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Microchip Technology MIC2177-3.3BWM
- Part No.:
- MIC2177-3.3BWM
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2177-3.3BWM.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,639
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Product details
Overview
MIC2177-3.3BWM from Microchip Technology is a 200 kHz synchronous buck (step-down) DC-DC regulator with fixed 3.3 V output, internal 100 mΩ high-side P-channel and low-side N-channel MOSFETs, 4.5–16.5 V input range, and up to 2.5 A continuous output current. It operates in automatic PWM/skip mode for >96% peak efficiency and supports low-dropout operation via 100% duty cycle - used in battery-powered portable electronics requiring stable, compact power conversion.
For engineers reviewing the MIC2177-3.3BWM datasheet, MIC2177-3.3BWM pinout, MIC2177-3.3BWM application, or MIC2177-3.3BWM equivalent, key selection criteria include verified 3.3 V fixed output accuracy (±3.4% over load/temperature), dual-mode efficiency optimization below/above 200 mA, thermal shutdown and UVLO protection, and compatibility with standard 20-pin wide SOIC PCB layouts.
Technical Context
The MIC2177-3.3BWM implements current-mode control with internal current sensing and a 200 kHz preset oscillator synchronized up to 300 kHz via SYNC pin. Its half-H-bridge switch stage integrates anti-shoot-through logic and delivers regulated 3.3 V output using a fixed internal feedback reference of 1.245 V referenced to FB pin.
It features automatic PWM/skip mode transition triggered by load current thresholds (PWM ≥220 mA at 0 V VIN–VOUT; skip ≤300 mA), with dedicated AUTO pin timing (2.2 nF capacitor) and separate current limit thresholds: 4.7 A typical in PWM mode and 600 mA in skip mode - all validated across –40°C to +85°C operating junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3.4% (3.20–3.46 V) over 10 mA–2 A load and 5–16 V input - ensures stable logic supply for 3.3 V microcontrollers and peripherals. |
| Input Voltage Range | 4.5 V to 16.5 V - supports 5 V, 9 V, and 12 V battery or adapter inputs without external pre-regulation. |
| Switching Frequency | 200 kHz preset (±20%), synchronizable to 220–300 kHz - enables predictable EMI filtering and compatible inductor sizing (e.g., 50 μH). |
| Efficiency Modes | PWM mode (>200 mA): up to 96%; Skip mode (<200 mA): optimized light-load efficiency - eliminates audible noise and extends battery runtime. |
| Quiescent Current | 1.0 mA (PWM), 500 μA (skip), <5 μA (shutdown) - critical for always-on or sleep-state power budgeting. |
| Thermal Protection | Thermal shutdown active above +125°C junction; auto-recovery after ~10°C cooldown - prevents permanent damage under sustained overload. |
| Undervoltage Lockout | Turns on at VIN ≥4.35 V (typ.), turns off at VIN ≤4.15 V (typ.) - avoids brown-out instability during battery discharge. |
Pinout & Package
Package: 20-pin wide SOIC (WM), 0.600-inch body width, exposed thermal pad not present, rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9 (VIN) | Unregulated Input Supply | Three parallel pins for high-current input connection; must be tied together and decoupled to PGND with ≥22 μF low-ESR capacitor. |
| 3, 8 (SW) | Half-Bridge Switch Node | Drain outputs of internal P/N MOSFETs; externally joined to inductor and catch diode anode - carries full switching current and voltage swing. |
| 4–7 (PGND) | Power Ground Return | Four dedicated low-impedance ground paths for switch-stage return; must connect to common power ground plane to minimize noise and thermal rise. |
| 10 (OUT) | Output Current Sense | Detects minimum switch current threshold for PWM/skip mode transition; connects directly to output rail, not feedback divider. |
| 11 (AUTO) | Mode Control Timing | Accepts 2.2 nF capacitor to set automatic PWM/skip hysteresis; pulled low forces PWM-only operation for noise-sensitive systems. |
| 12 (FB) | Feedback Input | Internally connected to 3.3 V output; no external resistor divider required - simplifies layout and improves regulation accuracy vs. adjustable versions. |
| 13 (COMP) | Error Amplifier Output | Connects to RC compensation network (e.g., 10 nF + 10 kΩ) to stabilize control loop across line/load transients. |
| 14–17 (SGND) | Signal Ground Reference | Four isolated ground pins for analog/control circuitry; must tie to same ground plane as PGND but with star-point separation to reduce coupling. |
| 18 (SYNC) | External Clock Input | Accepts 220–300 kHz square wave; rising edge resets oscillator - enables multi-regulator synchronization and EMI reduction. |
| 19 (BIAS) | Internal 3.3 V Bias Supply | Provides regulated 3.3 V for internal circuitry; requires 0.01 μF ceramic bypass to SGND - zero external load permitted. |
| 20 (EN) | Enable/Shutdown Control | Active-high logic input; <0.8 V disables regulator, reducing IQ to <5 μA - supports system-level power sequencing and standby modes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Stage | 100 mΩ high-side P-MOSFET + 100 mΩ low-side N-MOSFET at 12 V input - eliminates external diode, reduces conduction loss, and enables >96% efficiency. |
| Automatic Dual-Mode Operation | Seamlessly transitions between PWM and skip mode based on real-time load current - no external control logic needed; preserves efficiency across 10 mA–2.5 A range. |
| 100% Duty Cycle Capability | Maintains regulation down to VIN–VOUT < 1 V - supports low-dropout operation essential for aging Li-ion batteries (e.g., 3.6 V → 3.3 V). |
| Current-Mode Control Architecture | Internal current sensing + corrective ramp - simplifies compensation design, improves line regulation (<0.1%/V), and enables stable operation at >50% duty cycle. |
| Comprehensive Protection Suite | UVLO (4.35 V turn-on), thermal shutdown (+125°C), pulse-by-pulse current limit (4.7 A typ.), and shoot-through prevention - ensures robust field reliability. |
Applications
| Handheld Medical Instruments | Laptop Subsystem Power |
|---|---|
Use Scenario: Portable blood glucose meters and handheld ultrasound probes powered by single-cell Li-ion batteries (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary 3.3 V system rail regulator delivering up to 2.5 A peak during sensor activation and data transmission bursts. Use Value: 100% duty cycle maintains regulation as battery discharges below 3.6 V; skip mode extends battery life during idle periods between measurements. | Use Scenario: USB-C PD-powered laptop subsystems requiring clean, efficient 3.3 V for I/O controllers, eMMC, and PMIC sequencing logic. IC Role / Device Role / Timing Role: Secondary buck converter stepping down 5–12 V adapter or battery voltage to tightly regulated 3.3 V logic supply. Use Value: 200 kHz fixed frequency enables predictable EMI filter design; SYNC pin allows alignment with main CPU VRM clock to suppress beat frequencies. |
| Industrial IoT Edge Sensors | Automotive Telematics Modules |
Use Scenario: Battery- or energy-harvesting–powered wireless sensor nodes deployed in remote industrial environments (–40°C to +85°C). IC Role / Device Role / Timing Role: Main power regulator for ultra-low-power MCU, LoRaWAN radio, and analog front-end - cycling between deep sleep (μA) and active transmit (mA) states. Use Value: 500 μA skip-mode IQ minimizes quiescent drain; thermal shutdown protects against enclosure overheating in sealed enclosures. | Use Scenario: In-vehicle telematics control units (TCUs) powered from 9–16 V automotive battery with cold-crank tolerance. IC Role / Device Role / Timing Role: 3.3 V supply for CAN FD transceivers, GPS receivers, and cellular modems - must survive load-dump and start-stop cycles. Use Value: 4.5–16.5 V input range covers cold-crank dips and load-dump surges; UVLO prevents erratic behavior below 4.35 V during cranking. |
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 | 3.3 V fixed output, 2 A max, 300 kHz switching, no skip mode - uses constant-frequency PWM only. | Lacks automatic light-load efficiency optimization; higher IQ (260 μA) in light load vs. MIC2177-3.3BWM's 500 μA skip mode. | Select when deterministic EMI profile is prioritized over battery runtime; verify thermal margin at 2.5 A due to lower current rating. |
| TPS54202DRCT | Adjustable 0.6–17 V output, 2 A max, 400–2500 kHz programmable frequency, integrated soft-start - no fixed 3.3 V variant. | Requires external feedback resistors and compensation; lacks dedicated AUTO pin for seamless mode transition. | Choose when output voltage flexibility or higher switching frequency is required; accept added BOM cost and layout complexity. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the MIC2177-3.3BWM uniquely combines fixed 3.3 V accuracy, automatic dual-mode efficiency, and 2.5 A capability in a pin-compatible 20-pin SOIC - making it optimal for space-constrained, battery-sensitive designs where minimal external components and guaranteed light-load performance are critical.
Availability
MIC2177-3.3BWM is available at Aetrix Electronics and suitable for handheld medical instruments, laptop subsystem power, industrial IoT edge sensors, and automotive telematics modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MIC2177-3.3BWM 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs, with emphasis on reliability, longevity, and industrial-grade qualification.
The MIC2177 product line delivers high-efficiency synchronous buck regulators for battery-powered and wide-input industrial applications - designed specifically to replace discrete buck solutions with integrated MOSFETs, dual-mode control, and comprehensive protection in compact SOIC packages.
FAQ
What is the output voltage tolerance of the MIC2177-3.3BWM across temperature and load?
The MIC2177-3.3BWM delivers a fixed 3.3 V output with a total tolerance of ±3.4% (3.20 V to 3.46 V) across –40°C to +85°C ambient temperature and 10 mA to 2 A load current, as specified in the Electrical Characteristics table under "Output Voltage" for MIC2177-3.3. This includes initial accuracy, line regulation, load regulation, and thermal drift - verified per DS20006298A-page 3.
Does the MIC2177-3.3BWM require external feedback resistors?
No, the MIC2177-3.3BWM does not require external feedback resistors. It is a fixed-output variant with internal feedback routing - the FB pin is internally connected to the 3.3 V output. Unlike the adjustable MIC2177 [Adj.] version, no resistor divider is needed, simplifying layout and improving regulation stability.
How does the MIC2177-3.3BWM handle low-input-voltage conditions near dropout?
The MIC2177-3.3BWM maintains regulation down to VIN–VOUT < 1 V using 100% duty cycle operation, where the high-side P-MOSFET remains continuously on. As VIN drops, the device sustains 3.3 V output until the dropout voltage (RON × ILOAD) exceeds VIN–3.3 V - enabling reliable operation during Li-ion battery discharge from 3.6 V to 3.3 V.
Can the MIC2177-3.3BWM be synchronized to an external clock?
Yes, the MIC2177-3.3BWM supports external synchronization via the SYNC pin (Pin 18). It accepts TTL/CMOS clock signals from 220 kHz to 300 kHz, with a minimum pulse width of 500 ns. The rising edge resets the internal oscillator - allowing EMI reduction and multi-rail timing coordination without modifying the MIC2177-3.3BWM's core functionality.
What is the maximum continuous output current rating for the MIC2177-3.3BWM?
The MIC2177-3.3BWM is rated for up to 2.5 A continuous output current under typical thermal conditions (20-pin wide SOIC, 4-layer PCB, 2 oz copper). This rating assumes adequate PCB copper area for heat dissipation and operation within the –40°C to +85°C ambient range - confirmed in the General Description and Absolute Maximum Ratings sections of DS20006298A.
MIC2177-3.3BWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- 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
MIC2177-3.3BWM FAQ
1.How can I place an order for MIC2177-3.3BWM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2177-3.3BWM 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 MIC2177-3.3BWM reliable?
The price and inventory of MIC2177-3.3BWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2177-3.3BWM is usually 5 days.
3.What payment methods are accepted for MIC2177-3.3BWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2177-3.3BWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2177-3.3BWM?
MIC2177-3.3BWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2177-3.3BWM 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 MIC2177-3.3BWM?
For technical support, including MIC2177-3.3BWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2177-3.3BWM requirements.
6.How does Aetrix verify that MIC2177-3.3BWM is sourced from the original manufacturer or authorized distributors?
All MIC2177-3.3BWM 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 MIC2177-3.3BWM meets industry standards.
7.What is the process for return or replacement of MIC2177-3.3BWM?
All MIC2177-3.3BWM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2177-3.3BWM, 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 MIC2177-3.3BWM part is unused and in its original packaging.
Return procedure for MIC2177-3.3BWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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