My Inquiry
My Account
Texas Instruments LM2576HVSX-ADJ/NOPB
- Part No.:
- LM2576HVSX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVSX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:893
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2576HVSX-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, supports 40 V to 60 V input range (HV version), provides adjustable output from 1.23 V to 37 V (±4% tolerance), and operates at a fixed 52 kHz switching frequency with TTL-compatible ON/OFF control. It is used in motor drives and test equipment where robust buck regulation replaces linear regulators.
For engineers reviewing the LM2576HVSX-ADJ/NOPB datasheet, LM2576HVSX-ADJ/NOPB pinout, LM2576HVSX-ADJ/NOPB application, or LM2576HVSX-ADJ/NOPB equivalent, key selection criteria include its 60 V max input rating, 3-A continuous output capability, thermal shutdown and cycle-by-cycle current limiting, TO-263-5 (KTT) package with exposed thermal pad, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVSX-ADJ/NOPB integrates a 3-A NPN switch, fixed-frequency 52 kHz oscillator, error amplifier, bandgap reference (1.23 V), and thermal shutdown circuitry in a monolithic buck regulator architecture. Its feedback pin senses voltage via external resistor divider, enabling precise output adjustment across 1.23–37 V while maintaining ±4% regulation over line and load.
It operates in discontinuous or continuous conduction mode depending on load and inductor value, uses cycle-by-cycle peak current limiting (ICL = 4.2–6.9 A typical), and enters low-power shutdown (<200 µA standby) when ON/OFF pin exceeds 1.4 V. The internal switch saturation voltage is 1.4–2.0 V at 3 A, directly impacting efficiency at low output voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 40 V to 60 V - supports wide industrial input rails including 48 V telecom and unregulated rectified AC supplies. |
| Output Current | 3 A continuous - sufficient for powering microcontrollers, sensors, and small motors without external current boosting. |
| Output Voltage Range | 1.23 V to 37 V (adjustable) - set by external resistor divider; 1.23 V reference enables precision low-voltage outputs. |
| Switching Frequency | 52 kHz (±10%) - fixed internal oscillator simplifies EMI filtering and avoids external timing components. |
| Feedback Reference Voltage | 1.23 V (±4%) - stable bandgap reference determines output accuracy and temperature drift performance. |
| Standby Quiescent Current | 50 µA typical - enables ultra-low-power shutdown for battery-backed or energy-sensitive systems. |
| Thermal Resistance (RθJA) | 42.6 °C/W (KTT package, JEDEC 4-layer board) - dictates heatsink requirements and maximum ambient operating temperature. |
Pinout & Package
LM2576HVSX-ADJ/NOPB uses the KTT (DDPAK/TO-263-5) surface-mount package with an exposed thermal pad connected internally to GND. Body size is 10.16 mm × 8.42 mm. Thermal pad must be soldered to PCB copper pour for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input | Connects to high-side NPN collector; requires short, low-inductance path to input capacitor to minimize switching noise and voltage spikes. |
| 2 OUTPUT | Switching node | Emitter of internal NPN switch; connects directly to inductor and catch diode cathode - critical for layout EMI control. |
| 3 GROUND | Power and signal reference | Common return for input/output capacitors and feedback network; must tie to thermal pad and minimize loop area with VIN and OUTPUT. |
| 4 FEEDBACK | Regulation sense input | High-impedance input (50 nA bias) monitoring resistor divider midpoint; sets output voltage as VOUT = 1.23 × (1 + R1/R2). |
| 5 ON/OFF | Enable control | TTL-compatible digital input: <1.2 V = active, >1.4 V = shutdown; 50 µA standby current enables simple microcontroller or logic-level control. |
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 in medium-power buck designs. |
| Cycle-by-cycle current limiting | Protects against overload and short-circuit faults without latch-up; allows safe restart after fault clearance. |
| Thermal shutdown protection | Shuts down at ~150°C junction temperature and auto-recovers upon cooling - prevents permanent damage during sustained overload. |
| Fixed 52-kHz oscillator | Enables predictable EMI profile and simplifies filter design; no external timing components required. |
| Standard inductor compatibility | Works with widely available off-the-shelf shielded power inductors (e.g., 150 µH for 12 V → 5 V @ 3 A), accelerating design cycle. |
Applications
| Motor Drives | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Powering gate drivers and logic circuits in 24–48 V DC motor controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated bus voltage to stable 5 V or 12 V for MCU, encoder interface, and isolated gate drive supplies. Use Value: Delivers 3 A continuously with built-in current limiting and thermal protection, eliminating need for discrete current-sense and shutdown circuitry. |
Use Scenario: Generating clean, adjustable supply rails in portable oscilloscopes and multimeters. IC Role / Device Role / Timing Role: Adjustable-output DC-DC stage providing user-selectable analog front-end and display voltages (e.g., ±15 V, +5 V, +3.3 V). Use Value: 1.23 V reference and ±4% output tolerance enable accurate calibration-grade outputs; 52 kHz switching allows compact LC filtering. |
| Industrial Appliances | Merchant Network PSU |
|
Use Scenario: On-board power conversion in HVAC controllers, smart pumps, and commercial kitchen equipment. IC Role / Device Role / Timing Role: Main 3.3 V or 5 V supply for microcontroller, communication interfaces (RS-485, CAN), and sensor signal conditioning. Use Value: 60 V max input withstands surge transients common in industrial 24/48 V systems; TO-263 package supports convection-cooled operation without heatsink. |
Use Scenario: Secondary regulation stage in distributed power architectures for Ethernet switches and PoE injectors. IC Role / Device Role / Timing Role: Point-of-load (POL) converter stepping down intermediate 12 V or 24 V rails to processor I/O and memory voltages. Use Value: High efficiency (>77% at 3 A) reduces thermal load in dense board layouts; ON/OFF pin enables dynamic rail sequencing and power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-ADJ | TO-220-5 (KC) package; lower max input (40 V); identical electrical specs except RθJA = 32.4 °C/W. | Suitable for lower-voltage 24 V systems where through-hole mounting or simpler heatsinking is preferred. | Select when mechanical constraints favor TO-220 or input voltage stays ≤40 V; not rated for 48 V+ transient environments. |
| LM76003QRNXTQ1 | Synchronous buck; 3.5–60 V input; 3.5 A; 300 kHz–2.2 MHz programmable frequency; integrated high/low-side FETs. | Higher efficiency (>90%), smaller solution size, and automotive AEC-Q100 qualification - but requires more complex layout and external compensation. | Choose for new designs needing higher efficiency, smaller footprint, or automotive compliance; LM2576HVSX-ADJ/NOPB remains optimal for cost-sensitive, legacy-compatible, or thermally relaxed applications. |
Compared with LM2576T-ADJ, LM2576HVSX-ADJ/NOPB offers 20 V higher input rating and surface-mount reliability; compared with LM76003QRNXTQ1, it trades efficiency and integration for simplicity, lower BOM cost, and proven field reliability in industrial power supplies.
Availability
LM2576HVSX-ADJ/NOPB is available at Aetrix Electronics and suitable for motor drives, test and measurement equipment, and industrial appliances requiring stable component supply across extended product lifecycles.
Supply support for LM2576HVSX-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 expertise in reliable power conversion ICs.
The LM2576 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in medium-power industrial and embedded applications - emphasizing simplicity, fault protection, and broad input voltage support.
FAQ
What is the maximum input voltage rating for LM2576HVSX-ADJ/NOPB?
The LM2576HVSX-ADJ/NOPB 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. This HV designation distinguishes it from the standard LM2576 (40 V max) and enables use in 48 V systems with headroom for transients. Exceeding 60 V risks permanent damage.
Can LM2576HVSX-ADJ/NOPB be used to generate 3.3 V output?
Yes, LM2576HVSX-ADJ/NOPB can generate 3.3 V output using an external resistor divider on the FEEDBACK pin. With its 1.23 V internal reference, setting R1 = 1.0 kΩ and R2 = 1.7 kΩ yields VOUT ≈ 1.23 × (1 + 1.0/1.7) ≈ 3.3 V. Output accuracy remains within ±4% under full line/load/temperature conditions per datasheet Section 6.9.
Does LM2576HVSX-ADJ/NOPB require an external diode?
Yes, LM2576HVSX-ADJ/NOPB requires an external catch diode (e.g., 1N5822 or Schottky) connected between the OUTPUT pin and GND. As a non-synchronous buck converter, it lacks an integrated low-side switch; the diode provides the return current path during the switch OFF period and must handle peak currents up to 3 A with adequate reverse voltage rating (≥60 V).
What thermal considerations apply to LM2576HVSX-ADJ/NOPB in the KTT package?
LM2576HVSX-ADJ/NOPB in the KTT (TO-263-5) package has RθJA = 42.6 °C/W on a JEDEC 4-layer board. To maintain TJ ≤ 125°C at 3 A output, PCB copper area under the thermal pad must be maximized - increasing from 0.5 to ≥1.6 in² reduces RθJA to 32 °C/W. Without adequate copper, thermal derating is required above ~1.5 A at 25°C ambient.
How does the ON/OFF pin function on LM2576HVSX-ADJ/NOPB?
The ON/OFF pin on LM2576HVSX-ADJ/NOPB enables TTL-compatible shutdown: voltage <1.2 V activates regulation, while >1.4 V forces shutdown with 50 µA typical standby current. It is not latched - returning to low resumes operation. Leaving the pin floating is prohibited; tie to GND via 10 kΩ resistor for always-on operation or drive with MCU GPIO for controlled power sequencing.
LM2576HVSX-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:
- Tape & Reel (TR)
- 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)
LM2576HVSX-ADJ/NOPB FAQ
1.How can I place an order for LM2576HVSX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVSX-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 LM2576HVSX-ADJ/NOPB reliable?
The price and inventory of LM2576HVSX-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 LM2576HVSX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVSX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVSX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVSX-ADJ/NOPB?
LM2576HVSX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVSX-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 LM2576HVSX-ADJ/NOPB?
For technical support, including LM2576HVSX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVSX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2576HVSX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVSX-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 LM2576HVSX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVSX-ADJ/NOPB?
All LM2576HVSX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVSX-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 LM2576HVSX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVSX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2576HVSX-ADJ/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
