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Texas Instruments LM2594HVMX-ADJ/NOPB
- Part No.:
- LM2594HVMX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594HVMX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,644
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Product details
Overview
LM2594HVMX-ADJ/NOPB from Texas Instruments is a nonsynchronous step-down DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers up to 0.5 A output current, supports 4.5 V to 60 V input range, provides adjustable 1.2 V to 37 V output (±4% tolerance), and operates at a fixed 150-kHz switching frequency with TTL-compatible ON/OFF control.
For engineers reviewing the LM2594HVMX-ADJ/NOPB datasheet, LM2594HVMX-ADJ/NOPB pinout, LM2594HVMX-ADJ/NOPB application, or LM2594HVMX-ADJ/NOPB equivalent, key selection criteria include HV input capability, thermal shutdown protection, low 85 μA standby current, feedback bias current under 50 nA, and SOIC-8 surface-mount packaging for board space-constrained designs.
Technical Context
The LM2594HVMX-ADJ/NOPB integrates a PWM controller, power switch, oscillator, and internal compensation in a monolithic buck topology. Its feedback pin senses output voltage via external resistor divider, enabling precise regulation across line and load variations. The device uses a two-stage current-limiting scheme and thermal shutdown for fault protection.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads. The ON/OFF pin accepts logic-level signals (1.3 V threshold) for external enable/disable control, and its saturation voltage remains ≤1.2 V at 0.5 A, minimizing conduction loss in high-VIN applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial rails including 24 V, 36 V, and 48 V systems without pre-regulation. |
| Output Current | 0.5 A - sufficient for powering microcontrollers, sensors, and analog circuitry in embedded systems. |
| Switching Frequency | 150 kHz ±15% - enables use of standard off-the-shelf inductors and simplifies EMI filtering design. |
| Feedback Voltage | 1.23 V (typical), ±4% over temp - sets output accuracy and determines resistor-divider ratio for custom VOUT. |
| Quiescent Current | 140–250 μA - ensures low power draw during operation, critical for battery-backed or always-on systems. |
| Standby Current | 85 μA - enables ultra-low-power shutdown state when ON/OFF pin is pulled high. |
| Saturation Voltage | ≤1.2 V at 0.5 A - limits conduction loss and junction temperature rise under full load at high VIN. |
Pinout & Package
LM2594HVMX-ADJ/NOPB is housed in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. 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 thermal relief only. |
| 4 | Feedback Input | High-impedance node sensing output voltage via external resistor divider; bias current <50 nA minimizes divider error. |
| 5 | ON/OFF Control | TTL-compatible enable pin: <1.3 V = ON, >1.3 V = OFF; draws <15 μA in shutdown. |
| 6 | Ground | Power and signal reference return path; connects to system GND and input/output capacitor grounds. |
| 7 | +VIN | Main power input; requires local 68 μF tantalum or equivalent low-ESR capacitor for transient suppression. |
| 8 | Output Switch | Drains internal NPN switch; connects to catch diode anode and inductor; voltage swings between (VIN − VSAT) and ≈−0.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 150-kHz oscillator | Eliminates need for external timing components and ensures predictable EMI profile for compliance testing. |
| Internal frequency compensation | Reduces external component count to just four: input cap, output cap, inductor, and feedback divider - no loop compensation required. |
| Thermal shutdown + current limit | Two-stage current limiting and overtemperature cutoff prevent damage during overload, short-circuit, or poor heatsinking conditions. |
| Adjustable output (1.2–37 V) | Supports diverse system rail requirements using only two external resistors - avoids stocking multiple fixed-output variants. |
| TTL shutdown with 85 μA ISTBY | Enables clean power sequencing and low-power sleep modes in portable or energy-sensitive applications. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V truck battery to stable 5 V for MCU and CAN transceiver. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated 5 V rail with high line regulation across cold-crank (6 V) to load-dump (60 V) events. Use Value: Withstands 60 V max input and maintains ±4% output accuracy, eliminating need for external TVS or pre-regulator stages. | Use Scenario: Generating 3.3 V for infotainment SoC from 12 V vehicle battery with variable ripple and transients. IC Role / Device Role / Timing Role: Buck converter supplying low-noise, thermally robust 3.3 V rail; ON/OFF pin synchronized to ignition signal for controlled startup. Use Value: 150-kHz fixed frequency allows deterministic EMI filtering; 85 μA standby current extends battery life during vehicle sleep mode. |
| Programmable Logic Controller (PLC) I/O Module | Outdoor Telecom Remote Unit |
Use Scenario: Deriving 12 V auxiliary supply from 48 V PoE++ or DC distribution bus for sensor interface circuitry. IC Role / Device Role / Timing Role: High-efficiency preregulator stepping down 48 V to 12 V before LDO post-regulation for analog front-end. Use Value: 88% efficiency at 25 VIN/0.5 A reduces thermal load in sealed enclosures; SOIC-8 footprint eases layout in dense I/O card designs. | Use Scenario: Powering RF amplifier and baseband processor in uncooled outdoor small cell unit operating at −40°C to +85°C. IC Role / Device Role / Timing Role: Main DC-DC converter delivering 5 V/0.5 A from solar-charged 48 V battery bank with wide-temp reliability. Use Value: Guaranteed 0.5 A output and ±4% regulation over full temperature range ensure consistent RF performance without derating. |
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-ADJ/NOPB | Lower max input voltage (40 V vs. 60 V); identical pinout, feedback, and functional behavior. | Not suitable for 48 V+ systems or automotive load-dump scenarios requiring 60 V rating. | Select LM2594MX-ADJ/NOPB only if input never exceeds 40 V and cost is primary constraint. |
| LMR36506RNXR | Synchronous buck, 3–65 V input, 0.6 A, 2.1 MHz switching, integrated inductor option available. | Higher efficiency (>90%), smaller solution size, but requires different layout and control loop tuning. | Choose LMR36506RNXR for new designs prioritizing efficiency, size, and modern feature set - not drop-in replacement. |
Compared with LM2594HVMX-ADJ/NOPB, LM2594MX-ADJ/NOPB offers identical functionality at lower voltage stress, while LMR36506RNXR delivers higher performance with trade-offs in design complexity and BOM compatibility.
Availability
LM2594HVMX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LM2594HVMX-ADJ/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 LM2594HVMX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family, engineered for ease-of-use in cost-sensitive, high-input-voltage DC-DC applications where minimal external components and proven reliability are essential.
FAQ
What is the maximum input voltage rating for LM2594HVMX-ADJ/NOPB?
The LM2594HVMX-ADJ/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 (40 V max) and makes it suitable for 48 V industrial buses and automotive load-dump conditions. Exceeding 60 V risks permanent damage per Absolute Maximum Ratings.
Can LM2594HVMX-ADJ/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2594HVMX-ADJ/NOPB supports inverting regulator topologies per TI's Figure 8-5. In this mode, the ground pin floats at the negative output voltage, and the feedback pin is referenced to system ground. The device regulates inverted outputs such as −5 V or −12 V, though maximum input-to-output voltage differential must remain ≤60 V, and startup current demands are higher than in buck mode.
What is the feedback pin bias current specification for LM2594HVMX-ADJ/NOPB?
The feedback pin bias current for LM2594HVMX-ADJ/NOPB is specified as 10–50 nA (typical 50 nA) at 25°C, and up to 100 nA over full temperature range. This low bias current ensures minimal error in resistor-divider-based output programming, allowing use of high-value resistors to reduce divider power loss without compromising regulation accuracy.
Does LM2594HVMX-ADJ/NOPB require external compensation components?
No, LM2594HVMX-ADJ/NOPB features internal frequency compensation and requires no external compensation network. Its architecture is optimized for stability with standard external components: one input capacitor, one output capacitor, one power inductor, and two feedback resistors. This simplifies design and eliminates loop-tuning effort typical of more complex controllers.
What package type and thermal characteristics apply to LM2594HVMX-ADJ/NOPB?
LM2594HVMX-ADJ/NOPB is supplied in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size and RθJA = 150°C/W on a JEDEC-standard 4-layer board. It does not include an exposed thermal pad. For thermal management, TI recommends soldering pins 1–3 (NC) to ground plane to improve heat conduction, as these pins have no internal connection but aid in PCB-level thermal dissipation.
LM2594HVMX-ADJ/NOPB 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:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 57V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM2594HVMX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVMX-ADJ/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 LM2594HVMX-ADJ/NOPB reliable?
The price and inventory of LM2594HVMX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594HVMX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594HVMX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVMX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVMX-ADJ/NOPB?
LM2594HVMX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVMX-ADJ/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 LM2594HVMX-ADJ/NOPB?
For technical support, including LM2594HVMX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVMX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2594HVMX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594HVMX-ADJ/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 LM2594HVMX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594HVMX-ADJ/NOPB?
All LM2594HVMX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVMX-ADJ/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 LM2594HVMX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2594HVMX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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