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Texas Instruments LM2576SX-5.0/J7001717
- Part No.:
- LM2576SX-5.0/J7001717
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576SX-5.0/J7001717.pdf
- Description:
- IC REG BUCK BOOST 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,634
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Product details
Overview
LM2576SX-5.0/J7001717 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-263 (DDPAK) package, delivering fixed 5.0 V output with ±4% tolerance across line and load, 40 V max input voltage, and 52 kHz fixed-frequency operation. It serves as a high-efficiency replacement for linear regulators in industrial power supplies, motor drives, and test equipment.
For engineers reviewing the LM2576SX-5.0/J7001717 datasheet, LM2576SX-5.0/J7001717 pinout, LM2576SX-5.0/J7001717 application, or LM2576SX-5.0/J7001717 equivalent, key selection criteria include its 3-A continuous output capability, integrated cycle-by-cycle current limiting, thermal shutdown protection, TTL-compatible ON/OFF control, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576SX-5.0/J7001717 implements a fixed-frequency buck topology with internal 52 kHz oscillator, built-in 3-A NPN switch, and voltage-mode error amplifier referenced to a 1.23 V bandgap. Its feedback pin is internally connected to the output for fixed-voltage versions, eliminating external resistor dividers.
It operates in active mode when ON/OFF pin voltage drops below 1.2 V, enters shutdown at >1.4 V with 50 μA standby current, and features cycle-by-cycle current limiting (ICL = 4.2–6.9 A), thermal shutdown, and automatic frequency foldback (~11 kHz) during overload or short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full operating temperature (−40°C to +125°C) and load (0.5–3 A) |
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial rails; minimum start-up voltage ~8 V |
| Continuous Output Current | 3 A - sustained DC load capability without derating under proper thermal management |
| Switching Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity |
| Efficiency | 77% at VIN = 12 V, IOUT = 3 A - significantly reduces heat sink requirements vs. linear regulators |
| Standby Current | 50 μA typical - enables low-power system-level shutdown with minimal battery drain |
| Thermal Resistance (θJA) | 42.6°C/W (KTT package, JEDEC 4-layer board) - requires ≥1.6 in² copper pour for full 3-A operation at +125°C ambient |
Pinout & Package
LM2576SX-5.0/J7001717 uses the KTT (DDPAK/TO-263-5) surface-mount package with 10.16 mm × 8.42 mm body size and thermally enhanced exposed tab connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side transistor collector; must be decoupled with low-ESR capacitor placed <2 mm from pin |
| 2 - OUTPUT | Switching node | Emitter of internal NPN switch; connects directly to inductor and catch diode cathode - critical high-dI/dt path |
| 3 - GROUND | Power and signal reference | Low-impedance return for VIN bypass, feedback, and ON/OFF; shortest possible trace to CIN ground |
| 4 - FEEDBACK | Regulation sense | Internally tied to output for fixed 5-V version; no external divider required - simplifies layout and improves stability |
| 5 - ON/OFF | Enable control | TTL-compatible logic input: <1.2 V = active, >1.4 V = shutdown; 50 μA standby draw when pulled high |
| TAB | Thermal & electrical connection | Internally connected to GND; must be soldered to ≥1 in² PCB copper area for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-A NPN power switch | Eliminates need for external MOSFET and gate driver; reduces BOM count and layout complexity |
| Cycle-by-cycle current limiting | Protects against short-circuit and overload without latch-up; maintains regulation during transient overloads |
| Fixed 52-kHz oscillator | Enables predictable EMI profile and consistent inductor sizing; avoids variable-frequency noise spread |
| TTL-compatible ON/OFF control | Allows direct interfacing with microcontrollers or logic sequencers without level-shifting circuitry |
| Thermal shutdown with hysteresis | Shuts down at ~150°C junction, restarts after ~20°C cooldown - prevents thermal runaway in enclosed systems |
Applications
| Industrial Motor Drive Power Supply | Network Equipment DC-DC Conversion |
|---|---|
Use Scenario: Provides stable 5-V rail for microcontroller, gate drivers, and sensors in 24-V-powered brushless DC motor controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck converter regulating main logic supply; operates continuously at 3-A peak load during acceleration phases. Use Value: Replaces linear regulator + heatsink assembly, reducing board area by >60% and eliminating thermal throttling during burst-load operation. |
Use Scenario: Generates 5-V auxiliary power from 48-V PoE midspan or server backplane in switches and routers. IC Role / Device Role / Timing Role: Secondary buck stage converting intermediate bus voltage; synchronized via fixed 52-kHz frequency for predictable filter design. Use Value: Delivers 3-A output with <50 mVpp ripple using standard 150 µH inductor and 100 µF output capacitor - meets EN55022 Class B conducted EMI limits. |
| Test & Measurement Instrumentation | Home Appliance Control Board |
Use Scenario: Powers analog front-end, ADC reference, and FPGA configuration circuitry in portable multimeters and signal generators. IC Role / Device Role / Timing Role: Low-noise 5-V source with ON/OFF sequencing controlled by system MCU; enters 50-μA standby during sleep mode. Use Value: Achieves ±0.5% output accuracy over −20°C to +70°C ambient via inherent line/load regulation - eliminates need for post-regulation LDO. |
Use Scenario: Supplies 5-V logic power for touch panel controller, display driver, and communication ICs in smart washing machines and ovens. IC Role / Device Role / Timing Role: Main system regulator handling intermittent 2–3 A loads during heating cycles; withstands 40 V transients on 24-V supply rail. Use Value: Withstands automotive-grade load dump surges up to 40 V without external TVS, reducing component count and cost in white-goods BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-5.0 | TO-220-5 package (KC); higher θJA = 32.4°C/W; identical electrical specs and pinout | Better natural convection cooling in open-frame designs; requires mechanical mounting hardware | Select when forced-air cooling is unavailable and heatsink attachment is feasible |
| LM2596SX-5.0 | Higher switching frequency (150 kHz); lower quiescent current (5 mA vs. 10 mA); 3-A rating same | Enables smaller inductors/capacitors; improved light-load efficiency but higher EMI risk | Select when board space is constrained and EMI filtering can be added; not drop-in due to different pinout |
Compared with LM2576SX-5.0/J7001717, the TO-220 LM2576T-5.0 offers easier thermal management in vented enclosures, while the LM2596SX-5.0 trades layout simplicity for compactness and higher-frequency operation - neither is pin-compatible, requiring PCB redesign.
Availability
LM2576SX-5.0/J7001717 is available at Aetrix Electronics and suitable for industrial motor drives, network equipment power supplies, and test instrumentation requiring stable component supply with long-term manufacturability.
Supply support for LM2576SX-5.0/J7001717 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
Texas Instruments is a global semiconductor leader designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.
The LM2576 series was engineered as a robust, easy-to-use SIMPLE SWITCHER® solution for replacing linear regulators in cost-sensitive, medium-power DC-DC applications where reliability and minimal external components are critical.
FAQ
What is the maximum input voltage rating for LM2576SX-5.0/J7001717?
The LM2576SX-5.0/J7001717 has an absolute maximum input voltage of 45 V and a recommended maximum operating input voltage of 40 V. Exceeding 40 V continuously may reduce lifetime or trigger thermal shutdown; the HV variant (LM2576HV) supports up to 60 V but is not interchangeable with LM2576SX-5.0/J7001717.
Does LM2576SX-5.0/J7001717 require an external feedback resistor network?
No. The LM2576SX-5.0/J7001717 is a fixed-output version: its FEEDBACK pin is internally connected to the OUTPUT pin, so no external resistors are needed. This simplifies layout, improves regulation accuracy, and eliminates drift from resistor tolerance or temperature coefficients - a key advantage over adjustable variants like LM2576ADJ.
How does the ON/OFF pin function on LM2576SX-5.0/J7001717?
The ON/OFF pin on LM2576SX-5.0/J7001717 is TTL-compatible: pulling it below 1.2 V enables regulation, while pulling it above 1.4 V disables switching and reduces quiescent current to 50 μA typical. It must never be left floating - tie to GND for always-on operation or drive with MCU GPIO for controlled power sequencing.
What thermal management is required for full 3-A operation of LM2576SX-5.0/J7001717?
To sustain 3-A output at +125°C ambient, LM2576SX-5.0/J7001717 requires ≥1.6 in² of 2-oz copper connected to its exposed thermal tab. With 1 in² copper, θJA drops to 37°C/W; with <0.5 in², derating below 2 A is necessary. Thermal vias under the tab (≥6×0.3-mm) are mandatory to transfer heat to inner layers.
Can LM2576SX-5.0/J7001717 be used in synchronous rectification designs?
No. LM2576SX-5.0/J7001717 is a non-synchronous buck regulator with an internal NPN transistor and requires an external Schottky catch diode (e.g., 1N5822). It lacks gate-drive outputs for a synchronous MOSFET. For synchronous operation, consider TI's LM2596 or newer LMR33630 - both require different PCB layouts and control schemes.
LM2576SX-5.0/J7001717 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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:
- TO-263 (DDPAK-5)
LM2576SX-5.0/J7001717 FAQ
1.How can I place an order for LM2576SX-5.0/J7001717 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576SX-5.0/J7001717 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 LM2576SX-5.0/J7001717 reliable?
The price and inventory of LM2576SX-5.0/J7001717 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576SX-5.0/J7001717 is usually 5 days.
3.What payment methods are accepted for LM2576SX-5.0/J7001717?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576SX-5.0/J7001717 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576SX-5.0/J7001717?
LM2576SX-5.0/J7001717 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576SX-5.0/J7001717 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 LM2576SX-5.0/J7001717?
For technical support, including LM2576SX-5.0/J7001717 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576SX-5.0/J7001717 requirements.
6.How does Aetrix verify that LM2576SX-5.0/J7001717 is sourced from the original manufacturer or authorized distributors?
All LM2576SX-5.0/J7001717 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 LM2576SX-5.0/J7001717 meets industry standards.
7.What is the process for return or replacement of LM2576SX-5.0/J7001717?
All LM2576SX-5.0/J7001717 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576SX-5.0/J7001717, 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 LM2576SX-5.0/J7001717 part is unused and in its original packaging.
Return procedure for LM2576SX-5.0/J7001717:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2576SX-5.0/J7001717 Tags
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