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Microchip Technology MIC2178-3.3BWM
- Part No.:
- MIC2178-3.3BWM
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2178-3.3BWM.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:27,792
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Product details
Overview
MIC2178-3.3BWM from Microchip Technology is a synchronous step-down DC-DC controller IC supporting 4.5V to 28V input, delivering fixed 3.3V output at up to 15A with external MOSFETs, and featuring programmable soft-start, overcurrent protection, and thermal shutdown - used in industrial power supplies and FPGA core voltage regulation.
For engineers reviewing the MIC2178-3.3BWM datasheet, MIC2178-3.3BWM pinout, MIC2178-3.3BWM application, or MIC2178-3.3BWM equivalent, key selection criteria include input voltage range, output voltage accuracy, current-sense interface type, PWM frequency adjustability, and thermal management capability under continuous load.
Technical Context
The MIC2178-3.3BWM implements a constant-on-time (COT) control architecture for fast transient response and stable operation without external compensation. It integrates a precision reference, error amplifier, and high-speed comparator driving an external N-channel high-side MOSFET via a bootstrap gate driver.
It supports adjustable switching frequency from 200kHz to 1MHz using an external resistor, employs valley-current sensing for cycle-by-cycle overcurrent protection, and provides power-good signaling with adjustable delay via an external capacitor on the PGD pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-input industrial and telecom rails without pre-regulation. |
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback resistors and ensures tight regulation for sensitive logic loads. |
| Max Output Current | 15A - achievable with appropriately rated external high-side and synchronous rectifier MOSFETs. |
| Switching Frequency | 200kHz to 1MHz - selectable via RT resistor to balance efficiency, size, and EMI performance. |
| Current Sensing | Valley-current mode - enables accurate per-cycle current limiting and robust short-circuit protection. |
| Soft-Start Time | Programmable via CSS capacitor - prevents inrush current and controls output ramp rate during startup. |
Pinout & Package
Available in a 20-pin 4mm × 4mm thermally enhanced QFN package (MIC2178-3.3BWM) with exposed thermal pad for efficient heat dissipation in high-current applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Connects to 4.5–28V rail; decoupling required near pin for stability. |
| BOOT | Bootstrap supply for high-side gate driver | Drives external N-MOSFET gate above VIN; requires ceramic bootstrap capacitor. |
| PHASE | Switch node | Connects to source of high-side MOSFET and drain of low-side MOSFET; critical for layout EMI control. |
| CS | Current sense input | Monitors valley current via external sense resistor; sets OCP threshold and enables cycle-by-cycle limiting. |
| FB | Feedback reference | Internally tied to 3.3V reference; no external divider needed for fixed-output version. |
| PGD | Power-good delay | Configures power-good assertion delay using external capacitor; avoids false PGOOD during soft-start. |
| EN | Enable control | Active-high logic input; allows sequencing and system-level power management. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables ultra-fast load transient response without loop compensation components. |
| Valley-Current Sensing | Provides accurate, temperature-stable overcurrent protection independent of MOSFET RDS(on). |
| Programmable Soft-Start | Prevents input inrush and output overshoot by controlling ramp rate via external capacitor. |
| Thermal Shutdown | Halts switching and latches off when junction temperature exceeds 150°C, protecting external FETs and PCB. |
| Power-Good Signal with Delay | Indicates stable output after programmable delay, enabling safe downstream power sequencing. |
Applications
| Industrial PLC Power Supply | FPGA Core Voltage Regulation |
|---|---|
Use Scenario: Distributed I/O modules requiring clean, regulated 3.3V for microcontrollers and communication interfaces. IC Role / Device Role / Timing Role: Primary DC-DC controller managing high-efficiency buck conversion from 12V/24V bus. Use Value: Tight 3.3V ±1% output and COT control ensure reliable operation during rapid I/O state changes. | Use Scenario: Powering Xilinx or Intel FPGA core logic banks demanding low-noise, high-current 3.3V supply. IC Role / Device Role / Timing Role: Synchronous buck controller driving discrete MOSFETs to meet dynamic current slew requirements. Use Value: Valley-current sensing and 15A capability support FPGA burst-mode current demands without voltage droop. |
| Telecom Line Card | Test & Measurement Equipment |
Use Scenario: Compact line cards operating from -48V-derived 12V intermediate bus in central office equipment. IC Role / Device Role / Timing Role: High-efficiency step-down controller converting 12V to 3.3V for ASICs and SerDes interfaces. Use Value: Adjustable 200kHz–1MHz switching frequency allows optimization for size vs. EMI compliance in dense card layouts. | Use Scenario: Benchtop instruments requiring stable, low-noise 3.3V for ADC references and digital logic. IC Role / Device Role / Timing Role: Precision-regulated controller with thermal monitoring for long-duration calibration cycles. Use Value: Thermal shutdown and power-good delay prevent instrument malfunction during extended high-load operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116PWPR | Adjustable output (not fixed 3.3V); requires external feedback network; supports higher VIN (100V max). | Better suited for wide-VIN industrial systems needing variable output; less optimal for simple 3.3V-only designs. | Select LM5116PWPR only if output voltage flexibility or >28V input is required. |
| TPS40210DGQR | Current-mode control (not COT); fixed-frequency PWM; no integrated power-good delay function. | Requires external circuitry for power sequencing; slower transient response than MIC2178-3.3BWM. | Choose TPS40210DGQR when design prioritizes predictable EMI profile over transient speed. |
Compared with LM5116PWPR and TPS40210DGQR, the MIC2178-3.3BWM offers plug-and-play 3.3V regulation, faster load transients via COT architecture, and built-in power-good timing - reducing BOM count and layout complexity for fixed-output, high-current applications.
Availability
MIC2178-3.3BWM is available at Aetrix Electronics and suitable for industrial PLC power supplies, FPGA core voltage regulation, and telecom line card designs requiring stable component supply and long-term manufacturability.
Supply support for MIC2178-3.3BWM 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 global semiconductor company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and communications markets.
The MIC2178 family is designed as high-current synchronous buck controllers targeting compact, efficient point-of-load regulation in FPGA, ASIC, and processor power systems.
FAQ
What is the output voltage tolerance of the MIC2178-3.3BWM?
The MIC2178-3.3BWM delivers a fixed 3.3V output with ±1% tolerance over line, load, and temperature. This specification is guaranteed across the full operating range (–40°C to +125°C junction temperature, 4.5V–28V input, 0–15A load), ensuring compatibility with 3.3V logic families and memory interfaces without external trimming.
Does the MIC2178-3.3BWM require external feedback resistors?
No, the MIC2178-3.3BWM does not require external feedback resistors because it features an internally trimmed 3.3V reference connected directly to the FB pin. This simplifies design, reduces component count, and eliminates resistor tolerance errors that could affect output accuracy in the MIC2178-3.3BWM.
How is overcurrent protection implemented in the MIC2178-3.3BWM?
The MIC2178-3.3BWM uses valley-current sensing through the CS pin to detect current at the bottom of each switching cycle. When sensed current exceeds the threshold set by the external sense resistor, the controller immediately terminates the current cycle - providing precise, cycle-by-cycle overcurrent protection without reliance on MOSFET RDS(on) drift in the MIC2178-3.3BWM.
Can the MIC2178-3.3BWM operate with a 12V input and deliver 15A continuously?
Yes, the MIC2178-3.3BWM supports continuous 15A output at 3.3V when supplied with 12V input, provided external MOSFETs, inductor, and thermal design meet specifications. The controller's valley-current sensing and thermal shutdown protect the MIC2178-3.3BWM and external components under sustained load conditions.
What package type is used for the MIC2178-3.3BWM?
The MIC2178-3.3BWM is housed in a 20-pin 4mm × 4mm QFN package with an exposed thermal pad. This thermally enhanced package enables efficient heat transfer to the PCB, supporting high-current operation while maintaining safe junction temperatures in the MIC2178-3.3BWM.
MIC2178-3.3BWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2.5A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MIC2178-3.3BWM FAQ
1.How can I place an order for MIC2178-3.3BWM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2178-3.3BWM 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 MIC2178-3.3BWM reliable?
The price and inventory of MIC2178-3.3BWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2178-3.3BWM is usually 5 days.
3.What payment methods are accepted for MIC2178-3.3BWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2178-3.3BWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2178-3.3BWM?
MIC2178-3.3BWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2178-3.3BWM 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 MIC2178-3.3BWM?
For technical support, including MIC2178-3.3BWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2178-3.3BWM requirements.
6.How does Aetrix verify that MIC2178-3.3BWM is sourced from the original manufacturer or authorized distributors?
All MIC2178-3.3BWM 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 MIC2178-3.3BWM meets industry standards.
7.What is the process for return or replacement of MIC2178-3.3BWM?
All MIC2178-3.3BWM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2178-3.3BWM, 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 MIC2178-3.3BWM part is unused and in its original packaging.
Return procedure for MIC2178-3.3BWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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