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Texas Instruments LM2574HVMX-15
- Part No.:
- LM2574HVMX-15
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVMX-15.pdf
- Description:
- IC REG BUCK 15V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,515
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Product details
Overview
LM2574HVMX-15 from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 15V output, 60V maximum input voltage, 52 kHz internal oscillator, ±4% output voltage tolerance, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2574HVMX-15 datasheet, LM2574HVMX-15 pinout, LM2574HVMX-15 application, or LM2574HVMX-15 equivalent, key selection criteria include input voltage range (up to 60V), guaranteed 0.5A load capability, fixed 15V output accuracy, thermal protection behavior, and compatibility with standard off-the-shelf 330 µH inductors per TI's design guidelines.
Technical Context
The LM2574HVMX-15 implements a fixed-frequency, current-mode buck topology with an internal NPN switch, feedback comparator, oscillator, and protection circuitry. Its 52 kHz switching frequency balances EMI control and inductor size, while the 93% minimum duty cycle enables operation down to ~18V input for 15V output.
It uses a single-resistor feedback network (internal for fixed versions) and requires only four external components: input capacitor, output capacitor, catch diode, and power inductor. Standby current is 50 µA typical via TTL-compatible ON/OFF pin, enabling low-power system control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full line/load/temperature range - ensures stable rail for analog sensors or logic interfaces without external resistor network. |
| Max Input Voltage | 60 V - supports wide-input industrial, automotive, or telecom applications without pre-regulation. |
| Output Current | Guaranteed 0.5 A - sufficient for powering microcontrollers, op-amps, or small FPGAs directly from unregulated DC sources. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current toroidal or bobbin-core inductors (e.g., Pulse PE-52627). |
| Efficiency | 88% at VIN = 18 V, IOUT = 0.5 A - reduces thermal load on PCB; copper traces serve as primary heatsink. |
| Quiescent Current | 5 mA typical - maintains regulation under light loads without significant standby loss. |
| Standby Current | 50 µA typical with ON/OFF pin high - enables deep-sleep modes in battery-backed systems. |
Pinout & Package
LM2574HVMX-15 is supplied in a 14-lead wide-body surface-mount (WM) package (NS package code M14B), thermally enhanced for high-power density mounting with exposed pad soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 18–60 V DC; requires ≥22 µF low-ESR aluminum electrolytic bypass capacitor placed within 5 mm. |
| 2 (GND) | Power Ground | Main return path for switch current and feedback reference; must connect to large copper pour for thermal and noise control. |
| 3 (OUT) | Switch Node | Drives external catch diode anode and inductor; high dv/dt node requiring short, direct routing to minimize EMI. |
| 4 (GND) | Power Ground | Second ground pin for improved thermal conduction and reduced ground impedance. |
| 5 (ON/OFF) | Enable Control | TTL-compatible shutdown input; <1.0 V disables regulator (50 µA standby), >2.2 V enables operation. |
| 6 (GND) | Power Ground | Third ground pin reinforcing thermal and current return path. |
| 7 (GND) | Power Ground | Fourth ground pin; all GND pins must be tied together and connected to thermal pad. |
| 8 (GND) | Power Ground | Fifth ground pin; critical for thermal performance-thermal pad beneath package must be soldered to ≥4 in² copper area. |
| 9 (GND) | Power Ground | Sixth ground pin; ensures low-inductance return for high-frequency switch currents. |
| 10 (GND) | Power Ground | Seventh ground pin; part of unified ground plane strategy for EMC compliance. |
| 11 (GND) | Power Ground | Eighth ground pin; supports thermal dissipation up to 78 °C/W junction-to-ambient (with 4 in² copper). |
| 12 (GND) | Power Ground | Ninth ground pin; minimizes voltage drop during peak 1.0 A current limit events. |
| 13 (GND) | Power Ground | Tenth ground pin; provides redundant paths for fault-current discharge during thermal shutdown. |
| 14 (FB) | Feedback (N/C) | No internal connection; left unconnected on fixed-output versions-must not be routed or loaded. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Thermal Shutdown | Activates at ~150°C junction temperature and holds OFF until safe cooldown-prevents permanent damage during overload or poor heatsinking. |
| Cycle-by-Cycle Current Limit | Clips peak switch current at 0.65–1.8 A depending on temperature-enables robust short-circuit survival without external sensing. |
| Fixed 52 kHz Oscillator | Eliminates need for external timing components and simplifies EMI filtering design around predictable fundamental frequency. |
| TTL-Compatible Enable Pin | Supports direct interfacing with microcontroller GPIOs or logic-level sequencers without level-shifting circuitry. |
| High Efficiency at Full Load | 88% efficiency at 18 V input / 15 V @ 0.5 A reduces board heating and eliminates need for dedicated heatsinks in most applications. |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
Use Scenario: Generating stable 15V rail from 24V truck battery (18–32V range) to power solenoid drivers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 15V supply with input transient tolerance up to ±60V. Use Value: Eliminates need for discrete transistor-based linear pre-regulators, reducing component count and improving thermal reliability in under-hood environments. | Use Scenario: On-card 15V supply for HVAC actuators and window lift controllers in 12V vehicle architectures with load-dump protection. IC Role / Device Role / Timing Role: High-voltage tolerant step-down converter handling ISO 7637-2 pulse 5a (75V/100ms) without latch-up or damage. Use Value: Enables direct connection to battery rail without external TVS or LDO pre-regulator-reducing BOM cost and footprint by >30%. |
| Telecom Remote Radio Units | Test & Measurement Equipment |
Use Scenario: Converting -48V telecom supply (via polarity-inverted buck-boost) to +15V for op-amp biasing and ADC reference circuits. IC Role / Device Role / Timing Role: Core switching regulator in non-isolated positive-to-negative converter topology using external diode and inductor. Use Value: Delivers clean 15V rail with <1% ripple (with 220 µF/25V output cap) meeting EN 55022 Class B conducted emission limits. | Use Scenario: Bench power module supplying 15V to analog front-end circuits in portable oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-noise LDOs that generate precision ±15V rails for op-amp stages. Use Value: Reduces heat generation vs. linear solutions-enabling fanless enclosure design and stable long-term calibration performance. |
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-15 | Higher 3A output current, 52 kHz frequency, wider 60V input, but larger SOIC-16 package and higher quiescent current (10 mA). | Preferred where higher load margin or future scalability to >0.5A is required; less suitable for space-constrained layouts. | Select LM2576HVS-15 if system load may exceed 0.5A or if additional headroom for aging derating is needed. |
| TPS54318RTER | 3A synchronous buck, 2.95–6V input, 1.2–15V adjustable output, 2.5 MHz switching-requires external compensation and has no HV input capability. | Only viable in low-input-voltage systems (<6V); incompatible with 18–60V industrial inputs required by LM2574HVMX-15. | Choose TPS54318RTER only for compact, high-efficiency designs powered from 5V rails-not as a direct replacement for LM2574HVMX-15. |
Compared with LM2576HVS-15 and TPS54318RTER, the LM2574HVMX-15 offers optimal balance of high-voltage resilience, minimal external parts, and proven thermal robustness in legacy industrial designs-making it preferred where input exceeds 6V and layout simplicity is prioritized over peak efficiency or current headroom.
Availability
LM2574HVMX-15 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote units, and test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2574HVMX-15 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 SPICE models for the SIMPLE SWITCHER™ product line.
The LM2574HVMX-15 belongs to TI's SIMPLE SWITCHER™ family of monolithic buck regulators, designed specifically for engineers needing rugged, easy-to-use DC/DC conversion in harsh environments without complex loop compensation.
FAQ
What is the maximum input voltage rating for the LM2574HVMX-15?
The LM2574HVMX-15 has an absolute maximum input voltage rating of 63 V and a recommended operating maximum of 60 V. This high-voltage capability allows direct connection to 48 V telecom systems, 24 V industrial buses with transients, or automotive batteries during load dump events. Operation above 60 V risks permanent damage even if within the 63 V absolute max limit.
Does the LM2574HVMX-15 require an external feedback resistor network?
No, the LM2574HVMX-15 does not require external feedback resistors because it is a fixed-output version with internal resistor divider set to 15 V. Pin 14 (FB) is internally connected and must remain unconnected-routing or loading this pin will disrupt regulation. Only adjustable versions (e.g., LM2574HV-ADJ) use external R1/R2 networks.
What inductor value is recommended for the LM2574HVMX-15 at 0.5A load?
Texas Instruments recommends a 330 µH inductor for the LM2574HVMX-15 operating at full 0.5 A load, such as Pulse Engineering PE-52627 or Renco RL-1284-330-43. This value ensures continuous conduction mode, optimal efficiency (~88%), and compliance with the inductor selection guide in the official datasheet (Figure 7). Lower values risk discontinuous operation and increased ripple.
How does the ON/OFF pin function on the LM2574HVMX-15?
The ON/OFF pin (Pin 5) of the LM2574HVMX-15 provides TTL-compatible enable control: driving it below 1.0 V disables the regulator and reduces quiescent current to 50 µA typical, while pulling it above 2.2 V enables normal operation. The pin draws only 12 µA typical when enabled and 30 µA max when disabled-making it ideal for microcontroller-driven power sequencing in battery-powered systems.
Can the LM2574HVMX-15 be used in a buck-boost configuration?
Yes, the LM2574HVMX-15 can be used in a non-isolated buck-boost (inverting) configuration to generate negative output voltages from positive inputs, as documented in TI's application notes. In this topology, the IC regulates the magnitude of the negative rail (e.g., −15 V) using the same 330 µH inductor and Schottky catch diode-but the output ground becomes the input-side reference, requiring careful isolation of feedback and load connections.
LM2574HVMX-15 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:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- 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
LM2574HVMX-15 FAQ
1.How can I place an order for LM2574HVMX-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVMX-15 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 LM2574HVMX-15 reliable?
The price and inventory of LM2574HVMX-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVMX-15 is usually 5 days.
3.What payment methods are accepted for LM2574HVMX-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVMX-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVMX-15?
LM2574HVMX-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVMX-15 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 LM2574HVMX-15?
For technical support, including LM2574HVMX-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVMX-15 requirements.
6.How does Aetrix verify that LM2574HVMX-15 is sourced from the original manufacturer or authorized distributors?
All LM2574HVMX-15 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 LM2574HVMX-15 meets industry standards.
7.What is the process for return or replacement of LM2574HVMX-15?
All LM2574HVMX-15 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVMX-15, 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 LM2574HVMX-15 part is unused and in its original packaging.
Return procedure for LM2574HVMX-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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