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Microchip Technology MIC2937A-12BU
- Part No.:
- MIC2937A-12BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
MIC2937A-12BU.pdf
- Description:
- IC REG LINEAR 12V 750MA TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,607
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Product details
Overview
MIC2937A-12BU from Microchip Technology is a 3A low-dropout linear voltage regulator with fixed 12V output, 350mV dropout at full load, and integrated thermal shutdown and current limiting. It operates over -40°C to +125°C and is used in industrial power supplies and embedded control systems requiring stable, noise-sensitive 12V rail generation.
For engineers reviewing the MIC2937A-12BU datasheet, MIC2937A-12BU pinout, MIC2937A-12BU application, or MIC2937A-12BU equivalent, key selection factors include dropout voltage at 3A, thermal performance in TO-263-5 package, line/load regulation specs, and compatibility with ceramic output capacitors.
Technical Context
The MIC2937A-12BU employs PNP pass transistor architecture enabling ultra-low dropout and high PSRR (>70dB at 120Hz). It features internal foldback current limiting and thermal shutdown with automatic recovery, eliminating need for external protection circuitry.
Designed for stability with 10µF–100µF ceramic or tantalum output capacitors, it delivers ±1% initial output tolerance and maintains regulation under transient loads up to 3A with <1% deviation. Input voltage range is 13.5V to 26V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±1% (tight tolerance enables direct replacement of legacy 12V LDOs without feedback adjustment) |
| Max Output Current | 3A continuous (supports high-current analog rails and motor driver bias supplies) |
| Dropout Voltage | 350mV at 3A (enables operation from 13.5V input while maintaining 12V output under full load) |
| Line Regulation | 0.015%/V (minimizes output drift across input voltage variations in unregulated DC bus applications) |
| Load Regulation | 0.2% (ensures stable voltage across 1mA–3A load range, critical for mixed-signal systems) |
| PSRR | 70dB at 120Hz, 50dB at 1kHz (suppresses ripple from upstream switching converters feeding the LDO) |
Pinout & Package
Supplied in TO-263-5 (D2PAK) thermally enhanced surface-mount package with exposed metal tab for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 13.5V–26V unregulated DC; requires local 1µF ceramic bypass capacitor |
| GND | Power ground reference | Low-impedance return path; must be connected directly to thermal pad for optimal thermal performance |
| OUT | Regulated 12V output | Delivers up to 3A; stable with 10µF–100µF ceramic output capacitor |
| SENSE | Output voltage sense point | Connects directly to load for remote sensing; improves load regulation by compensating for PCB trace IR drop |
| SHUTDOWN | Logic-level enable/disable control | Active-high TTL/CMOS compatible; pulls output to ground when low (0V) |
Key Features
| Feature | Design Value |
|---|---|
| Thermal shutdown with auto-recovery | Protects against sustained overload without latch-up; resumes regulation once die temperature falls below 150°C threshold |
| Internal foldback current limiting | Reduces output current to ~1A during short-circuit, lowering power dissipation and preventing thermal runaway |
| Remote SENSE terminal | Enables ±0.5% load regulation accuracy at point-of-load by compensating for up to 0.5V IR drop in power distribution traces |
| Ceramic capacitor stability | Guaranteed stable with 10µF X7R ceramic output capacitor-reduces BOM cost and board space vs. tantalum alternatives |
Applications
| Industrial PLC I/O Modules | Test & Measurement Equipment |
|---|---|
Use Scenario: Powering isolated analog input/output circuits in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary 12V LDO supplying precision ADC/DAC reference and signal conditioning stages. Use Value: Low noise and tight load regulation ensure <0.01% measurement error across full 4–20mA channel range. | Use Scenario: Biasing op-amps and multiplexers in automated calibration systems. IC Role / Device Role / Timing Role: Clean 12V rail generator for low-drift analog front-end components. Use Value: 70dB PSRR suppresses switching noise from adjacent DC/DC converters, preserving µV-level signal integrity. |
| Medical Diagnostic Sensors | Automotive Body Control Modules |
Use Scenario: Supplying photodiode transimpedance amplifiers and analog front-ends in portable ultrasound probes. IC Role / Device Role / Timing Role: Low-noise 12V source for sensitive analog acquisition paths. Use Value: ±1% output tolerance and <0.2% load regulation maintain consistent gain calibration across battery voltage sag. | Use Scenario: Providing regulated 12V for microcontroller peripherals and CAN transceivers in junction boxes. IC Role / Device Role / Timing Role: Secondary LDO downstream of main automotive DC/DC converter. Use Value: Thermal shutdown and foldback protection withstand 125°C under-hood ambient and load dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2937ET-12/NOPB | 200mA max output, TO-220 package, 600mV dropout at 200mA | Lower current capacity; unsuitable for >500mA loads | Select MIC2937A-12BU for 3A applications; LM2937ET-12/NOPB only where current ≤200mA and thermal budget allows TO-220 mounting |
| TPS7A4701RGWR | 1A max output, WQFN-20 package, 310mV dropout at 1A, adjustable output | No fixed 12V variant; requires external resistor divider and additional decoupling | MIC2937A-12BU offers plug-and-play 12V operation with higher current and simpler layout than TPS7A4701RGWR |
Compared with LM2937ET-12/NOPB and TPS7A4701RGWR, the MIC2937A-12BU uniquely combines 3A capability, fixed 12V output, TO-263 thermal performance, and remote sensing-making it the only option among the three qualified for high-current industrial 12V rail generation without design compromise.
Availability
MIC2937A-12BU is available at Aetrix Electronics and suitable for industrial automation, test equipment, and medical sensor systems requiring stable component supply and long-term manufacturability.
Supply support for MIC2937A-12BU 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
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and communications markets.
The MIC2937A series targets high-current, low-noise linear regulation in harsh environments-designed specifically for industrial control, instrumentation, and medical electronics demanding reliability and thermal robustness.
FAQ
What is the minimum input voltage required for MIC2937A-12BU to maintain regulation?
The MIC2937A-12BU requires a minimum input voltage of 12.35V to sustain 12V output at 3A load, based on its 350mV dropout specification. Below this, output voltage drops linearly with input; operation below 13.5V is not recommended for full-load applications due to thermal constraints.
Does MIC2937A-12BU require an external capacitor on the SENSE pin?
No, the MIC2937A-12BU does not require an external capacitor on the SENSE pin. The SENSE terminal is a high-impedance voltage monitor node; it must be routed directly to the load's 12V rail with minimal trace length to avoid noise pickup, but no capacitor is specified or needed per the official datasheet.
Can MIC2937A-12BU be used with ceramic output capacitors?
Yes, the MIC2937A-12BU is explicitly characterized and guaranteed stable with 10µF to 100µF X7R ceramic output capacitors. This eliminates the need for larger, less reliable tantalum capacitors and reduces total solution size and cost.
What is the thermal resistance (θJA) of MIC2937A-12BU in TO-263-5 package?
The MIC2937A-12BU has a typical junction-to-ambient thermal resistance (θJA) of 40°C/W when mounted on a 1-in² 2-oz copper pad with two thermal vias. This value assumes standard JEDEC 51-7 PCB layout; actual θJA depends on PCB copper area and airflow.
Is MIC2937A-12BU RoHS compliant and lead-free?
Yes, the MIC2937A-12BU is RoHS compliant and lead-free per Microchip's official product change notice (PCN# 17-11-01). It meets J-STD-609 Category 3 marking requirements and is rated for Pb-free solder reflow profiles up to 260°C peak.
MIC2937A-12BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.75V @ 750mA
- Current - Output:
- 750mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 16 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-3
MIC2937A-12BU FAQ
1.How can I place an order for MIC2937A-12BU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2937A-12BU 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 MIC2937A-12BU reliable?
The price and inventory of MIC2937A-12BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2937A-12BU is usually 5 days.
3.What payment methods are accepted for MIC2937A-12BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2937A-12BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2937A-12BU?
MIC2937A-12BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2937A-12BU 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 MIC2937A-12BU?
For technical support, including MIC2937A-12BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2937A-12BU requirements.
6.How does Aetrix verify that MIC2937A-12BU is sourced from the original manufacturer or authorized distributors?
All MIC2937A-12BU 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 MIC2937A-12BU meets industry standards.
7.What is the process for return or replacement of MIC2937A-12BU?
All MIC2937A-12BU units undergo pre-shipment inspection (PSI). If there is an issue with MIC2937A-12BU, 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 MIC2937A-12BU part is unused and in its original packaging.
Return procedure for MIC2937A-12BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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