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Texas Instruments LM2576T-15/NOPB
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- Part No.:
- LM2576T-15/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-15/NOPB.pdf
- Description:
- IC REG BUCK 15V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:411
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Product details
Overview
LM2576T-15/NOPB from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC switching regulator in TO-220-5 package, delivering fixed 15-V output with ±4% tolerance over line and load, 40-V max input voltage, and 52-kHz fixed-frequency operation. It replaces linear regulators in medium-power industrial power supplies where thermal efficiency and minimal external component count are critical.
For engineers reviewing the LM2576T-15/NOPB datasheet, LM2576T-15/NOPB pinout, LM2576T-15/NOPB application, or LM2576T-15/NOPB equivalent, key selection criteria include its 3-A continuous output capability, TTL-compatible ON/OFF control with 50-μA standby current, cycle-by-cycle current limiting, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576T-15/NOPB integrates a high-side NPN switch, fixed-frequency oscillator, error amplifier, and feedback comparator in a single monolithic IC. Its architecture uses pulse-width modulation (PWM) with internal 52-kHz oscillator and cycle-by-cycle peak current limiting to regulate output voltage without requiring external compensation.
It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads. Shutdown is achieved via TTL-level logic on the ON/OFF pin (high = OFF), enabling low-quiescent-current standby mode with typical 50-μA supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full operating temperature (−40°C to +125°C) and load (0.5–3 A) |
| Max Input Voltage | 40 V - defines absolute maximum DC input; requires derating for sustained operation near limit |
| Output Current | 3 A continuous - supports medium-power loads without external current boosting |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity |
| Efficiency | 88% at VIN = 18 V, IOUT = 3 A - significantly reduces heat sink requirements vs. linear regulators |
| Standby Current | 50 μA typical at ON/OFF = 5 V - enables low-power system sleep modes without auxiliary LDOs |
| Saturation Voltage | 1.8 V max at IOUT = 3 A - determines minimum dropout and impacts thermal dissipation in high-VIN applications |
| Feedback Reference | Not applicable - fixed-output version; no external resistor divider required |
Pinout & Package
LM2576T-15/NOPB uses the KC (TO-220-5) package with 10.16 mm × 8.51 mm body size and integral heat slug connected to GND. The tab is electrically tied to ground and must be thermally coupled to a heatsink or PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input power supply connection | Connects directly to collector of internal NPN switch; requires short, low-inductance path to input capacitor |
| 2 - OUTPUT | Switching node / power transistor emitter | Drives external inductor and catch diode; high dv/dt node requiring careful layout to minimize EMI |
| 3 - GROUND | Power and signal reference | Common return for input/output capacitors and feedback; must be low-impedance path to minimize noise coupling |
| 4 - FEEDBACK | Regulation sense input | Internally connected to 15-V reference; left unconnected (NC) for fixed-output versions |
| 5 - ON/OFF | Enable/disable control input | TTL-compatible; <1.2 V = active, >1.4 V = shutdown; 50-μA standby current when high |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15-V output | Eliminates external resistor divider, reducing BOM count and improving long-term stability vs. adjustable variants |
| 3-A integrated switch | Supports full-load operation without external MOSFETs or current-sharing circuits |
| 52-kHz fixed-frequency PWM | Enables predictable EMI spectrum and simplifies filter design using standard 100–150 µH inductors |
| TTL shutdown with 50-μA standby | Allows microcontroller-controlled power sequencing and ultra-low-power sleep states |
| Cycle-by-cycle current limiting | Provides robust overload and short-circuit protection without external sensing components |
| Thermal shutdown | Automatically disables switching above 150°C junction temperature, preventing permanent damage |
Applications
| Industrial Motor Drives | Network Equipment Power |
|---|---|
|
Use Scenario: Powering gate drivers and logic circuitry in 24-V DC-fed brushless motor controllers. IC Role / Device Role / Timing Role: Primary 15-V intermediate rail regulator converting 40-V bus to stable logic supply. Use Value: Delivers 3-A continuous current with 88% efficiency, eliminating need for heatsinks in compact enclosures. |
Use Scenario: Generating 15-V bias for PoE midspan injectors and Ethernet switch PHYs. IC Role / Device Role / Timing Role: Secondary regulated rail supporting analog front-end and isolation interface circuitry. Use Value: Fixed 15-V output ensures consistent voltage margin for IEEE 802.3af/at compliance testing. |
| Appliance Control Boards | Test Instrumentation Supplies |
|
Use Scenario: Supplying 15-V rails for microcontrollers, display drivers, and sensor interfaces in smart home appliances. IC Role / Device Role / Timing Role: Main DC-DC converter replacing linear regulators to reduce thermal stress on densely packed PCBs. Use Value: 52-kHz switching frequency avoids audible noise while maintaining compatibility with low-cost ceramic input capacitors. |
Use Scenario: Providing clean, stable 15-V power for precision op-amp stages and ADC reference buffers in bench multimeters. IC Role / Device Role / Timing Role: Low-noise intermediate supply with tight ±4% regulation across temperature and load. Use Value: Internal current limiting and thermal shutdown ensure safe operation during probe short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HV-15/NOPB | 60-V max input vs. 40 V; identical pinout, output, and thermal specs | Required for 48-V telecom or industrial bus inputs where transient spikes exceed 40 V | Select when input voltage may reach ≥45 V; otherwise LM2576T-15/NOPB offers lower cost and same performance at ≤40 V |
| LMR51430RGER | Synchronous buck, 4.5–36-V input, 3-A, 500-kHz/1.1-MHz, smaller 3-mm × 2-mm WQFN | Higher efficiency (>92%), smaller footprint, but requires external compensation and more complex layout | Choose for space-constrained, high-efficiency designs; LM2576T-15/NOPB remains optimal for cost-sensitive, thermally tolerant, through-hole applications |
Compared with LM2576HV-15/NOPB, the LM2576T-15/NOPB trades input voltage headroom for lower cost and qualification maturity; compared with LMR51430RGER, it sacrifices efficiency and size for simplicity, ruggedness, and ease of prototyping with through-hole assembly.
Availability
LM2576T-15/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, network equipment power supplies, and appliance control boards requiring stable component supply, long-lifecycle support, and proven reliability in harsh environments.
Supply support for LM2576T-15/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in reliable, high-volume power conversion ICs.
The LM2576 series was designed as a robust, easy-to-use replacement for linear regulators in medium-power industrial and commercial applications-emphasizing fault protection, minimal external components, and thermal resilience.
FAQ
What is the maximum input voltage rating for LM2576T-15/NOPB?
The LM2576T-15/NOPB has an absolute maximum input voltage of 45 V, but its recommended operating condition is up to 40 V DC. Exceeding 40 V continuously risks thermal overstress and reduced lifetime; for 48-V systems, TI recommends the LM2576HV-15/NOPB variant rated for 60-V input.
Does LM2576T-15/NOPB require external feedback resistors?
No. The LM2576T-15/NOPB is a fixed-output version with internal 15-V feedback reference. Pin 4 (FEEDBACK) is not connected internally and must be left unconnected or tied to ground per datasheet guidance-no external resistor divider is needed or supported.
How does the ON/OFF pin function on LM2576T-15/NOPB?
The ON/OFF pin (Pin 5) enables TTL-compatible shutdown: logic high (>1.4 V) disables switching and reduces quiescent current to 50 μA typical; logic low (<1.2 V) activates regulation. It must never be left floating and should be pulled to GND via a 10-kΩ resistor for default-on operation.
What thermal considerations apply to LM2576T-15/NOPB in TO-220 package?
In the KC (TO-220-5) package, LM2576T-15/NOPB has a junction-to-ambient thermal resistance (RθJA) of 32.4°C/W with proper heatsinking. Without a heatsink, power dissipation is limited to ~1.5 W at 25°C ambient; for 3-A operation at high VIN–VOUT differentials, a minimum 15 cm² copper pour or aluminum heatsink is required to maintain TJ < 125°C.
Can LM2576T-15/NOPB drive a 3-A load continuously at 40-V input?
Yes, LM2576T-15/NOPB is specified for 3-A continuous output across its full operating range, including at 40-V input. However, efficiency drops to ~75% and power dissipation rises significantly-requiring adequate heatsinking and airflow. Derating to 2.5 A is recommended for sealed enclosures above 60°C ambient.
LM2576T-15/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5
- 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):
- 15V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2576T-15/NOPB FAQ
1.How can I place an order for LM2576T-15/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-15/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 LM2576T-15/NOPB reliable?
The price and inventory of LM2576T-15/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-15/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576T-15/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-15/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-15/NOPB?
LM2576T-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-15/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 LM2576T-15/NOPB?
For technical support, including LM2576T-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-15/NOPB requirements.
6.How does Aetrix verify that LM2576T-15/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576T-15/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 LM2576T-15/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576T-15/NOPB?
All LM2576T-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-15/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 LM2576T-15/NOPB part is unused and in its original packaging.
Return procedure for LM2576T-15/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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