My Inquiry
My Account
Texas Instruments LM2575T-ADJ
- Part No.:
- LM2575T-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2575T-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:186
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575T-ADJ from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-220 package, delivering adjustable output from 1.23V to 37V with ±4% output voltage tolerance, 52 kHz fixed-frequency operation, and integrated thermal shutdown/current limiting. It replaces linear regulators in mid-power DC/DC conversion for industrial power supplies and embedded systems.
For engineers reviewing the LM2575T-ADJ datasheet, LM2575T-ADJ pinout, LM2575T-ADJ application, or LM2575T-ADJ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for volume procurement and BOM continuity.
Technical Context
The LM2575T-ADJ implements a fixed-frequency (52 kHz) current-mode buck topology with internal NPN switch, feedback comparator, oscillator, and protection circuitry. Its adjustable output is set via external resistor divider connected to the Feedback (FB) pin, referencing a precise 1.23V internal bandgap.
It operates across 4.75V–40V input range, delivers up to 1A continuous output current, and features TTL-compatible ON/OFF control with 50 μA standby current. Cycle-by-cycle current limiting and thermal shutdown ensure robust fault handling without external sensing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports single-rail loads like microcontrollers, sensors, or analog circuitry without external pass devices. |
| Input Voltage Range | 4.75V to 40V - compatible with 5V, 12V, 24V, and 36V industrial bus rails; excludes HV variant. |
| Output Voltage Range | 1.23V to 37V - set externally via R1/R2 divider; 1.23V reference enables low-voltage logic rails and high-voltage bias supplies. |
| Feedback Reference Voltage | 1.23V ±4% - defines output accuracy baseline; actual VOUT = 1.23V × (1 + R2/R1), with worst-case error bounded by reference tolerance. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., PE-52627) and reduces EMI filtering complexity. |
| Efficiency at 1A | 77% @ VIN=12V, VOUT=5V - significantly reduces thermal load vs. linear regulators; eliminates need for heatsink below ~0.5A in typical layouts. |
| Thermal Resistance (θJA) | 65°C/W (TO-220, no heatsink) - limits max ambient temperature to ~75°C at full 1A load with minimal copper; improves to 45°C/W with 4 in² PCB copper. |
Pinout & Package
LM2575T-ADJ uses a 5-lead TO-220 package (Package Number NDH0005D) with exposed tab electrically connected to Pin 2 (Output). Mounting requires isolation if output is not ground-referenced.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input | Unregulated DC input supply | Accepts 4.75V–40V; requires local 100 μF/75V electrolytic capacitor; high di/dt node demanding short, low-inductance layout. |
| 2: Output | Regulated switched output | Drives inductor and output capacitor; internally connected to exposed tab; must be isolated from heatsink unless output is ground-referenced. |
| 3: Ground | Power and signal reference | Common return for input cap, output cap, feedback divider, and ON/OFF control; requires star grounding near IC for noise immunity. |
| 4: Feedback | Voltage sense input | High-impedance node (50 nA bias) monitoring resistor divider; sensitive to noise-must be routed short and away from switching nodes. |
| 5: ON/OFF | Digital enable/disable control | TTL-compatible input; <1.0V disables (50 μA standby), >2.2V enables; open-circuit defaults to ON; no pull-up required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated switch and controller | Eliminates external MOSFET and gate driver; simplifies design to only 4 external components (inductor, diode, input/output caps). |
| Fixed 52 kHz oscillator | Enables predictable EMI profile and compatibility with standard inductor families optimized for that frequency. |
| TTL shutdown with 50 μA standby | Allows low-power system sleep modes; enables battery-backed applications where quiescent draw must stay below 100 μA. |
| Cycle-by-cycle current limit | Protects against short-circuit and overload without external sensing; peak switch current limited to 1.7–3.0 A depending on temp. |
| Thermal shutdown | Automatically disables output above 150°C junction temperature; recovers after cooldown-no latch required. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
|
Use Scenario: Converting 24V factory bus to 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, efficient, and thermally manageable intermediate rail. Use Value: Replaces linear regulators to avoid >15W heat dissipation at 1A; enables compact enclosure design without forced air. |
Use Scenario: Generating 3.3V from 12V for ARM Cortex-M microcontrollers and peripherals in edge gateways. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-dropout linear regulators for ultra-low-noise analog sections. Use Value: Delivers 77% efficiency at 1A, reducing upstream supply loading and enabling smaller front-end transformers or PoE injectors. |
| On-Card DC/DC Conversion | Positive-to-Negative Converter |
|
Use Scenario: Local 12V generation on a motor control board from 48V main rail for gate drivers and logic. IC Role / Device Role / Timing Role: Self-contained buck stage with minimal external parts, mounted directly adjacent to load. Use Value: Requires only inductor, Schottky diode, and two electrolytics-reduces BOM count and layout area vs. controller+MOSFET solutions. |
Use Scenario: Deriving –5V rail from +12V for op-amp biasing or RS-232 transceivers in instrumentation. IC Role / Device Role / Timing Role: Configured as inverting buck-boost using standard external components per Figure 26. Use Value: Leverages same inductor and diode as buck mode; avoids dedicated inverting ICs or transformer-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVT-ADJ | Wider 4.75V–60V input range; higher 63V absolute max input; identical pinout and FB reference. | Suitable for 48V telecom or automotive battery-supplied systems where input transients exceed 40V. | Select when VIN may exceed 40V; otherwise LM2575T-ADJ offers lower cost and same performance at ≤40V. |
| LM2596T-ADJ | Higher 3A output current; 150 kHz switching frequency; improved 0.5% FB reference accuracy; different pinout (no ON/OFF pin). | Better suited for higher-current or tighter-accuracy applications; requires redesign of feedback network and layout due to frequency change. | Choose for >1A loads or <1% output tolerance needs; avoid if ON/OFF control or legacy LM2575 footprint is required. |
Compared with LM2575HVT-ADJ, the LM2575T-ADJ trades input voltage headroom for cost and thermal simplicity; compared with LM2596T-ADJ, it retains TTL shutdown and proven 52 kHz magnetics compatibility at lower current and relaxed accuracy.
Availability
LM2575T-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, on-card DC/DC conversion, and positive-to-negative converter designs requiring stable component supply and long-term BOM continuity.
Supply support for LM2575T-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 ICs, with decades of expertise in switching regulator design and manufacturing reliability.
The LM2575 series was engineered as a drop-in replacement for linear regulators in medium-power applications, targeting cost-sensitive industrial, automotive, and consumer systems needing simple, robust, and thermally efficient DC/DC conversion.
FAQ
What is the maximum input voltage rating for LM2575T-ADJ?
The LM2575T-ADJ has an absolute maximum input voltage of 45V and a recommended operating maximum of 40V. Exceeding 40V risks violating the specified operating conditions and may trigger thermal shutdown or reduce long-term reliability. The LM2575HVT-ADJ variant supports up to 60V input for higher-voltage applications.
How is the output voltage set on LM2575T-ADJ?
The LM2575T-ADJ output voltage is set using a two-resistor divider between output and ground, with the midpoint connected to the Feedback (Pin 4) pin. The internal 1.23V reference determines VOUT = 1.23V × (1 + R2/R1). R1 is typically 1k–5kΩ; common values include R1 = 2.0kΩ and R2 = 6.12kΩ for 5V output.
Does LM2575T-ADJ require an external diode, and what type is recommended?
Yes, LM2575T-ADJ requires an external catch diode. A Schottky diode rated for ≥1.2× output current and ≥1.25× maximum input voltage is recommended-e.g., MBR340 (40V, 3A) for 1A designs. Fast recovery diodes like 1N5822 are acceptable but less efficient than Schottky due to higher forward voltage.
Can LM2575T-ADJ be used in a buck-boost (inverting) configuration?
Yes, LM2575T-ADJ can be configured as a positive-to-negative buck-boost converter per TI's Application Note and Figure 26 in the datasheet. It uses the same inductor and diode as the buck configuration but rearranges connections to generate a negative output referenced to input ground.
What thermal considerations apply to LM2575T-ADJ in TO-220 package?
LM2575T-ADJ in TO-220 has θJA = 65°C/W with minimal PCB copper and 45°C/W with 4 in² copper area. At 1A and 12V→5V conversion, power dissipation is ~1.5W; junction temperature rise is ~98°C above ambient with no heatsink-requiring derating or heatsinking above 50°C ambient. Mounting the tab to a heatsink or large copper pour is strongly advised.
LM2575T-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- 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):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 1A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2575T-ADJ FAQ
1.How can I place an order for LM2575T-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-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 LM2575T-ADJ reliable?
The price and inventory of LM2575T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-ADJ is usually 5 days.
3.What payment methods are accepted for LM2575T-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-ADJ?
LM2575T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-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 LM2575T-ADJ?
For technical support, including LM2575T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-ADJ requirements.
6.How does Aetrix verify that LM2575T-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2575T-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 LM2575T-ADJ meets industry standards.
7.What is the process for return or replacement of LM2575T-ADJ?
All LM2575T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-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 LM2575T-ADJ part is unused and in its original packaging.
Return procedure for LM2575T-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575T-ADJ 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…
