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onsemi LM2575D2T-015G
- Part No.:
- LM2575D2T-015G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-015G.pdf
- Description:
- IC REG BUCK 15V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,126
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Product details
Overview
LM2575D2T-015G 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 on-card DC-DC conversion.
For engineers reviewing the LM2575D2T-015G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A load capability, fixed 15 V output without external feedback resistors, TO-263 (D2PAK) package with heatsink-connected tab, and compatibility with standard off-the-shelf 330 µH inductors and Schottky catch diodes.
Technical Context
The LM2575D2T-015G implements a voltage-mode controlled buck converter with a built-in 1.0 A NPN switch, 1.23 V internal bandgap reference, and error amplifier driving a PWM comparator. Its 52 kHz fixed-frequency oscillator enables predictable EMI filtering and simplifies inductor selection using standardized values.
It features TTL-compatible ON/OFF control (1.4 V threshold), 80 µA standby quiescent 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, 0.2–1.0 A load, and 18–40 V input - eliminates need for feedback resistor network. |
| Output Current | Guaranteed 1.0 A continuous - supports medium-power loads without external current boosting. |
| Input Voltage Range | 18 V to 40 V DC - suitable for 24 V industrial rails and automotive battery-derived inputs. |
| Switching Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current inductors with minimal core loss. |
| Efficiency | 88% typical at Vin = 18 V, IOUT = 1.0 A - significantly higher than linear regulators, reducing thermal management burden. |
| Quiescent Current | 5.0–9.0 mA active mode; 15–200 µA in TTL shutdown - enables low-power standby operation in battery-backed systems. |
| Saturation Voltage | 1.0–1.3 V at 1.0 A - defines minimum dropout and conduction loss under full load. |
Pinout & Package
LM2575D2T-015G uses the D2PAK (TO-263) package (Case 936A), with the heatsink surface electrically connected to Pin 3 (GND) for thermal and electrical grounding. The 5-pin configuration supports compact layout with integrated thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 18–40 V unregulated DC; requires local 100 µF/50 V low-ESR input capacitor to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 15 V; PCB copper area must be minimized to reduce EMI coupling into sensitive circuitry. |
| 3 - GND | Circuit ground reference | Common return for input/output paths and thermal interface; heatsink tab connects here - single-point grounding recommended. |
| 4 - Feedback | Regulation sense node | Internally tied to 15 V divider; not user-accessible - no external resistors required for fixed-output operation. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-low (<1.2 V) enables regulation; logic-high (>2.2 V) disables output and reduces IQ to ~80 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external feedback resistors and associated temperature drift, simplifying BOM and improving long-term stability. |
| Integrated thermal shutdown | Automatically disables switching if junction temperature exceeds 150°C, preventing damage during overload or poor heatsinking. |
| Cycle-by-cycle current limiting | Clamps peak switch current to 1.4–3.2 A depending on temperature, enabling robust short-circuit protection without external sensing. |
| 52 kHz fixed-frequency operation | Enables consistent EMI filter design and compatibility with widely available, cost-optimized 330 µH power inductors. |
| TTL shutdown capability | Reduces total input current to ~80 µA in standby, supporting low-power system-level sleep modes. |
Applications
| Industrial Power Supply | Battery Charger Front-End |
|---|---|
|
Use Scenario: On-board 15 V rail generation from 24 V factory automation bus. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable 15 V for PLC I/O modules and sensor interfaces. Use Value: Delivers 1.0 A with 88% efficiency at 18 V input, minimizing heat rise and eliminating need for heatsink in ambient ≤50°C. |
Use Scenario: Pre-regulator stage in multi-chemistry Li-ion/NiMH battery charger. IC Role / Device Role / Timing Role: Efficient intermediate voltage source feeding linear post-regulators or charge controller ICs. Use Value: Fixed 15 V output avoids feedback calibration drift across temperature, ensuring consistent charge voltage reference accuracy. |
| On-Card DC-DC Converter | Positive-to-Negative Inverter |
|
Use Scenario: Local 15 V supply on embedded computing card with space-constrained layout. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator requiring only 4 passive components and standard inductor. Use Value: D2PAK package provides direct heatsink mounting; 52 kHz frequency allows small, low-profile magnetics (e.g., 330 µH, 1.5 A). |
Use Scenario: Generating −15 V rail from +24 V input for op-amp biasing or analog signal conditioning. IC Role / Device Role / Timing Role: Core switching element in inverting buck-boost topology (with external inductor/diode/capacitor reconfiguration). Use Value: Internal 1.0 A switch and current limiting support reliable inverter operation up to 500 mA output with minimal external parts. |
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 (Case 314D) package; identical electrical specs; RJA = 65°C/W vs. 70°C/W for D2PAK. | Requires through-hole PCB assembly and separate heatsink mounting; less suitable for high-density SMT layouts. | Choose when mechanical mounting constraints favor TO-220 or legacy board compatibility is required. |
| MP1584EN-LF-Z | 4.5–28 V input; adjustable output; 3 MHz switching; 3 A rating; different pinout and control architecture. | Not pin-compatible; requires redesign of feedback network, compensation, and magnetics; suited for higher-frequency, lower-voltage apps. | Consider only for new designs needing wider input range, higher current, or smaller solution size - not a drop-in replacement. |
Compared with LM2575T-15G, the LM2575D2T-015G offers superior thermal performance in surface-mount configurations due to its D2PAK heatsink tab, while MP1584EN-LF-Z enables higher efficiency at lighter loads and smaller footprints but demands full schematic and layout revision.
Availability
LM2575D2T-015G is available at Aetrix Electronics and suitable for industrial power supplies, battery charger front-ends, and on-card DC-DC converters requiring stable component supply, long-lifecycle support, and Pb-free compliance.
Supply support for LM2575D2T-015G 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 specializing in energy-efficient power management, analog, and sensor solutions 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) industrial and embedded applications where simplicity, reliability, and thermal robustness are prioritized over ultra-high frequency or ultra-low quiescent current.
FAQ
What is the maximum input voltage for the LM2575D2T-015G?
The LM2575D2T-015G supports a maximum input voltage of 40 V DC, with absolute maximum rating at 45 V. Operation above 40 V violates the guaranteed specifications and may cause premature failure. For 15 V output, the recommended minimum input is 18 V to maintain regulation and avoid dropout conditions.
Does the LM2575D2T-015G require external feedback resistors?
No, the LM2575D2T-015G is a fixed-output version with internal resistor divider set for 15 V. Pin 4 (Feedback) is not accessible externally - no resistors are needed, reducing part count and eliminating resistor tolerance and temperature drift effects on output accuracy.
Can the LM2575D2T-015G be used in a negative-output (buck-boost) configuration?
Yes, the LM2575D2T-015G can be configured as a positive-to-negative inverter per Figure 1 in the datasheet. This requires repositioning the inductor and diode to implement a buck-boost topology, delivering −15 V output. Component stress and efficiency differ from buck mode, and output current capability is reduced.
What is the thermal resistance (RJA) of the LM2575D2T-015G in typical PCB layout?
The LM2575D2T-015G has a specified RJA of 70°C/W under standard JEDEC test conditions (2s2p copper, 1-inch² pad). Actual thermal performance depends heavily on PCB copper area connected to Pin 3 (GND/heatsink tab); doubling the copper area can reduce RJA by ~15–20°C/W.
Is the LM2575D2T-015G RoHS and REACH compliant?
Yes, the LM2575D2T-015G is a Pb-free device meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006 requirements. It carries Moisture Sensitivity Level (MSL) 1, indicating unlimited floor life at ≤30°C/60% RH and no bake requirement prior to reflow.
LM2575D2T-015G 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-015G FAQ
1.How can I place an order for LM2575D2T-015G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-015G 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-015G reliable?
The price and inventory of LM2575D2T-015G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-015G is usually 5 days.
3.What payment methods are accepted for LM2575D2T-015G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-015G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-015G?
LM2575D2T-015G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-015G 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-015G?
For technical support, including LM2575D2T-015G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-015G requirements.
6.How does Aetrix verify that LM2575D2T-015G is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-015G 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-015G meets industry standards.
7.What is the process for return or replacement of LM2575D2T-015G?
All LM2575D2T-015G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-015G, 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-015G part is unused and in its original packaging.
Return procedure for LM2575D2T-015G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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