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Texas Instruments LM2575MX-5.0
- Part No.:
- LM2575MX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575MX-5.0.pdf
- Description:
- IC REG BUCK 5V 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,750
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Product details
Overview
LM2575MX-5.0 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 5.0V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, 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 LM2575MX-5.0 datasheet, LM2575MX-5.0 pinout, LM2575MX-5.0 application, or LM2575MX-5.0 equivalent, key selection considerations include input voltage range (up to 40V), TO-263 package thermal performance (θJA = 37°C/W with 1 in² copper), 77% efficiency at 12VIN/1A, and TTL-compatible shutdown capability with 50 μA standby current.
Technical Context
The LM2575MX-5.0 implements a fixed-frequency PWM buck topology with internal NPN switch, feedback comparator, and 1.23V reference. Its 52 kHz oscillator enables use of standard off-the-shelf inductors (e.g., 330 μH for 5V output) and minimizes EMI compared to higher-frequency alternatives.
Control architecture includes cycle-by-cycle peak current limiting (2.2A typical), thermal shutdown activation at 150°C junction temperature, and TTL-level ON/OFF pin (VIH = 2.2V min, VIL = 1.0V max) enabling precise system-level power sequencing without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over 8–40V input, 0.2–1A load, −40°C to +125°C |
| Max Input Voltage | 40V - supports 24V nominal industrial rails with margin for transients |
| Switching Frequency | 52 kHz - enables use of low-cost, high-saturation-current inductors; reduces core loss vs. 100+ kHz ICs |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs without external pass devices |
| Efficiency | 77% at 12VIN/5VOUT/1A - cuts heat sink requirements versus linear regulators by >70% |
| Standby Current | 50 μA typical - enables low-power sleep modes in battery-backed systems |
| Thermal Resistance | θJA = 37°C/W with 1 in² PCB copper - allows full 1A operation without external heatsink under 50°C ambient |
Pinout & Package
LM2575MX-5.0 uses the 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring an exposed thermal pad for direct PCB copper connection to improve heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input | Voltage supply input | Accepts 4.75–40V DC; requires local 47–100 μF aluminum electrolytic bypass capacitor |
| 2: Output | Regulated 5.0V switching node | Drives external catch diode and output filter; connects to 330–470 μF output capacitor |
| 3: Ground | Power and signal reference | Must be connected to thermal pad and low-impedance ground plane; single-point grounding recommended |
| 4: Feedback | Output voltage sense | Internally tied to 5.0V output; not accessible on fixed-version parts - no external resistor required |
| 5: ON/OFF | Enable/disable control | TTL-compatible: <1.0V = ON, >2.2V = OFF; draws only 12 μA when active, 50 μA in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Protects against sustained overload or poor PCB thermal design by latching off above 150°C junction temperature |
| Cycle-by-cycle current limit | Clamps peak switch current at 2.2A typical, preventing inductor saturation and MOSFET failure during short-circuit events |
| Fixed 52 kHz oscillator | Eliminates need for external timing components; provides stable frequency across temperature and supply voltage |
| Requires only 4 external parts | Input cap, output cap, catch diode, and inductor - reduces BOM count and layout complexity versus controller-based solutions |
| TTL shutdown interface | Enables direct connection to microcontroller GPIO pins without level-shifting circuitry |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
|
Use Scenario: Converting 24V DC rail to stable 5V for PLC I/O modules operating in 0–70°C enclosures. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5V to MCU, ADCs, and digital isolators. Use Value: Eliminates need for oversized heatsinks; 77% efficiency keeps board temperature rise below 25°C at full load. |
Use Scenario: On-board power for ARM Cortex-M4-based edge sensor node with sleep/wake cycling. IC Role / Device Role / Timing Role: Main 5V supply with TTL shutdown synchronized to host processor's low-power state transitions. Use Value: 50 μA standby current extends battery life in duty-cycled applications; TO-263 thermal pad ensures reliability during burst-mode operation. |
| Test Equipment Front-End | Motor Drive Logic Supply |
|
Use Scenario: Providing clean 5V to analog front-end circuitry (op-amps, references) in portable DMMs. IC Role / Device Role / Timing Role: Pre-regulator feeding low-noise LDOs; operates at fixed 52 kHz to simplify EMI filtering. Use Value: Fixed frequency enables predictable noise placement; ±4% output tolerance meets precision measurement supply specs. |
Use Scenario: Generating isolated 5V logic supply from 48V bus in BLDC motor controller gate driver stage. IC Role / Device Role / Timing Role: High-reliability buck converter powering optocouplers and level shifters in noisy motor environments. Use Value: Thermal shutdown and current limit protect against gate drive faults; 40V max input accommodates 48V bus transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-5.0 | TO-220 through-hole package; θJA = 45°C/W (no heatsink), 65°C/W (minimal copper) | Suitable for prototyping or low-volume assemblies where manual soldering is preferred | Select when mechanical mounting constraints favor vertical heatsink attachment or socket-based testing |
| MP1584EN-LF-Z | 3A output, 1.5 MHz switching, adjustable output; requires external feedback resistors and more complex compensation | Better suited for space-constrained designs needing higher current or smaller magnetics | Choose only if 1A rating is insufficient or PCB area demands sub-3mm inductor footprint |
Compared with LM2575T-5.0, the LM2575MX-5.0 offers superior thermal performance in production SMT assembly; versus MP1584EN-LF-Z, it trades higher integration and lower EMI for reduced design complexity and proven field reliability in industrial environments.
Availability
LM2575MX-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, and motor drive logic circuits requiring stable component supply with long-term manufacturability.
Supply support for LM2575MX-5.0 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 is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in power management ICs.
The LM2575MX-5.0 belongs to TI's SIMPLE SWITCHER® family-designed specifically for cost-sensitive, high-reliability DC/DC conversion in industrial, automotive, and telecom infrastructure where ease of use and thermal robustness are critical.
FAQ
What is the maximum input voltage rating for the LM2575MX-5.0?
The LM2575MX-5.0 has an absolute maximum input voltage of 45V, but its specified operating range is 4.75V to 40V. Operation beyond 40V risks violating the guaranteed output regulation and thermal limits. The LM2575HV variant supports up to 60V input, but LM2575MX-5.0 is not rated for that range.
Does the LM2575MX-5.0 require an external feedback resistor network?
No. The LM2575MX-5.0 is a fixed-output version with internal feedback divider set for 5.0V. Pin 4 (Feedback) is internally connected and not accessible externally-no external resistors are needed, unlike the LM2575-ADJ variant. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy.
What thermal performance can be expected from the LM2575MX-5.0 in a typical PCB layout?
With 1 square inch of 2-oz copper connected to the exposed thermal pad, the LM2575MX-5.0 achieves θJA = 37°C/W. At 1A load and 25°C ambient, junction temperature rises ~37°C - well within the −40°C to +125°C operating range. No external heatsink is required under these conditions.
Can the LM2575MX-5.0 be used in a negative-output (buck-boost) configuration?
Yes - the LM2575MX-5.0 datasheet explicitly lists "Positive to Negative Converter (Buck-Boost)" as a supported application. When configured per Figure 32 in SNVS106E, it generates a regulated −5V output from a positive input, leveraging the same 1A switch and protection features as in buck mode.
What is the minimum output capacitance required for stable operation of the LM2575MX-5.0?
The LM2575MX-5.0 requires ≥330 μF aluminum electrolytic output capacitance for stable regulation and ≤1% ripple at full load. Lower values risk loop instability and excessive output voltage deviation during load transients. TI recommends 330–470 μF with ≤0.1Ω ESR for optimal performance.
LM2575MX-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 24-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):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
LM2575MX-5.0 FAQ
1.How can I place an order for LM2575MX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575MX-5.0 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 LM2575MX-5.0 reliable?
The price and inventory of LM2575MX-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575MX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2575MX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575MX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575MX-5.0?
LM2575MX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575MX-5.0 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 LM2575MX-5.0?
For technical support, including LM2575MX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575MX-5.0 requirements.
6.How does Aetrix verify that LM2575MX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2575MX-5.0 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 LM2575MX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2575MX-5.0?
All LM2575MX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575MX-5.0, 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 LM2575MX-5.0 part is unused and in its original packaging.
Return procedure for LM2575MX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575MX-5.0 Tags
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