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Texas Instruments LM2576HVS-ADJ
- Part No.:
- LM2576HVS-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVS-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,366
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Product details
Overview
LM2576HVS-ADJ 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 - used in motor drives and test equipment requiring robust buck regulation.
For engineers reviewing the LM2576HVS-ADJ datasheet, LM2576HVS-ADJ pinout, LM2576HVS-ADJ application, or LM2576HVS-ADJ equivalent, key selection criteria include its HV-rated input range (60 V max), ±4% output voltage tolerance over line/load/temperature, 50-μA standby current in shutdown mode, and compatibility with standard off-the-shelf inductors - critical for reliable 3-A buck conversion in space-constrained or thermally demanding designs.
Technical Context
The LM2576HVS-ADJ implements a fixed-frequency, pulse-width-modulated (PWM) buck topology with an integrated 3-A NPN power switch and internal bandgap reference. Its error amplifier compares feedback voltage against a precise 1.23-V reference, driving a 52-kHz oscillator and current-limited driver stage.
Functional protection includes cycle-by-cycle peak current limiting (ICL = 4.2–6.9 A), thermal shutdown activation at ~150°C junction temperature, and undervoltage lockout inherent to the ON/OFF pin logic thresholds (VIH ≥ 2.2 V, VIL ≤ 1.2 V). The device operates only in continuous or discontinuous conduction mode - no forced CCM or DCM control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 40 V to 60 V - supports wide-range industrial DC inputs including rectified 48-VAC or battery stacks without external pre-regulation. |
| Output Voltage Range | 1.23 V to 37 V (adjustable via external resistor divider) - enables flexible rail generation across analog, digital, and mixed-signal subsystems. |
| Output Current | Up to 3 A DC - sufficient for powering microcontrollers, sensors, actuators, or small FPGAs directly from high-voltage bus rails. |
| Switching Frequency | Fixed 52 kHz (±10%) - simplifies EMI filtering design with predictable noise spectrum and avoids audible frequencies. |
| Feedback Reference Voltage | 1.23 V ±4% - sets output accuracy baseline; actual VOUT = 1.23 × (1 + R1/R2), enabling precise programmability with standard resistors. |
| Standby Quiescent Current | 50 μA typical - allows low-power system sleep modes without significant battery drain in always-on applications. |
| Thermal Resistance (KC) | RθJA = 32.4°C/W - requires minimal heatsinking at full load when mounted on 2-oz copper with adequate PCB area. |
Pinout & Package
LM2576HVS-ADJ is supplied in the KC (TO-220, 5-pin) package with exposed tab electrically connected to GROUND - intended for direct mechanical and thermal attachment to heatsinks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side transistor collector; must be decoupled with low-ESR capacitor within 5 mm to minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switching node | Drives external inductor and catch diode; high dv/dt node requiring tight layout and ground plane clearance to reduce EMI. |
| 3 - GROUND | Power and signal reference | Low-impedance return path for input capacitor, feedback network, and ON/OFF control; shared with exposed tab for thermal conduction. |
| 4 - FEEDBACK | Voltage sense input | High-impedance node (Ib = 50 nA typ); connects to resistor divider midpoint - sensitive to noise, must be routed away from OUTPUT and VIN traces. |
| 5 - ON/OFF | Enable control | TTL-compatible digital input; >2.2 V disables regulator (50-μA standby), <1.2 V enables operation - supports remote power sequencing and fault shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-A NPN switch | Eliminates need for external high-current transistor and gate driver - reduces BOM count and layout complexity in buck converters. |
| Fixed 52-kHz oscillator | Enables consistent filter design and predictable EMI behavior without external timing components or frequency tuning. |
| Cycle-by-cycle current limiting | Prevents destructive overcurrent during short circuits or startup surges - maintains safe inductor current ramp without latch-off. |
| Thermal shutdown protection | Automatically disables switching above ~150°C junction temperature - protects IC and PCB from thermal runaway under overload or poor heatsinking. |
| Adjustable output via resistor divider | Supports any output between 1.23 V and 37 V using two standard resistors - avoids stocking multiple fixed-output variants. |
Applications
| Motor Drive Power Supply | Industrial Test Equipment PSU |
|---|---|
Use Scenario: Powers gate drivers and logic circuitry in 24–48 V DC motor controllers where input voltage varies widely due to battery discharge or rectified AC. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 5 V or 12 V to MCU, encoder interface, and PWM logic - operating continuously under dynamic load transients. Use Value: Withstands 60 V input transients and delivers 3 A without derating, reducing need for upstream TVS or pre-regulators in harsh environments. |
Use Scenario: Supplies variable analog and digital rails in benchtop multimeters, oscilloscope front-ends, and calibration sources requiring low-noise, stable outputs. IC Role / Device Role / Timing Role: Adjustable-output buck stage generating precision 3.3 V, 5 V, or 15 V rails from a common 48 V DC bus - configured with low-tolerance resistors for <±1% output accuracy. Use Value: Fixed 52-kHz switching enables deterministic EMI filtering; ±4% output tolerance ensures measurement-grade stability across temperature and load. |
| Appliance Mainboard Power | Server Rack PSU Auxiliary Rail |
Use Scenario: Generates 3.3 V or 5 V for control boards in commercial HVAC units, washing machines, and refrigerators powered from rectified 36–60 V DC bus. IC Role / Device Role / Timing Role: High-reliability primary DC-DC converter replacing linear regulators - handles surge currents during compressor or valve actuation. Use Value: Integrated current limiting and thermal shutdown prevent field failures during motor startup surges; TO-220 package allows direct heatsink mounting in confined enclosures. |
Use Scenario: Provides isolated auxiliary 12 V or 15 V rail for fan controllers, LED indicators, and monitoring ICs in modular server PSUs where main 12 V rail may be unstable during transient loads. IC Role / Device Role / Timing Role: Standalone buck regulator fed from bulk 48 V intermediate bus - enabled/disabled via system management controller through ON/OFF pin. Use Value: 50-μA standby current minimizes quiescent loss during system sleep; 60 V input rating accommodates 48 V bus overshoots per ATX12VO or Open Compute specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM76003 | 3.5–60 V input, 3.5-A synchronous buck; integrated high-/low-side MOSFETs; 300 kHz–2.2 MHz adjustable frequency. | Higher efficiency (>90%), smaller solution size, but requires more complex layout and external compensation. | Preferred for new designs needing higher efficiency or compact footprint; not drop-in - requires redesign of inductor, loop compensation, and layout. |
| LMR51430 | 4.5–36 V input, 3-A synchronous buck; integrated FETs; 500 kHz/1.1 MHz fixed frequency; lower IQ (26 μA). | Lower input voltage ceiling; unsuitable for 48 V+ systems; better light-load efficiency and faster transient response. | Only viable if input stays ≤36 V; offers superior efficiency and smaller solution than LM2576HVS-ADJ but lacks HV capability. |
Compared with LM2576HVS-ADJ, LM76003 delivers higher efficiency and smaller total solution size at the cost of increased design complexity, while LMR51430 provides modern synchronous performance but cannot replace LM2576HVS-ADJ in 48–60 V input applications due to its 36 V absolute maximum input rating.
Availability
LM2576HVS-ADJ is available at Aetrix Electronics and suitable for motor drives, industrial test equipment, appliance mainboards, and server auxiliary power supplies requiring stable component supply across long production lifecycles.
Supply support for LM2576HVS-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and consumer reach.
The LM2576 series belongs to TI's SIMPLE SWITCHER® power converter family - engineered for ease-of-use in cost-sensitive, high-reliability DC-DC applications where minimal external components and proven ruggedness outweigh advanced features like synchronization or PMBus control.
FAQ
What is the maximum input voltage rating for LM2576HVS-ADJ?
The LM2576HVS-ADJ has an absolute maximum input voltage of 63 V and a recommended operating maximum of 60 V. This HV rating distinguishes it from standard LM2576 variants (max 40 V), making it suitable for 48 V battery systems, rectified 36 VAC supplies, and industrial DC buses with transient overvoltage margins. Always observe derating guidelines in the datasheet for reliability at elevated temperatures.
Can LM2576HVS-ADJ be used in synchronous rectification configurations?
No, LM2576HVS-ADJ is a non-synchronous buck regulator with an integrated NPN transistor and requires an external catch diode (e.g., Schottky 1N5822). It does not support synchronous rectification because it lacks a complementary low-side MOSFET driver or control logic for gate timing. For synchronous operation, consider TI's LM76003 or LMR51430 instead.
What is the purpose of the ON/OFF pin on LM2576HVS-ADJ?
The ON/OFF pin (Pin 5) provides TTL-compatible enable/disable control: applying ≥2.2 V places LM2576HVS-ADJ in shutdown mode with 50-μA typical standby current, while ≤1.2 V enables normal regulation. This pin supports remote power sequencing, system-level fault shutdown, and low-power sleep states - and must never be left floating to avoid erratic operation.
How accurate is the output voltage of LM2576HVS-ADJ across temperature and load?
The LM2576HVS-ADJ guarantees ±4% output voltage accuracy over full line (40–60 V), load (0.5–3 A), and temperature (−40°C to +125°C) conditions - based on its 1.23-V ±4% internal reference and amplifier gain error. External resistor tolerance and layout parasitics contribute additional error; use 0.5% or better resistors in the feedback divider to achieve ≤±1.5% total system accuracy.
Does LM2576HVS-ADJ require a minimum load to maintain regulation?
No, LM2576HVS-ADJ does not require a minimum load for stable operation. It functions correctly from zero load up to 3 A, transitioning naturally between continuous and discontinuous conduction modes as load decreases. However, light-load efficiency drops due to fixed switching losses, and output ripple may increase slightly below ~200 mA - which can be mitigated with an optional LC post-filter as shown in Figure 7-4 of the datasheet.
LM2576HVS-ADJ 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:
- 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)
LM2576HVS-ADJ FAQ
1.How can I place an order for LM2576HVS-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVS-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 LM2576HVS-ADJ reliable?
The price and inventory of LM2576HVS-ADJ 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 is usually 5 days.
3.What payment methods are accepted for LM2576HVS-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVS-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVS-ADJ?
LM2576HVS-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVS-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 LM2576HVS-ADJ?
For technical support, including LM2576HVS-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVS-ADJ requirements.
6.How does Aetrix verify that LM2576HVS-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2576HVS-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 LM2576HVS-ADJ meets industry standards.
7.What is the process for return or replacement of LM2576HVS-ADJ?
All LM2576HVS-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVS-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 LM2576HVS-ADJ part is unused and in its original packaging.
Return procedure for LM2576HVS-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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