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Texas Instruments LM2576S-5.0/NOPB
- Part No.:
- LM2576S-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576S-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,903
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Product details
Overview
LM2576S-5.0/NOPB from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC switching regulator in TO-263 (DDPAK) package, delivering fixed 5.0 V output with ±4% tolerance over line and load, 40 V max input voltage, 52 kHz fixed-frequency operation, and integrated thermal shutdown and cycle-by-cycle current limiting - used in industrial power supplies and embedded motor drives.
For engineers reviewing the LM2576S-5.0/NOPB datasheet, LM2576S-5.0/NOPB pinout, LM2576S-5.0/NOPB application, or LM2576S-5.0/NOPB equivalent, key selection criteria include its 3-A continuous output capability, TTL-compatible ON/OFF control with 50 µA standby current, fixed 5-V output without external feedback resistors, and compatibility with standard off-the-shelf inductors for rapid buck converter implementation.
Technical Context
The LM2576S-5.0/NOPB implements a fixed-frequency (52 kHz) pulse-width modulation (PWM) buck topology using an internal NPN power switch and built-in error amplifier with 1.23 V reference. It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads without regulation loss.
Its functional block includes undervoltage lockout (UVLO), cycle-by-cycle peak current limiting (ICL = 4.2–6.9 A), thermal shutdown, and TTL-level ON/OFF control that disables switching while maintaining 50 µA typical quiescent current - enabling low-power standby without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - eliminates need for external feedback divider and simplifies layout. |
| Max Input Voltage | 40 V - supports wide-input industrial and automotive battery-derived rails without external pre-regulation. |
| Output Current | 3 A continuous DC - sufficient for powering microcontrollers, sensors, and logic circuits directly from unregulated sources. |
| Oscillator Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 77% at VIN = 12 V, IOUT = 3 A - significantly higher than linear regulators, reducing thermal design burden and eliminating heatsink in many cases. |
| Standby Current | 50 µA typical at ON/OFF = HIGH - enables low-power system sleep modes without auxiliary LDOs or external switches. |
| Saturation Voltage | 1.4–2.0 V at IOUT = 3 A - defines minimum dropout voltage and impacts thermal dissipation during high-current, low-VIN operation. |
| Thermal Resistance | RθJA = 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
LM2576S-5.0/NOPB uses the KTT (DDPAK/TO-263-5) surface-mount package with 10.16 mm × 8.42 mm body size and thermally enhanced exposed pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Connects to unregulated DC source and high-frequency input capacitor; shortest possible trace required to minimize switching noise coupling. |
| 2 - OUTPUT | Switching node | Drives external inductor and catch diode cathode; high dv/dt node requiring tight loop area and ground plane clearance. |
| 3 - GROUND | Power and signal reference | Low-impedance return path for input cap, output cap, and feedback network; must be tied directly to exposed thermal pad. |
| 4 - FEEDBACK | Regulation sense input | Internally connected to 5-V output; left unconnected for fixed-output versions - no external resistor divider needed. |
| 5 - ON/OFF | Enable/disable control | TTL-compatible input: <1.2 V = active, >1.4 V = shutdown; 50 µA standby current allows direct MCU GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while ensuring ±4% accuracy across temperature and load. |
| Integrated current limiting | Cycle-by-cycle peak current protection (4.2–6.9 A) prevents switch failure during overload or short-circuit without external sensing components. |
| TTL shutdown interface | ON/OFF pin accepts standard logic levels and draws only 50 µA in standby - enables seamless integration into MCU-controlled power sequencing. |
| Thermal shutdown | Automatic recovery after junction temperature exceeds safe limit - protects device and system during sustained overload or poor heatsinking. |
| Standard inductor compatibility | Optimized for widely available off-the-shelf 15–100 µH shielded power inductors - accelerates design and avoids custom magnetics procurement. |
| Low component count | Requires only four external parts (input cap, output cap, inductor, catch diode) - minimizes PCB area and assembly cost versus controller-based solutions. |
Applications
| Industrial Motor Drives | Embedded Network Equipment |
|---|---|
Use Scenario: Powering gate drivers, position sensors, and MCU peripherals in 24-V DC-fed brushless motor controllers. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying logic and analog subsystems from noisy, variable bus voltage. Use Value: 40-V input rating tolerates motor back-EMF transients; 3-A output supports multiple downstream rails via local LDOs; thermal shutdown prevents latch-up during stall conditions. |
Use Scenario: Generating stable 5-V rail for Ethernet PHYs, management MCUs, and fan controllers in merchant-switch PSUs. IC Role / Device Role / Timing Role: Secondary-side non-isolated point-of-load regulator replacing linear solutions to reduce heat in compact chassis. Use Value: 77% efficiency at 3 A cuts board-level thermal load by >60% vs. linear regulator; fixed 5-V output ensures compliance with IEEE 802.3af timing margins. |
| Home Appliance Control Boards | Test & Measurement Instrumentation |
Use Scenario: Supplying 5-V logic for touch panels, relay drivers, and temperature sensors in washing machines and ovens. IC Role / Device Role / Timing Role: Main system regulator converting rectified AC or 24-V DC to clean 5-V for mixed-signal control circuits. Use Value: Wide input range accommodates brownout and surge conditions per IEC 61000-4-11; ON/OFF pin enables energy-saving sleep mode during idle periods. |
Use Scenario: Providing low-noise 5-V bias for precision ADC references, op-amp signal chains, and FPGA configuration in bench multimeters. IC Role / Device Role / Timing Role: High-stability intermediate regulator feeding ultra-low-noise LDOs to analog front-ends. Use Value: ±4% output tolerance and excellent line regulation (<0.2%/V) maintain reference accuracy across varying AC line inputs; fixed frequency simplifies EMI filter design for CE/FCC compliance. |
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 | Same electrical specs but TO-220-5 package with vertical leadform and higher RθJA (32.4°C/W); requires mechanical mounting and heatsink for 3-A operation. | Better suited for prototyping or low-volume assemblies where through-hole mounting and manual heatsinking are acceptable. | Select LM2576T-5.0 when board space permits larger footprint and thermal management via screw-mounted heatsink is preferred over PCB copper area. |
| LMR51430RGER | Synchronous 3-A buck with 4.5–36-V input, 500-kHz/1.1-MHz switching, integrated high/low-side FETs, and 92% efficiency at 3 A - no external diode required. | Targets space-constrained, high-efficiency designs needing lower thermal footprint and faster transient response than legacy non-synchronous architecture. | Choose LMR51430RGER for new designs prioritizing efficiency, size, and modern feature set; LM2576S-5.0/NOPB remains optimal for cost-sensitive, legacy-compatible, or high-voltage-tolerant applications. |
Compared with LM2576T-5.0, LM2576S-5.0/NOPB offers superior thermal performance on PCBs with adequate copper area and eliminates mechanical heatsink hardware; compared with LMR51430RGER, it trades higher efficiency and smaller solution size for wider input voltage range (40 V vs. 36 V), lower BOM cost, and proven field reliability in industrial environments.
Availability
LM2576S-5.0/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, embedded network equipment, and home appliance control boards requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2576S-5.0/NOPB 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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer markets.
The LM2576S-5.0/NOPB belongs to TI's SIMPLE SWITCHER® family of integrated DC-DC regulators, engineered for ease of use, minimal external component count, and robust operation in harsh environments - targeting cost-sensitive, high-reliability power conversion applications.
FAQ
What is the maximum input voltage rating for LM2576S-5.0/NOPB?
The LM2576S-5.0/NOPB has a maximum rated input voltage of 40 V, with absolute maximum stress rating up to 45 V. Operation above 40 V risks permanent damage and violates recommended operating conditions. This rating makes LM2576S-5.0/NOPB suitable for 24-V and 36-V industrial systems with transient headroom, but not for 48-V nominal buses without upstream clamping or regulation.
Does LM2576S-5.0/NOPB require external feedback resistors to set the output voltage?
No, LM2576S-5.0/NOPB does not require external feedback resistors. As a fixed 5.0-V output variant, its internal feedback divider is factory-trimmed and connected internally - pin 4 (FEEDBACK) is unused and must remain unconnected. This eliminates resistor tolerance errors and layout sensitivity, ensuring guaranteed ±4% output accuracy across temperature and load.
How does the ON/OFF pin function on LM2576S-5.0/NOPB?
The ON/OFF pin (pin 5) of LM2576S-5.0/NOPB provides TTL-compatible enable control: pulling it below 1.2 V activates regulation, while raising it above 1.4 V places LM2576S-5.0/NOPB in low-power shutdown with 50 µA typical quiescent current. The pin draws ≤30 µA and can be driven directly by microcontroller GPIOs without level-shifting or buffering.
What thermal considerations apply to LM2576S-5.0/NOPB in the KTT package?
LM2576S-5.0/NOPB in the KTT (DDPAK/TO-263) package has a junction-to-ambient thermal resistance (RθJA) of 42.6°C/W on a JEDEC 4-layer board. To sustain 3-A output at 125°C ambient, ≥1.6 in² of 2-oz copper connected to the exposed thermal pad is required. Reducing copper area increases thermal impedance and may necessitate derating output current or adding forced airflow.
Can LM2576S-5.0/NOPB replace linear regulators like LM7805 in existing designs?
Yes, LM2576S-5.0/NOPB is a direct functional replacement for LM7805 in most applications, offering identical 5-V output but with 3-A capability and 77% efficiency versus <40% for linear regulators at similar loads. Unlike LM7805, it requires an inductor, catch diode, and two capacitors - but eliminates large heatsinks and enables operation from higher input voltages without thermal runaway.
LM2576S-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- 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)
LM2576S-5.0/NOPB FAQ
1.How can I place an order for LM2576S-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576S-5.0/NOPB 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 LM2576S-5.0/NOPB reliable?
The price and inventory of LM2576S-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576S-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576S-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576S-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576S-5.0/NOPB?
LM2576S-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576S-5.0/NOPB 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 LM2576S-5.0/NOPB?
For technical support, including LM2576S-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576S-5.0/NOPB requirements.
6.How does Aetrix verify that LM2576S-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576S-5.0/NOPB 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 LM2576S-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576S-5.0/NOPB?
All LM2576S-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576S-5.0/NOPB, 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 LM2576S-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2576S-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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