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Microchip Technology MIC2178-3.3YWM-TR
- Part No.:
- MIC2178-3.3YWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2178-3.3YWM-TR.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,223
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Product details
Overview
MIC2178-3.3YWM-TR from Microchip Technology is a 200 kHz synchronous buck (step-down) DC/DC regulator with fixed 3.3V output, internal 100 mΩ P/N-channel MOSFETs, 2.5A continuous output current capability, and dual-mode PWM/skip operation for up to 96% efficiency. It operates from 4.5V–16.5V input and supports low-dropout operation via 100% duty cycle-ideal for battery-powered portable computing and handheld instrumentation.
For engineers reviewing the MIC2178-3.3YWM-TR datasheet, MIC2178-3.3YWM-TR pinout, MIC2178-3.3YWM-TR application, or MIC2178-3.3YWM-TR equivalent, key selection criteria include its fixed 3.3V output accuracy (±3.0% over line/load/temp), skip-mode efficiency below 200 mA, 20-lead wide SOIC thermal performance, and external PWM/skip mode control logic interface.
Technical Context
The MIC2178-3.3YWM-TR 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, both rated at 100 mΩ typical RDS(on) at 12V input, with anti-shoot-through timing and pulse-by-pulse current limiting.
It features a dedicated 3.3V internal bias regulator (BIAS pin), open-drain power-good flag (PWRGD) referenced to FB voltage, and frequency synchronization capability up to 300 kHz via SYNC pin. Shutdown quiescent current is <5 μA, and undervoltage lockout engages at 4.25V (rising) / 4.15V (falling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.0% (3.14–3.46V) across 5–16V input, 10mA–2A load, –40°C to +85°C |
| Max Output Current | 2.5A continuous; current limit set to 4.7A typical in PWM mode, 600mA in skip mode |
| Switching Frequency | Preset 200 kHz (±20%), synchronizable to 220–300 kHz external clock |
| Efficiency | Up to 96% in PWM mode (>200 mA); optimized skip mode for light loads (<200 mA) |
| Quiescent Current | 1.0 mA (PWM), 600 μA (skip), <5 μA (shutdown) |
| Duty Cycle Range | 0–100% - enables true low-dropout operation when VIN–VOUT < 1V |
| Thermal Range | –40°C to +85°C ambient operating temperature; junction limited to +125°C |
Pinout & Package
Package: 20-lead wide SOIC (WM), 0.600" body width, exposed thermal pad (PGND-connected), JEDEC MS-013AC compliant. Thermal resistance θJA = 45°C/W (typical on 2-layer board with 1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9 VIN | Input Power Supply | Three parallel pins for high-current 4.5–16.5V input; must be bypassed to PGND with low-ESR capacitor |
| 3, 8 SW | Switch Node | Half-bridge output connecting to inductor; both pins tied externally to minimize trace inductance |
| 4–7 PGND | Power Ground | Four dedicated low-impedance ground returns for high-current switching paths and thermal dissipation |
| 10 PWM | Mode Control Input | Logic-level select: low = PWM mode, high = skip mode; must not float |
| 11 PWRGD | Open-Drain Flag | Active-low output asserting when FB falls >10% below 1.245V reference; requires external pull-up to VIN |
| 12 FB | Feedback Input | Internal 1.245V reference node; senses output via resistor divider (not used in fixed-output MIC2178-3.3) |
| 13 COMP | Error Amplifier Output | Connect RC network here for loop compensation; sets pole-zero for stability across line/load |
| 14–17 SGND | Signal Ground | Four isolated ground pins for analog/feedback circuitry; tie to PGND at single point under IC |
| 18 SYNC | Frequency Sync Input | Accepts external clock (220–300 kHz); connect to SGND if unused |
| 19 BIAS | Internal 3.3V Supply | Bypass only with 0.01 μF ceramic to SGND; zero external load permitted |
| 20 EN | Enable Input | Active-high logic control; <0.8V disables, >1.6V enables; shutdown draws <5 μA |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-channel MOSFETs | 100 mΩ RDS(on) each at 12V input enables compact 2.5A design without external switches |
| Dual-mode PWM/skip control | Externally selectable mode optimizes efficiency vs. noise trade-off: PWM for >200 mA, skip for <200 mA |
| 100% duty cycle capability | Supports dropout as low as ILOAD × RDS(on) - critical for battery systems near end-of-discharge |
| Current-mode architecture | Provides inherent cycle-by-cycle current limiting and simplifies compensation with single RC network |
| Robust protection suite | Includes UVLO (4.25V/4.15V thresholds), thermal shutdown, and pulse-by-pulse current limit |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Powering core logic and I/O rails in palmtop computers and handheld test equipment operating from Li-ion or multi-cell alkaline packs. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3V at up to 2.5A with dynamic load response and low-noise skip mode during standby. Use Value: Eliminates need for external MOSFETs and reduces BOM count while maintaining >90% efficiency across 10mA–2A load range. | Use Scenario: Supplying microcontroller, ADC, and sensor interfaces in field-deployable handheld instruments with strict battery life requirements. IC Role / Device Role / Timing Role: Fixed-output buck converter enabling rapid system bring-up with no feedback resistor tuning required. Use Value: Fixed 3.3V version guarantees output accuracy without layout sensitivity to FB divider parasitics or bias current errors. |
| Laptop Subsystem Regulation | Cellular Baseband Power |
Use Scenario: Generating auxiliary 3.3V rail for USB controllers, display interfaces, or audio codecs in laptop motherboards. IC Role / Device Role / Timing Role: Secondary regulator synchronized to system clock via SYNC pin to avoid beat frequencies with other switching supplies. Use Value: 200 kHz base frequency and sync capability suppress EMI in dense PCB layouts with multiple SMPS. | Use Scenario: Powering baseband processors and RF front-end ICs in cellular handsets where light-load efficiency and transient response are critical. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in skip mode during sleep/idle states and PWM during active transmission bursts. Use Value: Dual-mode operation extends battery runtime by >25% compared to fixed-frequency PWM-only regulators at sub-200 mA loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC2177-3.3YWM-TR | Auto-switching between PWM and skip modes based on load; no external PWM pin control | Suitable for simpler systems lacking intelligent mode control logic | Select when automatic light-load optimization is preferred over deterministic mode selection |
| TPS54231DR | 3.5–28V input, adjustable output, 2A max, 570 kHz fixed frequency, no skip mode | Higher input range and frequency but lower current rating and no light-load efficiency optimization | Select when higher switching frequency or wider input range outweighs 2.5A requirement and skip-mode benefit |
Compared with MIC2177-3.3YWM-TR, the MIC2178-3.3YWM-TR offers explicit external mode control for deterministic noise/efficiency management; versus TPS54231DR, it delivers 25% higher output current and integrated skip mode for battery-sensitive designs-but requires fixed 3.3V output and lacks adjustable feedback.
Availability
MIC2178-3.3YWM-TR is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, laptop subsystems, and cellular baseband power applications requiring stable component supply and long-term production continuity.
Supply support for MIC2178-3.3YWM-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 leading provider of microcontrollers, analog, FPGA, and power management semiconductors, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and software solutions.
The MIC2178 product line delivers high-efficiency, thermally robust synchronous buck regulators for space-constrained, battery-dependent applications-designed specifically for portable computing, handheld instrumentation, and mobile communications infrastructure.
FAQ
What is the output voltage tolerance of the MIC2178-3.3YWM-TR over temperature and load?
The MIC2178-3.3YWM-TR delivers a fixed 3.3V output with guaranteed tolerance of ±3.0% (3.14V to 3.46V) across –40°C to +85°C ambient temperature, 5V–16V input, and 10mA–2A load. This specification is validated per Microchip DS20006283B electrical characteristics table and includes initial accuracy, line regulation, and load regulation contributions.
Does the MIC2178-3.3YWM-TR require external feedback resistors?
No, the MIC2178-3.3YWM-TR is the fixed-output variant and does not require external feedback resistors. Its internal resistor divider sets the output to 3.3V; the FB pin is internally connected and must not be externally loaded. In contrast, the adjustable MIC2178 [adj.] version requires R1/R2 on FB to set VOUT.
How does the MIC2178-3.3YWM-TR handle thermal overload conditions?
The MIC2178-3.3YWM-TR incorporates thermal shutdown that disables the output when junction temperature exceeds +125°C. After shutdown, the device remains off until junction temperature drops approximately 10°C, then resumes normal operation. This protection is independent of current limit and UVLO, and is verified in functional testing per Microchip's thermal characterization data.
Can the MIC2178-3.3YWM-TR operate with input voltage below 4.5V?
No-the MIC2178-3.3YWM-TR has an undervoltage lockout (UVLO) with a rising threshold of 4.25V and falling threshold of 4.15V. Operation below 4.5V violates the specified operating range; attempting to power the device at 4.2V or lower will prevent startup or cause intermittent dropout. The absolute maximum rating allows only transient 100 ms exposure to ≥4.5V.
What is the purpose of the BIAS pin on the MIC2178-3.3YWM-TR?
The BIAS pin provides access to the MIC2178-3.3YWM-TR's internal 3.3V bias regulator, which powers all internal control circuitry. It must be decoupled with a 0.01 μF ceramic capacitor to SGND. No external load may be connected-applying even 1 mA load will disrupt regulation and degrade performance, as confirmed in Microchip's functional description section 4.6.
MIC2178-3.3YWM-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):
- 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-TR FAQ
1.How can I place an order for MIC2178-3.3YWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2178-3.3YWM-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 MIC2178-3.3YWM-TR reliable?
The price and inventory of MIC2178-3.3YWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2178-3.3YWM-TR is usually 5 days.
3.What payment methods are accepted for MIC2178-3.3YWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2178-3.3YWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2178-3.3YWM-TR?
MIC2178-3.3YWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2178-3.3YWM-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 MIC2178-3.3YWM-TR?
For technical support, including MIC2178-3.3YWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2178-3.3YWM-TR requirements.
6.How does Aetrix verify that MIC2178-3.3YWM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2178-3.3YWM-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 MIC2178-3.3YWM-TR meets industry standards.
7.What is the process for return or replacement of MIC2178-3.3YWM-TR?
All MIC2178-3.3YWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2178-3.3YWM-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 MIC2178-3.3YWM-TR part is unused and in its original packaging.
Return procedure for MIC2178-3.3YWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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