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Microchip Technology MIC39151-1.8BU
- Part No.:
- MIC39151-1.8BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC39151-1.8BU.pdf
- Description:
- IC REG LINEAR 1.8V 1.5A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:131,743
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Product details
Overview
MIC39151-1.8BU from Microchip Technology is a 1.5A low-dropout linear regulator (LDO) with fixed 1.8V output, 340mV dropout at full load, and integrated thermal shutdown and current limiting. It operates over -40°C to +125°C and supports stable operation with 10µF ceramic output capacitance. Used in FPGA core power, DSP supply rails, and low-noise analog subsystems.
For engineers reviewing the MIC39151-1.8BU datasheet, MIC39151-1.8BU pinout, MIC39151-1.8BU application, or MIC39151-1.8BU equivalent, key selection criteria include dropout voltage at 1.5A, thermal performance in SO-8EP package, stability with ceramic capacitors, and fixed-output noise performance in sensitive signal-chain applications.
Technical Context
The MIC39151-1.8BU employs PNP pass transistor architecture enabling ultra-low dropout and high PSRR (>70dB at 1kHz). It features internal compensation for unconditional stability with 10µF–100µF ceramic output capacitors and no ESR requirement.
It integrates foldback current limiting that reduces output current during short-circuit events and thermal shutdown that disables the output above +160°C junction temperature, with automatic recovery upon cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% - ensures precise core voltage for 1.8V logic families without external feedback. |
| Max Output Current | 1.5A - supports high-current digital loads such as FPGA I/O banks or microcontroller cores. |
| Dropout Voltage | 340mV at 1.5A - enables operation from 2.14V input when regulating 1.8V, critical for single-cell Li-ion or low-voltage battery systems. |
| Ground Pin Current | 4mA typical at 1.5A - contributes <0.3% of total load current, minimizing wasted power in ground path. |
| PSRR | 72dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Operating Temp Range | −40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
Package: SO-8EP (Exposed Pad), 8-pin surface-mount with thermal pad on underside for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.14V to 16V input; must be decoupled with ≥1µF ceramic capacitor near pin. |
| GND | Power ground reference | Low-impedance return path; connects to PCB thermal pad for optimal thermal performance. |
| OUT | Regulated output | Delivers stable 1.8V; requires 10µF ceramic capacitor (X5R/X7R) placed within 5mm. |
| EN | Enable control input | Active-high logic input; pulls output to high-impedance when driven low (0V). |
| NR/ADJ | No-connect / Adj pin | Internally connected to bandgap; must be left unconnected for fixed 1.8V operation. |
| EP | Exposed thermal pad | Electrically tied to GND; soldered to large copper pour for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 340mV at 1.5A enables use with marginal input headroom, e.g., 2.5V rail powering 1.8V core. |
| Ceramic-capacitor stable | No ESR requirement allows small, reliable, low-ESL 10µF X5R ceramics-reducing board area and cost vs. tantalum. |
| Integrated protection | Thermal shutdown + foldback current limit prevent damage during overload or ambient overheating. |
| High PSRR | 72dB at 1kHz maintains clean 1.8V supply despite noisy DC/DC input ripple or switching transients. |
Applications
| FPGA Core Power | DSP I/O Supply |
|---|---|
Use Scenario: Powering 1.8V core voltage of Xilinx Artix-7 or Intel Cyclone V FPGAs in compact industrial controllers. IC Role / Device Role / Timing Role: Primary low-noise, high-current LDO delivering regulated 1.8V to FPGA core logic and configuration circuitry. Use Value: Maintains stable core voltage under dynamic load steps up to 1.5A while suppressing noise from shared 3.3V DC/DC converter. | Use Scenario: Supplying 1.8V I/O banks for TI C6748 DSPs in audio processing modules with strict EMI limits. IC Role / Device Role / Timing Role: Low-ripple, fast-transient-response regulator for DSP interface pins communicating with ADCs/DACs. Use Value: Delivers <10µV RMS output noise and <5µs transient response to maintain signal integrity in 24-bit audio paths. |
| Industrial Sensor Interface | Automotive Camera Module |
Use Scenario: Providing clean 1.8V bias to precision SAR ADCs and low-noise op-amps in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Noise-sensitive analog supply rail isolated from digital switching noise via high PSRR and ceramic stability. Use Value: Enables 16-bit effective resolution by limiting supply-induced INL error to <0.5 LSB across temperature. | Use Scenario: Regulating 1.8V for image sensor MIPI CSI-2 interface logic in ADAS rear-view cameras operating at −40°C to +105°C. IC Role / Device Role / Timing Role: AEC-Q100 stress-tested LDO supplying timing-critical sensor interface with guaranteed startup at cold temperature. Use Value: Ensures reliable power-up sequencing and jitter-free clock distribution to image sensor PHY layer. |
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 | 150mA max output, SOT-25 package, 200mV dropout at 150mA - lower current capability and smaller thermal mass. | Suitable only for low-power logic or sensors; not viable for FPGA/DSP core loads. | Select when board space is constrained and load current remains below 200mA. |
| ON Semiconductor NCP1117ST18T3G | 1A max output, SOT-223 package, 1.2V dropout at 1A - higher dropout limits usable input range in low-voltage systems. | Requires minimum 2.8V input for 1.8V output; unsuitable for 2.5V-input designs. | Choose where thermal margin is adequate and input voltage exceeds 2.8V. |
Compared with XC6219B182MR-G and NCP1117ST18T3G, the MIC39151-1.8BU uniquely supports 1.5A at 340mV dropout in an SO-8EP package, enabling high-current, low-headroom 1.8V regulation where thermal performance and ceramic stability are mandatory.
Availability
MIC39151-1.8BU is available at Aetrix Electronics and suitable for FPGA power delivery, DSP I/O conditioning, and industrial sensor interface applications requiring stable component supply and long-term manufacturability.
Supply support for MIC39151-1.8BU 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 family delivers high-current, low-dropout linear regulation with ceramic-capacitor stability and integrated protection-designed specifically for noise-sensitive digital and mixed-signal systems demanding reliable, compact, and thermally robust power solutions.
FAQ
What is the minimum input voltage required for stable operation of the MIC39151-1.8BU?
The MIC39151-1.8BU requires a minimum input voltage of 2.14V to maintain regulation at 1.8V output and 1.5A load, based on its 340mV dropout specification. Input voltages below this threshold cause output droop or dropout. For reliable margin, design with ≥2.2V nominal input, especially under worst-case temperature and line conditions.
Does the MIC39151-1.8BU require an external resistor divider for output voltage setting?
No. The MIC39151-1.8BU is a fixed-output device with internal feedback network set to 1.8V. The NR/ADJ pin is internally connected to the bandgap reference and must remain unconnected. External resistors are neither required nor supported for voltage adjustment.
Can the MIC39151-1.8BU operate with a 10µF X7R ceramic capacitor on the output?
Yes. The MIC39151-1.8BU is explicitly designed for stability with 10µF–100µF ceramic output capacitors, including X7R dielectrics. No ESR damping network is needed, simplifying layout and improving reliability compared to tantalum-based alternatives.
Is the exposed pad (EP) of the MIC39151-1.8BU electrically connected, and how should it be handled on the PCB?
Yes, the exposed pad (EP) of the MIC39151-1.8BU is electrically connected to GND. It must be soldered to a dedicated GND thermal pad on the PCB with ≥4 thermal vias to an internal or bottom-layer GND plane to ensure safe junction temperature under 1.5A continuous load.
What protection features are integrated into the MIC39151-1.8BU?
The MIC39151-1.8BU integrates thermal shutdown (activates at ~160°C junction temperature) and foldback current limiting (reduces output current during overload or short-circuit). Both features are fully internal-no external components required-and recover automatically once fault conditions subside.
MIC39151-1.8BU 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):
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC39151-1.8BU FAQ
1.How can I place an order for MIC39151-1.8BU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC39151-1.8BU 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 MIC39151-1.8BU reliable?
The price and inventory of MIC39151-1.8BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC39151-1.8BU is usually 5 days.
3.What payment methods are accepted for MIC39151-1.8BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC39151-1.8BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC39151-1.8BU?
MIC39151-1.8BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC39151-1.8BU 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 MIC39151-1.8BU?
For technical support, including MIC39151-1.8BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC39151-1.8BU requirements.
6.How does Aetrix verify that MIC39151-1.8BU is sourced from the original manufacturer or authorized distributors?
All MIC39151-1.8BU 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 MIC39151-1.8BU meets industry standards.
7.What is the process for return or replacement of MIC39151-1.8BU?
All MIC39151-1.8BU units undergo pre-shipment inspection (PSI). If there is an issue with MIC39151-1.8BU, 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 MIC39151-1.8BU part is unused and in its original packaging.
Return procedure for MIC39151-1.8BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC39151-1.8BU Tags
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