My Inquiry
My Account
Texas Instruments LM2575S-5.0
- Part No.:
- LM2575S-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575S-5.0.pdf
- Description:
- IC REG BUCK 5V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,941
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575S-5.0 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 5.0V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 8V to 40V input and delivers stable 5V power for embedded control, industrial sensors, and point-of-load conversion.
For engineers reviewing the LM2575S-5.0 datasheet, LM2575S-5.0 pinout, LM2575S-5.0 application, or LM2575S-5.0 equivalent, this page provides verified technical context, package-specific pin functions, real-world efficiency data at 1A load, thermal resistance for TO-263 mounting, and two validated alternative parts with documented functional trade-offs.
Technical Context
The LM2575S-5.0 implements a fixed-frequency (52 kHz) pulse-width modulation (PWM) buck topology with internal NPN switch, feedback comparator, and oscillator. Its 1.23V reference feeds a resistive divider in adjustable versions, but is internally trimmed for 5.0V fixed output - eliminating external resistor selection.
It features TTL-compatible ON/OFF control (50 μA standby current), 0.9V typical saturation voltage at 1A, and built-in protection including thermal shutdown (150°C junction limit) and peak current limiting (1.7–3.0A range). The device requires only four external components: input capacitor, output capacitor, catch diode, and inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over 8–40V input, 0.2–1A load, −40°C to +125°C |
| Max Output Current | 1A continuous DC load capability with thermal derating above 25°C ambient |
| Switching Frequency | 52 kHz fixed internal oscillator - enables use of low-cost, high-saturation inductors |
| Efficiency | 77% typical at VIN = 12V, VOUT = 5V, IOUT = 1A - reduces heat sink requirements |
| Junction-to-Ambient θJA | 37°C/W for DDPAK/TO-263 package with ≥1 in² PCB copper - enables compact thermal layout |
| Standby Current | 50 μA typical when ON/OFF pin pulled high - supports low-power sleep modes |
| Saturation Voltage | 0.9V typical at 1A - limits conduction loss and improves light-load regulation |
Pinout & Package
LM2575S-5.0 uses the 5-lead surface-mount DDPAK/TO-263 package (package code KTT0005B), with exposed thermal pad electrically connected to Pin 2 (Output) for optimal heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Input | VIN supply connection | Accepts 8–40V DC; requires local 47–100 μF aluminum electrolytic bypass |
| Pin 2: Output | Regulated 5.0V switching node | Drives inductor and output capacitor; thermally tied to exposed pad |
| Pin 3: Ground | Power and signal reference | Must connect to low-impedance ground plane; shares return path with catch diode |
| Pin 4: Feedback | Internal voltage sense input | Internally connected to 5.0V divider - no external resistors required |
| Pin 5: ON/OFF | TTL-compatible enable control | Pull ≥2.2V to enable; ≤0.8V to enter 50 μA standby mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Activates at 150°C junction temperature - prevents permanent damage during overload or poor heatsinking |
| Cycle-by-cycle current limiting | Peak switch current limited to 1.7–3.0A - maintains stability under short-circuit or startup surge |
| Fixed 52 kHz oscillator | Enables predictable EMI filtering and eliminates need for external timing components |
| Low-quiescent 50 μA standby | Reduces system-level power consumption in battery-backed or energy-sensitive applications |
| Requires only 4 external parts | Input cap, output cap, Schottky catch diode, and inductor - minimizes BOM count and layout complexity |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and analog sensor circuitry from 12V vehicle battery with load dump immunity. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering regulated rail for digital logic and interface ICs. Use Value: 77% efficiency at 1A reduces thermal stress in sealed enclosures; 40V max input withstands ISO 7637-2 pulse 5a (load dump). |
Use Scenario: Generating stable 5V supply for door module MCU and LIN transceiver in space-constrained door panel. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter replacing linear regulator + heatsink. Use Value: TO-263 package with 37°C/W θJA allows direct PCB copper thermal sinking - eliminates discrete heatsink. |
| Medical Patient Monitor Front-End | Point-of-Load for FPGA Core Logic |
|
Use Scenario: Providing clean, isolated 5V rail for analog front-end ADCs and op-amps in portable diagnostic equipment. IC Role / Device Role / Timing Role: Intermediate pre-regulator feeding low-noise LDOs for sensitive analog subsystems. Use Value: Fixed 52 kHz frequency enables deterministic EMI filter design; ±4% output tolerance ensures ADC reference stability. |
Use Scenario: Local 5V generation for FPGA configuration and I/O banks on dense digital boards. IC Role / Device Role / Timing Role: High-current, board-mounted DC-DC converter minimizing voltage drop across long traces. Use Value: 1A output capacity supports multi-rail FPGA power sequencing; ON/OFF pin enables synchronized power-up/down. |
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-5.0 | Same electrical specs, but in through-hole TO-220 package (θJA = 45°C/W unheatsinked) | Preferred for prototyping, manual assembly, or legacy board designs requiring vertical mounting | Select when mechanical fit, hand-solderability, or thermal test flexibility outweighs surface-mount density benefits |
| MP1584EN-LF-Z | Higher 1.5A rating, 1.5 MHz switching, smaller solution size, but requires external compensation | Better suited for space-constrained, high-density designs where 52 kHz ripple is problematic | Choose when board area is critical and design team has experience tuning fast-switching buck loops |
Compared with LM2575T-5.0, LM2575S-5.0 offers lower thermal resistance (37 vs. 45°C/W) and automated assembly compatibility; versus MP1584EN-LF-Z, it trades higher integration and simpler layout for lower switching frequency and reduced EMI filter complexity.
Availability
LM2575S-5.0 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575S-5.0 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, high-efficiency replacement for linear regulators in cost-sensitive 1A buck applications - prioritizing simplicity, ruggedness, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2575S-5.0?
The LM2575S-5.0 has an absolute maximum input voltage of 45V and a recommended operating maximum of 40V. This rating applies across the full temperature range (−40°C to +125°C) and enables robust operation in 24V industrial systems and automotive environments with transient spikes. Exceeding 40V may trigger internal protection but is not guaranteed for continuous operation.
Does LM2575S-5.0 require external feedback resistors to set the 5V output?
No. The LM2575S-5.0 integrates the feedback divider for its fixed 5.0V output - Pin 4 (Feedback) is internally connected and must be left unconnected. External resistors are only required for the adjustable version (LM2575S-ADJ); adding them to LM2575S-5.0 will disrupt regulation and is not supported.
What catch diode is recommended for LM2575S-5.0 in a 1A application?
A Schottky diode rated for ≥1.2A average current and ≥50V reverse voltage is recommended - such as the SR103 (3A, 30V) or MBR130 (3A, 30V). These minimize forward voltage drop and switching losses. Fast-recovery diodes like UF4007 are acceptable but reduce efficiency by ~2–3% due to higher VF and reverse recovery charge.
How does thermal performance differ between LM2575S-5.0 and LM2575T-5.0?
The LM2575S-5.0 in TO-263 achieves 37°C/W θJA with 1 in² PCB copper, while the LM2575T-5.0 in TO-220 achieves 45°C/W without a heatsink. This 8°C/W improvement allows LM2575S-5.0 to sustain 1A continuously at up to 10°C higher ambient temperature - critical for sealed enclosures or stacked PCB assemblies.
Can LM2575S-5.0 be used in synchronous rectification configurations?
No. The LM2575S-5.0 uses an internal NPN transistor switch and requires an external catch diode - it does not support synchronous rectification. Its architecture lacks a second controlled switch or gate drive for a low-side MOSFET. For synchronous operation, consider TI's TPS5430 or MPQ4312 as alternatives.
LM2575S-5.0 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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)
LM2575S-5.0 FAQ
1.How can I place an order for LM2575S-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575S-5.0 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 LM2575S-5.0 reliable?
The price and inventory of LM2575S-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575S-5.0 is usually 5 days.
3.What payment methods are accepted for LM2575S-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575S-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575S-5.0?
LM2575S-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575S-5.0 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 LM2575S-5.0?
For technical support, including LM2575S-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575S-5.0 requirements.
6.How does Aetrix verify that LM2575S-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2575S-5.0 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 LM2575S-5.0 meets industry standards.
7.What is the process for return or replacement of LM2575S-5.0?
All LM2575S-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575S-5.0, 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 LM2575S-5.0 part is unused and in its original packaging.
Return procedure for LM2575S-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575S-5.0 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…
