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Texas Instruments LM2575T-3.3/NOPB
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- Part No.:
- LM2575T-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2575T-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:392
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Product details
Overview
LM2575T-3.3/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-220 package, delivering a fixed 3.3V output with ±4% tolerance across 4.75–40V input and 0.2–1A load. It integrates PWM controller, power switch, and protection circuitry, and is used in embedded power supplies where thermal efficiency and minimal external components are critical.
For engineers reviewing the LM2575T-3.3/NOPB datasheet, LM2575T-3.3/NOPB pinout, LM2575T-3.3/NOPB application, or LM2575T-3.3/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply support for industrial and OEM deployment.
Technical Context
The LM2575T-3.3/NOPB implements a fixed-frequency (52 kHz) current-mode buck topology with internal oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control. Its output stage uses an integrated NPN transistor with 0.9V saturation voltage at 1A.
It operates over −40°C to +125°C junction temperature, supports up to 40V input, and achieves 75% efficiency at 12VIN/1AOUT. The device requires only four external components: input capacitor, output capacitor, catch diode, and inductor - all standard off-the-shelf parts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over 4.75–40V input and 0.2–1A load - ensures stable logic rail generation without feedback resistor network. |
| Max Output Current | 1A continuous - supports single-rail microcontroller, FPGA I/O, or sensor subsystems without external current boosting. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, high-saturation-current inductors (e.g., 100–330 µH) and avoids EMI-sensitive bands. |
| Efficiency | 75% at 12VIN/3.3VOUT/1A - reduces heat sink requirements versus linear regulators; no heatsink needed below ~0.5A in TO-220. |
| Quiescent Current | 5 mA operating / 50 µA standby - enables low-power modes in battery-backed or always-on systems via TTL shutdown pin. |
| Thermal Resistance | θJA = 65°C/W (no heatsink), 45°C/W (4 in² copper) - defines PCB copper area needed to maintain <125°C junction under full load. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents latch-up during overload or short-circuit without external sensing. |
Pinout & Package
LM2575T-3.3/NOPB is housed in a 5-lead TO-220 package (Package Number NDH0005D) with tab connected to Pin 2 (Output). Leads are straight, through-hole mounted; tab serves as thermal and electrical connection to output node.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC input supply | Accepts 4.75–40V; requires local 100 µF/75V aluminum electrolytic bypass capacitor. |
| 2 - Output | Regulated 3.3V switching node | Drives inductor and output capacitor; tab is electrically and thermally tied to this pin. |
| 3 - Ground | Power and signal reference | Must be low-inductance single-point ground; connects to input cap negative and output cap negative. |
| 4 - Feedback | Internal voltage sense reference | Internally connected to 3.3V output - not accessible; fixed-output version has no external feedback 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 NPN power switch | Eliminates need for external MOSFET or driver; 0.9V VCE(sat) at 1A reduces conduction loss and simplifies layout. |
| Fixed 52 kHz oscillator | Enables predictable EMI filtering and eliminates timing component selection error in production designs. |
| Only 4 external components required | Reduces BOM count, assembly cost, and board space vs. controller-based buck solutions - ideal for cost-sensitive industrial modules. |
| TTL shutdown with 50 µA standby | Supports system-level power sequencing and sleep modes without auxiliary LDO or discrete logic. |
| Thermal + current protection | Self-protecting under fault conditions - no external circuitry needed for overtemperature or short-circuit recovery. |
Applications
| Industrial PLC I/O Power | Embedded Microcontroller Core Supply |
|---|---|
|
Use Scenario: Providing clean 3.3V rail to ARM Cortex-M4-based motion controller in factory automation cabinet with 24V DC bus input. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V to 3.3V; handles transient loads from motor gate drivers and ADC sampling bursts. Use Value: Delivers 1A peak current with 75% efficiency and built-in thermal shutdown - avoids thermal runaway during extended servo activation. |
Use Scenario: Powering a wireless sensor node MCU (e.g., MSP432) from a 12V battery pack with periodic deep-sleep cycles. IC Role / Device Role / Timing Role: Main system regulator with TTL-controlled shutdown; synchronizes with MCU's low-power mode transitions. Use Value: 50 µA standby current extends battery life; fixed 3.3V output eliminates resistor divider drift concerns in long-life deployments. |
| On-Card Buck Pre-Regulator | Positive-to-Negative Converter (Buck-Boost) |
|
Use Scenario: Generating intermediate 5V rail from 24V input to feed downstream linear regulators (e.g., LP2951) for analog sensor conditioning. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing heat dissipation in multi-rail power architecture. Use Value: 75% efficiency at 1A cuts pre-regulator power loss by >60% vs. linear solution - lowers board temperature rise in sealed enclosures. |
Use Scenario: Deriving −3.3V rail for op-amp biasing in precision instrumentation using LM2575T-3.3/NOPB in inverting buck-boost configuration. IC Role / Device Role / Timing Role: Reconfigured as inverting regulator; leverages same 52 kHz frequency and internal switch for polarity inversion. Use Value: Uses identical component set (inductor, diode, caps) as standard buck - enables dual-rail generation without adding second IC. |
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-3.3/NOPB | Wider 4.75–60V input range; otherwise identical pinout, specs, and package. | Suitable for 48V industrial or automotive-derived inputs where transient spikes exceed 40V. | Select when input may reach 48–60V; same PCB layout but higher voltage rating on input capacitor required. |
| MP1584EN-LF-Z | 3A output, 1.5 MHz switching, SOIC-8 package; no integrated catch diode - requires external Schottky. | Better suited for compact, high-density layouts needing higher current or lower output ripple. | Choose for space-constrained designs requiring >1A or faster transient response; requires redesign of inductor and diode placement. |
Compared with LM2575HVT-3.3/NOPB, the LM2575T-3.3/NOPB offers lower cost and proven reliability in 40V-input systems; versus MP1584EN-LF-Z, it trades higher current and frequency for simpler BOM, lower EMI, and TO-220 thermal robustness in industrial environments.
Availability
LM2575T-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, embedded microcontroller power supplies, on-card buck pre-regulators, and positive-to-negative converter designs requiring stable component supply and long-term manufacturability.
Supply support for LM2575T-3.3/NOPB 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, production-ready power ICs.
The LM2575 series was designed as a drop-in, high-efficiency replacement for 78xx linear regulators in industrial, telecom, and embedded systems - prioritizing simplicity, thermal resilience, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2575T-3.3/NOPB?
The LM2575T-3.3/NOPB supports a maximum input voltage of 40V under normal operating conditions. Absolute maximum rating is 45V, but sustained operation above 40V risks exceeding safe operating area limits and triggering thermal shutdown. For 48V bus applications, TI recommends LM2575HVT-3.3/NOPB instead, rated for 60V input.
Does LM2575T-3.3/NOPB require an external feedback resistor network?
No, the LM2575T-3.3/NOPB is a fixed-output variant - its feedback node (Pin 4) is internally connected to the 3.3V output. Unlike the adjustable LM2575-ADJ, it needs no external resistors, eliminating drift, tolerance, and layout sensitivity associated with feedback dividers.
Can LM2575T-3.3/NOPB be used in a negative-output (inverting) configuration?
Yes, LM2575T-3.3/NOPB can be configured as a positive-to-negative buck-boost converter per TI Application Note SLVA001. The same 52 kHz switching frequency, internal switch, and protection features apply - only the external inductor, diode, and capacitor connections differ from the standard buck layout.
What is the thermal performance of LM2575T-3.3/NOPB in TO-220 without a heatsink?
In a standard TO-220 mount with minimal copper (½-inch leads, socket or small PCB pad), LM2575T-3.3/NOPB has θJA = 65°C/W. At 1A output and 12V input, power dissipation is ~8.7W - resulting in ~565°C rise above ambient, which exceeds 125°C junction limit. A heatsink or ≥4 in² copper pour (θJA = 45°C/W) is required for full-load operation.
Is LM2575T-3.3/NOPB RoHS compliant and lead-free?
Yes, the /NOPB suffix explicitly denotes "No Lead (Pb)-Free" - LM2575T-3.3/NOPB is RoHS-compliant, with lead-free terminations and compatible with standard Pb-free reflow profiles. It meets TI's green packaging standards and carries full material declarations per REACH and conflict minerals reporting requirements.
LM2575T-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- 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):
- 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:
- TO-220-5
LM2575T-3.3/NOPB FAQ
1.How can I place an order for LM2575T-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-3.3/NOPB 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-3.3/NOPB reliable?
The price and inventory of LM2575T-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575T-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-3.3/NOPB?
LM2575T-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-3.3/NOPB 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-3.3/NOPB?
For technical support, including LM2575T-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-3.3/NOPB requirements.
6.How does Aetrix verify that LM2575T-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575T-3.3/NOPB 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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575T-3.3/NOPB?
All LM2575T-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-3.3/NOPB, 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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2575T-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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