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onsemi LM2576D2T-ADJG
- Part No.:
- LM2576D2T-ADJG
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2T-ADJG.pdf
- Description:
- IC REG BUCK ADJ 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:516
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Product details
Overview
LM2576D2T-ADJG from onsemi is a monolithic 3.0 A, 52 kHz step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 7.0 V to 40 V input and delivers high efficiency-up to 77% at 12 VIN/5 VOUT/3 A-enabling compact, heatsink-free power supplies in industrial control and embedded systems.
For engineers reviewing the LM2576D2T-ADJG datasheet, pinout, applications, or equivalent options, key selection considerations include its D2PAK (TO-263) package with exposed thermal pad, feedback reference voltage of 1.23 V (±2% over 0 °C to 125 °C), 80 µA typical standby current under TTL shutdown, and compatibility with standard off-the-shelf 100 µH inductors.
Technical Context
The LM2576D2T-ADJG implements a fixed-frequency (52 kHz) voltage-mode buck controller with an internal 1.23 V bandgap reference, error amplifier, PWM comparator, and 3.0 A NPN switch. Its oscillator frequency shifts to ~18 kHz during overload or short-circuit events to reduce average power dissipation.
Feedback is sensed directly at Pin 4 (no internal divider), enabling precise external resistor programming of output voltage. The ON/OFF pin (Pin 5) accepts TTL-compatible logic signals (VIL ≤ 1.0 V, VIH ≥ 2.2 V at TJ = 25 °C) for low-quiescent-current shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 3.0 A continuous load current-supports high-power microcontroller or FPGA core rails without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V DC-enables direct operation from 12 V/24 V industrial buses or unregulated AC-DC outputs. |
| Feedback Reference | 1.23 V ±2% (0 °C to 125 °C)-sets output accuracy baseline; used with external R1/R2 to program 1.23–37 V output range. |
| Oscillator Frequency | 52 kHz ±10% (typical), 42–63 kHz over −40 °C to +125 °C-fixed frequency simplifies EMI filtering and inductor selection. |
| Standby Quiescent Current | 80 µA typical at 25 °C when ON/OFF pin = 5 V-enables ultra-low-power sleep modes in battery-backed systems. |
| Saturation Voltage | 1.5 V typical at IOUT = 3.0 A-defines minimum dropout (VIN − VOUT) and conduction loss in high-current operation. |
| Current Limit Threshold | 4.2–6.9 A peak (25 °C), 3.5–7.5 A (−40 °C to +125 °C)-provides robust short-circuit protection without external sensing. |
Pinout & Package
D2PAK (TO-263-5) package with exposed thermal pad connected to Pin 3 (GND); requires PCB copper pour for thermal management per datasheet Case 936A outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR aluminum electrolytic bypass capacitor. |
| 2 - Output | Emitter of internal NPN switch | Switching node driving inductor; PCB trace area must be minimized to reduce EMI coupling to sensitive circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, feedback network, and thermal pad; single-point grounding recommended. |
| 4 - Feedback | Error amplifier non-inverting input | Direct connection to external R1/R2 divider; senses output voltage to regulate VOUT = 1.23 × (1 + R2/R1). |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator and reduces IQ to 80 µA; open or logic-low (<1.0 V) enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage range | 1.23 V to 37 V via two external resistors-eliminates need for multiple fixed-voltage SKUs in multi-rail designs. |
| Integrated protection | Cycle-by-cycle current limiting + thermal shutdown-prevents damage during sustained overload or ambient temperature excursions. |
| Low-component-count design | Requires only 4 external components (inductor, catch diode, input/output capacitors)-reduces BOM cost and layout complexity. |
| Standard inductor compatibility | Optimized for widely available 100 µH pulse inductors (e.g., Pulse PE-92108)-accelerates prototyping and avoids custom magnetics. |
| Moisture Sensitivity Level | MSL 1 (unlimited floor life at ≤30 °C/60% RH)-simplifies handling and eliminates bake requirements before reflow. |
Applications
| Industrial Motor Drive Power Supply | Programmable Logic Controller (PLC) I/O Module |
|---|---|
|
Use Scenario: Provides regulated 5 V or 12 V rail for digital I/O isolation, analog sensor conditioning, and communication interface circuitry in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V DC field bus to stable low-voltage logic rails; operates continuously across −40 °C to +70 °C ambient. Use Value: 3.0 A output supports simultaneous powering of multiple isolated channels; thermal shutdown prevents failure during extended overcurrent events in harsh environments. |
Use Scenario: Generates 3.3 V core voltage for ARM Cortex-M7 microcontrollers and 12 V bias for relay drivers within modular PLC backplanes. IC Role / Device Role / Timing Role: High-efficiency buck converter replacing linear regulators to minimize heat buildup in densely packed chassis. Use Value: 77% efficiency at full load reduces thermal load by >5 W vs. linear solution-enables fanless operation and extends component lifetime. |
| Medical Diagnostic Equipment Power Stage | Automotive Aftermarket Telematics Unit |
|
Use Scenario: Supplies clean, regulated 15 V for CCD image sensor bias and 5 V for ADC/DSP subsystems in portable ultrasound devices. IC Role / Device Role / Timing Role: Main DC-DC stage after front-end AC-DC or battery input; must meet IEC 60601-1 creepage/clearance and ripple requirements. Use Value: Fixed 52 kHz switching frequency allows predictable EMI filter design; ±4% output tolerance ensures consistent sensor bias accuracy across temperature. |
Use Scenario: Converts vehicle battery voltage (9–16 V) to stable 5 V and 12 V rails for GPS module, cellular modem, and CAN transceiver in OBD-II telematics units. IC Role / Device Role / Timing Role: Input-stage buck regulator handling wide-input automotive transients (load dump, cold crank) with built-in overvoltage/overcurrent protection. Use Value: 40 V absolute maximum input rating withstands ISO 7637-2 Pulse 5a (load dump up to 35 V); ON/OFF pin enables ignition-synchronized power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | Higher 63 kHz switching frequency; lower 1.23 V reference tolerance (±1.5%); 3.0 A rated but derated above 85 °C junction. | Better suited for space-constrained designs requiring smaller inductors; less thermally robust in sealed enclosures above 70 °C ambient. | Select LM2596S-ADJ if board area is critical and thermal margin exceeds 20 °C; otherwise LM2576D2T-ADJG offers superior thermal reliability. |
| MP1584EN-LF-Z | 4.5–28 V input range; 3 A output; 1.22 V reference; requires external compensation; no integrated thermal shutdown latch. | Designed for consumer-grade applications; lacks automotive-grade transient immunity and failsafe protection features. | Choose MP1584EN-LF-Z only for cost-sensitive, non-safety-critical applications with narrow input range; LM2576D2T-ADJG provides broader input, rugged protection, and industrial qualification. |
Compared with LM2596S-ADJ and MP1584EN-LF-Z, LM2576D2T-ADJG delivers wider input voltage range (7–40 V), guaranteed 3.0 A performance across −40 °C to +125 °C, and integrated thermal shutdown latching-making it preferred for industrial, medical, and automotive-adjacent power systems where reliability trumps minimal footprint.
Availability
LM2576D2T-ADJG is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers, medical diagnostic equipment, and automotive telematics units requiring stable component supply and long-term manufacturability.
Supply support for LM2576D2T-ADJG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2576 series was designed as a rugged, low-component-count buck regulator family targeting cost-sensitive yet reliability-critical industrial and embedded power conversion-emphasizing thermal resilience, wide input range, and ease of compliance with safety standards.
FAQ
What is the maximum input voltage rating for LM2576D2T-ADJG?
The LM2576D2T-ADJG has an absolute maximum input voltage rating of 45 V, with recommended operating range of 7.0 V to 40 V. Exceeding 45 V may cause permanent damage. For automotive applications subject to load dump transients, the 40 V operating limit ensures safe operation under ISO 7637-2 Pulse 5a conditions when combined with appropriate front-end clamping.
How do I calculate the output voltage for LM2576D2T-ADJG?
The output voltage of LM2576D2T-ADJG is set by two external resistors: VOUT = 1.23 V × (1 + R2/R1). R1 is typically 1.0 kΩ to 5.0 kΩ; R2 is selected accordingly. For example, to achieve 12 V output, use R1 = 1.2 kΩ and R2 = 10.5 kΩ. The feedback pin draws only 25–200 nA, minimizing resistor-divider power loss and voltage error.
Does LM2576D2T-ADJG require a heatsink in typical operation?
LM2576D2T-ADJG can operate without an external heatsink at full 3.0 A load when ambient temperature is ≤50 °C and PCB thermal design includes ≥4 cm² of 2-oz copper connected to the exposed thermal pad (Pin 3). At higher ambient or continuous high-duty-cycle operation, a small heatsink improves thermal margin-junction-to-ambient thermal resistance is 70 °C/W in D2PAK package.
What type of catch diode is recommended for LM2576D2T-ADJG?
A Schottky diode with ≥3.0 A average current rating and ≥40 V reverse voltage is recommended for LM2576D2T-ADJG. The datasheet specifies MBR360 (40 V, 3.0 A) as optimal. Using fast-recovery diodes like MUR420 increases switching losses and reduces efficiency by ~3–5%; Schottky selection minimizes forward voltage drop and recovery losses.
Is LM2576D2T-ADJG RoHS and REACH compliant?
Yes, LM2576D2T-ADJG is Pb-free and RoHS-compliant per EU Directive 2011/65/EU, and meets REACH SVHC requirements. The "G" suffix in the part number explicitly denotes green (halogen-free, lead-free) packaging per onsemi's product marking convention and datasheet footnote on page 1.
LM2576D2T-ADJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 3A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2576D2T-ADJG FAQ
1.How can I place an order for LM2576D2T-ADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2T-ADJG 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 LM2576D2T-ADJG reliable?
The price and inventory of LM2576D2T-ADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-ADJG is usually 5 days.
3.What payment methods are accepted for LM2576D2T-ADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-ADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2T-ADJG?
LM2576D2T-ADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2T-ADJG 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 LM2576D2T-ADJG?
For technical support, including LM2576D2T-ADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-ADJG requirements.
6.How does Aetrix verify that LM2576D2T-ADJG is sourced from the original manufacturer or authorized distributors?
All LM2576D2T-ADJG 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 LM2576D2T-ADJG meets industry standards.
7.What is the process for return or replacement of LM2576D2T-ADJG?
All LM2576D2T-ADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-ADJG, 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 LM2576D2T-ADJG part is unused and in its original packaging.
Return procedure for LM2576D2T-ADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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