My Inquiry
My Account
Texas Instruments LM2575HVSX-ADJ/NOPB
- Part No.:
- LM2575HVSX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575HVSX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:572
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575HVSX-ADJ/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator IC with adjustable output, wide 40–60V input range, ±4% output voltage accuracy, 52 kHz fixed-frequency operation, and integrated thermal shutdown/current limiting. It serves as a high-efficiency replacement for linear regulators in industrial power supplies requiring compact, heat-sink-free 1A DC-DC conversion.
For engineers reviewing the LM2575HVSX-ADJ/NOPB datasheet, LM2575HVSX-ADJ/NOPB pinout, LM2575HVSX-ADJ/NOPB application, or LM2575HVSX-ADJ/NOPB equivalent, key selection criteria include its HV input rating (60V max), feedback reference voltage (1.23 V), ON/OFF control interface, TO-263-5 package thermal performance (θJA = 37°C/W with 1 in² copper), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575HVSX-ADJ/NOPB implements a current-mode controlled buck topology with internal 52 kHz oscillator, cycle-by-cycle current limiting, and thermal shutdown. Its feedback loop references a precise 1.23 V bandgap voltage at the ADJ pin to set output via external resistor divider.
It operates across −40°C to +125°C junction temperature, supports TTL-compatible ON/OFF control (ISTBY = 50 μA typ), and delivers up to 1A continuous load current with saturation voltage ≤1.4 V at IOUT = 1A. Input voltage range is explicitly rated 40–60 V for the HV version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports full-load operation without derating under typical thermal conditions with PCB copper heatsinking. |
| Input Voltage Range | 40 V to 60 V - enables direct regulation from unregulated 48 V telecom or industrial bus rails without pre-regulation. |
| Feedback Reference | 1.23 V ±1.2% - sets output voltage via R1/R2 divider; enables 1.23 V to 37 V (or 57 V transient) adjustable range with ±4% total output tolerance. |
| Switching Frequency | 52 kHz ±10% - fixed internal oscillator simplifies EMI filtering and allows use of low-cost, high-saturation-current inductors. |
| Efficiency | 77% at 12 VIN/5 VOUT/1 A - reduces power loss vs. linear regulators; enables compact layout without forced-air cooling. |
| Standby Current | 50 μA typical - enables low-power shutdown mode via TTL-level ON/OFF pin, critical for battery-backed systems. |
| Thermal Resistance | θJA = 37°C/W (with 1 in² PCB copper) - confirms suitability for high-ambient industrial environments without external heatsink. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or ambient overheating events. |
Pinout & Package
LM2575HVSX-ADJ/NOPB uses the 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring an exposed thermal pad for enhanced PCB heat dissipation. The package is RoHS-compliant and lead-free (NOPB suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Accepts 40–60 V DC; requires local 100 μF/75 V aluminum electrolytic bypass capacitor. |
| 2 - OUTPUT | Switch node / power output | Drives external catch diode and inductor; carries high di/dt switching current; must be routed with minimal loop area. |
| 3 - GND | Power and signal ground | Common return for input cap, output cap, and feedback network; connects to thermal pad for thermal conduction. |
| 4 - FEEDBACK (ADJ) | Regulation sense input | References 1.23 V internal bandgap; connects to resistor divider between VOUT and GND to set output voltage. |
| 5 - ON/OFF | Digital enable/disable control | TTL-compatible input; <2.4 V = ON, >2.2 V = OFF; draws only 50 μA in standby mode. |
Key Features
| Feature | Design Value |
|---|---|
| Wide-input HV operation | 60 V absolute maximum input enables single-stage conversion from 48 V industrial/telecom sources without pre-regulator. |
| Integrated protection | Thermal shutdown + peak current limiting prevent latch-up or destruction during sustained overloads or shorts. |
| Low-component-count design | Only four external components required (inductor, catch diode, input/output caps) - reduces BOM cost and layout complexity. |
| Standard inductor compatibility | Optimized for common off-the-shelf 330–470 μH shielded inductors rated ≥1.15 A DC, easing sourcing and qualification. |
| Stable fixed-frequency control | 52 kHz oscillator ensures predictable EMI profile and eliminates need for external timing components or compensation. |
| Adjustable output flexibility | 1.23 V reference supports output programming from 1.23 V to 37 V - accommodates diverse system rail requirements. |
Applications
| Industrial 24/48 V Power Conversion | Telecom Remote Power Feeds |
|---|---|
|
Use Scenario: Converting unregulated 48 V DC from central office power plant to 5 V or 12 V for remote line cards. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and thermally robust DC-DC conversion. Use Value: Eliminates need for bulky pre-regulators and heat sinks; maintains regulation across wide input transients (40–60 V). |
Use Scenario: Generating stable 3.3 V or 5 V rails on telecom line interface cards powered by -48 V or +48 V distribution buses. IC Role / Device Role / Timing Role: High-voltage step-down regulator with TTL shutdown for power sequencing and fault recovery. Use Value: 50 μA standby current enables low-power maintenance mode; ±4% output tolerance ensures reliable logic supply. |
| On-Board Industrial MCU Power | Positive-to-Negative Converter (Buck-Boost) |
|
Use Scenario: Providing clean 3.3 V for microcontrollers and sensors in factory automation PLC modules operating from 24 V DC field bus. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing inefficient linear regulators and discrete switchers. Use Value: TO-263 thermal performance (37°C/W) sustains 1A output at 70°C ambient without heatsink or airflow. |
Use Scenario: Generating -5 V or -12 V bias rails from positive 12 V or 24 V supplies in instrumentation amplifiers and analog front-ends. IC Role / Device Role / Timing Role: Buck converter reconfigured in inverting topology using external inductor and diode. Use Value: Leverages same 1.23 V reference and 52 kHz oscillator for predictable inverter design; supports bipolar rail generation. |
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-220-5 package; 40 V max input; θJA = 45°C/W (no PCB copper enhancement); lower HV capability. | Suitable for lower-input-voltage industrial designs (<40 V) where through-hole mounting or manual heatsinking is acceptable. | Select LM2575T-ADJ only if input stays ≤40 V and surface-mount thermal optimization is not required. |
| LM2596SX-ADJ/NOPB | Higher 63 V input rating; 150 kHz switching; improved efficiency (≥85%); requires different inductor value and layout. | Better suited for space-constrained designs needing higher frequency, lower ripple, or tighter load regulation. | Choose LM2596SX-ADJ/NOPB when upgrading for higher efficiency or smaller magnetics; verify layout changes for 150 kHz operation. |
Compared with LM2575T-ADJ, LM2575HVSX-ADJ/NOPB adds 20 V input headroom and superior thermal performance via TO-263; versus LM2596SX-ADJ/NOPB, it trades higher frequency for proven 52 kHz EMI behavior and simpler inductor selection.
Availability
LM2575HVSX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power conversion, telecom remote powering, and embedded MCU supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575HVSX-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 switching regulator design and manufacturing.
The LM2575HV product line was engineered specifically for high-input-voltage industrial and telecom applications where reliability, thermal robustness, and minimal external component count are critical design priorities.
FAQ
What is the maximum input voltage rating for LM2575HVSX-ADJ/NOPB?
The LM2575HVSX-ADJ/NOPB has a maximum continuous input voltage rating of 60 V, with absolute maximum rating of 63 V. This distinguishes it from standard LM2575 variants (40 V max) and makes it suitable for direct regulation from 48 V industrial or telecom bus systems. Operation above 60 V risks permanent damage even for brief transients.
How is output voltage set on LM2575HVSX-ADJ/NOPB?
Output voltage is set externally using two resistors (R1 and R2) forming a voltage divider from VOUT to GND, with the midpoint connected to the FEEDBACK (ADJ) pin. The internal 1.23 V reference forces current through R1, so VOUT = 1.23 × (1 + R2/R1). R1 is typically 1–5 kΩ; precision 1% metal film resistors are recommended for stability.
Does LM2575HVSX-ADJ/NOPB require a heat sink in typical operation?
No external heat sink is required for LM2575HVSX-ADJ/NOPB when used within its 1A output and thermal limits, provided the TO-263 package's exposed thermal pad is soldered to ≥1 in² of PCB copper. With that layout, θJA = 37°C/W enables full 1A operation at 70°C ambient without additional heatsinking.
What type of catch diode is recommended for LM2575HVSX-ADJ/NOPB?
A Schottky diode rated for ≥1.2× the maximum load current and ≥1.25× the maximum input voltage is required. For example, with 60 V input and 1 A load, a 40 V, 3 A Schottky such as MBR340 or 31DQ04 is appropriate. Fast-recovery diodes may be used but reduce efficiency due to higher forward voltage and reverse recovery losses.
Can LM2575HVSX-ADJ/NOPB be used in a negative-output (inverting) configuration?
Yes - LM2575HVSX-ADJ/NOPB can be configured as a buck-boost (inverting) regulator to generate negative output voltages. The standard application circuit (Figure 26) is reconfigured with inductor and diode relocated; output polarity reverses while maintaining the same 1.23 V feedback reference and 52 kHz switching behavior.
LM2575HVSX-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:
- 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/NOPB FAQ
1.How can I place an order for LM2575HVSX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVSX-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 LM2575HVSX-ADJ/NOPB reliable?
The price and inventory of LM2575HVSX-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 LM2575HVSX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575HVSX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVSX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVSX-ADJ/NOPB?
LM2575HVSX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVSX-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 LM2575HVSX-ADJ/NOPB?
For technical support, including LM2575HVSX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVSX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2575HVSX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575HVSX-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 LM2575HVSX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575HVSX-ADJ/NOPB?
All LM2575HVSX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVSX-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 LM2575HVSX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2575HVSX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575HVSX-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…
