My Inquiry
My Account
Texas Instruments LM2574MX-ADJ/NOPB
- Part No.:
- LM2574MX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574MX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:952
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2574MX-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) switching voltage regulator IC delivering up to 0.5A output current with adjustable output voltage from 1.23V to 37V, ±4% tolerance over line and load, 52 kHz fixed-frequency operation, and internal thermal shutdown and cycle-by-cycle current limiting - used in embedded power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2574MX-ADJ/NOPB datasheet, LM2574MX-ADJ/NOPB pinout, LM2574MX-ADJ/NOPB application, or LM2574MX-ADJ/NOPB equivalent, key selection criteria include feedback voltage accuracy (1.23 V ±1.3%), ON/OFF control interface (TTL-compatible), saturation voltage (0.9 V typ at 0.5 A), standby current (50 µA typ), and thermal resistance (78 °C/W for M package).
Technical Context
The LM2574MX-ADJ/NOPB integrates a PWM controller, power switch, oscillator, and protection circuitry into a single SOIC-14 package. It operates in continuous or discontinuous conduction mode, uses external feedback resistors to set output voltage, and relies on a catch diode, inductor, and input/output capacitors for regulation.
Its 52 kHz fixed-frequency oscillator enables predictable EMI filtering and simplifies inductor selection; internal compensation eliminates need for external compensation networks. The device enters low-power standby mode when the ON/OFF pin is pulled high, reducing quiescent current to 50 µA while maintaining full fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 0.5 A continuous - supports mid-power loads without external pass devices. |
| Feedback Voltage | 1.23 V ±1.3% - sets output via resistor divider; determines accuracy of programmable VOUT. |
| Oscillator Frequency | 52 kHz ±10% - fixed frequency enables stable loop design and predictable filter sizing. |
| Saturation Voltage | 0.9 V typical at 0.5 A - limits conduction loss and impacts minimum dropout capability. |
| Standby Current | 50 µA typical - enables low-power shutdown without auxiliary circuitry. |
| Thermal Resistance | 78 °C/W (junction-to-ambient, 4-in² copper) - defines PCB copper area needed for thermal management at full load. |
| Input Voltage Range | 4–40 V - supports wide industrial input rails including 5 V, 12 V, 24 V, and 36 V systems. |
Pinout & Package
LM2574MX-ADJ/NOPB is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package (TI package code M14B), with exposed pad for thermal enhancement. Pin numbering follows standard SOIC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Primary DC input connection; accepts 4–40 V; requires local 22 µF bypass capacitor. |
| 2 (GND) | Power Ground | Common return for input, output, and internal circuits; must be low-inductance connection. |
| 3 (OUT) | Switch Node | Drives external catch diode and inductor; carries pulsed high-current switching waveform. |
| 4 (FB) | Feedback Input | High-impedance input sensing output voltage via resistor divider; 1.23 V reference sets VOUT. |
| 5 (ON/OFF) | Shutdown Control | TTL-compatible logic input; high = shutdown (50 µA IQ); low = active regulation. |
| 6–14 | No Connect / Thermal Pad | Pins 6–13 are NC; Pin 14 is internally connected to exposed thermal pad - must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 1.23 V to 37 V - enables single BOM for multiple output voltages using two external resistors. |
| Internal Protection | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload or short-circuit without external sensing. |
| Fixed-Frequency Operation | 52 kHz oscillator - simplifies EMI filter design and avoids audible noise in sensitive applications. |
| Minimal External Parts | Only four components required - inductor, catch diode, input cap, output cap - reduces BOM cost and layout complexity. |
| Efficiency Optimization | Typical 77% at 5 V/0.5 A - reduces heat generation vs. linear regulators; PCB copper traces serve as primary heatsink. |
Applications
| Industrial Power Supplies | Embedded Microcontroller Boards |
|---|---|
Use Scenario: Distributed 24 V rail powering isolated sensor nodes and actuators in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V input to 5 V or 3.3 V for microcontrollers, ADCs, and digital I/O. Use Value: High efficiency (≥77%) minimizes thermal buildup in sealed enclosures; 40 V max input accommodates transient surges per IEC 61000-4-5. | Use Scenario: On-board power conversion for ARM Cortex-M or RISC-V development boards with variable peripheral voltage requirements. IC Role / Device Role / Timing Role: Adjustable-output regulator supplying configurable core/peripheral voltages from USB or wall adapter inputs. Use Value: 1.23 V feedback reference enables precise VOUT setting across 1.23–37 V range; SOIC-14 footprint supports compact, manufacturable layouts. |
| POS Terminal Power Management | Legacy Equipment Retrofit |
Use Scenario: Powering display, printer, and payment modules in point-of-sale terminals operating from 12 V battery or adapter. IC Role / Device Role / Timing Role: Step-down regulator delivering stable 5 V and 3.3 V rails under dynamic load changes during transaction processing. Use Value: 0.5 A output current handles peak loads from thermal printers; TTL shutdown allows software-controlled power sequencing. | Use Scenario: Replacing obsolete linear regulators (e.g., 7805) in aging test equipment to reduce heat and improve reliability. IC Role / Device Role / Timing Role: Drop-in efficiency upgrade replacing three-terminal regulators with identical pin-compatible footprint (with minor layout adaptation). Use Value: Eliminates need for heatsinks; 52 kHz switching enables use of standard off-the-shelf inductors (e.g., Pulse PE-52627) and Schottky diodes (e.g., MBR150). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575MX-ADJ/NOPB | 1.0 A output current; 52 kHz frequency; higher quiescent current (11 mA vs. 5 mA) | Higher load capacity but larger thermal footprint; less suitable for space-constrained 0.5 A designs | Select when >0.5 A output is required and board area permits larger thermal solution. |
| TPS54202DRCT | 2 A output; 500 kHz switching; integrated MOSFETs; requires external compensation | Enables smaller magnetics and faster transient response but increases design complexity and component count | Choose for higher efficiency at light loads or compact designs where 500 kHz operation is acceptable. |
Compared with LM2575MX-ADJ/NOPB, LM2574MX-ADJ/NOPB offers lower output current but reduced thermal demand and simpler layout; versus TPS54202DRCT, it trades higher integration for lower design overhead and proven stability with minimal external parts.
Availability
LM2574MX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded microcontroller boards, and legacy equipment retrofit requiring stable component supply, long-lifecycle support, and consistent parametric performance.
Supply support for LM2574MX-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 acquired National Semiconductor in 2011 and maintains full technical and supply chain support for the SIMPLE SWITCHER™ product family.
The LM2574MX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER™ buck regulator series, designed specifically for cost-sensitive, medium-power DC/DC conversion where ease of design, reliability, and minimal external components are prioritized over ultra-high efficiency or ultra-small size.
FAQ
What is the minimum input voltage required for stable operation of the LM2574MX-ADJ/NOPB?
The LM2574MX-ADJ/NOPB requires a minimum input voltage of 4 V to maintain regulation. This value accounts for internal dropout losses and ensures the internal switch and control circuitry remain functional. Below 4 V, the device may cease switching or fail to regulate - confirmed by absolute maximum ratings and operating conditions tables in TI's official datasheet DS011394.
Can the LM2574MX-ADJ/NOPB be used in discontinuous conduction mode (DCM)?
Yes, the LM2574MX-ADJ/NOPB supports both continuous and discontinuous conduction modes. DCM occurs naturally at light loads when inductor current falls to zero within each switching cycle. The device remains stable and protected in DCM, and its 52 kHz fixed frequency ensures predictable behavior - verified in Typical Performance Characteristics and Application Hints sections of the TI datasheet.
What is the recommended inductor value for a 12 V input to 5 V/0.5 A output using the LM2574MX-ADJ/NOPB?
For 12 V input to 5 V/0.5 A output, TI's LM2574HV-5.0 Inductor Selection Guide (Figure 5 in DS011394) specifies a 330 µH inductor. Pulse Engineering PE-52627, Renco RL-1284-330, or NPI NP5920/5921 are validated options rated for ≥0.75 A DC and 52 kHz operation - all confirmed in the official datasheet's Inductor Selection by Manufacturer's Part Number table.
Does the LM2574MX-ADJ/NOPB require an external compensation network?
No, the LM2574MX-ADJ/NOPB includes internal frequency compensation. No external compensation components are needed - explicitly stated in the General Description and confirmed in the Test Circuit diagrams (Figures 11 and 12) of TI's DS011394 datasheet. This simplifies design and improves stability across operating conditions.
How does the ON/OFF pin function on the LM2574MX-ADJ/NOPB?
The ON/OFF pin (Pin 5) provides TTL-compatible shutdown control: pulling it high (≥2.2 V) disables switching and reduces quiescent current to 50 µA typical; pulling it low (<1.2 V) enables regulation. Logic thresholds and leakage currents are specified in the Electrical Characteristics table - VIH min = 2.2 V, VIL max = 1.2 V, ISTBY = 50 µA - all measured and guaranteed per TI DS011394.
LM2574MX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-SOIC (0.295", 7.50mm 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):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 500mA
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LM2574MX-ADJ/NOPB FAQ
1.How can I place an order for LM2574MX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574MX-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 LM2574MX-ADJ/NOPB reliable?
The price and inventory of LM2574MX-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 LM2574MX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574MX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574MX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574MX-ADJ/NOPB?
LM2574MX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574MX-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 LM2574MX-ADJ/NOPB?
For technical support, including LM2574MX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574MX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2574MX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574MX-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 LM2574MX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574MX-ADJ/NOPB?
All LM2574MX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574MX-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 LM2574MX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2574MX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2574MX-ADJ/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…
