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Texas Instruments TL2575-ADJIN
- Part No.:
- TL2575-ADJIN
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
TL2575-ADJIN.pdf
- Description:
- IC REG BUCK ADJ 1A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,149
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Product details
Overview
TL2575-ADJIN from Texas Instruments is a 1-A adjustable-output step-down (buck) switching voltage regulator IC with internal 1-A N-channel MOSFET switch, 1.23-V reference, and fixed 52-kHz oscillator. It operates from 4.75 V to 40 V input, delivers output from 1.23 V to 37 V, and achieves up to 88% efficiency in buck configurations for industrial power rails.
For engineers reviewing the TL2575-ADJIN datasheet, TL2575-ADJIN pinout, TL2575-ADJIN application, or TL2575-ADJIN equivalent, this page provides verified electrical specs, TO-220 package terminal mapping, thermal shutdown behavior, cycle-by-cycle current limiting, and real-world design guidance for adjustable DC-DC conversion in embedded systems.
Technical Context
The TL2575-ADJIN integrates a fixed-frequency PWM controller, error amplifier with 1.23-V bandgap reference, thermal shutdown circuitry, and cycle-by-cycle peak-current limiting. Its feedback loop uses external resistive dividers to set output voltage, with typical feedback bias current of 50–100 nA and ±4% regulation over line, load, and temperature.
It employs internal frequency compensation and requires only four external components (input/output capacitors, inductor, catch diode) for operation. Standby mode draws 50 μA typical quiescent current when ON/OFF pin is high, and the device enters thermal shutdown above 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports medium-power loads without external pass transistor |
| Input Voltage Range | 4.75 V to 40 V - compatible with 5 V, 12 V, 24 V, and 36 V industrial bus rails |
| Adjustable Output Range | 1.23 V to 37 V - set via external R1/R2 divider; 1.23-V reference enables precise low-voltage regulation |
| Oscillator Frequency | 52 kHz (typical) - fixed internal clock simplifies EMI filtering and inductor selection |
| Efficiency | Up to 88% (typical) - reduces thermal load vs. linear regulators; eliminates heatsink in many cases |
| Standby Current | 50 μA (typical) - enables low-power shutdown via TTL-compatible ON/OFF pin |
| Protection Features | Thermal shutdown + cycle-by-cycle current limiting - prevents damage during overload or short-circuit |
Pinout & Package
TL2575-ADJIN is supplied in the KV (TO-220, staggered leads) 5-pin package with exposed tab for thermal conduction. 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 supply | Accepts 4.75–40 V; must be bypassed with ≥47 µF electrolytic capacitor near pin |
| OUTPUT (Pin 2) | Switched output node | Drives external inductor; connects to cathode of catch diode and output capacitor anode |
| GND (Pin 3) | Power and signal ground reference | Common return for input cap, output cap, feedback divider, and ON/OFF logic |
| FEEDBACK (Pin 4) | Regulation sense input | Connects to voltage divider midpoint; 1.23-V reference sets VOUT = 1.23 × (1 + R2/R1) |
| ON/OFF (Pin 5) | TTL-compatible enable/disable control | Low ≤1.0 V enables operation; high ≥2.2 V places device in 50-μA standby mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1-A N-channel switch | Eliminates need for external MOSFET; reduces BOM count and layout complexity |
| Fixed 52-kHz oscillator | Enables predictable EMI profile and consistent inductor sizing across designs |
| Internal frequency compensation | Permits stable operation with standard aluminum electrolytic output capacitors (no external compensation required) |
| ±4% output regulation | Guaranteed accuracy over full line (4.75–40 V), load (0–1 A), and temperature (–40°C to +125°C) range |
| Cycle-by-cycle current limiting | Prevents inductor saturation and MOSFET failure during transient overloads without latch-off |
Applications
| Industrial Motor Drive Power | Factory Automation I/O Module |
|---|---|
|
Use Scenario: Supplies regulated 5 V or 12 V to microcontroller, isolation drivers, and analog sensors in PLC backplane modules. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V DC bus to isolated logic/IO rail. Use Value: Delivers 1 A at 88% efficiency, reducing board-level heat generation and enabling compact enclosure design. |
Use Scenario: Powers fieldbus interface circuits (RS-485, CAN transceivers) in distributed I/O nodes operating from 12–36 V unregulated supply. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter configured for 3.3 V or 5 V with tight load regulation. Use Value: Maintains ±4% output stability across wide input range and temperature, ensuring reliable communication layer operation. |
| Grid Infrastructure Monitoring Unit | Building Management System Controller |
|
Use Scenario: Generates stable 5 V rail for ARM-based telemetry processors in outdoor smart metering gateways. IC Role / Device Role / Timing Role: Main power stage in non-isolated buck topology with thermal shutdown protection. Use Value: Withstands 40 V max input and –40°C to +125°C junction temp, meeting extended outdoor environmental requirements. |
Use Scenario: Provides 12 V auxiliary power to HVAC actuator drivers and sensor signal conditioning circuits in centralized controllers. IC Role / Device Role / Timing Role: High-current buck regulator supporting dynamic load steps from solenoid activation. Use Value: Cycle-by-cycle current limiting prevents fault propagation during motor stall events without system reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-ADJ | Same pinout and functional architecture; lower max input voltage (40 V vs. TL2575-ADJIN's 40 V), identical 1.23-V reference and 52-kHz oscillator | No HV variant; not rated for >40 V input - unsuitable where transient spikes exceed 40 V | Valid drop-in replacement if input stays ≤40 V and thermal derating aligns with TO-220 package |
| TPS54202D | 2-A synchronous buck with 4.5–28 V input, 500-kHz switching, integrated high/low-side FETs, and enable pin | Higher frequency enables smaller magnetics; lacks built-in thermal shutdown flag; no direct ON/OFF pin compatibility | Preferred for space-constrained designs needing >1 A or higher efficiency at light loads; requires PCB redesign |
Compared with LM2575-ADJ, TL2575-ADJIN offers identical adjustability and ruggedness but shares TI's updated thermal characterization and production test flow; versus TPS54202D, it trades higher current and integration for proven reliability in legacy industrial systems with minimal external component count.
Availability
TL2575-ADJIN is available at Aetrix Electronics and suitable for industrial motor drives, factory automation I/O modules, grid infrastructure monitoring units, and building management system controllers requiring stable component supply and long-term lifecycle support.
Supply support for TL2575-ADJIN 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 experience in industrial-grade power conversion solutions.
The TL2575 family was designed specifically for cost-sensitive, high-reliability industrial buck applications where simplicity, thermal robustness, and minimal external components are critical - targeting replacement of linear regulators in 1-A power rails.
FAQ
What is the maximum input voltage rating for TL2575-ADJIN?
The TL2575-ADJIN has an absolute maximum input voltage of 42 V and a recommended operating maximum of 40 V. Exceeding 40 V risks permanent damage even if within the 42-V absolute limit. For designs requiring >40 V input, the TL2575HV-ADJ variant (60 V max) should be used instead of TL2575-ADJIN.
How is the output voltage set on TL2575-ADJIN?
The TL2575-ADJIN output voltage is set using two external resistors (R1 and R2) connected between OUTPUT, FEEDBACK, and GND. The formula is VOUT = 1.23 V × (1 + R2/R1). R1 is typically 1 kΩ; R2 values for common outputs are documented in the datasheet (e.g., 3.1 kΩ for 5 V). TL2575-ADJIN requires no internal trimming - regulation relies solely on resistor ratio and the 1.23-V reference.
Does TL2575-ADJIN require an external catch diode?
Yes, TL2575-ADJIN requires an external Schottky catch diode (e.g., 1N5819 or equivalent) connected from OUTPUT to GND. This diode provides the freewheeling path for inductor current during the switch off-time. Using a fast-recovery or standard rectifier diode increases losses and may cause instability; Schottky diodes are mandatory for optimal efficiency and noise performance per the TL2575-ADJIN datasheet.
What thermal protection does TL2575-ADJIN include?
TL2575-ADJIN incorporates thermal shutdown that disables the internal switch when junction temperature exceeds approximately 150°C. Operation resumes automatically once temperature falls below the hysteresis threshold (~135°C). This protection is independent of current limiting and ensures safe operation under sustained overload or poor heatsinking conditions - a key reliability feature confirmed in the TL2575-ADJIN datasheet's absolute maximum ratings and functional description.
Can TL2575-ADJIN be used in inverting buck-boost topology?
Yes, TL2575-ADJIN supports inverting buck-boost configuration per the official TI application notes and functional block diagram. In this mode, the OUTPUT pin becomes the negative output rail, GND serves as the switching node, and the inductor connects between VIN and OUTPUT. The TL2575-ADJIN datasheet explicitly lists "inverting buck-boost power supplies" in its Applications section and provides layout guidance for this topology.
TL2575-ADJIN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- 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:
- 16-PDIP
TL2575-ADJIN FAQ
1.How can I place an order for TL2575-ADJIN through Aetrix?
Please submit a Request for Quotation (RFQ) for TL2575-ADJIN 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-ADJIN reliable?
The price and inventory of TL2575-ADJIN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL2575-ADJIN is usually 5 days.
3.What payment methods are accepted for TL2575-ADJIN?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL2575-ADJIN?
TL2575-ADJIN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL2575-ADJIN 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-ADJIN?
For technical support, including TL2575-ADJIN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL2575-ADJIN requirements.
6.How does Aetrix verify that TL2575-ADJIN is sourced from the original manufacturer or authorized distributors?
All TL2575-ADJIN 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-ADJIN meets industry standards.
7.What is the process for return or replacement of TL2575-ADJIN?
All TL2575-ADJIN units undergo pre-shipment inspection (PSI). If there is an issue with TL2575-ADJIN, 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-ADJIN part is unused and in its original packaging.
Return procedure for TL2575-ADJIN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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