My Inquiry
My Account
Texas Instruments LM2594M-12/NOPB
- Part No.:
- LM2594M-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594M-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:167
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2594M-12/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator delivering 12 V at up to 0.5 A, with 150-kHz fixed-frequency operation, ±4% output voltage tolerance over line and load, and input voltage support up to 40 V. It integrates PWM controller, power switch, and protection circuitry in an 8-pin SOIC package for compact on-card power conversion.
For engineers reviewing the LM2594M-12/NOPB datasheet, LM2594M-12/NOPB pinout, LM2594M-12/NOPB application, or LM2594M-12/NOPB equivalent, key selection criteria include guaranteed 0.5-A output current, 150-kHz oscillator frequency, TTL-compatible ON/OFF control, thermal shutdown, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2594M-12/NOPB implements a voltage-mode PWM control architecture with internal frequency compensation and a fixed 150-kHz oscillator. Its feedback loop senses output voltage via an internal 1.23-V reference and adjusts duty cycle to maintain regulation across input voltages from 4.5 V to 40 V and load currents from 0.1 A to 0.5 A.
It features integrated thermal shutdown and two-stage current limiting: first-stage foldback reduces switching frequency under overload, second-stage shuts down the switch if junction temperature exceeds 150°C. Standby quiescent current is 200 μA typical, dropping to 85 μA in shutdown mode when the ON/OFF pin is pulled above 1.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for analog/digital subsystems without external resistor divider. |
| Max output current | 0.5 A DC - supports moderate-power microcontrollers, sensors, and interface ICs without external current boosting. |
| Input voltage range | 4.5 V to 40 V - enables direct regulation from unregulated 12-V, 24-V, or 36-V industrial supplies. |
| Switching frequency | 150 kHz ±15% - balances EMI performance and inductor size; compatible with low-cost, high-saturation-current toroidal or shielded drum-core inductors. |
| Quiescent current | 200 μA typical - minimizes no-load power loss in battery-backed or always-on systems. |
| Standby current | 85 μA typical - allows deep sleep modes via logic-level ON/OFF pin control without external enable circuitry. |
| Saturation voltage | 1.1 V max at 0.5 A - defines minimum dropout: requires VIN ≥13.1 V for full 12-V output under max load. |
| Feedback reference | 1.23 V internal - eliminates external resistors for fixed-output versions, reducing BOM count and layout sensitivity. |
Pinout & Package
LM2594M-12/NOPB is housed in an 8-pin surface-mount SOIC (D) package measuring 4.90 mm × 3.91 mm, optimized for thermal dissipation on standard 4-layer PCBs with exposed copper under the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No connection | Internally unconnected; must be soldered to PCB ground plane for mechanical stability and thermal conduction. |
| 4 | Feedback | Input to error amplifier; tied internally to 1.23-V reference - unused in fixed-12-V version but must remain unconnected per datasheet. |
| 5 | ON/OFF | TTL-compatible shutdown control; <1.3 V = ON, >1.3 V = OFF - enables system-level power sequencing without external logic. |
| 6 | Ground | Power and signal return path; connects to internal power switch source and error amplifier ground - requires low-impedance PCB trace to minimize noise coupling. |
| 7 | +VIN | Main input supply pin; accepts 4.5–40 V - requires local 68-μF tantalum or low-ESR electrolytic bypass capacitor within 5 mm. |
| 8 | Output | Internal power switch drain node; switches between VIN−VSAT and −0.5 V - connects to catch diode anode and inductor; demands minimal copper area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistors, reducing component count, layout complexity, and calibration drift over temperature. |
| 150-kHz fixed-frequency oscillator | Enables predictable EMI filtering design and consistent inductor sizing across production batches without frequency tuning. |
| TTL shutdown capability | Allows direct interfacing with microcontroller GPIO pins for controlled power-up/down sequencing without level-shifting circuitry. |
| Thermal shutdown + current limit | Provides self-protection during short-circuit, overtemperature, or excessive load conditions - prevents catastrophic failure without external supervision. |
| Requires only four external components | Needs only input capacitor, output capacitor, inductor, and catch diode - accelerates prototyping and reduces BOM validation effort. |
| Uses standard inductors | Compatible with widely available 100–150-μH, 1-A shielded inductors - avoids proprietary magnetics and simplifies supply chain sourcing. |
Applications
| Industrial Sensor Node Power | Embedded Controller Pre-regulator |
|---|---|
Use Scenario: Powering 3.3-V or 5-V microcontrollers, ADCs, and RS-485 transceivers from a 24-V factory bus. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, regulated 12-V intermediate rail for downstream LDOs or point-of-load converters. Use Value: Delivers 0.5-A continuous current with ±4% regulation across −40°C to +125°C ambient, enabling reliable operation in harsh environments without derating. | Use Scenario: Generating clean 12-V supply for linear regulators feeding sensitive analog circuitry (e.g., precision DACs or op-amps). IC Role / Device Role / Timing Role: Efficient preregulator stepping down 24-V or 36-V input before low-noise LDOs - reducing heat dissipation and improving PSRR. Use Value: 88% efficiency at 25-V input/0.5-A load lowers thermal load on downstream LDOs and extends board lifetime in sealed enclosures. |
| On-Card Distributed Power | Positive-to-Negative Converter |
Use Scenario: Local 12-V generation on dense PCBs where centralized power distribution causes IR drop or noise coupling. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator placed near high-current loads - minimizing trace inductance and improving transient response. Use Value: 8-pin SOIC footprint (4.9 × 3.9 mm) and four-external-component requirement enable placement directly beside SoC or FPGA power domains. | Use Scenario: Generating −12-V rail from +24-V input for op-amp biasing or legacy instrumentation interfaces. IC Role / Device Role / Timing Role: Inverting topology configuration using LM2594M-12/NOPB's internal switch and feedback reference - no external voltage reference needed. Use Value: Achieves −12-V output with ≤1.2-V saturation drop and built-in current limiting, eliminating need for discrete PNP/NPN stage or dedicated inverting controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594HVM-12/NOPB | Supports 4.5–60 V input (vs. 4.5–40 V); identical pinout, package, and electrical specs otherwise. | Required for 48-V telecom or automotive battery-supplied systems where input may exceed 40 V. | Select LM2594HVM-12/NOPB only if VIN can reach 48–60 V; otherwise LM2594M-12/NOPB offers same performance at lower cost. |
| LMR36506RNXR | 65-V input, 0.6-A synchronous buck; 2.5-MHz switching, integrated FETs, 3-mm × 2-mm WSON package. | Delivers higher efficiency (>90%) and smaller solution size but requires different layout, compensation, and external components. | Choose LMR36506RNXR for new designs needing >90% efficiency or space-constrained layouts; LM2594M-12/NOPB remains optimal for cost-sensitive, thermally robust, or legacy-compatible designs. |
Compared with LM2594HVM-12/NOPB, the LM2594M-12/NOPB trades 20-V input headroom for lower cost and identical thermal performance in 40-V-max systems; compared with LMR36506RNXR, it offers proven reliability and simpler design at the expense of efficiency and footprint - making it ideal for industrial equipment where long-term availability and ease of qualification matter most.
Availability
LM2594M-12/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, embedded controller pre-regulation, on-card distributed power, and positive-to-negative conversion requiring stable component supply and long-lifecycle support.
Supply support for LM2594M-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 expertise in high-reliability power conversion ICs.
The LM2594xx series was designed for cost-effective, robust DC-DC conversion in industrial, automotive, and telecom infrastructure - prioritizing simplicity, thermal resilience, and long-term manufacturability over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2594M-12/NOPB?
The absolute maximum input voltage for LM2594M-12/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 lifetime. The HV variant LM2594HVM-12/NOPB supports up to 60 V input and shares identical pinout and functionality except for this voltage rating.
Does LM2594M-12/NOPB require an external feedback resistor network?
No, LM2594M-12/NOPB does not require external feedback resistors. As a fixed-output version, it integrates the 1.23-V reference and internal resistor divider to deliver precisely 12 V. Pin 4 (Feedback) is internally connected and must be left unconnected in PCB layout - unlike the adjustable LM2594ADJ variant which requires external resistors.
Can LM2594M-12/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2594M-12/NOPB supports inverting operation by reconfiguring the ground and feedback connections per Figure 8-5 in the datasheet. It generates −12 V from a +24-V input using the same internal 1.23-V reference, with output current limited by input-output voltage sum (≤40 V). Diodes D1 and D3 are mandatory for stability and startup protection in this topology.
What is the thermal resistance (RθJA) of LM2594M-12/NOPB in SOIC package?
The junction-to-ambient thermal resistance (RθJA) for LM2594M-12/NOPB in the 8-pin SOIC (D) package is 150°C/W when mounted on a standard 4-layer JEDEC test board. This value assumes adequate copper pour under the package and proper via stitching; actual board-level RθJA will vary based on PCB layout, copper area, and airflow.
How does the ON/OFF pin function on LM2594M-12/NOPB?
The ON/OFF pin (Pin 5) provides TTL-compatible shutdown: pulling it below 1.3 V (referenced to GND) enables regulation, while pulling it above 1.3 V disables switching and reduces quiescent current to 85 μA. If unused, it may be tied directly to GND for permanent enable - no pull-up or pull-down resistors are required.
LM2594M-12/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2594M-12/NOPB FAQ
1.How can I place an order for LM2594M-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594M-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 LM2594M-12/NOPB reliable?
The price and inventory of LM2594M-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 LM2594M-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2594M-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594M-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594M-12/NOPB?
LM2594M-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594M-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 LM2594M-12/NOPB?
For technical support, including LM2594M-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594M-12/NOPB requirements.
6.How does Aetrix verify that LM2594M-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2594M-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 LM2594M-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2594M-12/NOPB?
All LM2594M-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2594M-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 LM2594M-12/NOPB part is unused and in its original packaging.
Return procedure for LM2594M-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2594M-12/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
