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Texas Instruments LM2574M-ADJ/NOPB
- Part No.:
- LM2574M-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574M-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,516
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Product details
Overview
LM2574M-ADJ/NOPB from Texas Instruments is a monolithic 0.5A step-down (buck) switching voltage regulator in SOIC-14 package, featuring adjustable output (1.23V–37V), 52 kHz fixed-frequency oscillator, internal current limiting, thermal shutdown, and TTL-compatible shutdown control. It replaces linear regulators in medium-power DC-DC conversion for industrial power supplies and embedded systems.
For engineers reviewing the LM2574M-ADJ/NOPB datasheet, LM2574M-ADJ/NOPB pinout, LM2574M-ADJ/NOPB application, or LM2574M-ADJ/NOPB equivalent, key selection criteria include output adjustability range, 40V max input voltage, 0.5A guaranteed load current, thermal resistance (78°C/W with 4 in² copper), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2574M-ADJ/NOPB integrates a PWM controller, power switch, oscillator, error amplifier, and protection circuitry into a single SOIC-14 IC. Its feedback loop uses an external resistor divider referenced to a precise 1.230V ±1.3% internal bandgap reference, enabling stable regulation across line and load variations.
Operation relies on fixed-frequency (52 kHz) current-mode control with cycle-by-cycle peak current limiting (1.0A typical) and automatic frequency reduction under overload. Shutdown mode draws only 50 µA typical quiescent current, and the device sustains operation from −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 0.5A continuous load capability without external heatsink |
| Input Voltage Range | 4V to 40V - supports wide-input industrial and automotive battery-derived rails |
| Output Voltage Range | Adjustable 1.23V to 37V via external resistor divider - enables flexible rail generation |
| Oscillator Frequency | 52 kHz fixed - simplifies EMI filtering and allows use of low-cost, high-current inductors |
| Feedback Reference | 1.230V ±1.3% at 25°C, ±1.9% over full temperature/load range - sets output accuracy baseline |
| Thermal Resistance θJA | 78°C/W with 4 in² PCB copper - defines safe power dissipation limit at ambient |
| Shutdown Current | 50 µA typical - enables ultra-low-power standby in battery-backed systems |
Pinout & Package
LM2574M-ADJ/NOPB is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package (NS package code M14B), with exposed pad for enhanced thermal performance. Pin numbering follows standard SOIC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Primary DC input connection; must be bypassed with ≥22 µF electrolytic capacitor |
| 2 (GND) | Power Ground | Common return for input/output capacitors, inductor, and diode; connects to thermal pad |
| 3 (OUT) | Switch Node | Drives external catch diode and inductor; carries pulsed high-current switching waveform |
| 4 (FB) | Feedback Input | Senses output voltage via resistor divider; high-impedance (50 nA bias) for precision regulation |
| 5 (ON/OFF) | Shutdown Control | TTL-compatible logic input; <1.0V disables regulator, >2.2V enables operation |
| 6–14 | No Connect / Thermal Pad | Pins 6–13 are NC; Pin 14 is thermal pad tied to GND - critical for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Protection | Cycle-by-cycle current limiting + thermal shutdown prevent damage during overload or short-circuit |
| Minimal External Parts | Only four components required: inductor, catch diode, input cap, output cap - reduces BOM count and layout complexity |
| Fixed-Frequency Operation | 52 kHz oscillator enables predictable EMI spectrum and simplifies filter design vs. variable-frequency alternatives |
| High Efficiency | Up to 77% at 5V/0.5A (VIN=12V) - minimizes heat generation and extends battery life |
| Standard Inductor Compatibility | Optimized for off-the-shelf 330 µH–1000 µH inductors (e.g., Pulse PE-52627, Renco RL-1284-330) - accelerates design cycle |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
Use Scenario: Generating 12V/0.5A from a 24V industrial bus for PLC I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC output with built-in fault protection. Use Value: Eliminates need for external current sense or thermal monitoring; 78°C/W θJA enables convection-only cooling on standard FR4. | Use Scenario: Deriving 3.3V for microcontroller core supply from a 12V board-level rail. IC Role / Device Role / Timing Role: Adjustable step-down converter configured via 1% metal-film resistors for tight output tolerance. Use Value: 1.23V reference tolerance (±1.3%) ensures output stays within ±4% over line/load/temperature - meets MCU VDD spec. |
| Battery-Powered Instrumentation | Legacy Linear Regulator Replacement |
Use Scenario: Powering a portable data logger with Li-ion (3.0–4.2V) and 9V alkaline inputs. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting both chemistries while maintaining 5V output. Use Value: 50 µA shutdown current extends shelf life; 4V minimum input enables operation down to near-dead battery voltage. | Use Scenario: Upgrading a 7805-based 5V supply in an aging test equipment chassis. IC Role / Device Role / Timing Role: Drop-in efficiency upgrade replacing TO-220 linear regulator without PCB redesign. Use Value: 77% efficiency at 5V/0.5A reduces dissipation from 2.5W (linear) to <0.6W - eliminates heatsink requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575M-ADJ/NOPB | 1A output current, 52 kHz, same SOIC-14 package, higher IQ (10 mA active) | Supports higher load currents but requires larger inductor and diode | Select when >0.5A output is needed and board space allows component upgrades |
| TPS54202DR | 2A synchronous buck, 4.5–28V input, 500 kHz, integrated high/low-side FETs, smaller 8-pin SOIC | Higher efficiency (>90%), no external diode, but requires more complex compensation | Prefer for new designs needing higher density and efficiency; not drop-in compatible |
Compared with LM2575M-ADJ/NOPB, LM2574M-ADJ/NOPB offers lower cost and simpler magnetics for ≤0.5A loads; versus TPS54202DR, it trades higher board area and lower efficiency for proven reliability, minimal external parts, and straightforward layout - ideal for cost-sensitive industrial upgrades.
Availability
LM2574M-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rail generation, battery-powered instrumentation, and legacy linear regulator replacements requiring stable component supply and long-term manufacturability.
Supply support for LM2574M-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 the SIMPLE SWITCHER™ portfolio as a cornerstone of its analog power management solutions.
The LM2574 series was designed specifically for cost-sensitive, medium-power DC-DC conversion where simplicity, reliability, and minimal external components outweigh the need for highest efficiency or smallest footprint.
FAQ
What is the maximum input voltage rating for LM2574M-ADJ/NOPB?
The LM2574M-ADJ/NOPB has a maximum input voltage rating of 40V. This is specified in the Absolute Maximum Ratings table and applies across the full operating temperature range. Exceeding 40V risks permanent damage. For higher input voltages up to 60V, the HV variant LM2574HV-M-ADJ must be used instead.
How do I set the output voltage of LM2574M-ADJ/NOPB?
The output voltage of LM2574M-ADJ/NOPB is set using two external resistors (R1 and R2) forming a voltage divider from VOUT to FB to GND. The formula is VOUT = 1.23V × (1 + R2/R1). R1 is typically 1kΩ–5kΩ; R2 is calculated accordingly. For example, to achieve 12V output, R2 ≈ 8.84kΩ with R1 = 1kΩ. Use 1% metal-film resistors for best stability.
Does LM2574M-ADJ/NOPB require an external catch diode?
Yes, LM2574M-ADJ/NOPB requires an external Schottky or fast-recovery catch diode connected between the OUT pin and GND. This diode provides the return path for inductor current during the switch-off phase. Recommended parts include MBR150 (50V, 1A) or SR104 (40V, 1A). Omitting the diode will cause catastrophic failure due to voltage spikes.
What is the thermal performance of LM2574M-ADJ/NOPB on a standard PCB?
With 4 in² of 1 oz. copper connected to the thermal pad (Pin 14), LM2574M-ADJ/NOPB achieves θJA = 78°C/W. At 0.5A output and 12V input, typical power dissipation is ~0.6W, resulting in ~47°C junction rise above ambient. Adequate copper area eliminates need for external heatsinks in most industrial environments.
Can LM2574M-ADJ/NOPB be synchronized to an external clock?
No, LM2574M-ADJ/NOPB does not support external clock synchronization. Its 52 kHz oscillator is fully internal and fixed-frequency. Synchronization capability is not present in the architecture - the ON/OFF pin only enables/disables operation. For sync-capable alternatives, consider TI's TPS54x02 series or newer SIMPLE SWITCHER devices like LM5116.
LM2574M-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
LM2574M-ADJ/NOPB FAQ
1.How can I place an order for LM2574M-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574M-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 LM2574M-ADJ/NOPB reliable?
The price and inventory of LM2574M-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 LM2574M-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574M-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574M-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574M-ADJ/NOPB?
LM2574M-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574M-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 LM2574M-ADJ/NOPB?
For technical support, including LM2574M-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574M-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2574M-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574M-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 LM2574M-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574M-ADJ/NOPB?
All LM2574M-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574M-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 LM2574M-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2574M-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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