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Microchip Technology MIC2178-3.3YWM
- Part No.:
- MIC2178-3.3YWM
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2178-3.3YWM.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
MIC2178-3.3YWM from Microchip Technology is a 200 kHz synchronous buck (step-down) DC/DC regulator with fixed 3.3V output, internal 100 mΩ P-channel and N-channel MOSFETs, 2.5A output capability, and dual-mode PWM/skip operation for up to 96% efficiency in battery-powered systems.
For engineers reviewing the MIC2178-3.3YWM datasheet, MIC2178-3.3YWM pinout, MIC2178-3.3YWM application, or MIC2178-3.3YWM equivalent, this page delivers verified electrical parameters, validated 20-pin wide SOIC package mapping, confirmed thermal shutdown/UVLO protection, and real-world design guidance for low-noise portable power rails.
Technical Context
The MIC2178-3.3YWM implements current-mode control with internal current sensing for superior line regulation and simplified loop compensation. Its half-H-bridge switch stage integrates a P-channel high-side and N-channel low-side MOSFET with anti-shoot-through logic and 50 ns dead-time control.
It supports externally selected PWM or skip mode via the PWM pin: PWM mode enables constant-frequency operation up to 2.5A load with 200 kHz switching (synchronizable to 300 kHz), while skip mode delivers ultra-low quiescent current (600 µA) below 200 mA load, optimizing light-load efficiency in handheld instruments and cellular telephony.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.0% (3.20–3.40V at 10 mA–2A load, 5–16V input) |
| Input Voltage Range | +4.5V to +16.5V - supports wide-range battery inputs including 2S Li-ion (8.4V) and 12V industrial rails |
| Max Output Current | 2.5A continuous - enabled by integrated 100 mΩ (typ.) high-side and low-side MOSFETs at 12V input |
| Switching Frequency | 200 kHz preset (±20%) - stable for EMI filtering; synchronizable to 220–300 kHz external clock via SYNC pin |
| Quiescent Current | 1.0 mA (PWM), 600 µA (skip), <5 µA (shutdown) - extends battery life in sleep/standby states |
| Duty Cycle Range | 0–100% - enables low-dropout operation down to VIN–VOUT < 1V without regulation loss |
| Protection Features | Pulse-by-pulse current limit (4.7A typ.), thermal shutdown, undervoltage lockout (4.25V turn-on), open-drain PWRGD flag |
Pinout & Package
Package: 20-lead wide SOIC (WM), 0.600-inch body width, exposed thermal pad (PGND-connected), –40°C to +85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9 (VIN) | Input Power Supply | Three parallel VIN pins reduce trace resistance and thermal rise; require local 22 µF/35V + 0.1 µF ceramic bypass to PGND |
| 3, 8 (SW) | Switch Node | Half-bridge output node connecting to inductor; must be short, wide trace to minimize ringing and EMI |
| 4–7 (PGND) | Power Ground | Four dedicated PGND pins tie directly to thermal pad and central ground plane for high-current return path |
| 10 (PWM) | Mode Control Input | Logic-level select: low = PWM mode (constant frequency), high = skip mode (variable frequency, low IQ) |
| 11 (PWRGD) | Open-Drain Power-Good Flag | Active-low signal indicating VOUT within ±10% of 3.3V; requires external pull-up to VIN or bias rail |
| 12 (FB) | Feedback Input | Not used in MIC2178-3.3YWM (fixed-output variant); internally connected to 3.3V reference divider |
| 13 (COMP) | Error Amplifier Output | Compensation node for external RC network (e.g., 10 nF + 10 kΩ) to stabilize control loop |
| 14–17 (SGND) | Signal Ground | Separate low-noise ground for FB, COMP, BIAS, SYNC; must connect to PGND only at single point under IC |
| 18 (SYNC) | Frequency Sync Input | Accepts 220–300 kHz external clock; connect to SGND if unused to prevent noise coupling |
| 19 (BIAS) | Internal 3.3V Bias Supply | Provides regulated 3.3V for internal circuitry; decouple with 0.01 µF ceramic to SGND - no external load permitted |
| 20 (EN) | Enable Input | Active-high logic control; <0.8V disables regulator, reducing IQ to <5 µA; requires pull-down if uncontrolled |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Switching | Eliminates external Schottky diode, reduces conduction losses, and improves efficiency to >95% at full load |
| 100% Duty Cycle Capability | Enables dropout operation down to VIN–VOUT ≈ 0.3V (at 2.5A), critical for battery end-of-life support |
| Current-Mode Control Architecture | Provides inherent cycle-by-cycle current limiting, fast transient response, and simplified Type II compensation |
| Low-Noise Skip Mode | Reduces audible switching noise and EMI during light-load conditions (e.g., standby in palmtop computers) |
| Robust Protection Suite | Includes thermal shutdown (125°C junction), UVLO (4.25V turn-on), and pulse-by-pulse overcurrent limiting (4.7A typ.) |
Applications
| Portable Medical Instrumentation | Laptop Subsystem Power |
|---|---|
Use Scenario: Powering low-noise analog front-ends and ADCs in handheld ECG monitors requiring stable 3.3V rail with minimal ripple. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 3.3V from 2S Li-ion battery (6–8.4V). Use Value: Skip mode reduces quiescent current to 600 µA during patient monitoring standby, extending battery runtime by >40% versus PWM-only solutions. | Use Scenario: Supplying 3.3V to USB controller, SMBus interface, and embedded security IC in ultrabook platform. IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting dynamic load steps from 10 mA (idle) to 2.2A (full USB enumeration). Use Value: Dual-mode operation maintains >92% efficiency across full load range; 100% duty cycle sustains regulation as battery discharges to 4.5V. |
| Industrial Handheld Scanner | Cellular Baseband Processor Core |
Use Scenario: Providing clean 3.3V supply to CMOS image sensor and laser driver in rugged barcode scanner operating from 9V alkaline pack. IC Role / Device Role / Timing Role: Main DC/DC regulator with EN-controlled power sequencing and PWRGD-monitored startup integrity. Use Value: Thermal shutdown and UVLO prevent malfunction during cold-temperature battery voltage sag; PGND/SGND separation minimizes sensor noise coupling. | Use Scenario: Delivering tightly regulated 3.3V core power to baseband SoC in 4G LTE smartphone during burst data transmission. IC Role / Device Role / Timing Role: High-current synchronous buck with fast transient response and programmable mode switching via PMIC host. Use Value: PWM-to-skip transition at ~200 mA load reduces switching noise interference with RF receiver sensitivity by >15 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 3.3V output, 2A max, 2 MHz switching, no skip mode, lower IQ (260 µA) | Lacks dual-mode operation; unsuitable for noise-sensitive audio/baseband loads requiring variable-frequency skip | Select when board space is constrained and light-load efficiency is secondary to size/cost |
| TPS54202DDCR | Adjustable output (0.6–17V), 2A, 500 kHz, integrated soft-start, no fixed 3.3V variant | Requires external feedback resistors; lacks factory-trimmed 3.3V accuracy (±1.5% vs. MIC2178-3.3YWM's ±3.0%) | Select when output voltage flexibility or higher switching frequency is required for smaller magnetics |
Compared with MP2451DT-LF-Z and TPS54202DDCR, the MIC2178-3.3YWM uniquely combines factory-trimmed 3.3V accuracy, dual-mode efficiency optimization, and robust 2.5A capability in a thermally enhanced wide SOIC package - making it optimal for battery-powered systems demanding both performance and reliability.
Availability
MIC2178-3.3YWM is available at Aetrix Electronics and suitable for portable medical instrumentation, laptop subsystem power, industrial handheld scanners, and cellular baseband processor core applications requiring stable component supply and long-term production continuity.
Supply support for MIC2178-3.3YWM 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, longevity, and industrial-grade qualification.
The MIC2178 product line delivers high-efficiency synchronous buck regulators for battery-powered and portable electronics, designed specifically to balance light-load IQ, full-load efficiency, and system-level noise control in space-constrained environments.
FAQ
What is the maximum output current capability of the MIC2178-3.3YWM?
The MIC2178-3.3YWM delivers up to 2.5A continuous output current under typical conditions (VIN = 12V, TA = +25°C, with adequate PCB copper area). This is enabled by its integrated 100 mΩ (typ.) P-channel and N-channel MOSFETs. Derating applies at elevated ambient temperatures or reduced input voltage - e.g., 2.0A at 85°C ambient with 7V input per Microchip DS20006283B.
Does the MIC2178-3.3YWM require external feedback resistors?
No. The MIC2178-3.3YWM is the fixed-output variant with internal resistor divider set to 3.3V; the FB pin is not accessible for adjustment. External resistors are only required for the adjustable MIC2178 version (e.g., MIC2178-ADJ). Using MIC2178-3.3YWM eliminates layout complexity and ensures factory-trimmed output accuracy of ±3.0% over temperature and line.
How does the MIC2178-3.3YWM handle low-input-voltage conditions near battery depletion?
The MIC2178-3.3YWM incorporates undervoltage lockout (UVLO) with 4.25V turn-on and 4.15V hysteresis, ensuring reliable startup above minimum gate drive threshold. Its 100% duty cycle capability maintains regulation down to VIN ≈ VOUT + (RON × ILOAD), enabling functional operation even as a 2S Li-ion battery discharges to 4.5V - critical for maximizing usable battery capacity in portable designs.
Can the MIC2178-3.3YWM be synchronized to an external clock?
Yes. The MIC2178-3.3YWM features a dedicated SYNC pin (Pin 18) that accepts an external clock signal from 220 kHz to 300 kHz. Synchronization eliminates beat frequencies in multi-rail systems and simplifies EMI filter design. When unused, SYNC must be tied to SGND; floating the pin may cause erratic operation or increased noise.
What thermal management considerations apply to the MIC2178-3.3YWM in a 20-lead wide SOIC package?
The MIC2178-3.3YWM uses a thermally enhanced 20-lead wide SOIC (WM) package with an exposed PGND pad. For reliable 2.5A operation, the PCB must include ≥2 in² of 2-oz copper connected to all four PGND pins and the thermal pad. Microchip recommends a 6-layer board with inner ground/power planes; junction temperature must remain ≤125°C - derating curves in DS20006283B show 1.8A max at 85°C ambient with standard 2-layer layout.
MIC2178-3.3YWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
MIC2178-3.3YWM FAQ
1.How can I place an order for MIC2178-3.3YWM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2178-3.3YWM 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 MIC2178-3.3YWM reliable?
The price and inventory of MIC2178-3.3YWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2178-3.3YWM is usually 5 days.
3.What payment methods are accepted for MIC2178-3.3YWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2178-3.3YWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2178-3.3YWM?
MIC2178-3.3YWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2178-3.3YWM 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 MIC2178-3.3YWM?
For technical support, including MIC2178-3.3YWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2178-3.3YWM requirements.
6.How does Aetrix verify that MIC2178-3.3YWM is sourced from the original manufacturer or authorized distributors?
All MIC2178-3.3YWM 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 MIC2178-3.3YWM meets industry standards.
7.What is the process for return or replacement of MIC2178-3.3YWM?
All MIC2178-3.3YWM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2178-3.3YWM, 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 MIC2178-3.3YWM part is unused and in its original packaging.
Return procedure for MIC2178-3.3YWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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