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Texas Instruments LM2594M-ADJ/NOPB
- Part No.:
- LM2594M-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594M-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,819
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Product details
Overview
LM2594M-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter IC designed for fixed-frequency buck regulation in industrial and embedded power supplies. It delivers 0.5-A output current with ±4% output voltage accuracy, supports 1.2 V to 37 V adjustable output range, operates from 4.5 V to 40 V input, and integrates a 150-kHz internal oscillator - used in on-card switching regulators and efficient preregulators.
For engineers reviewing the LM2594M-ADJ/NOPB datasheet, LM2594M-ADJ/NOPB pinout, LM2594M-ADJ/NOPB application, or LM2594M-ADJ/NOPB equivalent, key selection criteria include feedback voltage (1.23 V typ), standby quiescent current (85 μA), thermal shutdown protection, SOIC-8 package compatibility, and requirement for only four external components.
Technical Context
The LM2594M-ADJ/NOPB implements a current-mode control architecture with internal frequency compensation and fixed 150-kHz oscillator. Its feedback loop senses output voltage via a precision 1.23-V reference at the FB pin, enabling programmable output using two external resistors.
It features TTL-compatible ON/OFF control with 1.3-V threshold, thermal shutdown, and two-stage current limiting (0.8-A peak typical). The internal NPN switch saturates at 1.1 V max under 0.5-A load, requiring an external catch diode and inductor for buck topology operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.5 A DC - ensures stable regulation under full-load conditions without derating in SOIC-8 package |
| Input Voltage Range | 4.5 V to 40 V - supports wide-input industrial rails including 12 V, 24 V, and 36 V systems |
| Feedback Voltage | 1.23 V (±0.05 V) - sets output via resistor divider; enables precise 1.2–37 V adjustment with <±4% total error |
| Switching Frequency | 150 kHz (±15%) - fixed internal oscillator simplifies EMI filtering and inductor selection |
| Standby Quiescent Current | 85 μA - enables low-power shutdown mode without external circuitry |
| Saturation Voltage | 1.1 V max at 0.5 A - defines minimum dropout and impacts efficiency at low VIN/VOUT ratios |
| Thermal Shutdown | Yes - activates at ~150°C junction temperature to prevent damage during overload or poor heatsinking |
Pinout & Package
LM2594M-ADJ/NOPB is housed in an 8-pin surface-mount SOIC package (body size 4.90 mm × 3.91 mm) with exposed pad not connected internally. Thermal resistance is 150°C/W junction-to-ambient on JEDEC 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | NC | No internal connection; must be soldered to PCB ground plane for thermal conduction |
| 4 | Feedback (FB) | High-impedance input sensing output voltage; bias current ≤50 nA enables high-resistor-divider use |
| 5 | ON/OFF | TTL-compatible shutdown control; <1.3 V = ON, >1.3 V = OFF; draws ≤15 μA when active |
| 6 | Ground | Power and signal reference; connects to system ground and input/output capacitor negatives |
| 7 | +VIN | Main power input; requires local 68-μF tantalum bypass capacitor to handle pulsed switch current |
| 8 | Output | Internal NPN switch collector; swings between (VIN − VSAT) and ~−0.5 V; drives external diode/inductor node |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150-kHz oscillator | Eliminates external timing components and ensures consistent switching frequency across temperature |
| ±4% output voltage accuracy | Guaranteed over line, load, and temperature - reduces need for post-regulation trimming |
| TTL shutdown with 85-μA standby | Enables system-level power sequencing without auxiliary logic or LDOs |
| Thermal + current-limit protection | Self-protecting operation under short-circuit or overheating - no external fault-handling circuitry required |
| Four-component design | Requires only diode, inductor, and two capacitors - minimizes BOM count and layout area |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Providing 5 V or 12 V from 24 V rail in PLC I/O modules with space-constrained PCBs. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24 V to stable 5 V for microcontroller and sensor subsystems. Use Value: Delivers 0.5 A with 80%+ efficiency at 12 VIN/5 VOUT, reducing heat generation versus linear regulators. | Use Scenario: Generating 3.3 V intermediate rail from 12 V input before low-noise LDO for FPGA core supply. IC Role / Device Role / Timing Role: High-efficiency preregulator lowering voltage prior to final LDO stage to minimize LDO power dissipation. Use Value: Reduces LDO thermal load by >70% compared to direct 12 V → 3.3 V linear conversion. |
| On-Card Buck Converter | Positive-to-Negative Converter |
Use Scenario: Local 3.3 V generation on a motor drive control board where centralized 5 V rail is unavailable. IC Role / Device Role / Timing Role: Standalone buck regulator placed near load to minimize IR drop and noise coupling. Use Value: SOIC-8 footprint and minimal external parts enable compact placement directly adjacent to MCU power pins. | Use Scenario: Generating −5 V for op-amp biasing in analog front-end circuits from existing +12 V supply. IC Role / Device Role / Timing Role: Inverting regulator topology using bootstrapped ground and external diodes to produce negative output. Use Value: Enables bipolar analog supplies without dedicated inverting IC; supports up to 0.3 A output with proper component selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594HV-ADJ/NOPB | Supports 60 V max input vs. 40 V; identical pinout, feedback, and protection features | Required for 48 V telecom or automotive battery-supplied designs where input may exceed 40 V | Select when VIN can reach 45–60 V; otherwise LM2594M-ADJ/NOPB offers lower cost and same performance at ≤40 V |
| LMR36506RNXR | Synchronous buck; 3–65 V input; 0.6 A; integrated high/low FETs; 2.1-MHz switching | Delivers higher efficiency (>90%), smaller solution size, and reduced EMI vs. nonsynchronous LM2594M-ADJ/NOPB | Choose for new designs prioritizing efficiency, size, or modern synchronous topology; not pin-compatible |
Compared with LM2594HV-ADJ/NOPB, the LM2594M-ADJ/NOPB trades 20 V input headroom for cost and legacy compatibility; compared with LMR36506RNXR, it offers proven reliability and simpler magnetics but lower efficiency and larger footprint.
Availability
LM2594M-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system preregulators, and on-card switching regulators requiring stable component supply across long-life production cycles.
Supply support for LM2594M-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 company specializing in analog, embedded processing, and power management ICs, with leadership in industrial, automotive, and communications markets.
The LM2594xx series was designed as a robust, easy-to-use SIMPLE SWITCHER® solution for cost-sensitive, medium-current DC-DC conversion where simplicity and reliability outweigh ultra-high efficiency or miniaturization demands.
FAQ
What is the maximum input voltage rating for LM2594M-ADJ/NOPB?
The absolute maximum input voltage for LM2594M-ADJ/NOPB is 45 V, but the recommended operating range is 4.5 V to 40 V. Exceeding 40 V risks violating safe operating area limits and may trigger thermal shutdown or reduce lifetime. For 45–60 V applications, TI specifies the LM2594HV-ADJ/NOPB variant instead. Always verify input transient margins against the Absolute Maximum Ratings table in the LM2594M-ADJ/NOPB datasheet.
How does the feedback pin (Pin 4) function in LM2594M-ADJ/NOPB?
The feedback pin (Pin 4) of LM2594M-ADJ/NOPB senses output voltage through a resistor divider and compares it to an internal 1.23-V reference. When the divided voltage equals 1.23 V, regulation is achieved. Bias current is ≤50 nA, allowing high-value resistors (e.g., 100 kΩ/24 kΩ for 5 V) to minimize divider power loss. This pin must be decoupled with a small capacitor (e.g., 1 nF) if noise immunity is critical in the LM2594M-ADJ/NOPB application.
Can LM2594M-ADJ/NOPB be used in an inverting configuration?
Yes, LM2594M-ADJ/NOPB supports inverting regulator topologies by bootstrapping its ground pin to the negative output rail and grounding the feedback pin. This configuration generates negative outputs such as −5 V from +12 V input. However, it requires two additional diodes (D1, D3), careful startup current management, and modified inductor selection (typically 100 µH). The LM2594M-ADJ/NOPB datasheet provides Figure 8-5 as a validated reference design.
What thermal considerations apply to LM2594M-ADJ/NOPB in SOIC-8 package?
LM2594M-ADJ/NOPB in SOIC-8 has a junction-to-ambient thermal resistance (RθJA) of 150°C/W on a standard 4-layer JEDEC board. At 0.5-A load and 12 VIN/5 VOUT, power dissipation is ~1.5 W, resulting in ~225°C junction rise above ambient - exceeding safe limits. Therefore, PCB copper pour under Pin 6 (GND) and Pins 1–3 (NC) is mandatory. Derating to 0.35 A at 70°C ambient is recommended unless enhanced heatsinking is implemented for the LM2594M-ADJ/NOPB.
Is LM2594M-ADJ/NOPB RoHS compliant and lead-free?
Yes, LM2594M-ADJ/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) and is qualified for lead-free reflow soldering profiles. Full compliance documentation, including substance declarations and test reports, is available in the official LM2594M-ADJ/NOPB product folder on ti.com.
LM2594M-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LM2594M-ADJ/NOPB FAQ
1.How can I place an order for LM2594M-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594M-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 LM2594M-ADJ/NOPB reliable?
The price and inventory of LM2594M-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 LM2594M-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594M-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594M-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594M-ADJ/NOPB?
LM2594M-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594M-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 LM2594M-ADJ/NOPB?
For technical support, including LM2594M-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594M-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2594M-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594M-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 LM2594M-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594M-ADJ/NOPB?
All LM2594M-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594M-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 LM2594M-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2594M-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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