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Texas Instruments TL2575-33IKTTR
- Part No.:
- TL2575-33IKTTR
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
TL2575-33IKTTR.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:782
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Product details
Overview
TL2575-33IKTTR from Texas Instruments is a fixed-output 3.3-V, 1-A step-down (buck) switching voltage regulator in TO-263-5 package. It operates from 4.75 V to 40 V input, delivers ±5% output regulation over line/load/temperature, and integrates a 52-kHz oscillator, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control-used in industrial power supplies requiring compact, efficient DC-DC conversion.
For engineers reviewing the TL2575-33IKTTR datasheet, TL2575-33IKTTR pinout, TL2575-33IKTTR application, or TL2575-33IKTTR equivalent, key selection criteria include its 1-A integrated switch, 3.3-V fixed output with no external feedback resistors, 50-μA standby current under shutdown, and compatibility with standard off-the-shelf inductors for minimal BOM count.
Technical Context
The TL2575-33IKTTR implements a synchronous-buck topology with internal NPN power switch and fixed-frequency PWM control. Its error amplifier compares the internal 1.23-V reference against the output via direct FEEDBACK connection, enabling stable regulation without external compensation components.
It features cycle-by-cycle current limiting, thermal shutdown at 150°C junction temperature, and a dedicated ON/OFF pin that accepts TTL-level logic to disable switching and reduce quiescent current to 50 μA. The device requires only four external components (input/output capacitors, inductor, catch diode) for full operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.3 V ±5% over full operating range - eliminates need for external feedback resistors. |
| Output current | 1 A continuous - supports medium-power loads without external pass devices. |
| Input voltage range | 4.75 V to 40 V - compatible with 5-V, 12-V, 24-V, and 36-V industrial rails. |
| Oscillator frequency | 52 kHz typical - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering burden. |
| Standby current | 50 μA typical - enables low-power sleep modes in battery-backed or energy-sensitive systems. |
| Efficiency | Up to 88% at 12-V input / 1-A load - reduces thermal design overhead versus linear regulators. |
| Thermal shutdown | 150°C junction limit - protects IC during overload or poor heatsinking conditions. |
Pinout & Package
TL2575-33IKTTR is housed in a TO-263-5 (KTT) thermally enhanced surface-mount package measuring 10.16 mm × 8.93 mm, with exposed metal tab for PCB thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts unregulated DC input from 4.75 V to 40 V; requires local 100-μF electrolytic bypass capacitor. |
| OUTPUT (Pin 2) | Switched output | Drives external inductor and catch diode; connects to output filter capacitor and load. |
| GND (Pin 3) | Power ground | Common return path for input/output currents and internal circuitry; must be low-impedance. |
| FEEDBACK (Pin 4) | Regulation sense | Internally tied to 3.3-V output; no external resistor network required for fixed-voltage operation. |
| ON/OFF (Pin 5) | Shutdown control | TTL-compatible input: <1.6 V enables operation; >2.2 V disables switching and reduces IQ to 50 μA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1-A NPN switch | Eliminates external MOSFET and gate driver, reducing layout complexity and component count. |
| Fixed 3.3-V output | Removes feedback resistor selection, trimming, and placement sensitivity - improves production yield. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI spectrum and simplifies filter design versus variable-frequency alternatives. |
| TTL shutdown with 50-μA standby | Supports system-level power sequencing and low-power states without auxiliary circuitry. |
| Thermal shutdown + cycle-by-cycle current limit | Provides robust fault protection during short-circuit, overload, or thermal runaway events. |
Applications
| Industrial Motor Drives | Factory Automation Controllers |
|---|---|
|
Use Scenario: Powering microcontroller, I/O buffers, and sensor interfaces in servo drive modules operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying core logic and communication peripherals. Use Value: Delivers regulated 3.3 V at up to 1 A with 88% efficiency, minimizing heat generation in enclosed enclosures without heatsinks. |
Use Scenario: Generating clean 3.3-V rail for PLC CPU modules and fieldbus transceivers (e.g., RS-485, CAN) in harsh factory environments. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing isolated, stable supply independent of input rail fluctuations. Use Value: ±5% regulation across –40°C to +125°C ensures reliable operation during ambient temperature swings and load transients. |
| Grid Infrastructure Monitoring | Building Management Systems |
|
Use Scenario: Powering remote RTU sensors and wireless telemetry units deployed on 36-V DC distribution lines in substations. IC Role / Device Role / Timing Role: Input-tolerant buck regulator converting wide-range DC to precise 3.3-V logic supply. Use Value: 40-V max input rating and thermal shutdown protect against transient overvoltage events common in grid-edge applications. |
Use Scenario: Supplying HVAC controllers, occupancy sensors, and digital signage processors from 24-V PoE or building DC backbone. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator replacing inefficient linear solutions. Use Value: TO-263 package with exposed tab enables direct thermal coupling to copper pour, sustaining 1-A load at 75°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-3.3 | Same pinout, identical 3.3-V fixed output, but lower 40-V max input (vs. TL2575-33IKTTR's 40-V absolute max); no HV variant available. | Compatible in legacy designs using LM2575 footprint; lacks TL2575's tighter thermal specs and improved ESD ratings. | Select LM2575-3.3 only if footprint compatibility is mandatory and input never exceeds 36 V. |
| TPS54202DRT | 2-A synchronous buck, 4.5–28-V input, adjustable output; requires external feedback resistors and has different pinout. | Higher current and efficiency (95%), but demands more design effort for loop compensation and layout. | Choose TPS54202DRT when >1-A output or higher efficiency is required; not drop-in compatible. |
Compared with LM2575-3.3, TL2575-33IKTTR offers superior thermal performance (RθJA = 26.5°C/W vs. 35°C/W) and tighter output tolerance; versus TPS54202DRT, it trades current capability and efficiency for simplicity, cost, and minimal external component count.
Availability
TL2575-33IKTTR is available at Aetrix Electronics and suitable for industrial motor drives, factory automation controllers, and grid infrastructure monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TL2575-33IKTTR 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 high-reliability power conversion solutions.
The TL2575 family was designed as a robust, easy-to-use replacement for three-terminal linear regulators in medium-power industrial DC-DC applications, emphasizing integration, thermal resilience, and minimal external component requirements.
FAQ
What is the maximum input voltage rating for TL2575-33IKTTR?
The TL2575-33IKTTR has an absolute maximum input voltage of 42 V per datasheet Section 6.1, with recommended operating range up to 40 V. Exceeding 42 V risks permanent damage. For designs requiring >40 V input, the TL2575HV-33IKTTR variant supports up to 60 V input and shares identical 3.3-V output behavior.
Does TL2575-33IKTTR require external feedback resistors?
No. TL2575-33IKTTR is a fixed-output variant: its FEEDBACK pin is internally connected to the 3.3-V output, eliminating all external resistors. This differs from the adjustable TL2575-ADJ version, which requires two external resistors to set VOUT.
How does the ON/OFF pin function on TL2575-33IKTTR?
The ON/OFF pin (Pin 5) provides TTL-compatible shutdown control: grounding or applying <1.6 V enables normal operation; applying >2.2 V places TL2575-33IKTTR into standby mode with 50-μA quiescent current. Leaving the pin floating is unsafe and may cause erratic behavior.
What package type is used for TL2575-33IKTTR?
TL2575-33IKTTR uses the TO-263-5 (KTT) package - a thermally enhanced surface-mount variant with five leads and an exposed metal tab for direct PCB thermal conduction. Its body size is 10.16 mm × 8.93 mm, and it is not pin-compatible with PDIP or TO-220 versions of the TL2575 family.
Can TL2575-33IKTTR operate without a heatsink?
Yes - under typical conditions (e.g., 12-V input, 1-A load, 25°C ambient), TL2575-33IKTTR dissipates ~0.7 W and remains within safe junction temperature limits using only PCB copper as heatsink. At higher ambient temperatures or input voltages, thermal relief via copper pour under the exposed tab is strongly recommended.
TL2575-33IKTTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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)
TL2575-33IKTTR FAQ
1.How can I place an order for TL2575-33IKTTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL2575-33IKTTR 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 TL2575-33IKTTR reliable?
The price and inventory of TL2575-33IKTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL2575-33IKTTR is usually 5 days.
3.What payment methods are accepted for TL2575-33IKTTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL2575-33IKTTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL2575-33IKTTR?
TL2575-33IKTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL2575-33IKTTR 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 TL2575-33IKTTR?
For technical support, including TL2575-33IKTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL2575-33IKTTR requirements.
6.How does Aetrix verify that TL2575-33IKTTR is sourced from the original manufacturer or authorized distributors?
All TL2575-33IKTTR 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 TL2575-33IKTTR meets industry standards.
7.What is the process for return or replacement of TL2575-33IKTTR?
All TL2575-33IKTTR units undergo pre-shipment inspection (PSI). If there is an issue with TL2575-33IKTTR, 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 TL2575-33IKTTR part is unused and in its original packaging.
Return procedure for TL2575-33IKTTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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