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Texas Instruments LM2576HVSX-ADJ
- Part No.:
- LM2576HVSX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVSX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,954
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Product details
Overview
LM2576HVSX-ADJ from Texas Instruments is a non-synchronous 3-A step-down DC-DC switching regulator in TO-263 (DDPAK) package, supporting 8–60 V input and adjustable 1.23–37 V output with ±4% regulation accuracy, 52-kHz fixed-frequency operation, and TTL-compatible ON/OFF control - used in industrial power supplies and motor drive auxiliary rails.
For engineers reviewing the LM2576HVSX-ADJ datasheet, LM2576HVSX-ADJ pinout, LM2576HVSX-ADJ application, or LM2576HVSX-ADJ equivalent, key selection considerations include its HV input rating (60 V max), thermal performance on PCB copper planes, cycle-by-cycle current limiting, and compatibility with standard off-the-shelf inductors for rapid buck converter design.
Technical Context
The LM2576HVSX-ADJ integrates a high-voltage NPN power switch, fixed-frequency oscillator, error amplifier, and thermal shutdown circuitry into a monolithic buck regulator IC. It operates in continuous conduction mode at full load and transitions to discontinuous mode under light loads without instability.
Its feedback architecture uses an internal 1.23-V reference with ≤500 nA bias current, enabling precise output voltage setting via external resistor dividers. The ON/OFF pin provides active-low enable logic with 1.2-V threshold and 50-μA standby current, supporting controlled power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 60 V - supports wide-range industrial and automotive battery-fed inputs without pre-regulation |
| Output Current | 3 A continuous - delivers full rated load without derating up to 125°C junction temperature |
| Output Voltage Range | 1.23 V to 37 V (adjustable) - set by external resistive divider; 37 V limit ensures safe operation with common 48-V bus derivatives |
| Oscillator Frequency | 52 kHz ±10% - fixed frequency enables predictable EMI filtering and avoids audio-band noise |
| Feedback Reference | 1.23 V ±2.5% - low-drift bandgap reference enables stable output regulation across temperature and line/load |
| Current Limit Threshold | 4.2 A to 6.9 A - cycle-by-cycle peak current limiting protects switch during overload or short-circuit events |
| Standby Quiescent Current | 50 μA typical - enables ultra-low-power shutdown for battery-backed systems |
Pinout & Package
LM2576HVSX-ADJ is housed in a thermally enhanced KTT (DDPAK/TO-263-5) surface-mount package with 10.16 mm × 8.42 mm body size and exposed thermal pad connected internally to GND. Thermal resistance is 42.6°C/W (junction-to-ambient, JEDEC 4-layer board), reducible to 32°C/W with ≥1.6 in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | High-side collector node of internal NPN switch; requires low-inductance connection to input capacitor to minimize switching noise |
| 2 - OUTPUT | Switching node | Emitter of internal NPN switch; connects directly to inductor and catch diode cathode - critical high-dI/dt path requiring tight layout |
| 3 - GROUND | Power and signal reference | Common return for internal circuitry and external components; must be tied to thermal pad and low-impedance ground plane |
| 4 - FEEDBACK | Regulation sense input | High-impedance input monitoring output voltage divider; sensitive to noise - routed away from switching nodes |
| 5 - ON/OFF | Enable control | Active-low TTL-compatible shutdown pin; pulled low to enable, >1.4 V to disable; 50-μA standby draw when disabled |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (8–60 V) | Eliminates need for upstream pre-regulators in 24-V/48-V industrial systems and telecom applications |
| Fixed 52-kHz switching frequency | Simplifies EMI filter design and avoids audible noise; enables use of standard low-cost inductors |
| Thermal shutdown + cycle-by-cycle current limit | Provides robust fault protection without external circuitry - prevents latch-up during overloads or shorts |
| TTL-compatible ON/OFF control | Enables seamless integration with microcontroller GPIOs or system-level power sequencing logic |
| Requires only four external components | Reduces BOM count and layout complexity: input cap, output cap, inductor, and feedback divider |
Applications
| Industrial Motor Drive Power Supply | Test Equipment Auxiliary Rail |
|---|---|
Use Scenario: Providing isolated 15-V/3-A bias supply for gate drivers and op-amps in servo motor inverters. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 48-V bus to stable 15-V rail with fast transient response. Use Value: High efficiency (>88% at 3 A) reduces heat sink requirements; 60-V input rating accommodates 48-V bus transients without dropout. | Use Scenario: Generating programmable 3.3–12-V rails for DUT interface circuitry in automated test equipment. IC Role / Device Role / Timing Role: Adjustable-output DC-DC stage enabling software-configurable voltage levels via DAC-controlled feedback divider. Use Value: ±4% output accuracy and low 500-nA feedback bias current ensure precise voltage setting across temperature and load. |
| Merchant Server PSU Standby Converter | Appliance Main DC-DC Stage |
Use Scenario: Delivering 5-V/3-A standby power from 12-V or 24-V intermediate bus in network server PSUs. IC Role / Device Role / Timing Role: Always-on buck converter powering management controllers and wake-up circuitry during system sleep. Use Value: 50-μA standby current minimizes no-load losses; ON/OFF pin allows synchronized entry/exit from deep sleep states. | Use Scenario: Converting 36-V battery or rectified AC to 12-V main rail for control boards in washing machines and HVAC systems. IC Role / Device Role / Timing Role: High-reliability primary DC-DC regulator operating continuously under variable load and ambient temperature. Use Value: TO-263 thermal pad and 125°C max junction temperature support long-term operation in sealed, high-temp enclosures. |
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-ADJ | TO-220 package; 40-V max input; higher RθJA (32.4°C/W); no thermal pad | Lower-cost through-hole assembly; unsuitable for high-ambient or high-power-density designs | Select when cost-sensitive, lower-volume, or legacy through-hole manufacturing is required |
| LM76003QRNXTQ1 | Synchronous buck; 3.5–60 V input; 3.5-A output; 300 kHz–2.2 MHz adjustable frequency; QFN-16 | Higher efficiency (>92%), smaller solution size, but requires more external components and careful layout | Select when efficiency >90%, compact footprint, or spread-spectrum EMI control is mandatory |
Compared with LM2576T-ADJ, the LM2576HVSX-ADJ offers 50% higher input voltage margin and superior thermal performance on PCB; compared with LM76003QRNXTQ1, it trades efficiency and integration for simplicity, reliability, and minimal external component count in cost-constrained industrial designs.
Availability
LM2576HVSX-ADJ is available at Aetrix Electronics and suitable for industrial motor drives, test equipment power rails, merchant server standby supplies, and appliance main DC-DC stages requiring stable component supply and long-lifecycle availability.
Supply support for LM2576HVSX-ADJ 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 delivering analog and embedded processing solutions, with decades of expertise in power management ICs and broad distribution infrastructure.
The LM2576xx series was designed as a rugged, easy-to-use replacement for linear regulators in medium-power industrial and commercial applications - prioritizing simplicity, fault resilience, and compatibility with standard passive components.
FAQ
What is the maximum input voltage rating for LM2576HVSX-ADJ?
The LM2576HVSX-ADJ has a maximum input voltage rating of 60 V, confirmed in the Absolute Maximum Ratings table and Recommended Operating Conditions section of the TI datasheet SNVS107G. This HV rating distinguishes it from the standard LM2576 (40 V max) and enables direct operation from 48-V industrial buses and telecom power systems with transient headroom.
Can LM2576HVSX-ADJ be used with an output voltage below 1.23 V?
No, the LM2576HVSX-ADJ cannot regulate below 1.23 V because its internal feedback reference voltage is fixed at 1.23 V ±2.5%. The minimum output is set by this reference and the external resistor divider; attempting sub-1.23-V outputs results in loss of regulation. For lower voltages, consider synchronous buck converters like the LM76003.
What is the purpose of the ON/OFF pin on LM2576HVSX-ADJ?
The ON/OFF pin on LM2576HVSX-ADJ provides active-low enable control: pulling it below 1.2 V enables regulation, while raising it above 1.4 V places LM2576HVSX-ADJ in shutdown mode with 50-μA typical standby current. This pin supports power sequencing, remote enable/disable, and low-power sleep modes in system-level designs.
Does LM2576HVSX-ADJ require a heatsink in TO-263 package?
The LM2576HVSX-ADJ in TO-263 (KTT) package does not require an external heatsink when mounted on ≥1.6 in² of 2-oz copper PCB area, achieving θJA ≈ 32°C/W. With smaller copper areas, thermal performance degrades (e.g., 50°C/W at 0.5 in²), potentially necessitating a heatsink at full 3-A load in high-ambient environments.
How many external components does LM2576HVSX-ADJ need for basic operation?
The LM2576HVSX-ADJ requires exactly four external components for functional operation: an input capacitor (≥100 μF), output capacitor (≥100 μF), power inductor (e.g., 150 μH), and two-resistor feedback divider to set output voltage. No additional compensation or protection components are needed for stable operation per TI's reference designs.
LM2576HVSX-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 57V
- 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)
LM2576HVSX-ADJ FAQ
1.How can I place an order for LM2576HVSX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVSX-ADJ 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 LM2576HVSX-ADJ reliable?
The price and inventory of LM2576HVSX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVSX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2576HVSX-ADJ?
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4.How is shipping managed for LM2576HVSX-ADJ?
LM2576HVSX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVSX-ADJ 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 LM2576HVSX-ADJ?
For technical support, including LM2576HVSX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVSX-ADJ requirements.
6.How does Aetrix verify that LM2576HVSX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2576HVSX-ADJ 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 LM2576HVSX-ADJ meets industry standards.
7.What is the process for return or replacement of LM2576HVSX-ADJ?
All LM2576HVSX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVSX-ADJ, 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 LM2576HVSX-ADJ part is unused and in its original packaging.
Return procedure for LM2576HVSX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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