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onsemi LM2575D2T-015
- Part No.:
- LM2575D2T-015
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-015.pdf
- Description:
- IC REG BUCK 15V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,763
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Product details
Overview
LM2575D2T-015 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 15 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 operates from 18 V to 40 V input and is used in battery charger power supplies and on-card DC-DC conversion.
For engineers reviewing the LM2575D2T-015 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A load capability, fixed 15 V output without external feedback resistors, D2PAK (TO-263) package thermal performance, and compatibility with standard Schottky catch diodes and off-the-shelf inductors.
Technical Context
The LM2575D2T-015 implements a voltage-mode controlled buck converter with a built-in 1.0 A NPN switch, 1.23 V bandgap reference, error amplifier, and 52 kHz oscillator. Its control loop regulates output by adjusting duty cycle based on feedback from the internal 15 V divider network.
It features TTL-compatible ON/OFF pin logic (1.4 V threshold), 80 µA standby current when disabled, and protection mechanisms including thermal shutdown and peak-current limiting (1.4–3.2 A range). The device requires only four external components: input capacitor, output capacitor, inductor, and catch diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over −40°C to +125°C, 18 V ≤ Vin ≤ 40 V, 0.2 A ≤ IOUT ≤ 1.0 A - eliminates need for external feedback resistors. |
| Output Current | Guaranteed 1.0 A continuous - supports medium-power loads without external current boosting. |
| Input Voltage Range | 4.75 V to 40 V - accommodates wide industrial and automotive supply rails, with 18–40 V specified for 15 V output operation. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | 88% typical at VIN = 18 V, IOUT = 1.0 A - significantly exceeds linear regulators under same conditions, minimizing heatsink requirements. |
| Thermal Resistance | Junction-to-case RJC = 5.0°C/W - enables direct heatsink mounting via exposed tab (Pin 3), critical for sustained 1.0 A operation in compact enclosures. |
| Standby Current | 80 µA typical at TJ = 25°C when ON/OFF pin ≥ 2.4 V - supports low-power system sleep modes without auxiliary LDOs. |
Pinout & Package
LM2575D2T-015 uses the D2PAK (TO-263-5) package (Case 936A), with Pin 3 (GND) electrically and thermally connected to the exposed metal tab for heatsinking. The package is moisture sensitivity level (MSL) 1 and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts unregulated DC (18–40 V); requires low-ESR input capacitor placed adjacent to minimize switching transients. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤1.3 V ensures low conduction loss; PCB copper area must be minimized to reduce EMI coupling. |
| 3 - GND | Circuit ground & thermal pad | Reference for all internal circuitry; exposed tab must be soldered to large copper pour or heatsink for thermal management. |
| 4 - Feedback | Regulated output sense node | Internally connected to 15 V divider; not accessible externally - no external resistor network required for fixed-output operation. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible input; <1.0 V = "on", >2.4 V = "off"; pulls total supply current to ~80 µA in shutdown state. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external feedback resistors and associated layout sensitivity, reducing BOM count and improving long-term stability. |
| Integrated protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload, short-circuit, or ambient temperature excursions. |
| Low external component count | Only four passive components required (input cap, output cap, inductor, Schottky diode) - simplifies design validation and reduces board space. |
| High efficiency at 15 V output | 88% typical efficiency at 18 V input / 1.0 A load - reduces power dissipation to ~2 W, enabling operation without forced air or large heatsinks. |
| D2PAK thermal performance | RJC = 5.0°C/W and exposed tab allow direct heatsink attachment - supports full 1.0 A output in ambient temperatures up to +70°C with minimal copper area. |
Applications
| Battery Charger Power Supply | Industrial On-Card DC-DC Conversion |
|---|---|
|
Use Scenario: Regulating 24 V rail to stable 15 V for charging lead-acid or LiFePO₄ battery management systems. IC Role / Device Role / Timing Role: Primary step-down regulator providing constant-voltage source; 52 kHz switching frequency avoids audible noise and simplifies EMI filtering. Use Value: Delivers full 1.0 A at 88% efficiency, reducing thermal load on PCB and eliminating need for secondary linear post-regulation. |
Use Scenario: Generating local 15 V bias for analog front-ends, op-amps, or sensor signal conditioning on dense industrial control cards. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing discrete transistor-based designs; fixed output removes trimming overhead. Use Value: D2PAK package enables direct heatsink mounting on card edge, supporting 1.0 A load in confined spaces without airflow. |
| Automotive Pre-Regulator | POS Terminal Power Module |
|
Use Scenario: Conditioning vehicle battery voltage (9–16 V nominal, up to 40 V load dump) to clean 15 V for infotainment subsystems. IC Role / Device Role / Timing Role: High-input-voltage tolerant buck regulator with thermal shutdown - survives cold-crank and load-dump transients. Use Value: ±4% output tolerance over −40°C to +125°C ensures reliable operation across automotive temperature extremes without calibration. |
Use Scenario: Providing regulated 15 V to thermal print head drivers and EMV contact chip readers in point-of-sale terminals. IC Role / Device Role / Timing Role: Fixed-output switching regulator enabling fast enable/disable via ON/OFF pin for power sequencing and energy savings. Use Value: 80 µA standby current allows deep-sleep mode between transactions, extending battery backup runtime in offline operation. |
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-15 | TO-220-5 package (Case 314D); RJA = 65°C/W vs. 70°C/W for D2PAK; identical electrical specs and pinout. | Requires larger heatsink or lower ambient for 1.0 A continuous operation; less suitable for surface-mount automated assembly. | Select LM2575T-15 only if through-hole mounting or legacy TO-220 footprint compatibility is required. |
| LM2596S-15 | Higher 3.0 A output rating, 150 kHz switching frequency, different pinout (no ON/OFF pin), and wider input range (4.5–40 V). | Enables smaller magnetics but increases EMI filtering complexity; lacks logic-enable function for power sequencing. | Choose LM2596S-15 only when higher current headroom or smaller inductor size is prioritized over enable control and thermal robustness. |
Compared with LM2575T-15, the LM2575D2T-015 offers superior thermal resistance to heatsink (RJC = 5.0°C/W) and surface-mount compatibility; versus LM2596S-15, it provides integrated ON/OFF control and proven reliability in 15 V fixed-output industrial designs, albeit at lower switching frequency.
Availability
LM2575D2T-015 is available at Aetrix Electronics and suitable for battery charger power supplies, industrial on-card DC-DC conversion, and automotive pre-regulator applications requiring stable component supply, long-lifecycle support, and qualified sourcing.
Supply support for LM2575D2T-015 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 supplier focused on energy-efficient power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a cost-optimized, easy-to-use monolithic buck regulator family targeting medium-current (≤1.0 A), fixed-output industrial and automotive power supplies where simplicity, thermal robustness, and long-term availability are critical.
FAQ
What is the maximum input voltage for LM2575D2T-015?
The absolute maximum supply voltage for LM2575D2T-015 is 45 V, but the recommended operating maximum is 40 V. For reliable 15 V output regulation, the datasheet specifies operation within 18 V to 40 V input range. Exceeding 40 V risks exceeding internal transistor breakdown limits and invalidating the ±4% output tolerance guarantee.
Does LM2575D2T-015 require external feedback resistors?
No, LM2575D2T-015 does not require external feedback resistors. It is the fixed 15 V output variant, with the feedback divider internally trimmed and connected to Pin 4. Unlike the adjustable version (LM2575-ADJ), no external R1/R2 network is needed - Pin 4 is reserved but not user-accessible for programming.
What is the thermal performance difference between LM2575D2T-015 and LM2575T-15?
LM2575D2T-015 (D2PAK) has junction-to-case thermal resistance RJC = 5.0°C/W, while LM2575T-15 (TO-220) has RJC = 5.0°C/W but higher junction-to-ambient RJA = 65°C/W vs. 70°C/W for D2PAK. The D2PAK's exposed tab enables more efficient heatsink attachment, making LM2575D2T-015 better suited for sustained 1.0 A operation in compact layouts.
Can LM2575D2T-015 be used with a 12 V input?
LM2575D2T-015 is not characterized for stable 15 V output with 12 V input - the minimum recommended input is 18 V per the datasheet's operating ratings. At 12 V, the device cannot achieve regulation due to dropout constraints (Vsat + diode drop ≈ 2.5 V minimum overhead), resulting in unregulated or zero output.
What catch diode is recommended for LM2575D2T-015?
The datasheet recommends Schottky diodes such as 1N5822 (3 A, 40 V) or MBR340 (3 A, 40 V) for LM2575D2T-015. These provide low forward voltage (~0.45 V), fast recovery, and sufficient current rating (≥1.2×1.0 A load) to handle peak inductor current and minimize conduction loss and thermal stress.
LM2575D2T-015 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 15V
- 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:
- D2PAK-5
LM2575D2T-015 FAQ
1.How can I place an order for LM2575D2T-015 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-015 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 LM2575D2T-015 reliable?
The price and inventory of LM2575D2T-015 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-015 is usually 5 days.
3.What payment methods are accepted for LM2575D2T-015?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-015 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-015?
LM2575D2T-015 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-015 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 LM2575D2T-015?
For technical support, including LM2575D2T-015 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-015 requirements.
6.How does Aetrix verify that LM2575D2T-015 is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-015 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 LM2575D2T-015 meets industry standards.
7.What is the process for return or replacement of LM2575D2T-015?
All LM2575D2T-015 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-015, 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 LM2575D2T-015 part is unused and in its original packaging.
Return procedure for LM2575D2T-015:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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