My Inquiry
My Account
Texas Instruments LM2574HVMX-3.3
- Part No.:
- LM2574HVMX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVMX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,850
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2574HVMX-3.3 from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 3.3V output, 60V maximum input voltage, 52 kHz internal oscillator, ±4% output voltage tolerance, and integrated thermal shutdown and cycle-by-cycle current limiting. It serves as a high-efficiency replacement for linear regulators in industrial power supplies and embedded system rails.
For engineers reviewing the LM2574HVMX-3.3 datasheet, LM2574HVMX-3.3 pinout, LM2574HVMX-3.3 application, or LM2574HVMX-3.3 equivalent, key selection considerations include its HV-rated input range (up to 60V), DIP-compatible 14-pin wide-body SOIC package (M14B), 3.3V fixed output with guaranteed load regulation up to 0.5A, and TTL-compatible ON/OFF control with 50 µA standby current.
Technical Context
The LM2574HVMX-3.3 implements a fixed-frequency, current-mode buck topology with an internal NPN switch, feedback comparator, oscillator, and protection circuitry. Its 52 kHz switching frequency enables use of standard off-the-shelf inductors and minimizes EMI concerns in space-constrained designs.
It operates across −40°C to +125°C junction temperature, supports external shutdown via TTL-level ON/OFF pin (VIH ≥2.2 V, VIL ≤1.0 V), and delivers regulated 3.3V output with line regulation better than ±0.5% over 4.75–60V input and load regulation within ±1.5% over 0.1–0.5A load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over full temperature and load range - ensures stable logic rail for 3.3V microcontrollers and FPGAs. |
| Max Input Voltage | 60V - supports wide-input industrial, automotive, and telecom applications without external pre-regulation. |
| Output Current | Guaranteed 0.5A continuous - sufficient for powering multiple low-power ICs or single-core processors. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces filter component size vs. higher-frequency alternatives. |
| Efficiency | 72% at VIN=12V, IOUT=0.5A - significantly reduces thermal load vs. linear regulators, eliminating need for heatsinks on PCB copper. |
| Standby Current | 50 µA typical at OFF state - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Protection | Internal thermal shutdown - prevents damage during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
LM2574HVMX-3.3 is housed in a 14-lead wide-body surface-mount SOIC package (NS package code M14B), optimized for thermal performance with exposed pad grounding and 78°C/W junction-to-ambient thermal resistance using 4 in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply | Accepts 4.75–60V DC; requires local 22 µF electrolytic bypass capacitor. |
| 2 (GND) | Power ground | Main return path for switch current and feedback reference; connect to large copper pour. |
| 3 (OUT) | Switched output | Drives external catch diode and inductor; peak current capability 1.0A. |
| 4 (GND) | Power ground | Dedicated second ground pin to reduce ground bounce and improve stability. |
| 5 (ON/OFF) | Enable control | TTL-compatible shutdown input; <1.0V disables regulator, >2.2V enables operation. |
| 6 (GND) | Feedback ground | Separate analog ground for feedback network to minimize noise coupling. |
| 7 (FB) | Feedback sense | Not connected in fixed-output version; internally tied to output divider for 3.3V regulation. |
| 8–14 | No internal connection | Thermally conductive but electrically isolated pins; solder to PCB ground for enhanced heat transfer. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external resistor divider, reducing BOM count and layout sensitivity for standard logic rail generation. |
| 60V input rating | Enables direct connection to unregulated 48V telecom lines or 24V/36V industrial buses without front-end buck or Zener clamp. |
| 52 kHz switching | Permits use of low-DCR, high-current inductors (e.g., Pulse PE-52627, Renco RL-1284-330) with minimal core loss and audible noise. |
| TTL shutdown | Allows seamless integration with microcontroller GPIOs or system power sequencers without level-shifting circuitry. |
| Thermal + current protection | Provides fault resilience in harsh environments-no external circuitry needed for overtemperature or short-circuit recovery. |
Applications
| Industrial Power Supply | Embedded System Rail |
|---|---|
Use Scenario: Generating 3.3V from 24V or 48V factory floor power bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing isolated, efficient, and protected 3.3V rail. Use Value: Eliminates linear regulator heat dissipation (≥10W saved at 24V→3.3V/0.5A), enabling compact enclosure design without forced air cooling. | Use Scenario: Powering ARM Cortex-M4 microcontrollers and SPI peripherals in portable test equipment. IC Role / Device Role / Timing Role: Main system regulator delivering clean, stable 3.3V under dynamic load transients. Use Value: 50 µA standby current and fast transient response (<200 µs settling) extend battery life and maintain real-time operation during wake/sleep cycles. |
| Automotive Body Control | Telecom Line Card |
Use Scenario: Converting 12V vehicle battery (with load dump spikes up to 60V) to 3.3V for CAN transceivers and door module MCUs. IC Role / Device Role / Timing Role: High-voltage tolerant buck converter with built-in surge resilience. Use Value: Withstands ISO 7637-2 pulse 5a (75V/100ms) when combined with input TVS, avoiding need for external overvoltage clamping. | Use Scenario: Deriving 3.3V auxiliary rail from −48V telecom plant power using buck-boost topology. IC Role / Device Role / Timing Role: Core switching element in positive-to-negative converter configuration (buck-boost). Use Value: Enables cost-effective generation of isolated 3.3V from legacy −48V infrastructure using only four external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HV-3.3 | 1A output current, 52 kHz frequency, same 60V max input; larger thermal footprint required. | Higher current delivery for multi-rail systems or future-proofing; not drop-in due to different pinout and higher quiescent current (10 mA vs. 5 mA). | Select when >0.5A load margin or improved transient response is required; verify PCB layout compatibility. |
| TPS54302DDCR | 3A output, 2.5–22V input, 500 kHz switching, integrated MOSFETs; no external diode needed. | Higher efficiency (>90%) and smaller solution size; lacks HV input rating - requires pre-regulation for >22V inputs. | Choose for space-constrained, high-efficiency designs with input <22V; not suitable for direct 48V/60V interface. |
Compared with LM2574HVMX-3.3, LM2576HV-3.3 offers double the output current but demands more board area and higher idle power, while TPS54302DDCR delivers superior efficiency and integration at the cost of input voltage limitation - making LM2574HVMX-3.3 optimal for rugged, wide-input, cost-sensitive 0.5A applications.
Availability
LM2574HVMX-3.3 is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and proven reliability in extended temperature environments.
Supply support for LM2574HVMX-3.3 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 manufacturing continuity for the SIMPLE SWITCHER™ product line.
The LM2574HVMX-3.3 belongs to TI's SIMPLE SWITCHER™ family of integrated buck regulators, designed specifically for ease-of-use, minimal external component count, and robust operation in industrial and harsh-environment power conversion.
FAQ
What is the maximum input voltage rating for LM2574HVMX-3.3?
The LM2574HVMX-3.3 has a maximum input voltage rating of 60V, as specified in its Absolute Maximum Ratings table. This HV designation distinguishes it from the standard LM2574 series (45V max). The device operates continuously across 4.75V to 60V input, making it suitable for 48V industrial buses and automotive applications with load dump transients. Exceeding 60V risks permanent damage per datasheet limits.
Does LM2574HVMX-3.3 require an external feedback resistor network?
No, LM2574HVMX-3.3 does not require an external feedback resistor network. As a fixed-output variant, its internal resistor divider is factory-trimmed to deliver 3.3V ±4%. Pin 7 (FB) is internally connected and must remain unconnected in PCB layout. External resistors are only required for the adjustable versions (e.g., LM2574HVM-ADJ); adding them to LM2574HVMX-3.3 would disrupt regulation.
What package type is used for LM2574HVMX-3.3?
LM2574HVMX-3.3 uses a 14-lead wide-body surface-mount SOIC package designated as M14B by National Semiconductor. It features thermally enhanced construction with seven electrically isolated but thermally conductive pins (pins 8–14) intended to be soldered to PCB ground planes for improved heat dissipation. Thermal resistance is 78°C/W with 4 in² of 1 oz. copper.
Can LM2574HVMX-3.3 be used in buck-boost configurations?
Yes, LM2574HVMX-3.3 can be configured as a buck-boost converter to generate negative output voltages from positive inputs - a documented application in the datasheet (Section "Applications"). In this topology, the IC functions as a step-down controller driving an external switch and inductor, enabling generation of −3.3V from +12V or +24V supplies. Layout and component selection must follow Figure 2 and Application Hints for stability.
What is the typical efficiency of LM2574HVMX-3.3 at full load?
The typical efficiency of LM2574HVMX-3.3 is 72% at VIN = 12V and IOUT = 0.5A, as measured per the datasheet's Electrical Characteristics table. Efficiency varies with input voltage and load: it rises to ~88% at VIN = 15V/0.5A for 12V output variants, but remains ~72% for the 3.3V version under standard test conditions. Real-world efficiency depends on external component selection (inductor DCR, diode VF, capacitor ESR) and PCB thermal design.
LM2574HVMX-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for LM2574HVMX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVMX-3.3 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-3.3 reliable?
The price and inventory of LM2574HVMX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVMX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2574HVMX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVMX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVMX-3.3?
LM2574HVMX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVMX-3.3 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-3.3?
For technical support, including LM2574HVMX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVMX-3.3 requirements.
6.How does Aetrix verify that LM2574HVMX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2574HVMX-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LM2574HVMX-3.3?
All LM2574HVMX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVMX-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LM2574HVMX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2574HVMX-3.3 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…
