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Texas Instruments LM2574HVN-ADJ
- Part No.:
- LM2574HVN-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574HVN-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,324
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Product details
Overview
LM2574HVN-ADJ from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator in an 8-pin DIP package, featuring adjustable output (1.23V–37V), 52 kHz fixed-frequency operation, and internal current limiting and thermal shutdown. It replaces linear regulators in medium-power DC/DC conversion where efficiency and minimal external components are critical - e.g., industrial power rails feeding microcontrollers or analog sensors.
For engineers reviewing the LM2574HVN-ADJ datasheet, LM2574HVN-ADJ pinout, LM2574HVN-ADJ application, or LM2574HVN-ADJ equivalent, key selection considerations include its 60V max input rating (HV version), ±4% feedback voltage tolerance (1.23 V), 50 µA standby current under TTL shutdown, and compatibility with standard off-the-shelf inductors - all verified for continuous-mode buck designs up to 0.5A load.
Technical Context
The LM2574HVN-ADJ integrates a PWM controller, power switch, oscillator, and protection circuitry into a single IC. Its feedback loop uses a precision 1.23V reference applied to the FB pin, enabling output programming via two external resistors. The 52 kHz oscillator drives a fixed-duty-cycle topology with cycle-by-cycle current limiting and automatic thermal foldback.
It operates in continuous conduction mode by default, requiring only four external components: input capacitor, output capacitor, catch diode, and inductor. Input voltage range spans 4V to 60V, supporting wide-input industrial and automotive pre-regulation applications without external biasing or compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 0.5A DC load capability - sufficient for powering small microcontrollers, sensors, or logic rails without heatsinking beyond PCB copper. |
| Input Voltage Range | 4V to 60V - supports unregulated 24V/48V industrial buses and automotive battery inputs with transient margin. |
| Feedback Voltage | 1.23V ±4% over line/load/temperature - sets output accuracy when using R1/R2 divider; enables 1.23V–37V programmable range. |
| Oscillator Frequency | 52 kHz ±10% - fixed frequency simplifies EMI filtering and allows use of low-cost, high-saturation-current inductors. |
| Standby Current | 50 µA typical at shutdown - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Protection | Internal thermal shutdown with automatic recovery - prevents latch-up during overload or poor heatsinking conditions. |
| Current Limit | Peak switch current limit 0.7–1.8A - provides robust short-circuit protection while allowing inrush current for capacitive loads. |
Pinout & Package
LM2574HVN-ADJ is housed in an 8-pin plastic dual-in-line (DIP) package (NS package N08A), with Pin 5 internally connected to substrate for thermal enhancement and recommended to be soldered to PCB copper for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply connection | Accepts 4–60V unregulated DC; requires ≥22 µF input capacitor placed adjacent to minimize switching noise. |
| 2 (GND) | Power and signal ground reference | Common return for input/output paths and feedback network; must be tied to low-impedance PCB ground plane. |
| 3 (OUT) | Switch node / power switch drain | Drives external catch diode and inductor; carries pulsed high-current waveform - routing must minimize loop area. |
| 4 (FB) | Feedback input | Monitors output via resistor divider; 1.23V reference sets regulation point - sensitive to noise, so keep traces short. |
| 5 (NC) | No internal connection | Thermally connected to die substrate; solder to PCB copper pour to reduce θJA from 92°C/W to 72°C/W. |
| 6 (ON/OFF) | TTL-compatible enable/disable control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables with 50 µA standby current - supports remote power sequencing. |
| 7 (GND) | Second ground terminal | Provides separate low-noise return path for feedback and control circuitry; tie directly to Pin 2 ground at single point. |
| 8 (COMP) | Compensation node | Internal error amplifier output; no external components required - internal frequency compensation eliminates tuning effort. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.23V to 37V programmed via two external resistors - supports custom rail generation without stocking multiple fixed-voltage variants. |
| High-voltage input support | 60V maximum input rating - enables direct regulation from 48V telecom or industrial supplies without front-end buck converters. |
| Minimal external parts count | Only four components required: inductor, diode, input cap, output cap - reduces BOM cost and layout complexity vs. controller-based solutions. |
| Integrated protection | Cycle-by-cycle current limiting + thermal shutdown - eliminates need for external fault-handling circuitry in ruggedized designs. |
| Fixed-frequency operation | 52 kHz oscillator - enables predictable EMI spectrum and simplifies filter design compared to variable-frequency alternatives. |
Applications
| Industrial Power Supply | Automotive Pre-regulator |
|---|---|
|
Use Scenario: Generating stable 5V or 12V from noisy 24V factory bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient DC/DC conversion with built-in fault protection. Use Value: Eliminates need for bulky linear regulators and external current sense, reducing board space and thermal management overhead. |
Use Scenario: Converting vehicle battery voltage (9–16V nominal, up to 60V transients) to clean 3.3V for infotainment MCU core supply. IC Role / Device Role / Timing Role: High-input-voltage buck converter with shutdown control synchronized to ignition state. Use Value: Withstands load dump events up to 60V and delivers 0.5A with <50 µA quiescent current in sleep mode. |
| Embedded System Power Rail | Positive-to-Negative Converter |
|
Use Scenario: On-board 3.3V rail generation for ARM Cortex-M microcontrollers in edge IoT gateways with limited PCB area. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing discrete switcher designs requiring external PWM IC and MOSFET. Use Value: Achieves >77% efficiency at 0.5A with only four passive components - simplifies certification and reduces time-to-market. |
Use Scenario: Deriving −5V or −12V auxiliary supply from existing +12V rail in test equipment or analog signal conditioning circuits. IC Role / Device Role / Timing Role: Configured as inverting buck-boost converter using same external component set as buck mode. Use Value: Leverages identical inductor/diode/capacitor footprint - avoids dedicated inverting ICs and saves inventory SKUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVS-ADJ | Higher 3A output current, 52 kHz frequency, wider 4–60V input, but larger TO-220-5 package and higher quiescent current (10 mA vs. 5 mA). | Better suited for higher-load applications (>0.5A); less suitable for space-constrained DIP layouts. | Select LM2576HVS-ADJ only if load exceeds 0.5A or thermal headroom is marginal - otherwise LM2574HVN-ADJ offers lower system cost and smaller footprint. |
| TPS54202DDCR | 2A synchronous buck, 4.5–28V input, 500 kHz switching, integrated high-side/low-side FETs, but requires external compensation and has no HV input capability. | Designed for compact, high-efficiency 12V/24V-to-3.3V/5V conversion in consumer electronics - not rated for >40V operation. | Choose TPS54202DDCR for higher efficiency and smaller inductor size in ≤28V systems; avoid for 48V+ or legacy DIP-replacement designs. |
Compared with LM2576HVS-ADJ and TPS54202DDCR, the LM2574HVN-ADJ uniquely balances HV input tolerance (60V), DIP package compatibility, minimal external parts, and proven reliability in industrial environments - making it optimal for retrofit, cost-sensitive, or thermally constrained 0.5A buck applications.
Availability
LM2574HVN-ADJ is available at Aetrix Electronics and suitable for industrial automation power supplies, automotive body control modules, and embedded system power rails requiring stable component supply across extended temperature ranges (−40°C to +125°C) and long production lifecycles.
Supply support for LM2574HVN-ADJ 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 support, datasheets, and application resources for the SIMPLE SWITCHER™ product line.
The LM2574 series was designed specifically for cost-effective, easy-to-implement buck regulation in industrial, automotive, and instrumentation applications - emphasizing ruggedness, minimal external components, and wide-input-voltage operation.
FAQ
What is the maximum input voltage rating for the LM2574HVN-ADJ?
The LM2574HVN-ADJ supports a maximum input voltage of 60V, confirmed in the Absolute Maximum Ratings table and Operating Ratings section of the official TI datasheet (DS011394). This HV rating distinguishes it from the standard LM2574 (40V max) and enables direct regulation from 48V industrial or automotive supplies without pre-scaling.
How is the output voltage set on the LM2574HVN-ADJ?
The LM2574HVN-ADJ uses a resistor divider between VOUT and GND, connected to the FB pin, to set output voltage. With a precise 1.23V internal reference at FB, the formula is VOUT = 1.23V × (1 + R2/R1). R1 is typically 1kΩ–5kΩ; R2 is selected accordingly - e.g., 18.7kΩ for 24V output. Layout guidelines require short, noise-immune FB traces.
Does the LM2574HVN-ADJ require external compensation components?
No, the LM2574HVN-ADJ does not require external compensation. Its COMP pin (Pin 8) is internally compensated for stability with standard external components - confirmed in the Block Diagram (Figure 1) and "Features" list. This eliminates the need for loop compensation networks required by controller-only ICs.
What is the guaranteed output current capability of the LM2574HVN-ADJ?
The LM2574HVN-ADJ guarantees 0.5A DC output current across the full operating temperature range (−40°C to +125°C), as specified in the General Description and Electrical Characteristics tables. This rating assumes adequate PCB copper heatsinking - thermal resistance drops from 92°C/W to 72°C/W when Pin 5 is soldered to copper.
Can the LM2574HVN-ADJ be used in a buck-boost (inverting) configuration?
Yes, the LM2574HVN-ADJ can be configured as a positive-to-negative buck-boost converter, as explicitly listed in the Applications section of the datasheet. It uses the same inductor, diode, and capacitor as the buck configuration but rearranges connections to generate negative output voltages - e.g., −5V or −12V from a +12V input.
LM2574HVN-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2574HVN-ADJ FAQ
1.How can I place an order for LM2574HVN-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVN-ADJ 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 LM2574HVN-ADJ reliable?
The price and inventory of LM2574HVN-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVN-ADJ is usually 5 days.
3.What payment methods are accepted for LM2574HVN-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVN-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVN-ADJ?
LM2574HVN-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVN-ADJ 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 LM2574HVN-ADJ?
For technical support, including LM2574HVN-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVN-ADJ requirements.
6.How does Aetrix verify that LM2574HVN-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2574HVN-ADJ 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 LM2574HVN-ADJ meets industry standards.
7.What is the process for return or replacement of LM2574HVN-ADJ?
All LM2574HVN-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVN-ADJ, 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 LM2574HVN-ADJ part is unused and in its original packaging.
Return procedure for LM2574HVN-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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