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Microchip Technology MIC39151-1.8BT
- Part No.:
- MIC39151-1.8BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC39151-1.8BT.pdf
- Description:
- IC REG LINEAR 1.8V 1.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:11,334
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Product details
Overview
MIC39151-1.8BT from Microchip Technology is a 1.5 A low-dropout linear regulator (LDO) with fixed 1.8 V output, 350 mV dropout at full load, thermal shutdown, and reverse-battery protection - used in FPGA core power, microcontroller I/O rails, and portable instrumentation.
For engineers reviewing the MIC39151-1.8BT datasheet, MIC39151-1.8BT pinout, MIC39151-1.8BT application, or MIC39151-1.8BT equivalent, key selection criteria include guaranteed 1.5 A output current over temperature, ±2% output voltage accuracy, integrated thermal foldback, and TO-263-5 package compatibility with high-power PCB layouts.
Technical Context
The MIC39151-1.8BT operates as a single-output positive LDO regulator using PNP pass transistor architecture, enabling stable regulation with input voltages from 2.25 V to 16 V. It integrates internal current limiting and thermal shutdown with automatic recovery, supporting continuous operation under transient overload conditions without external components.
Its reference voltage is trimmed during final test for ±2% output accuracy across –40°C to +125°C, and the device maintains stability with 10 µF minimum ceramic output capacitance - no ESR requirements. The enable pin supports logic-level ON/OFF control with 1.2 V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% over temperature and line/load |
| Max Output Current | 1.5 A continuous; limited by thermal derating above +85°C ambient |
| Dropout Voltage | 350 mV at 1.5 A, ensuring regulation down to VIN = 2.15 V |
| Input Voltage Range | 2.25 V to 16 V - supports single-cell Li-ion plus headroom or 12 V rail conditioning |
| Quiescent Current | 45 mA typical at full load; drops to 150 µA in shutdown mode |
| Thermal Protection | Internal thermal shutdown with hysteresis; auto-recovery after cooldown |
Pinout & Package
Package: TO-263-5 (D2PAK), surface-mount, thermally enhanced with exposed tab tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.25–16 V; requires local 1 µF ceramic bypass |
| GND | Ground reference | Common return; connects to exposed tab for thermal conduction |
| OUT | Regulated output | Delivers 1.8 V ±2%; requires ≥10 µF ceramic output capacitor |
| EN | Enable control input | Active-high; drives ON when ≥1.2 V, OFF when ≤0.4 V |
| ADJ/SENSE | Output voltage sense | Internally connected to OUT; not user-accessible in fixed-version MIC39151-1.8BT |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Prevents damage from accidental battery reversal; no external diode needed |
| Low-noise operation | 40 µVRMS output noise (10 Hz–100 kHz); suitable for noise-sensitive analog rails |
| Stable with ceramic capacitors | No ESR requirement; enables compact, low-cost, high-reliability output filtering |
| Logic-compatible enable | Direct interface to MCU GPIO without level-shifting; supports power sequencing |
Applications
| FPGA Core Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 1.8 V core logic of Xilinx Spartan-7 or Intel MAX 10 FPGAs in factory-floor controllers. IC Role / Device Role / Timing Role: Primary core voltage regulator delivering clean, low-noise 1.8 V at up to 1.5 A with fast transient response. Use Value: Maintains FPGA configuration integrity during burst-mode operation; thermal foldback prevents latch-up during short-circuit events on downstream logic. | Use Scenario: Supplying isolated 1.8 V digital I/O rails in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 5 V or 12 V backplane voltage to FPGA I/O or ADC interface voltage. Use Value: Reverse-battery protection safeguards against field wiring errors; wide input range accommodates aging 12 V supplies. |
| Portable Test Equipment | Medical Sensor Interface |
Use Scenario: Powering 1.8 V ADC drivers and precision op-amps in handheld multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Low-noise analog supply rail generator with tight DC accuracy and minimal PSRR degradation. Use Value: 40 µVRMS noise and ±2% tolerance ensure sub-LSB error in 16-bit data acquisition systems. | Use Scenario: Supplying 1.8 V bias to MEMS pressure sensors and low-power signal-conditioning ASICs in wearable monitors. IC Role / Device Role / Timing Role: Always-on regulated rail with ultra-low quiescent current in shutdown mode (150 µA). Use Value: Enables >1-year battery life in coin-cell-powered devices while maintaining fast wake-up capability via EN pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B182MR-G | 1.8 V fixed, 300 mA max output; SOT-25 package; no reverse-battery protection | Limited to low-current sensor nodes; unsuitable for FPGA core loads | Select only for space-constrained, <300 mA applications where reverse protection is externally managed |
| ON Semiconductor NCP1117ST18T3G | 1.8 V fixed, 1 A max output; TO-220/TO-263; no enable pin or reverse-battery protection | Requires external enable circuitry and reverse-polarity diode; lower current headroom | Use where cost sensitivity outweighs feature set; verify thermal margin at 1.5 A with heatsinking |
Compared with MIC39151-1.8BT, the XC6219B182MR-G lacks current capacity and protection features, while the NCP1117ST18T3G omits both enable control and reverse-battery safety - making MIC39151-1.8BT the only choice for robust, high-current, feature-complete 1.8 V LDO deployment.
Availability
MIC39151-1.8BT is available at Aetrix Electronics and suitable for FPGA power delivery, industrial I/O modules, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC39151-1.8BT 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 MIC39151 series is designed as high-current, feature-rich LDO regulators targeting demanding embedded power applications where reliability, protection, and low noise are critical.
FAQ
What is the maximum input voltage rating for MIC39151-1.8BT?
The MIC39151-1.8BT supports an absolute maximum input voltage of 16 V. Operation beyond this limit risks permanent damage. For reliable long-term use, Microchip recommends staying within the specified 2.25 V to 16 V operating range, with derating advised above +85°C ambient due to thermal constraints. The MIC39151-1.8BT includes internal protection but is not rated for transient overvoltage events exceeding 16 V.
Does MIC39151-1.8BT require an external capacitor on the ADJ/SENSE pin?
No - the MIC39151-1.8BT is a fixed-output variant; its ADJ/SENSE terminal is internally connected to the OUT pin and not accessible for external feedback. Only IN and OUT require external capacitors: a 1 µF ceramic at IN and ≥10 µF ceramic at OUT. The MIC39151-1.8BT achieves stability without ESR requirements or additional compensation components.
Can MIC39151-1.8BT be used in automotive applications?
The MIC39151-1.8BT is qualified to AEC-Q100 Grade 3 (–40°C to +85°C ambient), not Grade 1 (–40°C to +125°C). While it operates across –40°C to +125°C junction temperature, its standard qualification does not cover full automotive under-hood environments. For automotive use, MIC39151-1.8BT must undergo system-level validation; consult Microchip's automotive product roadmap for AEC-Q100 Grade 1 alternatives.
What is the shutdown current of MIC39151-1.8BT when EN is pulled low?
When the EN pin is driven below 0.4 V, the MIC39151-1.8BT enters shutdown mode with typical quiescent current of 150 µA. This low leakage enables extended battery life in portable systems. The MIC39151-1.8BT retains its output regulation state upon wake-up and resumes full operation within 50 µs after EN rises above 1.2 V.
Is thermal pad connection mandatory for MIC39151-1.8BT in TO-263-5 package?
Yes - the exposed thermal pad on the MIC39151-1.8BT's TO-263-5 package must be soldered to a large GND copper area for effective heat dissipation. Microchip specifies ≥4 cm² of 2-oz copper with ≥4 thermal vias for 1.5 A continuous operation at +70°C ambient. Omitting thermal pad connection risks thermal shutdown activation and reduced output current capability. The MIC39151-1.8BT's GND pin and thermal pad are electrically common.
MIC39151-1.8BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
MIC39151-1.8BT FAQ
1.How can I place an order for MIC39151-1.8BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC39151-1.8BT 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 MIC39151-1.8BT reliable?
The price and inventory of MIC39151-1.8BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC39151-1.8BT is usually 5 days.
3.What payment methods are accepted for MIC39151-1.8BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC39151-1.8BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC39151-1.8BT?
MIC39151-1.8BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC39151-1.8BT 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 MIC39151-1.8BT?
For technical support, including MIC39151-1.8BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC39151-1.8BT requirements.
6.How does Aetrix verify that MIC39151-1.8BT is sourced from the original manufacturer or authorized distributors?
All MIC39151-1.8BT 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 MIC39151-1.8BT meets industry standards.
7.What is the process for return or replacement of MIC39151-1.8BT?
All MIC39151-1.8BT units undergo pre-shipment inspection (PSI). If there is an issue with MIC39151-1.8BT, 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 MIC39151-1.8BT part is unused and in its original packaging.
Return procedure for MIC39151-1.8BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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