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Texas Instruments LM2576HVS-ADJ/NOPB
- Part No.:
- LM2576HVS-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVS-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:802
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Product details
Overview
LM2576HVS-ADJ/NOPB from Texas Instruments is a non-synchronous step-down DC-DC converter IC designed for high-input-voltage industrial and embedded power supplies. It delivers up to 3 A output current with adjustable output voltage (1.23 V to 37 V), operates from 40 V to 60 V input, features fixed 52-kHz switching frequency, and includes thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - enabling robust 3-A buck regulation in motor drives and test equipment.
For engineers reviewing the LM2576HVS-ADJ/NOPB datasheet, LM2576HVS-ADJ/NOPB pinout, LM2576HVS-ADJ/NOPB application, or LM2576HVS-ADJ/NOPB equivalent, key selection considerations include its HV-rated 60-V max input, ±4% output voltage tolerance over line/load/temperature, 50-μA standby current in shutdown mode, and TO-220/KC package thermal performance with RθJA = 32.4°C/W.
Technical Context
The LM2576HVS-ADJ/NOPB implements a fixed-frequency, current-mode-controlled buck topology with an integrated 3-A NPN switch and internal bandgap reference. Its feedback pin senses 1.23 V ±4%, enabling precise output setting via external resistor divider. The device uses cycle-by-cycle peak current limiting and thermal shutdown for fault protection, and its 52-kHz oscillator (±10%) ensures predictable EMI behavior without external timing components.
It operates in continuous conduction mode under full load but transitions to discontinuous mode at light loads - a behavior confirmed by typical inductor ripple current of 20–30% of IOUT. The ON/OFF pin supports active-low enable logic (VIL ≤ 1.2 V, VIH ≥ 2.2 V) and draws only 50 μA in shutdown, making it suitable for low-power standby applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 40 V to 60 V - supports wide-range industrial DC inputs including 48-V telecom and battery-derived rails. |
| Output Current | Up to 3 A - sufficient for powering FPGA I/O banks, motor gate drivers, or analog subsystems without external pass devices. |
| Output Voltage Range | 1.23 V to 37 V (adjustable) - set via external resistive divider; enables single-BOM flexibility across multiple output requirements. |
| Feedback Reference Voltage | 1.23 V ±4% - defines regulation accuracy; determines output tolerance when combined with resistor tolerance and layout parasitics. |
| Switching Frequency | 52 kHz ±10% - fixed internal oscillator; simplifies EMI filter design and avoids audible noise in sensitive applications. |
| Standby Current | 50 μA typical - enables low-power system-level sleep modes without auxiliary LDOs or discrete enable circuitry. |
| Current Limit Threshold | 4.2 A to 6.9 A - cycle-by-cycle peak current limit protects switch and inductor during overload or short-circuit events. |
| Thermal Resistance (RθJA) | 32.4°C/W (KC package) - defines maximum power dissipation before thermal shutdown; requires minimal heatsinking at ≤2 W loss. |
Pinout & Package
LM2576HVS-ADJ/NOPB is housed in a KC (TO-220, 5-pin) package with exposed tab electrically connected to GROUND for thermal and electrical integrity. The tab must be mounted to a heatsink or large copper pour to maintain junction temperature within −40°C to +125°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | High-side switch collector input | Primary power input node; connects directly to bulk input capacitor with minimal trace inductance to reduce switching noise. |
| 2 - OUTPUT | Switch emitter output | High-frequency switching node; connects to inductor and catch diode anode; requires tight layout to minimize EMI and voltage spikes. |
| 3 - GROUND | Power and signal reference | Common return path for input capacitor, feedback network, and ON/OFF pull-down; must be low-impedance and short to VIN ground. |
| 4 - FEEDBACK | Voltage sense input | High-impedance (50 nA bias) node sensing 1.23 V reference; connects to resistor divider midpoint; sensitive to noise and layout parasitics. |
| 5 - ON/OFF | Enable control input | TTL-compatible digital input; low = active regulation, high = shutdown; 50-μA standby draw allows direct MCU GPIO control. |
| TAB | Thermal & electrical ground | Internally bonded to GROUND; provides primary thermal path to PCB or heatsink; must be soldered to ≥1 in² copper area for optimal RθJA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-A NPN power switch | Eliminates need for external MOSFET and driver; reduces BOM count and layout complexity in space-constrained designs. |
| Fixed 52-kHz oscillator | Enables consistent EMI filtering and eliminates external timing components - critical for repeatable production validation. |
| ±4% output voltage tolerance | Guarantees regulation accuracy across full line, load, and temperature range without trimming or calibration. |
| Cycle-by-cycle current limiting | Prevents inductor saturation and switch failure during transient overloads or output shorts without external sensing circuitry. |
| TTL-compatible ON/OFF control | Allows direct interfacing with microcontrollers or logic sequencers without level-shifting, supporting system-level power sequencing. |
| Thermal shutdown protection | Automatically disables switching if junction temperature exceeds 150°C, preventing permanent damage under sustained overload or poor heatsinking. |
Applications
| Motor Drive Power Supply | Industrial Test Equipment PSU |
|---|---|
Use Scenario: Providing regulated 12-V or 24-V bias to H-bridge gate drivers and position sensor interfaces in servo motor controllers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 48-V bus to stable intermediate rail; handles 3-A pulsed loads with fast transient response. Use Value: High input voltage rating (60 V) accommodates 48-V nominal systems with surge margin; thermal shutdown prevents latch-up during stall conditions. | Use Scenario: Generating programmable 3.3-V to 15-V outputs for DUT power in automated test fixtures with variable load profiles. IC Role / Device Role / Timing Role: Adjustable-output DC-DC stage enabling single-hardware support for multiple DUT voltage requirements. Use Value: ±4% output tolerance and 52-kHz fixed frequency ensure measurement-grade stability and repeatable EMI compliance across test cycles. |
| Appliance Main Power Rail | Merchant Network PSU Auxiliary Rail |
Use Scenario: Converting rectified AC line (≥350 VDC after PFC) down to 12 V for control logic, display backlight, and communication modules in smart appliances. IC Role / Device Role / Timing Role: Isolated secondary-side buck regulator delivering isolated 12-V rail from high-voltage DC bus. Use Value: 60-V max input withstands post-PFC bus variations; low 50-μA standby current meets Energy Star Level VI standby power requirements. | Use Scenario: Generating 5-V or 3.3-V auxiliary rails from 12-V or 48-V server backplane in network switches and storage enclosures. IC Role / Device Role / Timing Role: Secondary-stage point-of-load regulator replacing linear regulators to improve efficiency and reduce heat sink size. Use Value: 3-A capability supports multi-rail SoC power domains; TO-220 package allows manual rework and field replacement in serviceable systems. |
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/NOPB | 40-V max input (vs. 60 V); identical pinout, feedback, and thermal specs. | Suitable only for ≤40-V input systems; not rated for 48-V telecom or industrial HV rails. | Select when input never exceeds 40 V and cost sensitivity outweighs HV margin. |
| LM76003QRNLRQ1 | Synchronous 3.5-A buck with 3.5–60-V input, 300-kHz–2.2-MHz adjustable frequency, and integrated high-/low-side MOSFETs. | Higher efficiency (>90%), smaller solution size, and automotive AEC-Q100 qualification - but requires more complex layout and external compensation. | Choose for new designs requiring higher efficiency, smaller footprint, or automotive qualification; not drop-in compatible. |
Compared with LM2576HVS-ADJ/NOPB, LM2576T-ADJ/NOPB offers identical functionality at lower voltage rating and cost, while LM76003QRNLRQ1 delivers superior efficiency and integration at the expense of design complexity and non-pin-compatibility.
Availability
LM2576HVS-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, test equipment power supplies, appliance main rails, and merchant network auxiliary rails requiring stable component supply and long-term manufacturability.
Supply support for LM2576HVS-ADJ/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 leadership in power conversion ICs.
The LM2576 series was designed as a rugged, easy-to-use replacement for linear regulators in medium-power industrial and embedded applications - prioritizing simplicity, fault resilience, and wide-input-voltage operation over ultra-high efficiency.
FAQ
What is the maximum input voltage rating for LM2576HVS-ADJ/NOPB?
The LM2576HVS-ADJ/NOPB has a maximum input voltage rating of 60 V, verified per Absolute Maximum Ratings (Section 6.1) and Recommended Operating Conditions (Section 6.3) in the TI SNVS107G datasheet. This HV rating distinguishes it from the standard LM2576 (40 V max) and enables use in 48-V industrial, telecom, and battery-powered systems with surge margin. Exceeding 60 V risks permanent damage.
How does the feedback pin (Pin 4) function in LM2576HVS-ADJ/NOPB?
The feedback pin (Pin 4) of LM2576HVS-ADJ/NOPB senses the voltage divider output and compares it to an internal 1.23-V ±4% reference. When used in adjustable mode, it sets VOUT = 1.23 × (1 + R2/R1). Its 50-nA bias current minimizes divider error, and its high impedance makes it sensitive to noise - requiring short traces, ground shielding, and placement near the output capacitor. This behavior is confirmed in Section 6.9 and Figure 7-4 of the datasheet.
Can LM2576HVS-ADJ/NOPB be used in synchronous rectification configurations?
No, LM2576HVS-ADJ/NOPB cannot be used in synchronous rectification configurations. It is a non-synchronous buck converter with an integrated NPN transistor and requires an external Schottky catch diode (e.g., 1N5822). The datasheet explicitly states it lacks a synchronous rectifier driver or complementary low-side switch. Synchronous operation requires devices like the LM76003, which integrates both high- and low-side MOSFETs.
What thermal performance can be expected from LM2576HVS-ADJ/NOPB in the KC package?
In the KC (TO-220) package, LM2576HVS-ADJ/NOPB has a junction-to-ambient thermal resistance (RθJA) of 32.4°C/W when mounted on a standard 4-layer JEDEC board. With proper heatsinking or ≥1 in² copper pour, it sustains continuous 3-A output at 12-V output from 48-V input (≈2.4 W dissipation) without exceeding 125°C junction temperature. Thermal shutdown activates at 150°C, as specified in Section 6.1 and 6.4.
Is LM2576HVS-ADJ/NOPB RoHS compliant and lead-free?
Yes, LM2576HVS-ADJ/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix in the part number explicitly denotes "No Lead (Pb)-Free", confirming compliance with EU RoHS Directive 2011/65/EU and TI's green packaging standards. This is documented in TI's official orderable addendum and packaging information tables (Section 10 of SNVS107G).
LM2576HVS-ADJ/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:
- 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)
LM2576HVS-ADJ/NOPB FAQ
1.How can I place an order for LM2576HVS-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVS-ADJ/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 LM2576HVS-ADJ/NOPB reliable?
The price and inventory of LM2576HVS-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVS-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVS-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVS-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
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LM2576HVS-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVS-ADJ/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 LM2576HVS-ADJ/NOPB?
For technical support, including LM2576HVS-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVS-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2576HVS-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVS-ADJ/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 LM2576HVS-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVS-ADJ/NOPB?
All LM2576HVS-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVS-ADJ/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 LM2576HVS-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVS-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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