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onsemi LM2575T-005
- Part No.:
- LM2575T-005
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
-
LM2575T-005.pdf
- Description:
- IC REG SW 1A 5V STEPDOWN TO220-5
- Quantity:
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Inventory:2,645
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Product details
Overview
LM2575T-005 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 5.0 V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It serves as a high-efficiency primary DC-DC converter in industrial power supplies and embedded system rails.
For engineers reviewing the LM2575T-005 datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (4.75–40 V), no-heat-sink operation at 1.0 A under typical conditions, TTL-compatible ON/OFF control, and compatibility with standard off-the-shelf inductors (e.g., 330 µH).
Technical Context
The LM2575T-005 implements a voltage-mode controlled buck topology with an internal 1.0 A NPN switch, 1.23 V bandgap reference, and error amplifier driving a 52 kHz fixed-frequency oscillator. Its feedback loop senses output voltage directly at Pin 4 (Feedback) for fixed-output versions via internal resistor divider.
Protection architecture includes cycle-by-cycle current limiting (typ. 2.3 A peak), thermal shutdown (TJ ≥ 150°C), and low-power standby mode (80 µA quiescent current) activated by logic-high signal on Pin 5 (ON/OFF). The device operates across −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line (8.0–40 V), load (0.2–1.0 A), and temperature (−40°C to +125°C) range - ensures stable rail without external resistors. |
| Max Output Current | 1.0 A continuous - supports moderate-power microcontrollers, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 4.75 V to 40 V - enables direct use with 12 V/24 V industrial buses, automotive batteries (with transient protection), and wide-range unregulated supplies. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current toroidal or drum-core inductors; avoids audible noise. |
| Efficiency | 77% typ. at 12 VIN, 5 V/1.0 A - reduces thermal load vs. linear regulators; often eliminates need for heatsink in TO-220 package. |
| Standby Quiescent Current | 80 µA typ. at 25°C when ON/OFF pin = 5.0 V - enables low-power system sleep modes without disconnecting input supply. |
| Saturation Voltage | 1.0 V typ. at IOUT = 1.0 A - defines minimum dropout: VIN(MIN) = VOUT + VSAT + VF(D1) ≈ 5.0 + 1.0 + 0.4 = 6.4 V. |
Pinout & Package
LM2575T-005 uses the TO-220-5 (Case 314D) package with heatsink surface electrically connected to Pin 3 (GND). Pin 1 is Vin, Pin 2 is Output (switch emitter), Pin 3 is GND, Pin 4 is Feedback (internally tied to fixed 5.0 V divider), and Pin 5 is ON/OFF (TTL-compatible enable).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF) placed adjacent to pin to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ≤1.2 V at 1.0 A defines conduction loss; PCB copper area must be minimized to reduce EMI coupling. |
| 3 - GND | Circuit ground reference | Common return for input cap, output cap, catch diode, and heatsink; single-point grounding recommended per layout guidelines. |
| 4 - Feedback | Regulated output sense node | Internally connected to midpoint of precision resistor divider; not user-accessible in fixed-output versions - no external resistor required. |
| 5 - ON/OFF | Logic-enable control input | TTL-compatible: ≤1.2 V = ON, ≥2.2 V = OFF; draws ≤30 µA when active; enables system-level power sequencing and standby. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors - reduces BOM count, layout complexity, and calibration drift over temperature. |
| 52 kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with low-cost, high-current inductors optimized for this frequency (e.g., Renco RL1952). |
| Integrated protection | Thermal shutdown + cycle-by-cycle current limit prevent damage during overload, short-circuit, or inadequate heatsinking - no external fault circuitry needed. |
| TTL shutdown capability | 80 µA standby current allows microcontroller GPIO to disable regulator during idle - critical for battery-powered or energy-certified systems. |
| Wide input range (4.75–40 V) | Supports direct connection to 12 V/24 V industrial rails and automotive batteries (with external TVS) - reduces need for pre-regulation stages. |
Applications
| Industrial PLC I/O Power Rail | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powers digital I/O buffers, optocouplers, and level translators in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary 5 V buck regulator converting 24 V field bus to isolated logic rail. Use Value: 77% efficiency at 1.0 A reduces board-level heat rise; ±4% output tolerance ensures reliable CMOS logic operation across temperature. |
Use Scenario: Supplies 5 V to microcontroller peripherals (CAN transceivers, LIN drivers, sensor interfaces) in vehicle body electronics. IC Role / Device Role / Timing Role: Main DC-DC converter downstream of automotive-grade input filter and TVS protection. Use Value: 40 V max input withstands load-dump transients (ISO 7637-2 Pulse 5a); ON/OFF pin enables MCU-controlled power gating during sleep. |
| Point-of-Load Converter for FPGA Core Logic | Medical Infusion Pump Controller Supply |
|
Use Scenario: Generates clean 5 V for FPGA configuration memory, JTAG interface, and auxiliary logic in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from main 12 V system rail. Use Value: Fixed 5.0 V output eliminates resistor tolerance errors; TO-220 package allows simple heatsink attachment for intermittent 1.0 A bursts. |
Use Scenario: Provides safety-isolated 5 V rail for motor driver logic, display controller, and keypad interface in Class II medical devices. IC Role / Device Role / Timing Role: Isolated DC-DC stage (with external transformer-based front-end) feeding low-noise LDO post-regulator. Use Value: MSL Level 1 moisture sensitivity enables standard reflow assembly; thermal shutdown meets IEC 60601-1 fault-safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVT-5.0 | Extended input range: 4.0–60 V; otherwise identical pinout, specs, and thermal performance. | Required for 48 V telecom or heavy-duty vehicle systems where input may exceed 40 V. | Select when VIN can reach 48–60 V; same PCB layout, but verify external components (diode, capacitor voltage ratings) support higher stress. |
| MP1584EN-LF-Z | Higher frequency (1.5 MHz), smaller solution size, adjustable output only; no fixed 5 V variant; different pinout and control scheme. | Better suited for space-constrained designs needing <1 cm² footprint; requires external feedback resistors and careful layout for EMI. | Choose for compact consumer or portable designs; not drop-in - redesign of feedback network, inductor, and compensation required. |
Compared with LM2575HVT-5.0, the LM2575T-005 offers lower cost and proven reliability in 40 V-class systems, while MP1584EN-LF-Z trades simplicity and ruggedness for miniaturization - making LM2575T-005 optimal for industrial and automotive applications prioritizing robustness over board area.
Availability
LM2575T-005 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, and medical infusion pump controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575T-005 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a rugged, easy-to-use buck regulator family minimizing external components for cost-sensitive industrial and automotive power supplies - emphasizing thermal resilience, wide input range, and integrated protection.
FAQ
What is the maximum input voltage rating for LM2575T-005?
The absolute maximum input voltage for LM2575T-005 is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Sustained operation above 40 V risks exceeding safe junction temperature or violating guaranteed specifications; for 48 V systems, LM2575HVT-5.0 (60 V max) is the validated alternative. LM2575T-005 must always be used with appropriate input transient suppression.
Does LM2575T-005 require external feedback resistors to set its output voltage?
No. LM2575T-005 is the fixed 5.0 V output version - its internal resistor divider is factory-trimmed and permanently connected to the feedback amplifier, so Pin 4 (Feedback) is not accessible for external programming. This eliminates resistor tolerance, drift, and layout sensitivity. LM2575T-005 delivers 5.0 V ±4% without any external resistors.
Can LM2575T-005 operate without a heatsink at 1.0 A output current?
Yes - under typical conditions (e.g., 12 VIN, 5 VOUT, 25°C ambient, adequate PCB copper pour), LM2575T-005 dissipates ~0.5 W and remains within thermal limits without a heatsink. However, at high input voltages (e.g., 40 VIN) or elevated ambient temperatures (>60°C), thermal derating applies; the TO-220 package's RJA = 65°C/W requires heatsinking to maintain TJ < 125°C at full load.
What type of catch diode is recommended for LM2575T-005?
A Schottky diode rated for ≥1.2× output current (≥1.2 A) and ≥1.25× maximum input voltage (≥50 V for 40 VIN) is recommended. The 1N5819 (1 A, 40 V) is commonly used for ≤24 V inputs; for 36–40 V operation, the MBR2045CT (20 A, 45 V dual) or SB560 (5 A, 60 V) provides sufficient margin. Reverse recovery time and forward voltage directly impact efficiency and thermal performance of LM2575T-005.
Is LM2575T-005 RoHS-compliant and halogen-free?
Yes. Per the datasheet revision 14 (March 2025), LM2575T-005 is explicitly marked as a Pb-free device and complies with RoHS Directive 2011/65/EU. It also meets JEDEC JS709B requirements for halogen-free materials (≤900 ppm bromine, ≤900 ppm chlorine), confirmed in the "Package Dimensions" and "Moisture Sensitivity" sections of the official onsemi documentation for LM2575T-005.
LM2575T-005 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
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- Output Type:
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- Number of Outputs:
- -
- Voltage - Input (Min):
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- Voltage - Input (Max):
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- Voltage - Output (Min/Fixed):
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- Voltage - Output (Max):
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- Current - Output:
- -
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- Synchronous Rectifier:
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- Supplier Device Package:
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LM2575T-005 FAQ
1.How can I place an order for LM2575T-005 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-005 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 LM2575T-005 reliable?
The price and inventory of LM2575T-005 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-005 is usually 5 days.
3.What payment methods are accepted for LM2575T-005?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-005 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-005?
LM2575T-005 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-005 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 LM2575T-005?
For technical support, including LM2575T-005 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-005 requirements.
6.How does Aetrix verify that LM2575T-005 is sourced from the original manufacturer or authorized distributors?
All LM2575T-005 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 LM2575T-005 meets industry standards.
7.What is the process for return or replacement of LM2575T-005?
All LM2575T-005 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-005, 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 LM2575T-005 part is unused and in its original packaging.
Return procedure for LM2575T-005:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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