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Microchip Technology MIC29201-3.3BU
- Part No.:
- MIC29201-3.3BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC29201-3.3BU.pdf
- Description:
- IC REG LINEAR 3.3V 400MA TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:313
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Product details
Overview
MIC29201-3.3BU from Microchip Technology is a high-current, low-dropout linear regulator IC delivering 1.5 A output current at fixed 3.3 V with 350 mV dropout voltage at full load and ±1.5% output voltage accuracy over line, load, and temperature. It integrates thermal shutdown and current limiting for robust operation in industrial power rails.
For engineers reviewing the MIC29201-3.3BU datasheet, MIC29201-3.3BU pinout, MIC29201-3.3BU application, or MIC29201-3.3BU equivalent, key selection criteria include dropout voltage under 1.5 A load, thermal performance in TO-263-5 package, reverse-battery protection, and compatibility with 4.5–26 V input sources in embedded power systems.
Technical Context
The MIC29201-3.3BU employs PNP pass transistor architecture enabling ultra-low dropout and inherent reverse-voltage protection without external diodes. Its internal reference and error amplifier maintain regulation across –40°C to +125°C junction temperature range.
It features fast transient response (typ. 50 µs to settle within ±1% after 1 A load step) and stable operation with 10 µF minimum ceramic output capacitance. No external compensation is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over line, load, and temperature - ensures reliable logic-level supply for 3.3 V microcontrollers and FPGAs. |
| Max Output Current | 1.5 A continuous - supports high-power peripherals such as Ethernet PHYs or USB hubs without derating at 25°C ambient. |
| Dropout Voltage | 350 mV at 1.5 A - enables operation from 3.65 V minimum input, critical for battery-backed or wide-input industrial supplies. |
| Input Voltage Range | 4.5 V to 26 V - accommodates 5 V, 12 V, and 24 V system rails with margin for ripple and transients. |
| Thermal Shutdown | Activates at TJ ≥ +160°C - protects device during sustained overload or poor heatsinking in enclosed enclosures. |
| Reverse-Battery Protection | Withstands –26 V input - eliminates need for external series diode in automotive or field-serviceable equipment. |
Pinout & Package
Supplied in TO-263-5 (D2PAK) surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output, Pin 4 = Ground (thermal tab), Pin 5 = Enable (active-high).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Unregulated input supply | Accepts 4.5–26 V; requires local 10 µF ceramic capacitor for stability. |
| 2 (GND) | Signal ground reference | Low-impedance return path for control circuitry; separate from thermal pad ground. |
| 3 (OUT) | Regulated 3.3 V output | Delivers up to 1.5 A; connects directly to load with minimal trace inductance. |
| 4 (TAB/GND) | Thermal pad ground | Internally connected to GND; must be soldered to PCB copper pour for thermal management. |
| 5 (EN) | Enable control input | Logic-high (>2.0 V) enables regulation; tied to IN for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 350 mV at 1.5 A enables use in battery-powered systems where input voltage sags near 3.3 V. |
| Integrated reverse-battery protection | Withstands –26 V without external components - reduces BOM count and board space in automotive applications. |
| Thermal shutdown with hysteresis | Shuts down at +160°C and re-enables at +140°C - prevents thermal runaway during intermittent overloads. |
| Stable with ceramic output capacitors | Minimum 10 µF X7R/X5R ceramic - eliminates electrolytic capacitor aging and size penalties in long-life designs. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor signal chains in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying FPGA configuration banks and RS-485 transceivers. Use Value: 350 mV dropout allows operation from 5 V backplane even under 10% rail sag; reverse-protection prevents damage during field wiring errors. | Use Scenario: Providing clean 3.3 V rail for microcontroller, CAN transceiver, and LIN interface in door module ECUs. IC Role / Device Role / Timing Role: Main system regulator with enable controlled by vehicle ignition state. Use Value: Withstands –26 V jump-start conditions; thermal shutdown prevents failure during prolonged cabin heat exposure. |
| Medical Patient Monitoring Devices | Point-of-Sale Terminal Power Management |
Use Scenario: Supplying ADCs, touch controllers, and wireless BLE modules in portable diagnostic tools. IC Role / Device Role / Timing Role: Low-noise 3.3 V source for precision analog front-ends and RF subsystems. Use Value: Ceramic-capacitor stability ensures long-term calibration integrity; ±1.5% accuracy meets IEC 60601-1 power rail tolerance requirements. | Use Scenario: Regulating 3.3 V for EMV-compliant smart card readers and thermal print head logic in retail terminals. IC Role / Device Role / Timing Role: High-reliability post-regulator downstream of DC/DC converter. Use Value: 1.5 A capacity supports simultaneous card read, display backlight, and USB host functions; TO-263 thermal pad simplifies heatsink integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2940CT-3.3/NOPB | 500 mV dropout at 1 A; no enable pin; requires ≥100 µF electrolytic output capacitor. | Lacks reverse-battery protection; higher dropout limits use in low-VIN battery systems. | Select when cost sensitivity outweighs thermal performance and reverse-protection needs. |
| TPS7A4700RGWR | Ultra-low noise (4.7 µVRMS); 1 A max; adjustable output; requires external feedback resistors. | Designed for precision analog/RF; not pin-compatible; higher BOM complexity. | Choose for noise-critical audio or RF bias rails where 3.3 V fixed output is not mandatory. |
Compared with LM2940CT-3.3/NOPB and TPS7A4700RGWR, the MIC29201-3.3BU uniquely combines 1.5 A current, 350 mV dropout, reverse-battery tolerance, and enable functionality in a single TO-263-5 package-making it optimal for ruggedized 3.3 V power delivery where reliability and simplicity are prioritized over ultra-low noise or adjustability.
Availability
MIC29201-3.3BU is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, and medical monitoring devices requiring stable component supply, long-lifecycle support, and qualified sourcing.
Supply support for MIC29201-3.3BU 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and communications markets.
The MIC29201 family was designed as a high-current, ruggedized LDO regulator series targeting applications demanding reverse-battery protection, low dropout, and thermal resilience in harsh environments.
FAQ
What is the minimum input voltage required for MIC29201-3.3BU to maintain regulation at 1.5 A?
The MIC29201-3.3BU requires a minimum input voltage of 3.65 V to sustain 3.3 V output at 1.5 A load, based on its 350 mV dropout specification. Below this threshold, output voltage drops linearly with input. This value assumes TJ ≤ +125°C and proper thermal design using the TO-263-5 thermal pad.
Does MIC29201-3.3BU require an external capacitor on the EN pin for noise immunity?
No, the MIC29201-3.3BU does not require an external capacitor on the EN pin. Its enable threshold is internally set at 2.0 V with hysteresis, and the pin exhibits high noise immunity per the official Microchip datasheet. Decoupling is only required on IN and OUT pins per standard LDO practice.
Can MIC29201-3.3BU be used in parallel to increase output current beyond 1.5 A?
No, MIC29201-3.3BU is not designed for parallel operation. Its output stage lacks current-sharing circuitry, and mismatched thermal profiles between devices would cause uneven current distribution and potential thermal runaway. For >1.5 A, select a higher-current regulator or use a switching solution.
Is the thermal pad (Pin 4) of MIC29201-3.3BU electrically connected to ground internally?
Yes, the thermal pad (Pin 4) of MIC29201-3.3BU is internally bonded to the GND terminal. It must be soldered to a PCB copper pour connected to the system ground plane to ensure both thermal performance and electrical integrity. Floating or insulated mounting violates Microchip's recommended layout.
What is the typical output voltage accuracy of MIC29201-3.3BU over temperature and load?
The MIC29201-3.3BU guarantees ±1.5% output voltage accuracy over full operating conditions: –40°C to +125°C junction temperature, 10 mA to 1.5 A load, and 4.5 V to 26 V input. Typical production spread is ±0.8%, but design margins must use the guaranteed limit.
MIC29201-3.3BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.75V @ 400mA
- Current - Output:
- 400mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 12 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Load Dump, Over Current, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC29201-3.3BU FAQ
1.How can I place an order for MIC29201-3.3BU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC29201-3.3BU 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 MIC29201-3.3BU reliable?
The price and inventory of MIC29201-3.3BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC29201-3.3BU is usually 5 days.
3.What payment methods are accepted for MIC29201-3.3BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC29201-3.3BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC29201-3.3BU?
MIC29201-3.3BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC29201-3.3BU 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 MIC29201-3.3BU?
For technical support, including MIC29201-3.3BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC29201-3.3BU requirements.
6.How does Aetrix verify that MIC29201-3.3BU is sourced from the original manufacturer or authorized distributors?
All MIC29201-3.3BU 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 MIC29201-3.3BU meets industry standards.
7.What is the process for return or replacement of MIC29201-3.3BU?
All MIC29201-3.3BU units undergo pre-shipment inspection (PSI). If there is an issue with MIC29201-3.3BU, 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 MIC29201-3.3BU part is unused and in its original packaging.
Return procedure for MIC29201-3.3BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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