My Inquiry
My Account
Texas Instruments LM2575T-12/LB03
- Part No.:
- LM2575T-12/LB03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2575T-12/LB03.pdf
- Description:
- IC REG BUCK 12V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575T-12/LB03 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in a 5-lead TO-220 package, delivering a fixed 12V output with ±4% tolerance across 15–40V input and 0.2–1A load. It integrates oscillator, PWM controller, and 65V-rated power switch, enabling high-efficiency DC/DC conversion for industrial power rails and embedded subsystems.
For engineers reviewing the LM2575T-12/LB03 datasheet, LM2575T-12/LB03 pinout, LM2575T-12/LB03 application, or LM2575T-12/LB03 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and two rigorously cross-referenced alternative parts for design continuity.
Technical Context
The LM2575T-12/LB03 implements a fixed-frequency (52 kHz) current-mode buck topology with internal cycle-by-cycle current limiting and thermal shutdown. Its feedback loop uses a precision 1.23V reference to regulate output via external resistor divider-though not required for fixed-output variants like this one.
It operates over −40°C to +125°C junction temperature, supports TTL-compatible shutdown (ISTBY = 50 μA typ), and delivers up to 88% efficiency at VIN = 15V, IOUT = 1A. The integrated power switch exhibits VSAT ≤ 1.4V at 1A, enabling low dropout operation without external MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% over 0.2–1A load and 15–40V input - ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Input Voltage | 40V - supports wide-range industrial inputs including 24V nominal systems with transients. |
| Output Current | 1A continuous - drives logic banks, sensors, and peripheral ICs without external boost stages. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation inductors (e.g., 330 µH) and reduces EMI filtering burden. |
| Efficiency | 88% at VIN = 15V, IOUT = 1A - cuts heat generation by >50% vs. linear regulators, eliminating need for heatsinks in many applications. |
| Thermal Resistance | θJA = 65°C/W (no heatsink), 45°C/W (4 in² copper) - defines PCB copper area requirements for thermal compliance. |
| Shutdown Current | 50 µA typical - enables low-power standby modes in battery-backed or energy-conscious systems. |
Pinout & Package
LM2575T-12/LB03 is housed in a 5-lead TO-220 package (Package Number NDH0005D) with bent, staggered leads and exposed tab for thermal conduction. Pin 3 (Tab) is electrically connected to Pin 2 (Output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | VIN supply input | Accepts 15–40V DC; requires ≥100 µF input capacitor close to pin for stability and transient suppression. |
| 2 (Output) | Regulated 12V output | Drives load directly; connects to inductor and catch diode anode; electrically tied to tab (Pin 3). |
| 3 (Tab) | Thermal pad / Output connection | Must be soldered to ≥4 in² copper pour for θJA = 45°C/W; not isolated - shares node with Pin 2. |
| 4 (Ground) | Power and signal ground reference | Single-point grounding required; ties internal oscillator, feedback comparator, and control logic to return path. |
| 5 (ON/OFF) | TTL-compatible enable/disable control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables output and reduces quiescent current to 50 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power switch | 65V-rated N-channel MOSFET with 1.4V saturation voltage at 1A - eliminates external switch and gate driver complexity. |
| Fixed-frequency oscillator | 52 kHz internal clock - simplifies EMI filter design and enables predictable inductor sizing using TI's published selection guides. |
| Current-limit protection | Peak current limit of 1.7–3.2A - prevents damage during short-circuit or overload while maintaining regulation under partial faults. |
| Thermal shutdown | Activates at TJ ≥ 150°C - protects die integrity during sustained overload or inadequate heatsinking without latch-up. |
| External component count | Only 4 external parts required (inductor, diode, input/output capacitors) - accelerates layout and reduces BOM cost vs. controller-based solutions. |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
|
Use Scenario: Converting 24V factory bus to clean 12V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 12V rail with line/load regulation < ±1.5%. Use Value: Eliminates need for bulky linear regulators and associated heatsinks, reducing board area by >60% and improving system MTBF. |
Use Scenario: On-board DC/DC conversion for FPGA or MCU subsystems requiring stable 12V from a 36V backplane. IC Role / Device Role / Timing Role: Fixed-output switching regulator with TTL shutdown for power sequencing and sleep mode control. Use Value: Enables rapid power-state transitions with 50 µA standby current, extending battery life in portable test equipment. |
| Automotive Aftermarket Module | Test Equipment Power Stage |
|
Use Scenario: Powering CAN transceivers and microcontrollers in vehicle diagnostic tools operating from 12V/24V battery inputs. IC Role / Device Role / Timing Role: Input-transient-tolerant buck regulator with 40V max rating and built-in thermal/current protection. Use Value: Survives load-dump events up to 40V without external clamping, reducing protection component count and failure points. |
Use Scenario: Generating calibrated 12V supply for DUT power in automated test fixtures with programmable ON/OFF control. IC Role / Device Role / Timing Role: Enable-controlled voltage source synchronized to test sequence via TTL-level signal on Pin 5. Use Value: Allows precise power-up/power-down timing and fault isolation during functional testing without relay drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVT-12/LB03 | 60V max input (vs. 40V), same pinout and 12V output - higher voltage rating enables 48V system compatibility. | Required where input may exceed 40V (e.g., telecom -48V systems or automotive cold-crank scenarios). | Select when VIN can reach 60V; otherwise LM2575T-12/LB03 offers lower cost and identical performance at ≤40V. |
| LM2596T-12 | Higher efficiency (≥92%), 150 kHz switching, adjustable version available - but requires different inductor and layout due to frequency shift. | Better suited for space-constrained designs needing higher efficiency or variable output tuning. | Choose LM2596T-12 only if efficiency >90% or 150 kHz operation is mandatory; LM2575T-12/LB03 remains optimal for legacy 52 kHz designs and proven reliability. |
Compared with LM2575HVT-12/LB03 and LM2596T-12, the LM2575T-12/LB03 delivers best-in-class thermal robustness at 40V input with minimal external components, making it ideal for cost-sensitive, thermally demanding industrial applications where 52 kHz EMI profile is acceptable.
Availability
LM2575T-12/LB03 is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rail generation, automotive aftermarket modules, and test equipment power stages requiring stable component supply and long-term manufacturability.
Supply support for LM2575T-12/LB03 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, high-volume power IC design.
The LM2575 series was engineered as a drop-in replacement for linear regulators in medium-power DC/DC applications, targeting industrial, automotive, and consumer systems needing simple, rugged, and efficient buck conversion.
FAQ
What is the maximum input voltage rating for LM2575T-12/LB03?
The LM2575T-12/LB03 has an absolute maximum input voltage of 45V, but its specified operating range is 15V to 40V. Operation above 40V risks violating guaranteed performance limits and may trigger internal protection circuits. For 48V or higher inputs, TI recommends the LM2575HVT-12/LB03 variant instead.
Does LM2575T-12/LB03 require an external feedback resistor network?
No. The LM2575T-12/LB03 is a fixed-output variant with internal feedback divider set for 12V regulation. Unlike the adjustable LM2575-ADJ, it does not require external R1/R2 resistors - only the four standard external components: input capacitor, output capacitor, inductor, and catch diode.
What thermal management is required for LM2575T-12/LB03 at full 1A load?
At 1A and 15V input, LM2575T-12/LB03 dissipates ~3W. With θJA = 65°C/W (no heatsink), junction temperature rise would exceed safe limits. TI specifies θJA = 45°C/W with 4 in² copper area - requiring direct soldering of the exposed tab (Pin 3) to a large PCB copper pour to maintain TJ ≤ 125°C.
Can LM2575T-12/LB03 be used in synchronous rectification configurations?
No. The LM2575T-12/LB03 integrates only a single N-channel power switch and requires an external Schottky or fast-recovery diode for the catch path. It does not support synchronous rectification - unlike later-generation controllers such as the LM2596 or TPS5430, which provide complementary gate drive outputs.
Is LM2575T-12/LB03 RoHS compliant and lead-free?
Yes. LM2575T-12/LB03 is manufactured in TI's RoHS-compliant, lead-free TO-220 package (NDH0005D) and meets JEDEC J-STD-020 moisture sensitivity level 3. Full compliance documentation, including material declarations and test reports, is available through TI's product folder and Aetrix Electronics' quality portal.
LM2575T-12/LB03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- 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-12/LB03 FAQ
1.How can I place an order for LM2575T-12/LB03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-12/LB03 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-12/LB03 reliable?
The price and inventory of LM2575T-12/LB03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-12/LB03 is usually 5 days.
3.What payment methods are accepted for LM2575T-12/LB03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-12/LB03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-12/LB03?
LM2575T-12/LB03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-12/LB03 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-12/LB03?
For technical support, including LM2575T-12/LB03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-12/LB03 requirements.
6.How does Aetrix verify that LM2575T-12/LB03 is sourced from the original manufacturer or authorized distributors?
All LM2575T-12/LB03 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-12/LB03 meets industry standards.
7.What is the process for return or replacement of LM2575T-12/LB03?
All LM2575T-12/LB03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-12/LB03, 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-12/LB03 part is unused and in its original packaging.
Return procedure for LM2575T-12/LB03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575T-12/LB03 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…
