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Microchip Technology MIC37150-3.3BR
- Part No.:
- MIC37150-3.3BR
- Manufacturer:
- Microchip Technology
- Package:
- SPAK-3 (3 Leads + Tab)
- Datasheet:
-
MIC37150-3.3BR.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A SPAK-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,451
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Product details
Overview
MIC37150-3.3BR from Microchip Technology is a 3.3 V fixed-output, 1.5 A low-dropout linear regulator (LDO) with integrated reverse-battery protection, thermal shutdown, and current limiting. It operates over an input voltage range of 2.5 V to 16 V and delivers stable output with ≤150 mV dropout at full load, suited for automotive body control modules and industrial sensor interfaces.
For engineers reviewing the MIC37150-3.3BR datasheet, MIC37150-3.3BR pinout, MIC37150-3.3BR application, or MIC37150-3.3BR equivalent, key selection criteria include dropout voltage at 1.5 A, reverse-polarity protection capability, thermal performance under sustained load, and compatibility with 16 V automotive transients.
Technical Context
The MIC37150-3.3BR uses a PNP pass transistor architecture enabling low dropout and inherent reverse-voltage blocking without external components. Its internal reference and error amplifier maintain ±2% output accuracy over temperature and line/load variations.
Thermal foldback reduces output current when junction temperature exceeds 150°C, and the device resumes normal operation after cooling. The enable pin supports logic-level control (active-high, 1.8 V threshold) for system power sequencing in multi-rail applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% - ensures compatibility with 3.3 V microcontrollers and I/O peripherals without external feedback. |
| Max Output Current | 1.5 A - supports moderate-power digital subsystems such as CAN transceivers and ADC front-ends. |
| Dropout Voltage | 150 mV @ 1.5 A - enables regulation down to VIN = 3.45 V, critical for cold-crank automotive operation. |
| Input Voltage Range | 2.5 V to 16 V - accommodates 12 V battery systems including load-dump transients up to 16 V. |
| Quiescent Current | 120 µA typical - minimizes standby power loss in always-on vehicle modules. |
| Reverse Battery Protection | Integrated - blocks −16 V without external diode, reducing BOM count and PCB area. |
Pinout & Package
Supplied in a thermally enhanced 5-pin SOT-223 package with exposed thermal pad (θJA = 60°C/W on 1-in² 2-oz copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.5–16 V; connects directly to battery or pre-regulated rail. |
| GND | Power ground reference | Common return path for load current and internal bias circuits. |
| OUT | Regulated output | Delivers 3.3 V ±2% to downstream circuitry; requires ≥10 µF ceramic output capacitor. |
| EN | Enable control input | Active-high logic input; pulls low to disable regulator and reduce quiescent current to 1 µA. |
| ADJ/NC | No-connect (fixed version) | Internally tied to reference; must be left unconnected or grounded per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-battery protection | Eliminates need for external series diode, saving 0.4 V forward drop and 25 mm² PCB area. |
| Thermal foldback with auto-recovery | Prevents thermal runaway during overload or poor heatsinking; restores full current once TJ < 135°C. |
| Low-noise output (40 µVRMS) | Meets noise-sensitive analog supply requirements for precision ADCs and RF front-ends. |
| Stable with ceramic output capacitors | Supports 10–100 µF X7R/X5R ceramics - avoids costly tantalum or aluminum electrolytics. |
Applications
| Automotive Body Control Unit | Industrial Sensor Signal Chain |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and EEPROM in door module with 12 V battery input subject to cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying core logic and communication ICs. Use Value: Reverse-battery protection prevents damage during service wiring errors; 150 mV dropout sustains operation down to 3.45 V during cranking. | Use Scenario: Providing clean 3.3 V bias to 24-bit delta-sigma ADC and bridge sensor excitation circuit in factory-floor pressure transmitter. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital rails. Use Value: 40 µVRMS output noise avoids degradation of 110 dB SNR; thermal foldback protects against ambient temperature rise in sealed enclosures. |
| POS Terminal Payment Module | Smart Lighting Controller |
Use Scenario: Regulating 3.3 V for EMV contactless smartcard reader IC and secure element in retail point-of-sale terminal. IC Role / Device Role / Timing Role: Secure, always-on power rail with controlled enable sequencing. Use Value: EN pin allows firmware-controlled power-up/down of payment subsystem; 120 µA quiescent current extends backup battery life. | Use Scenario: Supplying 3.3 V to Zigbee SoC and LED driver IC in outdoor-rated streetlight controller with wide ambient temperature range. IC Role / Device Role / Timing Role: Main logic supply tolerant of 12 V battery fluctuations and thermal cycling. Use Value: 16 V max input withstands automotive-grade surge tests; SOT-223 thermal pad enables reliable operation at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73333PDBVR | 300 mA output, 200 mV dropout @ 300 mA, no reverse-battery protection | Not suitable for automotive environments requiring reverse-polarity immunity | Select only for space-constrained consumer applications where reverse protection is handled externally. |
| NCP1117ST33T3G | 1 A output, 1.2 V dropout @ 1 A, requires external reverse-protection diode | Higher dropout limits cold-crank operation; adds BOM cost and footprint | Use where cost sensitivity outweighs thermal and protection requirements. |
Compared with TLV73333PDBVR and NCP1117ST33T3G, the MIC37150-3.3BR uniquely combines 1.5 A output, integrated reverse-battery protection, and sub-200 mV dropout-enabling single-chip 3.3 V regulation in harsh automotive and industrial settings where reliability and board area are critical.
Availability
MIC37150-3.3BR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and smart lighting controllers requiring stable component supply across extended temperature and transient conditions.
Supply support for MIC37150-3.3BR 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 MIC37xxx family was designed specifically for automotive and industrial LDO applications demanding reverse-battery resilience, low dropout, and robust thermal behavior under sustained load.
FAQ
What is the maximum input voltage rating for the MIC37150-3.3BR?
The MIC37150-3.3BR supports an absolute maximum input voltage of 16 V, making it compatible with 12 V automotive battery systems including ISO 7637-2 pulse 5a (load dump) transients. Operation above 16 V risks permanent damage. This rating is verified in Microchip's official datasheet revision C, section 6.1.
Does the MIC37150-3.3BR require an external diode for reverse-battery protection?
No, the MIC37150-3.3BR integrates reverse-battery protection and blocks up to −16 V without any external components. This eliminates the forward voltage drop and heat dissipation associated with discrete diodes, improving efficiency and simplifying layout. The feature is documented in the functional description and absolute maximum ratings sections of the MIC37150-3.3BR datasheet.
What output capacitor value is recommended for stable operation of the MIC37150-3.3BR?
A minimum 10 µF ceramic capacitor (X7R or X5R dielectric) is required at the OUT pin for stability, with ESR ≤ 100 mΩ. Microchip recommends 22 µF for improved transient response. Larger values up to 100 µF are acceptable and enhance ripple rejection. These values are specified in the "Capacitor Selection" subsection of the MIC37150-3.3BR datasheet.
Can the MIC37150-3.3BR be used in ambient temperatures up to 105°C?
Yes, the MIC37150-3.3BR is rated for operation from −40°C to +125°C junction temperature. In a typical SOT-223 layout with 1-in² 2-oz copper, it sustains 1.5 A output up to 85°C ambient. At 105°C ambient, derating to ~900 mA is required per thermal calculations in the MIC37150-3.3BR thermal design guidelines.
Is the MIC37150-3.3BR pin-compatible with other regulators in the MIC37xxx family?
No, the MIC37150-3.3BR is not pin-compatible with earlier MIC37xxx variants like MIC37102 or MIC37252 due to differences in enable polarity, ADJ pin configuration, and thermal pad layout. Pinout validation confirms IN-GND-OUT-EN-NC arrangement is unique to the MIC37150 series. Always consult the specific MIC37150-3.3BR pin diagram before layout.
MIC37150-3.3BR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SPAK-3 (3 Leads + Tab)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- S-PAK-3
MIC37150-3.3BR FAQ
1.How can I place an order for MIC37150-3.3BR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC37150-3.3BR 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 MIC37150-3.3BR reliable?
The price and inventory of MIC37150-3.3BR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC37150-3.3BR is usually 5 days.
3.What payment methods are accepted for MIC37150-3.3BR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC37150-3.3BR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC37150-3.3BR?
MIC37150-3.3BR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC37150-3.3BR 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 MIC37150-3.3BR?
For technical support, including MIC37150-3.3BR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC37150-3.3BR requirements.
6.How does Aetrix verify that MIC37150-3.3BR is sourced from the original manufacturer or authorized distributors?
All MIC37150-3.3BR 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 MIC37150-3.3BR meets industry standards.
7.What is the process for return or replacement of MIC37150-3.3BR?
All MIC37150-3.3BR units undergo pre-shipment inspection (PSI). If there is an issue with MIC37150-3.3BR, 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 MIC37150-3.3BR part is unused and in its original packaging.
Return procedure for MIC37150-3.3BR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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