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onsemi LM2575D2T-15R4
- Part No.:
- LM2575D2T-15R4
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-15R4.pdf
- Description:
- IC REG BUCK 15V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,974
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Product details
Overview
LM2575D2T-15R4 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 industrial DC-DC conversion stages.
For engineers reviewing the LM2575D2T-15R4 datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package mapping, real-world design meaning of key specs, and two confirmed alternative parts for fixed 15 V buck regulation at 1 A.
Technical Context
The LM2575D2T-15R4 implements a voltage-mode controlled buck converter with an internal 1.0 A NPN switch, 1.235 V bandgap reference, and fixed-frequency 52 kHz oscillator. Its feedback loop uses an external resistor divider only in adjustable versions; the LM2575D2T-15R4 has internal resistors set for 15 V output.
It features TTL-compatible ON/OFF control (1.4 V threshold), 80 µA standby quiescent current, and protection including thermal shutdown and peak-current limiting (1.7–3.2 A range). The device is rated for −40°C to +125°C junction temperature and supports continuous conduction mode operation with standard off-the-shelf inductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full line (18–40 V), load (0.2–1.0 A), and temperature (−40°C to +125°C) - ensures stable rail for analog front-ends or motor drivers without external feedback components. |
| Max Output Current | 1.0 A continuous - sufficient to power single-board computers, sensor modules, or LED arrays without external current boosting. |
| Input Voltage Range | 4.75 V to 40 V - supports wide-input industrial 24 V systems and automotive battery-supplied applications with transient tolerance. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current toroidal inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% typical at Vin = 18 V, Iout = 1.0 A - minimizes thermal load; eliminates need for heatsink in many PCB layouts with moderate airflow. |
| Quiescent Current | 5.0–9.0 mA active, 15–200 µA in shutdown - enables low-power standby modes in battery-backed systems without compromising wake-up responsiveness. |
| Thermal Resistance | RθJC = 5.0°C/W - allows direct heatsink mounting via exposed tab (Pin 3) for reliable 1 A operation at ambient up to 85°C. |
Pinout & Package
D2PAK (TO-263) package (Case 936A) with exposed metal tab thermally and electrically connected to Pin 3 (GND); heatsink surface must be mounted to system ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires low-ESR 100 µF input capacitor placed within 5 mm to suppress switching transients. |
| 2: Output | Emitter of internal NPN switch | Delivers regulated 15 V; saturation voltage ≤1.2 V at 1.0 A - contributes directly to dropout and efficiency; PCB copper area must be minimized to reduce noise coupling. |
| 3: GND | Circuit ground / heatsink connection | Common return for all internal circuits and thermal path; must be connected to large ground plane or external heatsink for RθJC = 5.0°C/W performance. |
| 4: Feedback | Regulation sense node | Internally tied to 15 V divider; not accessible - no external resistor network required, simplifying layout and eliminating trimming errors. |
| 5: ON/OFF | Logic-enable control input | TTL-compatible: <1.4 V = ON, >2.2 V = OFF; draws ≤30 µA in shutdown - enables microcontroller-controlled power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external feedback resistors - reduces BOM count, layout area, and calibration drift in production. |
| Integrated current limit & thermal shutdown | Protects against short-circuit and overload without external sensing circuitry - enables robust field-deployed power supplies. |
| 52 kHz fixed-frequency operation | Enables use of low-cost, high-current, low-DCR inductors (e.g., 330 µH) and simplifies EMI filter design versus variable-frequency controllers. |
| TTL shutdown with 80 µA standby | Supports low-power sleep states in portable equipment - extends battery life while retaining fast wake-up capability. |
| D2PAK thermal package | Exposed tab bonded to Pin 3 (GND) provides direct thermal path to heatsink - achieves 1.0 A continuous output without forced air. |
Applications
| Industrial Power Supply | Battery Charger Front-End |
|---|---|
|
Use Scenario: Converts 24 V industrial bus to stable 15 V for PLC I/O modules and analog signal conditioning. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing isolated, ripple-controlled 15 V rail with built-in fault protection. Use Value: Delivers 1.0 A at 88% efficiency with no heatsink required, reducing enclosure size and thermal management cost. |
Use Scenario: Generates 15 V intermediate rail for charging circuitry in 12 V lead-acid or LiFePO₄ battery chargers. IC Role / Device Role / Timing Role: Pre-regulator stepping down rectified AC or solar input to fixed 15 V before linear post-regulation or charge controller IC. Use Value: High efficiency minimizes heat buildup during prolonged charging cycles; ON/OFF pin enables charge-state power gating. |
| On-Card DC-DC Conversion | Positive-to-Negative Converter (Buck-Boost) |
|
Use Scenario: Provides dedicated 15 V supply on dense embedded boards where space prohibits external DC-DC modules. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator using only four external components (diode, inductor, two capacitors). Use Value: Reduces component count by 30% vs. adjustable alternatives; D2PAK footprint fits tight board areas while enabling thermal relief. |
Use Scenario: Configured as inverting buck-boost to generate −15 V from a 24 V source for op-amp dual-rail supplies. IC Role / Device Role / Timing Role: Switching controller repurposed with external diode/capacitor topology to invert polarity while maintaining fixed output magnitude. Use Value: Leverages same 15 V internal reference and protection features - avoids separate negative regulator IC and saves board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVS-15 | Same pinout, same 15 V output, but rated for 60 V max input (vs. 40 V); higher RθJA (80°C/W) due to TO-220 package. | Suitable for 48 V telecom or PoE-powered systems where input transients exceed 40 V. | Select when input voltage may reach 50–60 V; accept larger thermal footprint and lower efficiency at 1 A. |
| MP1584EN-LF-Z | 3 A output, 1.5 MHz switching, SOIC-8 package; requires external feedback resistors even for 15 V - no fixed-voltage variant. | Better suited for space-constrained, high-density designs needing higher current or faster transient response. | Choose when upgrading current capability or frequency is acceptable; redesign feedback network and layout required. |
Compared with LM2575HVS-15, the LM2575D2T-15R4 offers lower thermal resistance and smaller D2PAK footprint at 40 V max input; compared with MP1584EN-LF-Z, it delivers drop-in simplicity for 15 V fixed output but trades off current headroom and switching speed.
Availability
LM2575D2T-15R4 is available at Aetrix Electronics and suitable for industrial power supplies, battery charger front-ends, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575D2T-15R4 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a simple, robust, and cost-effective monolithic buck regulator family for applications demanding minimal external components, high reliability, and wide-input operation - especially where thermal simplicity and proven field performance outweigh ultra-high frequency or digital control needs.
FAQ
What is the maximum input voltage rating for the LM2575D2T-15R4?
The LM2575D2T-15R4 has an absolute maximum input voltage of 45 V, but its guaranteed operating range is 18 V to 40 V for the 15 V output version. Operation above 40 V risks exceeding specified line regulation and thermal limits; sustained use beyond 45 V will cause permanent damage to the LM2575D2T-15R4.
Does the LM2575D2T-15R4 require external feedback resistors to set the output voltage?
No. The LM2575D2T-15R4 is a fixed-output variant with internal resistor dividers calibrated for 15 V. Pin 4 (Feedback) is internally connected and not user-accessible - no external resistors are needed, unlike the adjustable LM2575ADJ version. This simplifies layout and improves output accuracy stability over temperature.
Can the LM2575D2T-15R4 be used in a negative-output (inverting) configuration?
Yes. The LM2575D2T-15R4 can be configured as a positive-to-negative buck-boost converter per Figure 1 in the datasheet. In this topology, the fixed 15 V reference enables generation of −15 V output using external diodes and capacitors. However, regulation accuracy and load transient response differ from standard buck mode, and the LM2575D2T-15R4 itself remains a positive-output device.
What thermal management is required for full 1.0 A output from the LM2575D2T-15R4?
At 1.0 A and 18 V input, the LM2575D2T-15R4 dissipates ~3 W. With RθJC = 5.0°C/W and a properly mounted heatsink or 4-layer PCB with ≥4 in² copper pour on the GND plane, junction temperature stays below 125°C at 70°C ambient. No additional heatsink is required if PCB copper area exceeds 10 cm² connected to Pin 3.
Is the LM2575D2T-15R4 RoHS-compliant and halogen-free?
Yes. The LM2575D2T-15R4 is a Pb-free device meeting RoHS Directive 2011/65/EU and is halogen-free per J-STD-709. Moisture Sensitivity Level is MSL 1 - unlimited floor life at ≤30°C/85% RH - allowing standard SMT assembly without baking.
LM2575D2T-15R4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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):
- 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-15R4 FAQ
1.How can I place an order for LM2575D2T-15R4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-15R4 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-15R4 reliable?
The price and inventory of LM2575D2T-15R4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-15R4 is usually 5 days.
3.What payment methods are accepted for LM2575D2T-15R4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-15R4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-15R4?
LM2575D2T-15R4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-15R4 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-15R4?
For technical support, including LM2575D2T-15R4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-15R4 requirements.
6.How does Aetrix verify that LM2575D2T-15R4 is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-15R4 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-15R4 meets industry standards.
7.What is the process for return or replacement of LM2575D2T-15R4?
All LM2575D2T-15R4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-15R4, 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-15R4 part is unused and in its original packaging.
Return procedure for LM2575D2T-15R4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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