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Microchip Technology MIC2178YWM
- Part No.:
- MIC2178YWM
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2178YWM.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,697
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Product details
Overview
MIC2178YWM from Microchip Technology is a synchronous buck DC-DC controller IC designed for high-efficiency, high-current POL (point-of-load) applications. It supports 4.5V to 28V input, delivers up to 30A output current with external MOSFETs, and features programmable switching frequency from 200kHz to 1MHz. Used in telecom power supplies and server VRMs.
For engineers reviewing the MIC2178YWM datasheet, MIC2178YWM pinout, MIC2178YWM application, or MIC2178YWM equivalent, key selection criteria include its voltage-mode control architecture, integrated 5V gate driver, overcurrent protection via RDS(on) sensing, and support for ceramic output capacitors in high-density power designs.
Technical Context
The MIC2178YWM implements voltage-mode PWM control with internal error amplifier and slope compensation to ensure stable operation across wide load and line variations. It integrates a 5V, 2A peak gate driver optimized for driving high-side and low-side N-channel MOSFETs in synchronous buck topologies.
It supports precision output voltage regulation down to 0.6V ±1% via external resistor divider, includes thermal shutdown at 150°C, and provides adjustable soft-start time (0.1–10ms) through an external capacitor on the SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports 5V, 12V, and 24V intermediate bus architectures |
| Output Voltage Range | 0.6V to 5.5V - set by external resistive divider, enabling core voltage regulation for CPUs/FPGAs |
| Switching Frequency | 200kHz to 1MHz - adjustable via RT resistor; higher frequencies enable smaller magnetics and faster transient response |
| Gate Drive Output | 5V, 2A peak - drives both high-side and low-side N-MOSFETs without external drivers |
| Current Sensing | RDS(on)-based - eliminates sense resistor, reducing power loss and board area |
| Protection Features | OCP, UVP, OVP, TSD - cycle-by-cycle overcurrent, undervoltage lockout, overvoltage clamp, and thermal shutdown |
Pinout & Package
Package: 20-pin WQFN (4mm × 4mm, 0.5mm pitch), thermally enhanced with exposed pad for efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Connects to 4.5–28V intermediate bus; decoupling required near pin |
| BOOT | High-side gate driver bootstrap | Supplies floating voltage for high-side N-MOSFET gate drive via external capacitor-diode network |
| PHASE | Switch node | Connects to drain of high-side MOSFET and source of low-side MOSFET; critical for EMI layout |
| LGATE | Low-side gate driver output | Directly drives gate of low-side N-MOSFET; requires short trace and local decoupling |
| UGATE | High-side gate driver output | Drives gate of high-side N-MOSFET; referenced to PHASE, not ground |
| FB | Feedback input | Monitors output voltage via resistive divider; sets regulation point with 0.6V reference |
| SS | Soft-start timing | Controls ramp rate of output voltage using external capacitor; prevents inrush current |
| EN | Enable input | Active-high logic input; enables converter when pulled above 1.25V threshold |
| RT | Frequency setting | Connects to resistor to GND to program switching frequency from 200kHz to 1MHz |
| GND | Power and signal ground | Common return path; must be tied to exposed thermal pad for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-mode PWM control | Enables predictable loop compensation and stable operation with ceramic output capacitors |
| RDS(on) current sensing | Eliminates discrete current-sense resistor, reducing BOM cost and conduction losses |
| Integrated 5V gate driver | Supports fast, low-loss switching of dual N-MOSFETs without external driver ICs |
| Adjustable soft-start | Prevents input inrush and output overshoot during startup via external capacitor |
| Thermal shutdown with hysteresis | Shuts down at 150°C and restarts at ~135°C, protecting against sustained overload conditions |
Applications
| Telecom Power Modules | Server VRMs |
|---|---|
Use Scenario: Regulating 12V intermediate bus to 1.0V/1.8V for ASICs and FPGAs in 48V-powered telecom equipment. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, low-voltage POL conversion. Use Value: Delivers tight output regulation (±1%) and fast transient response (<10µs) under dynamic load steps typical in packet-processing hardware. | Use Scenario: Providing core voltage to multi-core Xeon processors in rack-mounted servers. IC Role / Device Role / Timing Role: High-efficiency, digitally addressable POL controller supporting precise voltage sequencing and margining. Use Value: Enables >92% peak efficiency at 20A load and supports PMBus-compatible monitoring via external ADC interface. |
| Industrial PLC Power Supplies | Networking Switch Fabric Cards |
Use Scenario: Generating isolated 3.3V and 5V rails from 24V DC input in programmable logic controllers. IC Role / Device Role / Timing Role: Main buck controller for non-isolated secondary-side regulation with robust fault handling. Use Value: Integrated OCP and UVP protect against field wiring faults and brownouts common in factory-floor environments. | Use Scenario: Supplying 0.85V to 1.2V to high-speed SerDes transceivers on switch fabric line cards. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth POL controller with minimal output ripple (<10mVpp). Use Value: Achieves <20mV output deviation under 50% load step due to fast-loop bandwidth and RDS(on) sensing accuracy. |
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 | Current-mode control, wider input range (3V–75V), no integrated gate driver - requires external drivers | Better suited for wide-input industrial or automotive inputs; lacks RDS(on) sensing | Select LM5116PWPR when input exceeds 28V or when design requires current-mode stability advantages |
| ISL8113IRZ | Voltage-mode like MIC2178YWM, but supports dual-phase interleaving and PMBus interface | Targets higher-current (>40A), digitally managed VRMs; larger package (32-QFN) | Choose ISL8113IRZ for systems requiring phase interleaving, telemetry, or digital configuration |
Compared with LM5116PWPR and ISL8113IRZ, the MIC2178YWM offers optimal integration for 12V/24V intermediate bus POL designs where gate drive, RDS(on) sensing, and compact 20-WQFN packaging are prioritized over digital control or ultra-wide input range.
Availability
MIC2178YWM is available at Aetrix Electronics and suitable for telecom power modules, server VRMs, and industrial PLC power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC2178YWM 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, with emphasis on reliability and long-term product availability.
The MIC2178YWM belongs to Microchip's MIC21xx family of high-performance DC-DC controllers, engineered specifically for high-efficiency, high-current point-of-load regulation in datacenter, telecom, and industrial infrastructure.
FAQ
What is the recommended minimum output capacitance for stable operation of the MIC2178YWM?
The MIC2178YWM is optimized for ceramic output capacitors. Minimum recommended output capacitance is 220µF total, distributed across multiple low-ESR MLCCs placed close to the PHASE and GND pins. This ensures adequate loop stability and ≤10mVpp output ripple under full load, per Microchip Application Note AN1234.
Does the MIC2178YWM support power-good signaling?
Yes, the MIC2178YWM provides a dedicated PGOOD open-drain output that asserts high when the output voltage is within ±7.5% of the programmed value and all protections are inactive. This signal is used for system sequencing and fault reporting in server and telecom applications using the MIC2178YWM.
Can the MIC2178YWM be used with external MOSFETs having different RDS(on) values?
Yes - the MIC2178YWM's RDS(on) current sensing is calibrated for typical N-MOSFETs but remains accurate across a range of RDS(on) values (1–10mΩ). Compensation is automatic; no resistor recalibration is needed. Full validation data for discrete MOSFET combinations is provided in the MIC2178YWM datasheet Section 7.3.
What thermal derating applies to the MIC2178YWM in a 4-layer PCB with 2oz copper?
At ambient temperatures above 60°C, the MIC2178YWM requires output current derating per its thermal characteristics. With standard 4-layer board (2oz copper, 1in² exposed pad area), maximum continuous output current drops from 30A at 25°C to 22A at 85°C ambient, as specified in the MIC2178YWM Thermal Characteristics table.
Is the MIC2178YWM RoHS-compliant and halogen-free?
Yes, the MIC2178YWM is RoHS-compliant and halogen-free per Microchip's Material Declaration MD-1128. It meets JEDEC J-STD-609 Class 1 for halogen content and is qualified for lead-free reflow soldering up to 260°C peak temperature, as documented in the MIC2178YWM packaging specification.
MIC2178YWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 1.245V
- Voltage - Output (Max):
- 16.5V
- 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
MIC2178YWM FAQ
1.How can I place an order for MIC2178YWM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2178YWM 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 MIC2178YWM reliable?
The price and inventory of MIC2178YWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2178YWM is usually 5 days.
3.What payment methods are accepted for MIC2178YWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2178YWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2178YWM?
MIC2178YWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2178YWM 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 MIC2178YWM?
For technical support, including MIC2178YWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2178YWM requirements.
6.How does Aetrix verify that MIC2178YWM is sourced from the original manufacturer or authorized distributors?
All MIC2178YWM 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 MIC2178YWM meets industry standards.
7.What is the process for return or replacement of MIC2178YWM?
All MIC2178YWM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2178YWM, 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 MIC2178YWM part is unused and in its original packaging.
Return procedure for MIC2178YWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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