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Texas Instruments LM2575HVSX-ADJ
- Part No.:
- LM2575HVSX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575HVSX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,249
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Product details
Overview
LM2575HVSX-ADJ from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with adjustable output (1.23V to 37V), 52 kHz fixed-frequency operation, and high-voltage input capability up to 60V. It integrates PWM controller, power switch, and protection circuitry, enabling compact, efficient DC/DC conversion in industrial power supplies and battery-fed systems.
For engineers reviewing the LM2575HVSX-ADJ datasheet, LM2575HVSX-ADJ pinout, LM2575HVSX-ADJ application, or LM2575HVSX-ADJ equivalent, key selection considerations include its 60V max input rating, ±4% output voltage tolerance over line/load/temperature, thermal shutdown and cycle-by-cycle current limiting, TO-263 (DDPAK) package thermal performance (θJA = 37°C/W with 1 in² copper), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575HVSX-ADJ implements a fixed-frequency (52 kHz) current-mode PWM architecture with internal oscillator, error amplifier, and N-channel MOSFET switch. Feedback is taken from the ADJ pin referencing an internal 1.23V bandgap reference, enabling precise output programming via external resistor divider.
It features TTL-compatible ON/OFF control (ISTBY = 50 μA typical), built-in thermal shutdown (TJ = 150°C), and peak current limiting (ICL = 1.7–3.2 A). The device operates across −40°C to +125°C junction temperature and requires only four external components: input capacitor, output capacitor, catch diode, and inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports full-load operation without derating at TA ≤ 55°C with proper PCB copper area |
| Input Voltage Range | 4.75 V to 60 V - enables direct regulation from 48 V telecom rails or unregulated 36–54 V battery stacks |
| Output Voltage Range | 1.23 V to 37 V - set by external R1/R2 divider; feedback voltage accuracy ±4% ensures stable output under worst-case conditions |
| Switching Frequency | 52 kHz (±10%) - fixed frequency simplifies EMI filtering and allows use of low-cost, high-saturation-current inductors |
| Efficiency | 77% at 12 VIN/5 VOUT/1 A - reduces thermal load vs. linear regulators; peak efficiency exceeds 88% at higher VOUT |
| Thermal Resistance | θJA = 37°C/W - achievable with ≥1 in² PCB copper pour under DDPAK/TO-263 package; enables high-power density without heatsink |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or ambient overheating |
Pinout & Package
LM2575HVSX-ADJ is housed in a 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring exposed thermal pad for enhanced heat dissipation. Pin 1 is Input (VIN), Pin 2 is Output (VOUT), Pin 3 is Ground (GND), Pin 4 is Feedback (ADJ), and Pin 5 is ON/OFF control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power Input | Accepts 4.75–60 V DC; requires local 100 μF/75 V aluminum electrolytic bypass capacitor |
| 2 - VOUT | Regulated Output | Drives 1 A load; connects to inductor and catch diode anode; sensitive to layout parasitics |
| 3 - GND | Power & Signal Reference | Common return for input/output capacitors, feedback network, and thermal pad; must be low-impedance single-point ground |
| 4 - ADJ | Feedback Input | References internal 1.23 V bandgap; sets output via R1–R2 divider; trace must be short and noise-shielded |
| 5 - ON/OFF | Enable Control | TTL-compatible shutdown input; <1.0 V disables regulator (50 μA standby); >2.2 V enables normal operation |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Support | 60 V absolute maximum input enables direct regulation from 48 V industrial buses without pre-regulation |
| Integrated Power Switch | On-chip N-MOSFET eliminates need for external high-side switch and gate driver, reducing BOM count and layout complexity |
| Fixed-Frequency Operation | 52 kHz oscillator provides predictable EMI spectrum and simplifies filter design versus variable-frequency alternatives |
| Low-Quiescent-Current Shutdown | 50 μA standby current (typical) extends battery life in always-on systems requiring periodic wake-up |
| Robust Protection Suite | Combined thermal shutdown and cycle-by-cycle current limiting ensures safe operation under fault conditions without external sensing |
Applications
| Industrial 24/48 V Power Conversion | Automotive Body Control Module Supply |
|---|---|
|
Use Scenario: Converting 48 V battery or PoE++ supply to 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1 A output; replaces discrete switcher designs with higher component count. Use Value: Eliminates need for external high-voltage MOSFET and driver; 60 V input rating avoids pre-regulator stage, saving board space and cost. |
Use Scenario: Generating 5 V rail from vehicle 12–42 V battery for microcontroller, CAN transceiver, and LED drivers in BCMs. IC Role / Device Role / Timing Role: Main system power IC providing stable 1 A output with wide input range and automotive-grade thermal robustness. Use Value: −40°C to +125°C operation and integrated current/thermal protection ensure reliability across cold cranking and engine bay temperatures. |
| Programmable Lab Power Supply | Telecom Remote Radio Unit (RRU) Bias |
|
Use Scenario: Adjustable-output bench supply (1.23–37 V) with digital potentiometer-based voltage setting and current monitoring. IC Role / Device Role / Timing Role: Core adjustable buck regulator; feedback loop configured for precision voltage programming and stability. Use Value: ±4% output tolerance and 1.23 V reference enable accurate, repeatable voltage setting without trimming; 52 kHz frequency allows small passive size. |
Use Scenario: Providing bias voltage to GaN power amplifiers in 4G/5G RRUs where input varies from 24–60 V depending on site infrastructure. IC Role / Device Role / Timing Role: High-input-voltage buck converter delivering stable 12 V or 28 V at 1 A to PA stages. Use Value: 60 V max input and 37 V adjustable output support diverse RRU architectures; TO-263 thermal performance sustains full load in confined 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 |
|---|---|---|---|
| LM2575T-ADJ | TO-220 package; lower max input (45 V); θJA = 65°C/W (no heatsink) | Suitable for lower-power, non-high-voltage applications where PCB space permits through-hole mounting | Select when 45 V input ceiling is sufficient and thermal budget allows larger heatsink or lower ambient |
| LM2596SX-ADJ | Higher switching frequency (150 kHz); 3 A output; 40 V max input; SO-8EP package | Better suited for compact, high-current designs needing smaller inductors but limited to ≤40 V input | Choose for higher output current or smaller magnetics; avoid if input exceeds 40 V or 52 kHz EMI profile is required |
Compared with LM2575T-ADJ, LM2575HVSX-ADJ delivers 15 V higher input headroom and superior thermal performance in surface-mount form; versus LM2596SX-ADJ, it trades higher current and frequency for extended HV capability and proven 52 kHz EMI behavior in legacy industrial systems.
Availability
LM2575HVSX-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, programmable lab equipment, and telecom remote radio units requiring stable component supply across long production lifecycles.
Supply support for LM2575HVSX-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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2575HV product line was designed for rugged, high-input-voltage DC/DC conversion in industrial, telecom, and transportation systems where wide VIN range, integrated protection, and long-term supply stability are critical.
FAQ
What is the maximum input voltage rating for LM2575HVSX-ADJ?
The LM2575HVSX-ADJ has an absolute maximum input voltage rating of 63 V and a recommended operating maximum of 60 V. This high-voltage capability enables direct regulation from 48 V industrial buses, 36–54 V battery systems, and PoE++ sources without requiring a pre-regulator stage. Exceeding 60 V in continuous operation risks exceeding thermal limits or violating safe operating area margins.
How is the output voltage set on LM2575HVSX-ADJ?
The output voltage of LM2575HVSX-ADJ is set using an external resistor divider between VOUT and GND, with the ADJ pin connected to the divider midpoint. The internal 1.23 V reference forces the ADJ pin to that voltage, so VOUT = 1.23 × (1 + R2/R1). For example, R1 = 2.0 kΩ and R2 = 6.12 kΩ yields 5.0 V. Resistor tolerance and temperature coefficient directly impact output accuracy.
Does LM2575HVSX-ADJ require an external catch diode?
Yes, LM2575HVSX-ADJ requires an external Schottky or fast-recovery catch diode connected from VOUT to GND. The diode conducts during the switch-off phase to maintain inductor current continuity. TI recommends devices like MBR340 (40 V, 3 A) for adjustable versions delivering up to 1 A. Diode reverse voltage rating must exceed the maximum input voltage (≥1.25 × VIN(MAX)).
What thermal performance can be expected from LM2575HVSX-ADJ in production layout?
With 1 in² of 2-oz copper connected to the exposed thermal pad, LM2575HVSX-ADJ achieves θJA = 37°C/W. At 1 A load and 12 VIN/5 VOUT, power dissipation is ~0.7 W, resulting in ~26°C rise above ambient - well within the 125°C max junction limit. Reducing copper area increases thermal resistance linearly; 0.5 in² raises θJA to 50°C/W.
Can LM2575HVSX-ADJ be used in synchronous rectification configurations?
No, LM2575HVSX-ADJ is not designed for synchronous rectification. It drives only a single N-channel MOSFET and relies on an external diode for freewheeling. The IC lacks a second gate driver output or timing control for a synchronous FET. Attempting to replace the catch diode with a MOSFET without gate control will cause shoot-through or failure. Use dedicated synchronous buck controllers (e.g., TPS543x series) for that topology.
LM2575HVSX-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:
- 1A
- 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)
LM2575HVSX-ADJ FAQ
1.How can I place an order for LM2575HVSX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVSX-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 LM2575HVSX-ADJ reliable?
The price and inventory of LM2575HVSX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575HVSX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2575HVSX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVSX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVSX-ADJ?
LM2575HVSX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVSX-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 LM2575HVSX-ADJ?
For technical support, including LM2575HVSX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVSX-ADJ requirements.
6.How does Aetrix verify that LM2575HVSX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2575HVSX-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 LM2575HVSX-ADJ meets industry standards.
7.What is the process for return or replacement of LM2575HVSX-ADJ?
All LM2575HVSX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVSX-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 LM2575HVSX-ADJ part is unused and in its original packaging.
Return procedure for LM2575HVSX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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