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Microchip Technology MIC2178-5.0YWM-TR
- Part No.:
- MIC2178-5.0YWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2178-5.0YWM-TR.pdf
- Description:
- IC REG BUCK 5V 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,778
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Product details
Overview
MIC2178-5.0YWM-TR from Microchip Technology is a 200 kHz synchronous buck (step-down) DC/DC regulator with fixed 5.0 V output, internal 100 mΩ high-side P-channel and low-side N-channel MOSFETs, 2.5 A continuous output current capability, and dual-mode PWM/skip operation for up to 96% efficiency in battery-powered systems such as laptop and cellular telephone power supplies.
For engineers reviewing the MIC2178-5.0YWM-TR datasheet, MIC2178-5.0YWM-TR pinout, MIC2178-5.0YWM-TR application, or MIC2178-5.0YWM-TR equivalent, this page delivers verified technical context, validated pin functions, confirmed operating modes (PWM/skip), exact output voltage tolerance (±3%), and real-world thermal and current-limit behavior across –40°C to +85°C.
Technical Context
The MIC2178-5.0YWM-TR implements current-mode control with internal current sensing, enabling simplified loop compensation and superior line regulation. Its half-H-bridge switch stage uses anti-shoot-through logic and features 100% duty cycle support for low-dropout operation down to VIN – VOUT < 1 V.
Mode selection is externally controlled via the PWM pin (logic low = PWM mode; logic high = skip mode), with distinct current limits: 4.7 A typical in PWM mode and 600 mA in skip mode. The 200 kHz oscillator is internally preset and synchronizable to 220–300 kHz external clocks via the SYNC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±3% (4.85–5.15 V at ILOAD = 0 A; 4.85–5.15 V over 6–16 V input and 10 mA–2 A load) |
| Input Voltage Range | +4.5 V to +16.5 V - supports wide-input battery and adapter sources; UVLO engages below 4.2 V (lower threshold) |
| Max Output Current | 2.5 A continuous - enabled by internal 100 mΩ high-side and 110 mΩ low-side MOSFETs at 12 V input |
| Switching Frequency | 200 kHz preset - stable switching with minimal EMI; synchronizable to 220–300 kHz for noise-sensitive designs |
| Quiescent Current | 600 µA in skip mode, 1.0 mA in PWM mode, <5 µA in shutdown - critical for standby power in portable devices |
| Current Limit | 4.7 A typical in PWM mode, 600 mA in skip mode - pulse-by-pulse protection prevents MOSFET overstress |
| Thermal Shutdown | Activates above +125°C junction temperature; auto-recovery after ~10°C cooldown - ensures safe operation under overload |
Pinout & Package
Packaged in a 20-lead wide SOIC (WM) with exposed thermal pad, the MIC2178-5.0YWM-TR supports high-power dissipation in compact industrial and portable layouts. Pin assignments are validated per DS20006283B-page 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9 (VIN) | Input Supply Rail | Three parallel inputs for low-impedance connection to 4.5–16.5 V source; requires local bypass to PGND |
| 3, 8 (SW) | Half-Bridge Switch Node | Internal P/N-MOSFET output; must be shorted externally; drives inductor high-side node |
| 4–7 (PGND) | Power Ground Return | Four dedicated pins for high-current return path; connect all to central low-impedance ground point |
| 10 (PWM) | Mode Control Input | Logic-level select: low = PWM mode (>200 mA loads); high = skip mode (<200 mA loads); no floating allowed |
| 11 (PWRGD) | Open-Drain Power-Good Flag | Active-low when FB drops 10% below 1.245 V reference; sinks 0.5 mA; requires external pull-up to VIN |
| 12 (FB) | Feedback Input | Monitors regulated output via resistor divider; 60 nA bias current; used for PWRGD threshold detection |
| 13 (COMP) | Error Amplifier Output | Connect RC network (e.g., 5–20 kΩ + 4.7–10 nF) for loop compensation; sets stability and transient response |
| 14–17 (SGND) | Signal Ground Reference | Four low-noise analog grounds; tie to PGND only at single point under IC to avoid ground bounce |
| 18 (SYNC) | External Clock Input | Accepts 220–300 kHz square wave; rising edge resets oscillator; connect to SGND if unused |
| 19 (BIAS) | Internal 3.3 V Bias Supply | Provides internal circuit power; decouple with 0.01 µF ceramic to SGND; zero external load permitted |
| 20 (EN) | Enable Control Input | Logic high enables regulation; logic low disables output and reduces IQ to <5 µA; no floating allowed |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode PWM/skip operation | Enables >96% peak efficiency across full load range: PWM for >200 mA (low-noise, constant frequency), skip for <200 mA (ultra-low IQ) |
| 100% duty cycle capability | Supports dropout operation down to VIN – VOUT < 1 V - essential for maintaining 5.0 V output during battery sag (e.g., Li-ion discharge) |
| Integrated high- and low-side MOSFETs | Eliminates external switches and gate drivers; 100 mΩ high-side / 110 mΩ low-side at 12 V enables 2.5 A without heatsink in WM package |
| Current-mode control with internal sensing | Removes need for external current-sense resistor; simplifies compensation and improves line regulation vs. voltage-mode |
| Robust protection suite | Includes pulse-by-pulse current limit, thermal shutdown, undervoltage lockout (4.25 V turn-on), and open-drain PWRGD fault signaling |
Applications
| Laptop Computer Core Power | Cellular Telephone Baseband Supply |
|---|---|
|
Use Scenario: Powers 5 V I/O rails and peripheral interfaces in ultraportable laptops with dynamic load profiles (10 mA–2.2 A). IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering fixed 5.0 V from 7–16 V adapter or multi-cell battery. Use Value: Dual-mode operation extends battery runtime by reducing quiescent current to 600 µA during light-load sleep states while sustaining 2.5 A burst capability. |
Use Scenario: Supplies 5 V to baseband processors and RF front-end modules in 4G/5G handsets with aggressive power cycling. IC Role / Device Role / Timing Role: Step-down regulator with fast transient response and low-noise PWM mode for digital core logic. Use Value: Skip mode minimizes conducted EMI during idle periods; PWRGD flag enables system-level power sequencing and fault recovery. |
| Handheld Instrument Main Supply | Battery Charger Auxiliary Rail |
|
Use Scenario: Provides clean, regulated 5.0 V to microcontroller, display, and sensor subsystems in portable test equipment. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter operating from 2S–4S Li-ion packs (7–16.8 V). Use Value: 100% duty cycle maintains regulation even as battery discharges to 5.2 V, avoiding brownout during critical measurements. |
Use Scenario: Generates isolated 5 V auxiliary supply for charger controller ICs and status LEDs in multi-bay smart chargers. IC Role / Device Role / Timing Role: Fixed-output buck regulator powering non-isolated control logic alongside primary charging circuitry. Use Value: Internal BIAS rail powers internal circuits without loading main output; EN pin enables synchronized startup/shutdown with charge state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC2177-5.0YWM-TR | Auto-selects PWM/skip mode based on load current; no external PWM pin control required | Simpler system integration where intelligent mode switching is not available; lacks manual mode override | Select when firmware-controlled mode selection is impractical; trade-off is loss of deterministic noise control |
| TPS54202DRCT | 4.5–17 V input, 5 V fixed output, 2 A max, 500 kHz switching, integrated soft-start, no skip mode | Higher switching frequency enables smaller magnetics; higher IQ (19 µA shutdown) and lower current rating | Prefer for space-constrained designs needing faster transient response; avoid for ultra-low-IQ battery hold-up |
Compared with MIC2178-5.0YWM-TR, MIC2177-5.0YWM-TR removes external mode control complexity but sacrifices noise predictability, while TPS54202DRCT trades peak efficiency and deep-sleep IQ for higher frequency and integrated soft-start - making MIC2178-5.0YWM-TR optimal for battery life-critical 2.5 A applications requiring both low-noise PWM and ultra-low-IQ skip operation.
Availability
MIC2178-5.0YWM-TR is available at Aetrix Electronics and suitable for laptop computer power supplies, cellular telephone baseband systems, and handheld instrument main rails requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MIC2178-5.0YWM-TR 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, interface, 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 wide-input industrial applications, designed specifically to maximize runtime and simplify layout in space- and thermal-constrained portable electronics.
FAQ
What is the output voltage tolerance of the MIC2178-5.0YWM-TR across temperature and load?
The MIC2178-5.0YWM-TR delivers a fixed 5.0 V output with ±3% tolerance (4.85–5.15 V) at ILOAD = 0 A, and maintains 4.85–5.15 V over 6–16 V input and 10 mA–2 A load at +25°C. Over –40°C to +85°C, the worst-case deviation remains within ±3.5% due to internal 1.245 V reference drift and feedback bias current effects.
How does the MIC2178-5.0YWM-TR handle low-input-voltage conditions near dropout?
The MIC2178-5.0YWM-TR supports 100% duty cycle operation, allowing regulation down to VIN – VOUT < 1 V. When input sags (e.g., Li-ion at 5.2 V), the high-side P-channel remains continuously on until dropout voltage (RON × ILOAD) exceeds VIN – VOUT - preserving 5.0 V output longer than conventional buck regulators.
Can the MIC2178-5.0YWM-TR be synchronized to an external clock, and what are the timing requirements?
Yes - the MIC2178-5.0YWM-TR accepts external synchronization via the SYNC pin over 220–300 kHz. It triggers on the rising edge of a logic-level signal with minimum pulse width of 500 ns and threshold of 0.8–2.2 V. If unused, SYNC must be tied to SGND to prevent noise-induced instability.
What is the purpose of the BIAS pin on the MIC2178-5.0YWM-TR, and how should it be decoupled?
The BIAS pin provides the internal 3.3 V bias supply for control circuitry. It must be decoupled with a 0.01 µF ceramic capacitor to SGND, placed adjacent to the pin. No external load may be connected - the pin is not rated for current sourcing and loading degrades regulation accuracy and thermal performance of the MIC2178-5.0YWM-TR.
How does the PWRGD flag on the MIC2178-5.0YWM-TR indicate output health, and what is its threshold?
The PWRGD pin is an open-drain error flag that pulls low when the FB voltage falls 10% below the 1.245 V internal reference - corresponding to ~4.54 V at the 5.0 V output. It sinks up to 0.5 mA and requires an external pull-up to VIN. This enables precise power-good monitoring for system reset and sequencing in the MIC2178-5.0YWM-TR design.
MIC2178-5.0YWM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 5V
- 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
MIC2178-5.0YWM-TR FAQ
1.How can I place an order for MIC2178-5.0YWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2178-5.0YWM-TR 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 MIC2178-5.0YWM-TR reliable?
The price and inventory of MIC2178-5.0YWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2178-5.0YWM-TR is usually 5 days.
3.What payment methods are accepted for MIC2178-5.0YWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2178-5.0YWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2178-5.0YWM-TR?
MIC2178-5.0YWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2178-5.0YWM-TR 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 MIC2178-5.0YWM-TR?
For technical support, including MIC2178-5.0YWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2178-5.0YWM-TR requirements.
6.How does Aetrix verify that MIC2178-5.0YWM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2178-5.0YWM-TR 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 MIC2178-5.0YWM-TR meets industry standards.
7.What is the process for return or replacement of MIC2178-5.0YWM-TR?
All MIC2178-5.0YWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2178-5.0YWM-TR, 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 MIC2178-5.0YWM-TR part is unused and in its original packaging.
Return procedure for MIC2178-5.0YWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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