1%), and enables ultra-low-power always-on designs. | Choose LMR36506RNXR for new designs needing higher efficiency, smaller footprint, or sub-μA sleep current - not a drop-in replacement due to different pinout and control scheme. |
Compared with LM2594HVN-12, LM2594MX-12/NOPB trades HV capability for lower cost in benign-input environments, while LMR36506RNXR delivers modern synchronous performance at the expense of redesign effort and non-pin-compatibility.
Availability
LM2594HVN-12 is available at Aetrix Electronics and suitable for industrial automation, remote telemetry, and legacy equipment retrofit requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for LM2594HVN-12 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 industrial-grade power solutions.
The LM2594HV product line was designed specifically for high-input-voltage DC-DC conversion in harsh environments - targeting applications where 48 V, 60 V, or transient-prone supplies demand robust, simple, and thermally resilient regulation.
FAQ
What is the maximum input voltage rating for LM2594HVN-12?
The LM2594HVN-12 supports a maximum input voltage of 60 V, as confirmed in the Absolute Maximum Ratings table and Recommended Operating Conditions section of the official TI datasheet (SNVS118F). This HV rating distinguishes it from the standard LM2594 series (40 V max) and enables direct regulation from 48 V industrial buses with headroom for transients. Exceeding 60 V risks permanent damage.
Does LM2594HVN-12 require external feedback resistors to set its output voltage?
No, LM2594HVN-12 does not require external feedback resistors. As a fixed-output variant, it internally configures the feedback network for 12 V regulation - pin 4 (Feedback) is internally connected to the 1.23 V reference and output sense node. This eliminates resistor tolerance errors and layout sensitivity, ensuring guaranteed ±4% output accuracy across temperature and load without user adjustment.
Can LM2594HVN-12 be used in an inverting (positive-to-negative) configuration?
Yes, LM2594HVN-12 can be configured as a positive-to-negative converter per TI's Application Note SNVA229 and Figure 8-5 in the LM2594HV datasheet. In this topology, the IC's ground pin floats at the negative output voltage, and the feedback pin is referenced to system ground. However, the maximum voltage across the IC (|VIN| + |VOUT|) must remain ≤60 V, and additional Schottky diodes and startup timing considerations apply - full implementation details are documented in the datasheet's Section 8.3.3.
What is the typical efficiency of LM2594HVN-12 at full load?
LM2594HVN-12 achieves typical efficiency of 88% at 25 V input and 0.5 A output load, as specified in Section 7.7 (Electrical Characteristics – 12 V) of the TI datasheet. Efficiency varies with input voltage and load: it drops to ~80% at 12 VIN/0.5 A and improves slightly at higher input voltages due to reduced conduction losses. These values assume optimal external components (low-ESR capacitors, appropriate Schottky catch diode, and 100–220 μH inductor).
How does the ON/OFF pin function on LM2594HVN-12?
The ON/OFF pin (pin 5) of LM2594HVN-12 provides logic-level enable/disable control: pulling it below ~1.3 V (at 25°C) turns the regulator ON; pulling it above ~1.3 V shuts it down, reducing total input current to 85 μA typical. It accepts voltages up to 25 V, allowing direct interface with 3.3 V, 5 V, or 12 V logic without level shifters. If unused, it may be tied to ground or left floating - both default to ON state per datasheet Section 6.
LM2594HVN-12 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):
- 12V
- 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-12 FAQ
1.How can I place an order for LM2594HVN-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVN-12 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-12 reliable?
The price and inventory of LM2594HVN-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594HVN-12 is usually 5 days.
3.What payment methods are accepted for LM2594HVN-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVN-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVN-12?
LM2594HVN-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVN-12 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-12?
For technical support, including LM2594HVN-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVN-12 requirements.
6.How does Aetrix verify that LM2594HVN-12 is sourced from the original manufacturer or authorized distributors?
All LM2594HVN-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2594HVN-12?
All LM2594HVN-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVN-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2594HVN-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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