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Microchip Technology LM2575-3.3BWM
- Part No.:
- LM2575-3.3BWM
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575-3.3BWM.pdf
- Description:
- IC REG BUCK 3.3V 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,616
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Product details
Overview
LM2575-3.3BWM from Texas Instruments is a 1A step-down switching regulator IC with fixed 3.3V output, 40V input voltage rating, and internal 52kHz oscillator. It integrates a power transistor, thermal shutdown, and current-limit protection, and is used in industrial power supplies and embedded system DC-DC conversion.
For engineers reviewing the LM2575-3.3BWM datasheet, LM2575-3.3BWM pinout, LM2575-3.3BWM application, or LM2575-3.3BWM equivalent, key selection factors include output voltage accuracy (±4%), dropout behavior under load transients, thermal performance in TO-220-5 package, and compatibility with standard buck external components (diode, inductor, capacitors).
Technical Context
The LM2575-3.3BWM implements a fixed-frequency pulse-width modulation (PWM) control architecture with internal 52kHz oscillator and built-in NPN power switch rated for 1A continuous output current. Feedback is via internal resistor divider set to 3.3V nominal output.
It features cycle-by-cycle current limiting, thermal shutdown with hysteresis, and safe operation across input voltages from 4.75V to 40V. No external compensation network is required due to internal compensation design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% - eliminates need for external feedback resistors and simplifies layout |
| Max Input Voltage | 40V - supports wide-input industrial and automotive battery-fed applications |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and logic rails |
| Switching Frequency | 52kHz typical - enables use of low-cost, high-inductance toroidal inductors |
| Dropout Voltage | ~2.5V at 1A - requires minimum 5.8V input to sustain 3.3V output under full load |
| Thermal Shutdown | Activated at ~160°C junction temperature - protects device during overload or poor heatsinking |
Pinout & Package
LM2575-3.3BWM is housed in a TO-220-5 (Straight Lead) thermally enhanced package with exposed tab electrically connected to Pin 2 (Ground). The package supports direct heatsink mounting and provides adequate thermal dissipation for 1A operation at moderate ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input voltage supply | Accepts unregulated DC input (4.75–40V); requires local ceramic bypass capacitor |
| Pin 2 (GND) | Power and control ground | Common reference for internal circuitry and external components; tied to exposed tab |
| Pin 3 (OUT) | Switched output node | Drives external catch diode and output inductor; high dv/dt node requiring short trace routing |
| Pin 4 (FEEDBACK) | Internal feedback connection | Internally tied to 3.3V divider; not accessible - no external resistor network needed |
| Pin 5 (ON/OFF) | Enable/disable control | Logic-high (>2.5V) enables regulation; logic-low (<1.3V) disables output and reduces quiescent current to 50µA |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A NPN switch | Eliminates need for external power transistor and associated drive circuitry |
| Internal frequency compensation | Enables stable operation with minimal external components - no compensation capacitor required |
| 52kHz fixed switching frequency | Reduces EMI filtering complexity and allows use of cost-effective magnetic components |
| ON/OFF logic control | Supports system-level power sequencing and standby mode without external logic gate |
| Thermal shutdown with hysteresis | Prevents thermal runaway during sustained overload while allowing automatic recovery after cooldown |
Applications
| Industrial Power Supply | Embedded Microcontroller Board |
|---|---|
Use Scenario: Converting 12V or 24V rail to stable 3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator delivering regulated 3.3V to digital logic and analog front-end circuitry. Use Value: High input voltage tolerance (up to 40V) accommodates industrial transients; integrated protection avoids discrete overcurrent/thermal add-ons. | Use Scenario: Powering ARM Cortex-M or RISC-V MCU cores and peripherals on compact PCBs. IC Role / Device Role / Timing Role: Main 3.3V supply rail generator with enable control for sleep/wake sequencing. Use Value: Fixed-output configuration reduces BOM count; ON/OFF pin enables precise power-state management without extra ICs. |
| Point-of-Load Converter | Legacy System Retrofit |
Use Scenario: Local regulation near FPGA or DSP requiring clean 3.3V at up to 1A. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing linear regulators to improve efficiency. Use Value: 75% typical efficiency at 1A (vs. <30% for LDO) reduces board-level heat and extends thermal margin. | Use Scenario: Replacing obsolete 78L33 linear regulators in aging instrumentation designs. IC Role / Device Role / Timing Role: Drop-in-compatible switching upgrade offering higher current and better thermal performance. Use Value: Same TO-220-5 footprint and pinout as many legacy linear regulators - minimizes PCB rework. |
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-3.3 | TO-220-5 package, same electrical specs, but no ON/OFF pin (pin 5 is NC) | Lacks enable functionality; unsuitable for power-gated systems | Select LM2575-3.3BWM when system-level enable control is required |
| LM2596-3.3 | Higher 3A output current, 150kHz switching frequency, different pinout and external compensation | Requires redesign of inductor, diode, and feedback network; not pin-compatible | Choose LM2596-3.3 only when >1A output or higher efficiency at light loads is needed |
Compared with LM2575T-3.3, LM2575-3.3BWM adds ON/OFF control without changing footprint; compared with LM2596-3.3, it offers simpler design and lower EMI at the cost of reduced current capability and fixed compensation.
Availability
LM2575-3.3BWM is available at Aetrix Electronics and suitable for industrial automation, embedded control, and legacy system upgrades requiring stable component supply and long-term manufacturability.
Supply support for LM2575-3.3BWM 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 company focused on analog and embedded processing technologies, with leadership in power management ICs and industrial-grade components.
The LM2575 family was designed for cost-sensitive, medium-current DC-DC conversion in industrial, automotive, and consumer applications where simplicity, reliability, and thermal robustness are prioritized.
FAQ
What is the maximum input voltage rating for the LM2575-3.3BWM?
The LM2575-3.3BWM supports a maximum input voltage of 40V. This rating is absolute maximum and applies across the full operating temperature range. Operation above 40V risks permanent damage. For reliable long-term use, design margins should keep input below 36V in environments with line transients or ripple.
Does the LM2575-3.3BWM require external compensation components?
No, the LM2575-3.3BWM does not require external compensation components. Its internal compensation network is optimized for stability with standard external components (inductor, diode, input/output capacitors). Adding external compensation may degrade transient response or cause oscillation.
Can the LM2575-3.3BWM be used in place of a linear regulator like the 78L33?
Yes, the LM2575-3.3BWM can replace the 78L33 in many applications due to identical TO-220-5 footprint and pinout. However, it delivers up to 1A vs. 100mA for the 78L33, and requires an external inductor and diode. Efficiency improves significantly, especially at higher input voltages.
What is the function of Pin 5 (ON/OFF) on the LM2575-3.3BWM?
Pin 5 is the logic-controlled enable input for the LM2575-3.3BWM. Applying ≥2.5V enables regulation; ≤1.3V disables the internal switch and reduces quiescent current to 50µA. This feature supports power sequencing and low-power standby modes in systems using the LM2575-3.3BWM.
Is the LM2575-3.3BWM RoHS compliant and lead-free?
Yes, the LM2575-3.3BWM is RoHS compliant and manufactured with lead-free terminations per TI's official product change notices. The device meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for industrial temperature range (−40°C to +125°C junction).
LM2575-3.3BWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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):
- 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:
- 24-SOIC
LM2575-3.3BWM FAQ
1.How can I place an order for LM2575-3.3BWM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-3.3BWM 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 LM2575-3.3BWM reliable?
The price and inventory of LM2575-3.3BWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-3.3BWM is usually 5 days.
3.What payment methods are accepted for LM2575-3.3BWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-3.3BWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-3.3BWM?
LM2575-3.3BWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-3.3BWM 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 LM2575-3.3BWM?
For technical support, including LM2575-3.3BWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-3.3BWM requirements.
6.How does Aetrix verify that LM2575-3.3BWM is sourced from the original manufacturer or authorized distributors?
All LM2575-3.3BWM 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 LM2575-3.3BWM meets industry standards.
7.What is the process for return or replacement of LM2575-3.3BWM?
All LM2575-3.3BWM units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-3.3BWM, 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 LM2575-3.3BWM part is unused and in its original packaging.
Return procedure for LM2575-3.3BWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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