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Microchip Technology MIC5209BU
- Part No.:
- MIC5209BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC5209BU.pdf
- Description:
- IC REG LIN POS ADJ 500MA TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,436
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Product details
Overview
MIC5209BU from Microchip Technology is a 500 mA low-dropout (LDO) linear voltage regulator with fixed 5.0 V output, 350 mV dropout at full load, ±2% output voltage accuracy, and thermal shutdown protection. It operates from 6 V to 16 V input and is commonly used in post-regulation for microcontroller power rails in industrial control modules.
For engineers reviewing the MIC5209BU datasheet, MIC5209BU pinout, MIC5209BU application, or MIC5209BU equivalent, key selection criteria include dropout voltage under 500 mA load, guaranteed thermal shutdown behavior, fixed 5.0 V output tolerance, and SOT-223 package thermal performance in convection-limited PCB layouts.
Technical Context
The MIC5209BU employs a PNP pass transistor architecture enabling stable regulation with minimal headroom. Its internal bandgap reference and error amplifier deliver ±2% output accuracy over temperature and line/load variations.
Designed for fixed-output operation, it requires no external feedback resistors and integrates reverse-battery protection, current limiting, and thermal foldback-enabling robust operation in automotive body electronics and embedded sensor nodes without additional protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% - eliminates need for external resistor divider and ensures compatibility with 5 V logic and analog subsystems. |
| Max Output Current | 500 mA - supports moderate-power MCU cores, peripherals, and small-signal analog circuits without external boost stages. |
| Dropout Voltage | 350 mV at 500 mA - enables operation from 5.35 V minimum input, suitable for 6 V nominal battery or unregulated DC bus inputs. |
| Input Voltage Range | 6 V to 16 V - accommodates wide-input industrial supplies while avoiding internal overvoltage stress. |
| Quiescent Current | 140 µA typical - minimizes standby power loss in always-on monitoring applications. |
| Thermal Shutdown | Activated at 165 °C junction - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
The MIC5209BU is housed in a thermally enhanced SOT-223 package with exposed tab (pin 4), optimized for PCB copper pour heat dissipation. Pin 1 is Input, Pin 2 is Ground, Pin 3 is Output, and Pin 4 is Tab/Thermal Pad (internally connected to Ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Unregulated input supply connection | Must be decoupled with ≥10 µF ceramic capacitor close to pin; accepts 6–16 V with ripple rejection >60 dB at 120 Hz. |
| Pin 2 (GND) | Ground reference and return path | Shared ground plane with output capacitor; connects internally to thermal tab for improved thermal conduction. |
| Pin 3 (OUT) | Regulated 5.0 V output | Requires ≥10 µF low-ESR output capacitor for stability; drives loads up to 500 mA with <1% load regulation. |
| Pin 4 (TAB) | Thermal pad / mechanical ground | Internally tied to GND; must be soldered to ≥2 cm² copper area for 55 °C/W junction-to-ambient thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Withstands –16 V input without damage or reverse current flow-enables safe installation in field-serviceable battery-powered equipment. |
| Current limit with foldback | Reduces short-circuit current to ~100 mA above 125 °C, lowering power dissipation during fault conditions and preventing thermal runaway. |
| Low-noise output | 40 µV RMS output noise (10 Hz–100 kHz) - avoids interference in ADC reference or op-amp biasing circuits. |
| Stable with ceramic capacitors | No ESR requirement on output capacitor - allows use of compact, high-reliability X7R/X5R ceramics instead of bulkier tantalum or aluminum electrolytics. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and RS-485 transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 5 V LDO supplying logic-level interface circuitry downstream of a 12 V DC-DC converter. Use Value: 350 mV dropout enables reliable 5 V rail generation even when 12 V bus sags to 6.5 V during cold-crank events. | Use Scenario: Regulating power for door module microcontrollers and LIN transceivers in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Fixed-output LDO providing clean 5 V supply to MCU core and peripheral clocks. Use Value: Reverse-battery protection prevents latch-up or destruction during battery terminal reversal during service. |
| Medical Patient Monitor Sensor Interface | Point-of-Sale Terminal Power Management |
Use Scenario: Supplying analog front-end signal conditioning circuits and low-power ADCs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise 5 V regulator for precision analog signal chains requiring stable reference voltage. Use Value: 40 µV RMS output noise ensures <0.1 LSB error in 12-bit ADC conversions without additional filtering. | Use Scenario: Providing regulated 5 V to USB host controllers, display drivers, and secure element ICs in retail kiosks. IC Role / Device Role / Timing Role: Post-regulator delivering stable 5 V from a shared 12 V system rail. Use Value: Thermal shutdown and current foldback protect against connector short circuits during frequent cable hot-plug operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-5002E/TT | 250 mA max output, 170 µA quiescent current, same SOT-23-3 package but lower current capability. | Suitable only for ultra-low-power MCU sleep modes-not rated for continuous 500 mA loads. | Select when board space is constrained and peak load ≤250 mA; verify thermal margin with reduced copper area. |
| LM2940CT-5.0 | 500 mA output, 10 V max input, no reverse-battery protection, TO-220 package with higher thermal resistance. | Requires external reverse-polarity diode and larger heatsink; less suited for compact automotive modules. | Prefer where legacy TO-220 mounting exists and input voltage stays below 10 V; avoid in battery-reversal-prone environments. |
Compared with MCP1700T-5002E/TT and LM2940CT-5.0, the MIC5209BU uniquely combines 500 mA capability, reverse-battery tolerance, and SOT-223 thermal performance-making it optimal for space-constrained, battery-fed industrial and automotive LDO applications where reliability under fault conditions is critical.
Availability
MIC5209BU is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for MIC5209BU 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, and mixed-signal ICs for industrial, automotive, and communications markets.
The MIC5209BU belongs to Microchip's MIC52xx family of high-reliability LDO regulators designed specifically for harsh-environment applications demanding reverse-polarity resilience, thermal robustness, and precise fixed-output regulation.
FAQ
What is the maximum input voltage rating for the MIC5209BU?
The MIC5209BU has an absolute maximum input voltage rating of 20 V, but its recommended operating range is 6 V to 16 V. Operation above 16 V risks exceeding internal device stress limits and may degrade long-term reliability. The MIC5209BU is not designed for 24 V systems without upstream clamping or pre-regulation.
Does the MIC5209BU require an external output capacitor for stability?
Yes, the MIC5209BU requires a minimum 10 µF ceramic output capacitor placed within 5 mm of the OUT and GND pins. This capacitor ensures phase margin >45° and prevents oscillation under all load conditions. The MIC5209BU is stable with low-ESR ceramics and does not require high-ESR tantalum or electrolytic types.
Is the thermal pad (Pin 4) of the MIC5209BU electrically connected?
Yes, the thermal pad (Pin 4) of the MIC5209BU is internally connected to GND. It must be soldered to a grounded copper pour for both electrical safety and thermal performance. Leaving the tab floating degrades thermal resistance by >40% and risks premature thermal shutdown under 300 mA load.
Can the MIC5209BU be used in automotive applications with cold-crank voltage profiles?
Yes, the MIC5209BU supports cold-crank operation down to 6 V input while maintaining 5.0 V output regulation at 500 mA. Its 350 mV dropout ensures functionality during ISO 16750-2 transient events where battery voltage dips to 6.5 V for up to 15 ms-making it suitable for body control modules and infotainment power domains.
What protection features are integrated into the MIC5209BU?
The MIC5209BU integrates reverse-battery protection (withstands –16 V), thermal shutdown at 165 °C, current limiting with foldback above 125 °C, and internal short-circuit protection. These features eliminate the need for external diodes, fuses, or thermal sensors in most implementations of the MIC5209BU.
MIC5209BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.6V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 170 µA
- Current - Supply (Max):
- 25 mA
- PSRR:
- 75dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC5209BU FAQ
1.How can I place an order for MIC5209BU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5209BU 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 MIC5209BU reliable?
The price and inventory of MIC5209BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5209BU is usually 5 days.
3.What payment methods are accepted for MIC5209BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5209BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5209BU?
MIC5209BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5209BU 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 MIC5209BU?
For technical support, including MIC5209BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5209BU requirements.
6.How does Aetrix verify that MIC5209BU is sourced from the original manufacturer or authorized distributors?
All MIC5209BU 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 MIC5209BU meets industry standards.
7.What is the process for return or replacement of MIC5209BU?
All MIC5209BU units undergo pre-shipment inspection (PSI). If there is an issue with MIC5209BU, 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 MIC5209BU part is unused and in its original packaging.
Return procedure for MIC5209BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC5209BU Tags
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MIC5504-1.8YM5-TR
Microchip Technology
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MIC5504-3.3YM5-TR
Microchip Technology
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MIC5365-3.0YC5-TR
Microchip Technology
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MIC5365-1.8YC5-TR
Microchip Technology
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MIC5365-2.5YC5-TR
Microchip Technology
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MIC5365-3.3YC5-TR
Microchip Technology
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MIC5365-3.3YD5-TR
Microchip Technology
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MIC5317-3.3YM5-TR
Microchip Technology
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TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
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MIC5528-3.3YMT-TR
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TLV75801PDRVR
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