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Texas Instruments TL2575-33IN
- Part No.:
- TL2575-33IN
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
TL2575-33IN.pdf
- Description:
- IC REG BUCK 3.3V 1A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,661
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Product details
Overview
TL2575-33IN from Texas Instruments is a fixed-output 3.3-V, 1-A step-down (buck) switching voltage regulator in TO-220 package, featuring ±5% output regulation over line, load, and temperature, 4.75–40 V input range, and 52-kHz internal oscillator. It delivers high-efficiency power conversion for industrial control and embedded systems requiring compact, thermally robust DC/DC solutions.
For engineers reviewing the TL2575-33IN datasheet, TL2575-33IN pinout, TL2575-33IN application, or TL2575-33IN equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the TL2575-33IN variant in TO-220 (KV) package.
Technical Context
The TL2575-33IN integrates a 1-A N-channel MOSFET switch, fixed-frequency 52-kHz PWM controller, internal 1.23-V bandgap reference, and cycle-by-cycle current limiting. Its error amplifier compares feedback voltage against reference to regulate output via duty-cycle adjustment.
It operates in continuous conduction mode under full load and transitions to discontinuous mode below ~200 mA. Thermal shutdown activates at 150°C junction temperature, and TTL-compatible ON/OFF pin enables low-standby-current (50 μA typical) shutdown without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.3 V ±5% over –40°C to 125°C, 4.75–40 V input, 0.2–1 A load - ensures stable logic rail generation without external feedback resistors. |
| Max output current | 1 A continuous - supports single-rail microcontroller, FPGA I/O, or sensor interface power without derating at 25°C ambient. |
| Input voltage range | 4.75 V to 40 V - accommodates 5 V, 12 V, 24 V, and 36 V industrial bus inputs with margin for transients. |
| Switching frequency | 52 kHz typical (42–63 kHz over temp) - enables use of low-cost, standard 330 µH inductors and reduces EMI filtering complexity vs. MHz-range regulators. |
| Efficiency | 75% typical at 12 VIN/3.3 VOUT/1 A - minimizes thermal dissipation versus linear regulators, eliminating heatsink in many 1-A applications. |
| Standby current | 50 µA typical at OFF state - enables battery-backed or energy-sensitive systems to achieve ultra-low quiescent power during sleep. |
| Junction temp range | –40°C to 125°C - qualified for industrial automation, motor drives, and grid infrastructure environments without derating. |
Pinout & Package
TL2575-33IN is supplied in TO-220 (KV) 5-pin staggered-lead package (10.16 mm × 8.82 mm), with exposed tab electrically connected to GND for thermal and EMI performance. Pin 1 = VIN, Pin 2 = OUTPUT, Pin 3 = GND, Pin 4 = FEEDBACK, Pin 5 = ON/OFF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated DC input | Accepts 4.75–40 V; requires ≥100 µF input capacitor placed adjacent to pin for stability and ripple suppression. |
| OUTPUT (Pin 2) | Regulated 3.3-V output | Delivers up to 1 A; connects to output inductor and catch diode anode; layout must minimize trace inductance. |
| GND (Pin 3) | Power ground | Common return for input cap, output cap, and thermal pad; must be low-impedance plane to avoid noise coupling. |
| FEEDBACK (Pin 4) | Output voltage sensing | Internally tied to 3.3 V output in fixed version; open-circuit or misconnection causes regulation failure. |
| ON/OFF (Pin 5) | TTL shutdown control | Logic-low (<1 V) enables operation; logic-high (>2.2 V) disables switching and reduces IQ to 50 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1-A power switch | Eliminates external MOSFET and gate driver, reducing BOM count and PCB area in buck converters. |
| Fixed 3.3-V output | Removes need for external resistor divider, simplifying layout and improving accuracy vs. adjustable variants. |
| Thermal shutdown + cycle-by-cycle current limit | Protects device and system during overload, short-circuit, or high-temp conditions without external protection ICs. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI spectrum and consistent inductor sizing across production units. |
| TTL-compatible ON/OFF pin | Allows direct interfacing with microcontrollers or logic gates for power sequencing and standby control. |
Applications
| Industrial Motor Drives | Factory Automation Controllers |
|---|---|
Use Scenario: Powering gate drivers and isolated I/O modules in servo amplifier PCBs operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying logic-level interface circuitry and microcontroller peripherals. Use Value: Delivers regulated 3.3 V at 1 A with 75% efficiency and thermal shutdown-reducing heat sink requirements and improving reliability in enclosed drive enclosures. |
Use Scenario: Generating 3.3-V supply for PLC backplane communication ICs and fieldbus transceivers. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter providing clean, stable rail for RS-485 PHYs and ARM-based control processors. Use Value: ±5% regulation over –40°C to 125°C ensures signal integrity across wide ambient ranges; TO-220 package enables mechanical mounting to metal chassis for enhanced thermal management. |
| Grid Infrastructure Monitoring | Building Management Systems |
Use Scenario: Powering wireless sensor nodes and metering ICs in outdoor smart-grid RTUs exposed to 36 V nominal DC input. IC Role / Device Role / Timing Role: Step-down regulator converting unregulated solar-charged battery or PoE-derived 36–40 V to 3.3 V for MCU and RF subsystems. Use Value: 40 V max input rating and 50 µA standby current enable long battery life in sleep mode while maintaining fast wake-up response. |
Use Scenario: Supplying HVAC controllers and digital thermostat modules powered from 24 VAC-to-DC adapters. IC Role / Device Role / Timing Role: Compact, thermally robust 3.3-V source for low-power microcontrollers and environmental sensors. Use Value: TO-220 package allows direct heatsinking to enclosure; 1-A capability supports future firmware upgrades adding display or BLE connectivity without redesign. |
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 3.3-V fixed output, 1-A rating, and 52-kHz frequency; but only rated to 40 VIN, no HV option, and higher 10 mA quiescent current. | Lacks TL2575-33IN's 50 µA standby mode; less suitable for battery-backed or low-power sleep applications. | Choose LM2575-3.3 only if legacy compatibility or cost sensitivity outweighs standby current and thermal performance needs. |
| TPS5430DDAR | 3-V to 36-V input, 3-A output, 500-kHz switching; requires external compensation and more external components. | Higher current and frequency suit space-constrained, high-density designs-but increases EMI filtering complexity and layout sensitivity. | Select TPS5430DDAR when >1 A output or smaller solution size justifies added design effort and component count. |
Compared with LM2575-3.3, TL2575-33IN offers 200× lower standby current and superior thermal metrics; versus TPS5430DDAR, it trades higher current and frequency for simpler implementation, fewer passives, and proven ruggedness in industrial environments.
Availability
TL2575-33IN is available at Aetrix Electronics and suitable for industrial motor drives, factory automation controllers, grid infrastructure monitoring, and building management systems requiring stable component supply, long-lifecycle assurance, and TO-220 thermal performance.
Supply support for TL2575-33IN 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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management ICs.
The TL2575 family was designed as a drop-in replacement for linear regulators in industrial and embedded buck applications-emphasizing simplicity (4 external parts), ruggedness (thermal/current protection), and wide-input operation without complex compensation.
FAQ
What is the maximum input voltage rating for TL2575-33IN?
The TL2575-33IN has a maximum input voltage rating of 40 V, as specified in its Absolute Maximum Ratings table. This allows safe operation from common industrial rails including 24 V and 36 V systems with transient margin. Exceeding 40 V risks permanent damage, even briefly. The TL2575HV-33IN variant supports up to 60 V, but TL2575-33IN itself is strictly limited to 40 V.
Does TL2575-33IN require external feedback resistors?
No, TL2575-33IN does not require external feedback resistors. As a fixed-output variant, its internal feedback network is trimmed to deliver 3.3 V. Pin 4 (FEEDBACK) is internally connected to the OUTPUT pin; externally connecting it elsewhere will disrupt regulation. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like TL2575-ADJ.
What package type is used for TL2575-33IN?
TL2575-33IN is packaged in TO-220 (KV) with 5 staggered leads and an exposed thermal tab electrically connected to GND. Its body size is 10.16 mm × 8.82 mm. This package provides robust thermal performance (RθJA = 26.5°C/W) and mechanical mounting capability-distinct from the PDIP-16 or TO-263-5 variants offered in the same family.
How does the ON/OFF pin function on TL2575-33IN?
The ON/OFF pin (Pin 5) of TL2575-33IN enables TTL-compatible shutdown: grounding or applying <1 V places the device in active regulation; applying >2.2 V disables switching and reduces quiescent current to 50 µA typical. Leaving the pin floating is unsafe-TI recommends pulling it to GND via ≤10 kΩ resistor if unused. This pin supports precise power sequencing in multi-rail systems.
What is the typical efficiency of TL2575-33IN at full load?
TL2575-33IN achieves 75% typical efficiency at 12 V input, 3.3 V output, and 1 A load, per the Electrical Characteristics table. Efficiency rises with higher input-to-output voltage ratios-for example, 88% is typical for 12 VIN/12 VOUT operation-but remains 75% under the 3.3-V fixed-output condition cited. This significantly outperforms linear regulators, which would dissipate ~8.7 W as heat at this condition.
TL2575-33IN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
TL2575-33IN FAQ
1.How can I place an order for TL2575-33IN through Aetrix?
Please submit a Request for Quotation (RFQ) for TL2575-33IN 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 TL2575-33IN reliable?
The price and inventory of TL2575-33IN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL2575-33IN is usually 5 days.
3.What payment methods are accepted for TL2575-33IN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL2575-33IN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL2575-33IN?
TL2575-33IN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL2575-33IN 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 TL2575-33IN?
For technical support, including TL2575-33IN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL2575-33IN requirements.
6.How does Aetrix verify that TL2575-33IN is sourced from the original manufacturer or authorized distributors?
All TL2575-33IN 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 TL2575-33IN meets industry standards.
7.What is the process for return or replacement of TL2575-33IN?
All TL2575-33IN units undergo pre-shipment inspection (PSI). If there is an issue with TL2575-33IN, 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 TL2575-33IN part is unused and in its original packaging.
Return procedure for TL2575-33IN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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