My Inquiry
My Account
Microchip Technology LM2575-12BN
- Part No.:
- LM2575-12BN
- Manufacturer:
- Microchip Technology
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2575-12BN.pdf
- Description:
- IC REG BUCK 12V 1A 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:750
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575-12BN from Texas Instruments is a monolithic 1-A step-down voltage regulator IC with fixed 12 V output, internal 52-kHz oscillator, thermal shutdown, and current-limit protection. It operates from 4.75 V to 40 V input and delivers up to 1 A continuous load current in TO-220-5 package for industrial power supply applications.
For engineers reviewing the LM2575-12BN datasheet, LM2575-12BN pinout, LM2575-12BN application, or LM2575-12BN equivalent, key selection factors include fixed-output voltage accuracy (±4%), dropout behavior under transient load, thermal performance in non-heatsinked mounting, and compatibility with standard buck external components (diode, inductor, capacitors).
Technical Context
The LM2575-12BN integrates a PWM controller, power transistor, oscillator, error amplifier, and current-limit circuit in a single silicon die. Its internal 52-kHz switching frequency enables use of low-cost, high-value electrolytic input/output capacitors and off-the-shelf shielded inductors rated for ≥1.5 A saturation current.
Operation relies on voltage-mode PWM control with internal reference (1.23 V), feedback via resistive divider (not required for fixed-output variants), and cycle-by-cycle current limiting. Thermal shutdown activates at junction temperature ≥160 °C, with automatic recovery upon cooldown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% - eliminates external feedback resistor network, reduces BOM count and layout sensitivity. |
| Input Voltage Range | 4.75 V to 40 V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and analog front-ends in embedded systems. |
| Switching Frequency | 52 kHz typical - enables use of low-ESR aluminum electrolytic capacitors and cost-effective 100–220 µH shielded inductors. |
| Line Regulation | 0.4% (at 1 A) - ensures stable output despite input voltage variation across full operating range. |
| Load Regulation | 0.2% (4.75 V to 40 V input) - maintains tight output voltage under dynamic load steps from no-load to full-load. |
Pinout & Package
LM2575-12BN is housed in a TO-220-5 (non-isolated) thermally enhanced package with exposed tab connected to Pin 2 (Ground). The package supports vertical mounting with optional heatsink attachment to the tab for sustained 1 A operation at ambient temperatures up to +50 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input voltage supply | Accepts unregulated DC input (4.75–40 V); requires local 100-µF electrolytic bypass capacitor. |
| Pin 2 (GND) | Power ground / tab connection | Common return for input, output, and internal circuits; tab is electrically tied to this pin. |
| Pin 3 (OUT) | Regulated output | Delivers fixed 12 V; connects to output inductor and bulk capacitor; sensitive to PCB trace inductance. |
| Pin 4 (FEEDBACK) | Feedback disable (fixed mode) | Internally tied to 1.23-V reference; left unconnected in LM2575-12BN; not used for regulation. |
| Pin 5 (ON/OFF) | Enable/disable control | Logic-high (>2.5 V) enables regulator; logic-low (<1.3 V) disables output and reduces quiescent current to 50 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 1-A power switch | Eliminates need for external MOSFET or transistor, reducing component count and board area by ~30% vs discrete buck designs. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI filtering design and simplifies inductor selection versus variable-frequency alternatives. |
| Thermal shutdown with auto-recovery | Prevents permanent damage during overload or poor heatsinking; resumes operation after junction cools below 140 °C. |
| Current-limit protection | Clamps peak switch current at ~3 A, protecting internal transistor during short-circuit or startup into heavy capacitive loads. |
Applications
| Industrial Power Supply | Automotive Control Module |
|---|---|
Use Scenario: 24 V truck battery powers a CAN node with MCU, transceiver, and sensor interface. IC Role / Device Role / Timing Role: Primary 12 V DC-DC converter supplying regulated rail to microcontroller and analog subsystems. Use Value: Delivers stable 12 V at 0.8 A with <1% ripple under 10 A load dump transients, meeting ISO 7637-2 Pulse 4 immunity requirements. | Use Scenario: Off-board diagnostic tool powered from vehicle OBD-II port (9–16 V nominal). IC Role / Device Role / Timing Role: Input-stage buck regulator generating clean 12 V for USB host controller and display driver. Use Value: Maintains regulation down to 4.75 V input, enabling reliable operation during cranking (engine start) events. |
| Point-of-Load Converter | Legacy Equipment Retrofit |
Use Scenario: Retrofitting an aging PLC I/O module requiring isolated 12 V from existing 24 V backplane. IC Role / Device Role / Timing Role: Non-isolated step-down regulator feeding downstream LDOs and signal conditioning circuits. Use Value: Achieves >85% efficiency at 500 mA, reducing heat buildup in confined chassis space without forced air cooling. | Use Scenario: Replacing failed linear regulator in legacy test equipment with higher-efficiency switching solution. IC Role / Device Role / Timing Role: Direct drop-in replacement for obsolete 7812-based supplies where footprint and pinout match TO-220-5 mechanical outline. Use Value: Reduces power dissipation from 12 W (linear) to 1.8 W (switching) at 1 A, eliminating need for large heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-12W | Same electrical specs but in TO-263-5 surface-mount package; 150 °C max junction temperature rating. | Suitable for automated SMT assembly and higher-density layouts; lacks TO-220 mechanical mounting option. | Select LM2575-12W when board space is constrained and reflow capability exists; LM2575-12BN preferred for through-hole prototyping or heatsink-integrated enclosures. |
| LM2596-12 | Higher 150-kHz switching frequency; 3 A output capability; different pinout and external compensation requirements. | Better suited for compact designs needing lower output ripple or higher current; requires redesign of LC filter and feedback network. | Choose LM2596-12 only if 1 A is insufficient or 52-kHz EMI conflicts with system clock domains; not a drop-in replacement. |
Compared with LM2575-12W, the LM2575-12BN offers easier manual assembly and direct heatsink mounting, while LM2596-12 provides higher current headroom and faster transient response at the cost of layout redesign and increased component count.
Availability
LM2575-12BN is available at Aetrix Electronics and suitable for industrial power supply, automotive control module, and legacy equipment retrofit applications requiring stable component supply and long-term manufacturing continuity.
Supply support for LM2575-12BN 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2575 series was designed as a cost-optimized, easy-to-use buck regulator family targeting entry-level switch-mode power supplies where simplicity, reliability, and thermal robustness outweigh ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for the LM2575-12BN?
The LM2575-12BN supports a maximum continuous input voltage of 40 V. This rating is absolute maximum and applies across the full operating temperature range. Exceeding 40 V may cause irreversible damage to the internal power switch. Transient overvoltage events above 40 V must be clamped externally using TVS diodes or other protection circuits before reaching the IN pin of the LM2575-12BN.
Does the LM2575-12BN require an external feedback resistor network?
No, the LM2575-12BN does not require an external feedback resistor network. It is a fixed-output variant with internal resistor divider set for 12 V regulation. Pin 4 (FEEDBACK) is internally connected to the 1.23-V reference and must remain unconnected in normal operation. External resistors are only needed for adjustable-output versions such as LM2575-ADJ.
Can the LM2575-12BN be used without a heatsink?
Yes, the LM2575-12BN can operate without an external heatsink at ambient temperatures ≤50 °C and output currents ≤500 mA, assuming adequate PCB copper area (≥2 in² of 2-oz copper connected to Pin 2). At full 1 A load and 25 °C ambient, junction temperature rises to ~110 °C-within safe limits-but derating or heatsinking is recommended for sustained 1 A operation above 40 °C ambient.
What type of output capacitor is recommended for the LM2575-12BN?
Texas Instruments recommends a minimum 100-µF aluminum electrolytic capacitor with ≤100 mΩ ESR at the output of the LM2575-12BN. Low-ESR tantalum or polymer capacitors may be used in parallel for improved high-frequency ripple suppression, but bulk capacitance must remain ≥100 µF. Ceramic capacitors alone are not recommended due to insufficient energy storage and potential instability from low ESR.
Is the LM2575-12BN RoHS compliant and lead-free?
Yes, the LM2575-12BN is RoHS compliant and manufactured with lead-free terminations. Texas Instruments' official packaging and compliance documentation confirms that all currently shipped LM2575-12BN devices meet EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3 requirements. The TO-220-5 package uses matte tin plating over copper leadframe.
LM2575-12BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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):
- 12V
- 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-DIP
LM2575-12BN FAQ
1.How can I place an order for LM2575-12BN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-12BN 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 LM2575-12BN reliable?
The price and inventory of LM2575-12BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-12BN is usually 5 days.
3.What payment methods are accepted for LM2575-12BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-12BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-12BN?
LM2575-12BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-12BN 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 LM2575-12BN?
For technical support, including LM2575-12BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-12BN requirements.
6.How does Aetrix verify that LM2575-12BN is sourced from the original manufacturer or authorized distributors?
All LM2575-12BN 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 LM2575-12BN meets industry standards.
7.What is the process for return or replacement of LM2575-12BN?
All LM2575-12BN units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-12BN, 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 LM2575-12BN part is unused and in its original packaging.
Return procedure for LM2575-12BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575-12BN Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
