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Texas Instruments LM2594MX-ADJ/NOPB
- Part No.:
- LM2594MX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594MX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,777
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Product details
Overview
LM2594MX-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator IC delivering up to 0.5 A output current with adjustable output voltage from 1.2 V to 37 V, ±4% tolerance over line and load, operating from 4.5 V to 40 V input, and featuring 150-kHz fixed-frequency internal oscillator and TTL-compatible ON/OFF control - used in industrial power supplies and embedded system point-of-load conversion.
For engineers reviewing the LM2594MX-ADJ/NOPB datasheet, LM2594MX-ADJ/NOPB pinout, LM2594MX-ADJ/NOPB application, or LM2594MX-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–40 V), feedback reference voltage (1.23 V), thermal shutdown protection, SOIC-8 package compatibility, and external component count (only four required).
Technical Context
The LM2594MX-ADJ/NOPB integrates a PWM controller, power switch, oscillator, error amplifier, and thermal/current protection circuitry in a single SOIC-8 package. Its feedback loop uses an internal 1.23-V reference and senses output via external resistor divider at the FB pin, enabling precise regulation across the 1.2–37-V range.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads; switching frequency remains fixed at 150 kHz unless second-stage current limiting activates, which reduces frequency under overload. Standby quiescent current is 85 μA when the ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 0.5 A DC maximum - ensures stable operation driving mid-power microcontrollers or analog subsystems without external current boosting. |
| Input voltage range | 4.5 V to 40 V - supports wide-input industrial rails including 12 V, 24 V, and 36 V nominal systems. |
| Feedback reference | 1.23 V ±0.037 V - sets output voltage via external R1/R2 divider; enables accurate 1.2–37 V adjustment with <±4% total error. |
| Switching frequency | 150 kHz ±20 kHz - fixed internal oscillator simplifies EMI filtering and allows use of low-cost, standard inductors. |
| Quiescent current | 10 mA typical - defines minimum input draw during active regulation; critical for battery-backed or low-power standby designs. |
| Standby current | 85 μA - achieved when ON/OFF pin >1.3 V; enables ultra-low-power shutdown for energy-sensitive applications. |
| Saturation voltage | 1.1 V max at 0.5 A - determines conduction loss in internal NPN switch; impacts efficiency especially at low VIN/VOUT ratios. |
| Thermal shutdown | Activated at TJ ≥150 °C - protects device during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
LM2594MX-ADJ/NOPB is supplied in an 8-pin surface-mount SOIC package (body size 4.90 mm × 3.91 mm), optimized for thermal performance on standard PCBs with exposed pad grounding recommended per TI layout guidelines.
| 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 datasheet recommendation. |
| 4 | Feedback (FB) | High-impedance input sensing output voltage via resistor divider; bias current ≤50 nA minimizes divider error. |
| 5 | ON/OFF | TTL-compatible shutdown control; <1.3 V = ON, >1.3 V = OFF; draws ≤15 μA in OFF state. |
| 6 | Ground | Power and signal reference node; requires low-impedance connection to minimize noise and thermal resistance. |
| 7 | +VIN | Main power input; requires local 68-μF tantalum bypass capacitor to handle high di/dt switching currents. |
| 8 | Output | Internal NPN switch collector; swings between (VIN − VSAT) and ≈−0.5 V; minimal copper area advised to reduce EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 150-kHz oscillator | Eliminates need for external timing components and ensures predictable EMI profile for compliance-critical designs. |
| Internal compensation | Reduces external component count to only four: input cap, output cap, catch diode, and inductor - accelerates prototyping. |
| Thermal + current limiting | Two-stage current limit and junction temperature cutoff prevent catastrophic failure during short-circuit or overload conditions. |
| Adjustable output range | 1.2 V to 37 V coverage supports diverse rail requirements - from low-voltage logic to industrial sensor interfaces. |
| TTL shutdown interface | Direct compatibility with microcontroller GPIOs enables seamless power sequencing and system-level sleep control. |
| SOIC-8 packaging | Industry-standard footprint allows drop-in replacement in legacy designs and supports automated SMT assembly. |
Applications
| Industrial Power Supply | Embedded System PoL |
|---|---|
Use Scenario: Converting 24-V factory bus to 5-V/3.3-V for PLC I/O modules and field sensors. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC rails with line/load regulation <±0.5%. Use Value: Ensures stable microcontroller operation under varying load and input ripple; 0.5-A capability supports multiple peripherals without derating. | Use Scenario: Generating 3.3-V supply for ARM Cortex-M4 MCU and associated ADC/DAC in portable test equipment. IC Role / Device Role / Timing Role: Point-of-load converter with ON/OFF control synchronized to host processor sleep states. Use Value: 85-μA standby current extends battery life; 150-kHz switching enables compact 10-μH inductor selection. |
| Preregulator for Linear Regulator | Positive-to-Negative Converter |
Use Scenario: Stepping 12-V input down to 6-V before LDO to reduce thermal dissipation in analog front-end circuits. IC Role / Device Role / Timing Role: Efficient preregulator reducing dropout voltage stress on downstream linear regulators. Use Value: Improves overall system efficiency to >80% vs. direct 12-V-to-3.3-V LDO (which would dissipate >2 W at 0.5 A). | Use Scenario: Generating −5-V rail from +12-V supply for op-amp biasing in precision instrumentation. IC Role / Device Role / Timing Role: Inverting buck-boost topology using internal switch and external diodes/capacitors. Use Value: Eliminates need for dedicated inverting IC; leverages same LM2594MX-ADJ/NOPB die with modified external network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594HVMX-ADJ/NOPB | Supports 4.5–60 V input (vs. 4.5–40 V); identical pinout, feedback, and functional behavior. | Required for >40 V input systems (e.g., automotive 48-V architectures or industrial 48-V buses). | Select LM2594HVMX-ADJ/NOPB when input may exceed 40 V; otherwise LM2594MX-ADJ/NOPB suffices and offers lower cost. |
| LMR36506RNXR | 65-V input, 0.6-A synchronous buck; integrated high/low-side FETs; 2.1-MHz switching; smaller solution size. | Targets space-constrained, high-efficiency designs where BOM count and thermal footprint are critical. | Choose LMR36506RNXR for new designs needing higher efficiency (>90%) or smaller PCB area; LM2594MX-ADJ/NOPB remains preferred for legacy compatibility and cost-sensitive volume production. |
Compared with LM2594HVMX-ADJ/NOPB, the LM2594MX-ADJ/NOPB trades 20-V input headroom for lower unit cost and qualification maturity; versus LMR36506RNXR, it sacrifices efficiency and integration for design simplicity, proven reliability, and minimal external component count.
Availability
LM2594MX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and test equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for LM2594MX-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 reliable, high-volume power IC manufacturing.
The LM2594xx SIMPLE SWITCHER® product line was designed for cost-sensitive, robust DC-DC conversion in industrial, automotive, and consumer applications where ease of use, minimal external components, and proven thermal reliability are prioritized.
FAQ
What is the maximum input voltage rating for LM2594MX-ADJ/NOPB?
The absolute maximum input voltage for LM2594MX-ADJ/NOPB is 45 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V risks violating recommended conditions and may trigger thermal shutdown or reduce long-term reliability. For 60-V operation, the LM2594HVMX-ADJ/NOPB variant must be used instead. The LM2594MX-ADJ/NOPB datasheet specifies these limits in Section 7.1 Absolute Maximum Ratings and Section 7.3 Recommended Operating Conditions.
How does the feedback pin (Pin 4) function in LM2594MX-ADJ/NOPB?
The feedback pin (Pin 4) of LM2594MX-ADJ/NOPB senses the output voltage through an external resistor divider and compares it to an internal 1.23-V reference. It draws ≤50 nA bias current, enabling high-resistance dividers that minimize quiescent power loss. The output voltage is set by VOUT = 1.23 × (1 + R1/R2), where R1 connects from output to FB and R2 from FB to ground. This configuration is validated in Section 7.8 Electrical Characteristics – Adjustable of the LM2594MX-ADJ/NOPB datasheet.
Can LM2594MX-ADJ/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2594MX-ADJ/NOPB supports inverting regulator topologies by reconfiguring the ground and feedback connections as shown in Figure 8-5 of the LM2594MX-ADJ/NOPB datasheet. In this mode, the IC's ground pin floats at the negative output voltage, and the feedback pin is referenced to system ground, enabling generation of regulated negative rails such as −5 V or −12 V from a positive input. External Schottky diodes and careful layout are required for stability and start-up reliability.
What thermal considerations apply to LM2594MX-ADJ/NOPB in SOIC-8 package?
LM2594MX-ADJ/NOPB in SOIC-8 has a junction-to-ambient thermal resistance (RθJA) of 150 °C/W on a standard 4-layer JEDEC board. To maintain safe operation below 125 °C junction temperature at full 0.5-A load, PCB layout must maximize copper area under Pins 1–3 (NC, tied to ground) and Pin 6 (GND), and ensure adequate airflow or heatsinking. Thermal shutdown activates at 150 °C, and the device resumes operation after cooling. These parameters are specified in Section 7.4 Thermal Information of the LM2594MX-ADJ/NOPB datasheet.
Is LM2594MX-ADJ/NOPB RoHS-compliant and lead-free?
Yes, LM2594MX-ADJ/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (TI's designation for lead-free, RoHS-compliant packaging). It meets J-STD-020 moisture sensitivity level 3 and is qualified for standard SnPb or lead-free reflow profiles. Full compliance documentation, including material declarations and test reports, is available in TI's official product folder for LM2594MX-ADJ/NOPB.
LM2594MX-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):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- 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
LM2594MX-ADJ/NOPB FAQ
1.How can I place an order for LM2594MX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594MX-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 LM2594MX-ADJ/NOPB reliable?
The price and inventory of LM2594MX-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 LM2594MX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594MX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594MX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594MX-ADJ/NOPB?
LM2594MX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594MX-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 LM2594MX-ADJ/NOPB?
For technical support, including LM2594MX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594MX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2594MX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594MX-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 LM2594MX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594MX-ADJ/NOPB?
All LM2594MX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594MX-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 LM2594MX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2594MX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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