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Texas Instruments LM2594HVN-12/NOPB
- Part No.:
- LM2594HVN-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2594HVN-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:639
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Product details
Overview
LM2594HVN-12/NOPB from Texas Instruments is a nonsynchronous step-down DC-DC converter IC delivering 12 V fixed output at up to 0.5 A, with 4.5–60 V input range, 150-kHz fixed-frequency operation, and ±4% output voltage tolerance over line/load/temperature. It serves as a primary buck regulator in industrial power supplies requiring high-voltage input tolerance and minimal external components.
For engineers reviewing the LM2594HVN-12/NOPB datasheet, LM2594HVN-12/NOPB pinout, LM2594HVN-12/NOPB application, or LM2594HVN-12/NOPB equivalent, key selection criteria include HV input capability (60 V), thermal shutdown protection, TTL-compatible ON/OFF control, low 85 μA standby current, and SOIC-8 surface-mount packaging for board space-constrained designs.
Technical Context
The LM2594HVN-12/NOPB integrates a PWM controller, power switch, oscillator, and internal compensation in a monolithic buck topology. Its 150-kHz fixed-frequency oscillator enables predictable EMI filtering and simplifies inductor selection using standard off-the-shelf parts.
It operates in discontinuous or continuous conduction mode depending on load and inductance, features undervoltage lockout via the ON/OFF pin, and supports delayed start-up and inverting configurations through external resistor-capacitor networks and level-shifting circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line, load, and temperature range - ensures stable rail for downstream logic or analog circuitry without external feedback resistors. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-input industrial, automotive, and telecom applications without pre-regulation. |
| Max Output Current | 0.5 A DC - sufficient for powering microcontrollers, sensors, or interface ICs in distributed power architectures. |
| Switching Frequency | 150 kHz ±15% - enables use of low-cost, high-saturation-current inductors and reduces switching losses versus higher-frequency alternatives. |
| Standby Quiescent Current | 85 μA typical - minimizes system power draw during sleep or shutdown modes in battery-backed or energy-sensitive systems. |
| Thermal Protection | Internal overtemperature shutdown - prevents device damage under sustained overload or poor heatsinking conditions. |
| Current Limit | 0.58–1.4 A peak - provides robust short-circuit protection while allowing safe inrush during startup. |
Pinout & Package
LM2594HVN-12/NOPB is housed in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and standard 1.27 mm pitch. The package supports surface-mount assembly and provides adequate thermal dissipation (RθJA = 150°C/W) for moderate-power applications without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; must be soldered to PCB ground plane for thermal enhancement per TI recommendation. |
| 4 | Feedback Input | Not used in fixed-output version - internally tied to internal reference; leave floating or connect to ground per layout guidelines. |
| 5 | ON/OFF Control | TTL-compatible shutdown pin: <1.3 V = ON, >1.3 V = OFF; draws only 5–15 μA, enabling low-power enable sequencing. |
| 6 | Ground | Power and signal reference return path; requires low-impedance connection to minimize noise coupling into feedback loop. |
| 7 | +VIN | Main power input; requires local 68-μF tantalum or equivalent low-ESR capacitor to suppress switching transients and supply peak currents. |
| 8 | Output Switch | Drain of internal NPN transistor; connects to external catch diode and inductor; switching node demands minimized copper area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistor network, reducing BOM count and improving long-term output stability vs. adjustable variants. |
| 150-kHz internal oscillator | Enables predictable filter design and avoids external timing component placement sensitivity or drift-related instability. |
| TTL shutdown capability | Allows direct interfacing with microcontroller GPIOs or system-level power sequencers without level-shifting circuitry. |
| Thermal shutdown + current limit | Provides autonomous fault recovery in overtemperature or short-circuit events, reducing need for external supervision circuitry. |
| Requires only four external components | Supports rapid prototyping and production with minimal passive count: input cap, output cap, inductor, and catch diode. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24-V vehicle battery or 48-V industrial bus to stable 12-V rail for MCU, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary nonsynchronous buck regulator providing isolated, regulated 12-V supply with HV input tolerance and thermal protection. Use Value: Operates reliably across −40°C to +125°C ambient, withstands load dump transients up to 60 V, and maintains ±4% regulation under dynamic load steps. | Use Scenario: Generating 12-V auxiliary power from main battery in door modules, seat controllers, or lighting ECUs where space and component count are constrained. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter eliminating need for discrete controller + MOSFET + gate driver combinations. Use Value: SOIC-8 footprint fits tight PCB layouts; 85 μA standby current extends battery life during vehicle sleep mode; ON/OFF pin enables synchronized wake-up with CAN bus activity. |
| Programmable Logic Controller (PLC) I/O Card | Test & Measurement Equipment |
Use Scenario: Providing isolated 12-V bias for analog front-end op-amps, ADC drivers, and digital isolators on modular I/O cards operating from 24–48 V backplane. IC Role / Device Role / Timing Role: High-reliability buck regulator with built-in current limiting and thermal shutdown for field-deployed industrial hardware. Use Value: Withstands repeated overloads and ambient temperature swings; ±4% output accuracy meets precision analog supply requirements without post-regulation LDOs. | Use Scenario: Powering FPGA configuration circuitry, DACs, and reference buffers in portable bench instruments powered from universal AC adapters or lab supplies. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter delivering clean, stable 12-V rail with low quiescent current and fast transient response. Use Value: 150-kHz switching frequency balances efficiency and EMI; minimal external parts simplify compliance testing; SOIC-8 allows rework-friendly hand-soldering during prototype builds. |
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 electrical specs but in PDIP-8 package; RθJA = 95°C/W vs. 150°C/W for SOIC; no thermal pad. | Preferred for through-hole prototyping or legacy board compatibility; unsuitable for high-density SMT production. | Select when manual assembly, socketing, or thermal mass from leads outweighs surface-mount density advantages. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6 A, 2.1-MHz switching, integrated FETs; higher efficiency (>90%), smaller solution size. | Replaces LM2594HVN-12/NOPB in new designs requiring higher efficiency, lower EMI, or reduced board area - not drop-in compatible. | Choose for next-generation designs where efficiency, size, or modern feature set (e.g., spread-spectrum, power-good) justify redesign effort. |
Compared with LM2594MX-12/NOPB, LM2594HVN-12/NOPB offers superior thermal performance in compact SMT layouts; compared with LMR36506RNXR, it trades efficiency and integration for proven reliability, simpler magnetics, and zero-layout change in existing SOIC-8 footprints.
Availability
LM2594HVN-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM2594HVN-12/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 solutions.
The LM2594HV product line was designed for rugged, cost-sensitive step-down applications demanding wide input voltage range (up to 60 V), minimal external components, and robust protection features in industrial and transportation environments.
FAQ
What is the maximum input voltage rating for LM2594HVN-12/NOPB?
The LM2594HVN-12/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 (max 40 V) and enables direct use in 48-V industrial buses or automotive load-dump scenarios without external clamping. Always observe derating guidelines above 55 V ambient temperature.
Does LM2594HVN-12/NOPB require external feedback resistors?
No, LM2594HVN-12/NOPB is a fixed-output variant with internal resistor divider set to 12 V; no external feedback resistors are needed. Pin 4 (Feedback) is unused and may be left floating or grounded per TI layout recommendations. This simplifies design, improves output accuracy stability, and eliminates resistor tolerance and temperature drift effects on regulation.
Can LM2594HVN-12/NOPB be used in an inverting configuration?
Yes, LM2594HVN-12/NOPB supports inverting regulator topologies by bootstrapping its ground pin to the negative output rail. In this mode, it generates a −12-V output from a positive input. However, the ON/OFF pin threshold shifts to ~13 V, requiring level-shifting circuitry for proper shutdown control. Refer to Figure 8-5 in the official datasheet for validated component values and layout guidance.
What is the thermal resistance (RθJA) of LM2594HVN-12/NOPB in SOIC-8 package?
The LM2594HVN-12/NOPB in SOIC-8 (D) package has a junction-to-ambient thermal resistance (RθJA) of 150°C/W under JEDEC-standard 4-layer board conditions. This value assumes proper PCB copper pour under the exposed pad (pins 1–3) and adequate airflow. For continuous 0.5-A operation at high ambient temperatures, thermal relief traces and local heatsinking are recommended to maintain junction temperature below 125°C.
Is LM2594HVN-12/NOPB RoHS compliant and lead-free?
Yes, LM2594HVN-12/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (Texas Instruments' designation for lead-free, RoHS-compliant packaging). It meets J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LM2594HVN-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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):
- 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/NOPB FAQ
1.How can I place an order for LM2594HVN-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVN-12/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 LM2594HVN-12/NOPB reliable?
The price and inventory of LM2594HVN-12/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594HVN-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVN-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVN-12/NOPB?
LM2594HVN-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVN-12/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 LM2594HVN-12/NOPB?
For technical support, including LM2594HVN-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVN-12/NOPB requirements.
6.How does Aetrix verify that LM2594HVN-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594HVN-12/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 LM2594HVN-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594HVN-12/NOPB?
All LM2594HVN-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVN-12/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 LM2594HVN-12/NOPB part is unused and in its original packaging.
Return procedure for LM2594HVN-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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