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Microchip Technology MIC2178YWM-TR
- Part No.:
- MIC2178YWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2178YWM-TR.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
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Product details
Overview
MIC2178YWM-TR from Microchip Technology is a 200 kHz synchronous buck (step-down) DC/DC regulator with internal 100 mΩ P-channel and N-channel MOSFETs, supporting 4.5V–16.5V input and delivering up to 2.5A output current. It features dual-mode operation (PWM for >200 mA, skip mode for <200 mA), 100% duty cycle capability for low-dropout operation, and integrated current-mode control for stable regulation in battery-powered portable electronics.
For engineers reviewing the MIC2178YWM-TR datasheet, MIC2178YWM-TR pinout, MIC2178YWM-TR application, or MIC2178YWM-TR equivalent, key selection criteria include its 2.5A output capability, 200 kHz fixed switching frequency with external synchronization support up to 300 kHz, low quiescent current (600 μA in skip mode), thermal shutdown, and undervoltage lockout - all critical for high-efficiency, space-constrained power designs.
Technical Context
The MIC2178YWM-TR implements current-mode control with internal current sensing, enabling simplified loop compensation and superior line regulation. Its half-H-bridge switch stage integrates a P-channel high-side and N-channel low-side MOSFET, protected by anti-shoot-through circuitry and pulse-by-pulse current limiting (4.7 A typical in PWM mode).
It supports externally selected operating modes via the PWM pin: logic low enables constant-frequency PWM mode; logic high activates self-oscillating skip mode optimized for light-load efficiency. The 3.3 V internal bias regulator (BIAS pin) powers internal circuitry and requires local 0.01 μF decoupling, while the open-drain PWRGD flag asserts low when FB falls 10% below 1.245 V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +4.5 V to +16.5 V - supports wide-range battery and industrial supply inputs without external pre-regulation. |
| Output Current | Up to 2.5 A - sufficient for core logic rails in laptops, palmtops, and handheld instruments. |
| Switching Frequency | 200 kHz preset, synchronizable to 220–300 kHz - enables EMI control and predictable filter design. |
| Efficiency Modes | PWM mode (>200 mA, up to 96%) and skip mode (<200 mA) - dynamically optimizes efficiency across load range. |
| Quiescent Current | 600 μA in skip mode, <5 μA in shutdown - extends battery life in standby and ultra-light-load conditions. |
| Feedback Reference | 1.245 V ±25 mV - enables precise adjustable output (e.g., 3.3 V or 5.0 V) using external resistor divider. |
| Thermal Protection | Thermal shutdown at junction >125 °C with ~10 °C hysteresis - prevents permanent damage under overload or poor heatsinking. |
Pinout & Package
Package: 20-lead wide SOIC (WM), -40°C to +85°C operating temperature range, exposed thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9 (VIN) | Input Supply Rail | Three parallel VIN connections reduce trace resistance and improve high-current path integrity; must be bypassed to PGND. |
| 3, 8 (SW) | Half-Bridge Switch Node | Internal P/N-MOSFET output node; both pins must be shorted externally to minimize inductance and voltage overshoot. |
| 4–7 (PGND) | Power Ground Return | Four dedicated PGND pins handle high di/dt return currents; require low-impedance connection to central ground plane. |
| 10 (PWM) | Mode Control Input | Logic-level select: low = PWM mode (constant frequency), high = skip mode (variable frequency, low-noise light load). |
| 11 (PWRGD) | Open-Drain Power Good Flag | Asserts low when FB drops 10% below 1.245 V; requires external pull-up to VIN or system rail for system monitoring. |
| 12 (FB) | Feedback Input | Connects to resistive divider; 60 nA bias current necessitates R2 ≤ 100 kΩ to limit voltage error. |
| 13 (COMP) | Error Amplifier Output | Connects to RC compensation network (e.g., 5–20 kΩ + 4.7–10 nF) to stabilize control loop with current-mode architecture. |
| 14–17 (SGND) | Signal Ground Reference | Four SGND pins isolate analog/feedback paths from noisy power return; tie to PGND only at single point under IC. |
| 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 regulated 3.3 V for internal circuits; requires 0.01 μF ceramic capacitor to SGND; no external loading permitted. |
| 20 (EN) | Enable Control Input | Logic high enables regulation; logic low reduces quiescent current to <5 μA; must not float - use pull-down if uncontrolled. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables low-dropout regulation (e.g., 5 V out from 5.4 V in), maintaining regulation even when VIN − VOUT < 1 V. |
| Integrated Dual MOSFETs | 100 mΩ high-side P-MOSFET and 100 mΩ low-side N-MOSFET at 12 V VIN eliminate external switches and reduce BOM count. |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting, fast transient response, and simplified compensation vs. voltage-mode topologies. |
| Programmable Operating Mode | External PWM pin selection allows system-level optimization: PWM for noise-sensitive loads, skip mode for battery runtime extension. |
| Robust Protection Suite | Includes undervoltage lockout (4.25 V turn-on, 4.15 V turn-off), thermal shutdown, and pulse-by-pulse current limit (4.7 A typ.) |
Applications
| Laptop Core Power Supply | Palmtop Computer System Rail |
|---|---|
Use Scenario: Regulating 3.3 V or 5.0 V from a 7–16.5 V Li-ion battery pack in thin-profile notebook platforms. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 2.5 A to CPU I/O, memory, or chipset rails. Use Value: 96% peak efficiency and 600 μA skip-mode quiescent current extend battery runtime during idle and light-load states. |
Use Scenario: Generating stable 3.3 V for ARM-based application processors and peripherals in handheld PDAs. IC Role / Device Role / Timing Role: High-efficiency step-down converter with programmable PWM/skip mode for adaptive power management. Use Value: Dual-mode operation reduces audible noise and EMI during low-power UI interaction while maintaining fast transient response. |
| Cellular Phone Baseband Power | Handheld Instrument Main Supply |
Use Scenario: Providing clean, regulated 3.3 V to baseband SoCs and RF front-end ICs in 3G/4G mobile handsets. IC Role / Device Role / Timing Role: Synchronous buck regulator with PWRGD flag for system power sequencing and fault detection. Use Value: Open-drain PWRGD output interfaces directly with processor reset controllers to ensure safe boot and brownout recovery. |
Use Scenario: Delivering 5.0 V at up to 2.5 A to mixed-signal data acquisition circuits in portable test equipment. IC Role / Device Role / Timing Role: Primary DC/DC converter with thermal shutdown and current limit protecting against sensor overloads or probe shorts. Use Value: 100% duty cycle operation sustains regulation during battery voltage sag, ensuring uninterrupted measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC2177YWM-TR | Auto-selects PWM/skip mode internally based on load; no external PWM pin control; identical pinout and specs otherwise. | Suitable where system MCU lacks GPIO for mode control; less flexible for noise-critical dynamic mode switching. | Select MIC2177YWM-TR if automatic light-load efficiency optimization is preferred over firmware-controlled mode selection. |
| TPS54227DRCT | 3.5 V–18 V input, 2 A output, 500 kHz switching, integrated FETs, but no skip mode; uses voltage-mode control. | Better suited for compact, high-frequency designs where size outweighs light-load efficiency; lacks PWRGD and SYNC. | Choose TPS54227DRCT when board space is constrained and 500 kHz operation simplifies magnetics, accepting higher light-load IQ. |
Compared with MIC2178YWM-TR, MIC2177YWM-TR removes external mode control complexity but sacrifices real-time noise/efficiency tradeoff flexibility, while TPS54227DRCT offers higher frequency and smaller passives at the cost of skip-mode efficiency and comprehensive protection signaling.
Availability
MIC2178YWM-TR is available at Aetrix Electronics and suitable for laptop computers, cellular telephones, and handheld instruments requiring stable component supply, long-term production continuity, and automotive-grade reliability screening.
Supply support for MIC2178YWM-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with emphasis on embedded control and energy-efficient solutions.
The MIC2178YWM-TR belongs to Microchip's high-efficiency synchronous buck regulator product line, designed specifically for battery-powered portable electronics demanding wide-input-voltage operation, dual-mode efficiency, and robust protection.
FAQ
What is the maximum continuous output current supported by the MIC2178YWM-TR?
The MIC2178YWM-TR delivers up to 2.5 A continuous output current under typical thermal conditions (TA = +25°C, proper PCB layout). This rating assumes adequate copper area for heat dissipation and operation within the –40°C to +85°C ambient range. At elevated temperatures or with limited airflow, derating applies per the thermal resistance (θJA) specified in the datasheet. The MIC2178YWM-TR maintains this capability across its full 4.5 V–16.5 V input range when used with appropriate external components.
How does the MIC2178YWM-TR achieve low quiescent current in skip mode?
The MIC2178YWM-TR achieves 600 μA typical quiescent current in skip mode by disabling high-frequency clock generation and reducing internal bias currents while retaining essential monitoring functions like feedback comparison and PWRGD assertion. Unlike PWM mode, skip mode operates as a self-oscillating topology with intermittent switching cycles, minimizing gate drive losses and dynamic power consumption. This behavior is confirmed in DS20006283B, Table 1, where ISS = 600 μA is measured under skip-mode conditions with output not switching.
Can the MIC2178YWM-TR operate with 100% duty cycle, and what design conditions enable it?
Yes, the MIC2178YWM-TR supports 100% duty cycle operation to maintain regulation under low dropout conditions (e.g., 5.0 V output from 5.4 V input). This is enabled when the feedback voltage (FB) falls below 1.0 V, causing the control logic to hold the high-side P-MOSFET continuously on. The device sustains regulation until the dropout voltage - defined as RDS(on) × ILOAD - exceeds VIN − VOUT. Verified in DS20006283B, Table 1, DMAX = 100% is guaranteed across temperature and input voltage ranges.
What is the function of the BIAS pin on the MIC2178YWM-TR, and how must it be used?
The BIAS pin on the MIC2178YWM-TR provides the regulated 3.3 V internal supply voltage 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 to BIAS - it is not rated to source current beyond internal needs. Connecting a load risks regulation failure or thermal overstress. This requirement is explicitly stated in Section 4.6 and Figure 5-1 of DS20006283B.
Does the MIC2178YWM-TR require an external Schottky diode, and why?
Yes, the MIC2178YWM-TR requires an external Schottky diode (e.g., MBRS130L or MBRS140) despite its synchronous rectification. During the 50 ns dead time between high-side and low-side MOSFET switching, inductor current flows through the diode. In skip mode, the low-side N-MOSFET remains off, making the diode the sole freewheeling path. A Schottky diode with <100 ns reverse recovery and ≥VIN reverse voltage rating minimizes conduction loss and prevents excessive voltage spikes, as detailed in Section 5.5 of DS20006283B.
MIC2178YWM-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:
- 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-TR FAQ
1.How can I place an order for MIC2178YWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2178YWM-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 MIC2178YWM-TR reliable?
The price and inventory of MIC2178YWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2178YWM-TR is usually 5 days.
3.What payment methods are accepted for MIC2178YWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2178YWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2178YWM-TR?
MIC2178YWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2178YWM-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 MIC2178YWM-TR?
For technical support, including MIC2178YWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2178YWM-TR requirements.
6.How does Aetrix verify that MIC2178YWM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2178YWM-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 MIC2178YWM-TR meets industry standards.
7.What is the process for return or replacement of MIC2178YWM-TR?
All MIC2178YWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2178YWM-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 MIC2178YWM-TR part is unused and in its original packaging.
Return procedure for MIC2178YWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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