My Inquiry
My Account
onsemi LM2575D2T-15R4G
- Part No.:
- LM2575D2T-15R4G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-15R4G.pdf
- Description:
- IC REG BUCK 15V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:363
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575D2T-15R4G 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, and wide 4.75 V to 40 V input range. It integrates a 1.0 A switch, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - used in industrial power supplies, battery chargers, and on-card DC-DC conversion.
For engineers reviewing the LM2575D2T-15R4G datasheet, pinout, applications, or equivalent options, key selection considerations 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 330 µH inductors and Schottky catch diodes.
Technical Context
The LM2575D2T-15R4G implements a voltage-mode controlled buck converter with a fixed-frequency 52 kHz oscillator, internal 1.23 V bandgap reference, and error amplifier driving a 1.0 A NPN switch. Its architecture relies on external components - including an inductor, catch diode (e.g., 1N5819), input capacitor (≥100 µF), and output capacitor (≥330 µF) - to form a complete regulated power stage.
It features integrated protection: thermal shutdown triggers at ~150 °C junction temperature, cycle-by-cycle current limiting activates above 1.4–3.2 A peak switch current, and TTL-level ON/OFF pin (Pin 5) enables low-quiescent standby mode with ≤200 µA typical current. The device operates across −40 °C to +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over line/load/temperature - eliminates need for external feedback resistors and simplifies layout. |
| Max Output Current | 1.0 A continuous - supports medium-power loads such as microcontroller subsystems or sensor interfaces without external current boosting. |
| Input Voltage Range | 4.75 V to 40 V - accommodates 12 V/24 V industrial rails and unregulated battery inputs up to automotive 36 V transients. |
| Oscillator Frequency | 52 kHz (±10% over 0–125 °C) - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to MHz-range converters. |
| Efficiency | 88% at Vin = 18 V, IOUT = 1.0 A - significantly exceeds linear regulators under same conditions, minimizing heatsink requirements. |
| Standby Quiescent Current | ≤200 µA at TJ = −40 to +125 °C - enables low-power shutdown mode suitable for battery-backed systems. |
| Thermal Resistance | RJC = 5.0 °C/W - allows direct heatsink mounting via exposed tab (Pin 3), supporting >1 W dissipation with modest thermal interface. |
Pinout & Package
D2PAK (TO-263) package with exposed metal tab thermally and electrically connected to Pin 3 (GND). Heatsink surface must be isolated from other circuit potentials except ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires ≥100 µF low-ESR input capacitor placed adjacent to minimize switching noise. |
| 2 - Output | Emiter of internal NPN switch | Delivers switched output to inductor; PCB copper area must be minimized to reduce EMI coupling into sensitive analog circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, inductor, and catch diode; single-point grounding recommended for stability. |
| 4 - Feedback | Regulation sense node | Internally tied to 15 V divider - not connected externally; unused in fixed-output versions. |
| 5 - ON/OFF | Logic-controlled enable | TTL-compatible: <1.2 V = ON, >2.4 V = OFF; draws ≤30 µA when active, ≤200 µA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external resistor network, reducing BOM count and layout sensitivity while ensuring ±4% regulation across temperature and load. |
| Integrated 1.0 A switch | Reduces external component count and PCB footprint versus controller-only solutions; supports full-load operation without external MOSFET. |
| 52 kHz fixed-frequency operation | Enables use of cost-effective, high-current toroidal inductors (e.g., 330 µH) and simplifies EMI filtering versus variable-frequency designs. |
| Thermal shutdown + current limit | Provides autonomous fault recovery during overload or ambient overheating - no external protection circuitry required for basic applications. |
| D2PAK thermal performance | RJC = 5.0 °C/W enables direct heatsinking; tab connected to GND allows mechanical mounting without isolation hardware. |
Applications
| Industrial Power Supply | Battery Charger Front-End |
|---|---|
|
Use Scenario: Converting 24 V rail to stable 15 V for PLC I/O modules and fieldbus transceivers. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated 15 V bias for analog front-ends and digital logic. Use Value: Delivers 1.0 A with 88% efficiency at 18 V input, reducing thermal load vs. linear alternatives and enabling compact enclosure design. |
Use Scenario: Pre-regulating 36 V automotive battery input to 15 V before linear post-regulation for Li-ion charging circuitry. IC Role / Device Role / Timing Role: Efficient pre-converter handling bulk voltage reduction and transient suppression. Use Value: Wide 4.75–40 V input range tolerates cold-crank and load-dump events; ON/OFF pin enables charge-state synchronization. |
| On-Card DC-DC Conversion | Positive-to-Negative Converter |
|
Use Scenario: Generating local 15 V supply on a dense FPGA carrier board where space limits discrete solutions. IC Role / Device Role / Timing Role: Integrated buck regulator replacing multi-component discrete designs to save board area. Use Value: D2PAK package offers superior thermal performance vs. SO-8; only four external components required (inductor, diode, two caps). |
Use Scenario: Configured in inverting buck-boost topology to generate −15 V from +24 V for op-amp biasing. IC Role / Device Role / Timing Role: Core switching element repurposed with inverted feedback and output polarity. Use Value: Fixed 15 V reference enables precise negative output magnitude; 52 kHz frequency ensures predictable inductor sizing and ripple behavior. |
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-15G | TO-220 package (Case 314D); RJA = 65 °C/W vs. 70 °C/W for D2PAK; identical electrical specs. | Requires larger heatsink for same power dissipation; less suitable for high-density layouts. | Select when mechanical mounting constraints favor through-hole TO-220 or legacy board compatibility is required. |
| LM2596S-15 | Higher 3.0 A rating, 150 kHz switching, adjustable/fixed variants; different pinout and external component values. | Supports higher current and smaller magnetics but demands redesign of inductor, diode, and capacitor selection. | Choose for new designs needing >1.0 A or improved efficiency at light loads; not drop-in compatible. |
Compared with LM2575T-15G, the LM2575D2T-15R4G offers better thermal resistance to case and smaller footprint; versus LM2596S-15, it trades higher current capability for proven 52 kHz stability and simpler magnetics selection in established 15 V systems.
Availability
LM2575D2T-15R4G 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 automotive-grade reliability (MSL 1, Pb-free).
Supply support for LM2575D2T-15R4G 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 is a global semiconductor supplier focused on energy-efficient innovation, with leadership in power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a cost-optimized, easy-to-implement buck regulator family targeting medium-current (≤1.0 A) applications where simplicity, thermal robustness, and wide input range outweigh ultra-high efficiency or MHz switching.
FAQ
What is the maximum input voltage rating for LM2575D2T-15R4G?
The absolute maximum input voltage for LM2575D2T-15R4G is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V risks violating safe operating area limits, especially under high ambient temperature or heavy load. The LM2575D2T-15R4G maintains regulation and protection functionality within its specified 4.75–40 V range.
Does LM2575D2T-15R4G require external feedback resistors to set output voltage?
No - LM2575D2T-15R4G is a fixed-output variant with internal resistor divider configured for 15 V. Pin 4 (Feedback) is internally connected and must remain unconnected in standard operation. External resistors are only required for the adjustable version (LM2575ADJ); adding them to LM2575D2T-15R4G would disrupt regulation.
What is the thermal performance difference between LM2575D2T-15R4G and TO-220 versions?
LM2575D2T-15R4G uses a D2PAK package with RJC = 5.0 °C/W and RJA = 70 °C/W (typical), whereas TO-220 versions like LM2575T-15G have RJA = 65 °C/W but higher thermal resistance to ambient without heatsink. The D2PAK's exposed tab enables more efficient heatsinking in surface-mount layouts, making LM2575D2T-15R4G preferable for space-constrained, thermally demanding applications.
Can LM2575D2T-15R4G be used in a negative-output (inverting) configuration?
Yes - LM2575D2T-15R4G can be configured as a positive-to-negative buck-boost converter by repositioning the inductor and diode per standard inverting topology. The fixed 15 V reference defines output magnitude; however, feedback loop polarity must be inverted, and output capacitor polarity reversed. This use case is documented in the Applications section of the LM2575 datasheet.
What catch diode is recommended for LM2575D2T-15R4G at 1.0 A output?
A Schottky diode rated ≥30 V reverse voltage and ≥1.2 A average current is recommended - e.g., 1N5819 (1.0 A, 40 V) or MBR130 (1.3 A, 30 V). The LM2575D2T-15R4G's 52 kHz switching favors low-forward-voltage Schottkys to maximize efficiency; fast-recovery diodes may be used but incur ~0.2–0.3 V higher conduction loss than Schottkys.
LM2575D2T-15R4G 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:
- Last Time Buy
- 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-15R4G FAQ
1.How can I place an order for LM2575D2T-15R4G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-15R4G 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-15R4G reliable?
The price and inventory of LM2575D2T-15R4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-15R4G is usually 5 days.
3.What payment methods are accepted for LM2575D2T-15R4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-15R4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-15R4G?
LM2575D2T-15R4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-15R4G 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-15R4G?
For technical support, including LM2575D2T-15R4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-15R4G requirements.
6.How does Aetrix verify that LM2575D2T-15R4G is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-15R4G 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-15R4G meets industry standards.
7.What is the process for return or replacement of LM2575D2T-15R4G?
All LM2575D2T-15R4G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-15R4G, 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-15R4G part is unused and in its original packaging.
Return procedure for LM2575D2T-15R4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575D2T-15R4G 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
