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Microchip Technology MIC2177-3.3BWM-TR
- Part No.:
- MIC2177-3.3BWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2177-3.3BWM-TR.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,532
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Product details
Overview
MIC2177-3.3BWM-TR from Microchip Technology is a 2.5A synchronous buck (step-down) DC-DC regulator with fixed 3.3V output, operating from 4.5V to 16.5V input. It integrates 100 mΩ high-side P-channel and low-side N-channel MOSFETs, uses current-mode control, and delivers up to 96% efficiency in PWM mode for battery-powered portable instrumentation.
For engineers reviewing the MIC2177-3.3BWM-TR datasheet, MIC2177-3.3BWM-TR pinout, MIC2177-3.3BWM-TR application, or MIC2177-3.3BWM-TR equivalent, key selection criteria include its 200 kHz preset switching frequency, automatic PWM/skip mode transition at ~200 mA load, 100% duty cycle capability for low-dropout operation, and 20-pin wide SOIC thermal performance up to +85°C ambient.
Technical Context
The MIC2177-3.3BWM-TR implements current-mode control with internal current sensing, enabling simplified loop compensation and superior line regulation. Its dual-mode operation-PWM above ~220 mA and skip mode below ~300 mA-is managed by dedicated comparators monitoring FB voltage and inductor current thresholds.
It features an integrated 3.3V bias regulator (BIAS pin), programmable frequency synchronization (SYNC pin, 220–300 kHz), and robust protection including undervoltage lockout (4.25 V turn-on, 4.15 V turn-off), thermal shutdown, and pulse-by-pulse current limiting (4.7 A typical in PWM mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over 5–16V input and 10 mA–2A load; enables direct replacement of linear regulators in 3.3V rail generation. |
| Input Voltage Range | 4.5V to 16.5V; supports 5V, 9V, and 12V battery or adapter inputs without external pre-regulation. |
| Max Output Current | 2.5A continuous; sufficient for powering microcontrollers, FPGAs, and interface ICs in portable systems. |
| Switching Frequency | 200 kHz preset (±20%); balances EMI, inductor size, and efficiency-no external timing components required. |
| Efficiency | Up to 96% in PWM mode at full load; >85% down to 10 mA in skip mode, extending battery runtime in low-power states. |
| Quiescent Current | 500 μA in skip mode; <5 μA in shutdown; critical for always-on subsystems with long standby duration. |
| Duty Cycle Range | 0–100%; maintains regulation even when VIN − VOUT < 1V, enabling operation near battery end-of-discharge. |
Pinout & Package
Package: 20-pin wide SOIC (WM), exposed pad not present; thermal resistance θJA = 45°C/W, 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 reduce trace resistance and power loss; must be connected together and bypassed to PGND with ≥22 μF low-ESR capacitor. |
| 3, 8 - SW | Half-bridge switch node | High-side P-MOS and low-side N-MOS drain connection; requires short, low-inductance routing to inductor and diode. |
| 4–7 - PGND | Power ground return | Four dedicated pins minimize ground bounce during high di/dt switching; must connect to a solid copper plane under the IC. |
| 10 - OUT | Output voltage sense | Direct connection to output rail improves load regulation accuracy by compensating for PCB trace IR drop. |
| 11 - AUTO | Mode selection control | 2.2 nF capacitor sets automatic PWM/skip transition; grounding forces PWM-only operation for noise-sensitive applications. |
| 12 - FB | Feedback input | Internally tied to 3.3V output; no external divider needed-simplifies layout and eliminates resistor tolerance error. |
| 13 - COMP | Error amplifier output | Connect RC network (e.g., 10 nF + 10 kΩ) to stabilize control loop; location critical for noise immunity. |
| 14–17 - SGND | Signal ground reference | Four pins isolate analog control circuitry from power switching noise; tie to same ground plane as PGND at single point. |
| 18 - SYNC | External clock input | Accepts 220–300 kHz square wave; synchronizes multiple converters to suppress beat frequencies in multi-rail systems. |
| 19 - BIAS | Internal 3.3V supply output | Provides regulated bias for internal circuitry; requires 0.01 μF ceramic cap to SGND-no external loading permitted. |
| 20 - EN | Enable logic input | Active-high (1.6 V threshold); pull low to reduce quiescent current to <5 μA-enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM/Skip Mode Transition | Eliminates manual mode selection; dynamically optimizes efficiency across 10 mA–2.5A load range without firmware or external logic. |
| Integrated 100 mΩ Power MOSFETs | Reduces external component count and board area; eliminates gate driver design while maintaining >95% peak efficiency at 12V input. |
| Current-Mode Control Architecture | Enables stable operation with minimal compensation (single RC on COMP); provides fast transient response and inherent cycle-by-cycle current limiting. |
| 100% Duty Cycle Capability | Supports dropout as low as ILOAD × RDS(on); sustains 3.3V output down to VIN = 3.4V at 1A, extending usable battery voltage range. |
| Thermal Shutdown with Hysteresis | Shuts down at +125°C junction; restarts only after cooling ~10°C-prevents thermal runaway during sustained overload or poor heatsinking. |
Applications
| Handheld Test Instruments | Laptop Subsystem Power |
|---|---|
Use Scenario: Portable multimeter or oscilloscope module powered by two Li-ion cells (6–8.4V nominal) requiring clean, regulated 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 2.5A peak to mixed-signal SoC and precision analog front-end. Use Value: Skip mode extends battery life during display/idle states; 100% duty cycle maintains regulation as cells discharge to 3.4V per cell. | Use Scenario: Secondary 3.3V rail in ultrabook for USB-C PD controller, touchpad ASIC, and embedded security module. IC Role / Device Role / Timing Role: High-efficiency buck converter synchronized via SYNC to main CPU VRM clock to minimize EMI coupling. Use Value: 200 kHz fixed frequency simplifies filter design; BIAS pin powers internal logic without loading main 3.3V rail. |
| Battery-Powered Wireless Sensors | Industrial Data Acquisition Node |
Use Scenario: LoRaWAN sensor node using single 3.6V Li-SOCl₂ primary cell with 10-year shelf life and intermittent 2.5A transmit bursts. IC Role / Device Role / Timing Role: Input-stage regulator enabling deep sleep (<5 μA shutdown) and rapid wake-up to full 3.3V/2.5A output. Use Value: <5 μA shutdown current preserves battery capacity over decade-long deployments; EN pin supports precise MCU-controlled power gating. | Use Scenario: DIN-rail mounted PLC I/O module powered from 12–24V DC industrial bus, requiring robust 3.3V supply for ARM Cortex-M7 and isolated CAN transceivers. IC Role / Device Role / Timing Role: Main 3.3V power source with UVLO (4.25V) preventing brownout resets during bus transients. Use Value: Integrated current limit (4.7A) and thermal shutdown protect against short-circuit faults in harsh environments without external protection ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC2177-3.3YM-TR | Same electrical specs; packaged in 20-pin QFN (YM) with exposed thermal pad (θJA = 30°C/W). | Better thermal performance in space-constrained or high-ambient designs; requires reflow-compatible layout. | Select MIC2177-3.3YM-TR for higher power density or >+70°C ambient; retain MIC2177-3.3BWM-TR for through-hole compatibility or legacy SOIC assembly. |
| TPS54202DRCT | 2A max output, 4.5–17V input, 500 kHz switching; no skip mode; requires external MOSFETs. | Higher frequency allows smaller magnetics but lower efficiency at light loads; lacks auto-mode intelligence. | Choose TPS54202DRCT only if 500 kHz EMI profile is mandatory and light-load efficiency is secondary. |
Compared with MIC2177-3.3YM-TR, the MIC2177-3.3BWM-TR trades thermal performance for SOIC manufacturability; compared with TPS54202DRCT, it delivers superior light-load efficiency and integration but at lower switching frequency-making it optimal for battery longevity over ultra-compact size.
Availability
MIC2177-3.3BWM-TR is available at Aetrix Electronics and suitable for handheld instruments, laptop subsystems, battery-powered wireless sensors, and industrial data acquisition nodes requiring stable component supply with guaranteed long-term sourcing.
Supply support for MIC2177-3.3BWM-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 reliability and long product lifecycles.
The MIC2177 family is designed specifically for high-efficiency, battery-operated DC-DC conversion in portable and industrial equipment where automatic mode optimization and low-quiescent-current shutdown are essential.
FAQ
What is the maximum output current capability of the MIC2177-3.3BWM-TR?
The MIC2177-3.3BWM-TR delivers up to 2.5A continuous output current under typical conditions (TA ≤ +85°C, adequate PCB copper). Its current limit is 4.7A typical in PWM mode, providing headroom for transient loads. Derating applies above +85°C ambient or with insufficient thermal copper; consult the thermal section of DS20006298A for layout guidance specific to the 20-pin wide SOIC package.
Does the MIC2177-3.3BWM-TR require external feedback resistors to set the output voltage?
No, the MIC2177-3.3BWM-TR has a factory-trimmed internal feedback network for a fixed 3.3V output. Pin 12 (FB) is internally connected to the output, eliminating the need for external resistors-reducing BOM cost, layout area, and potential errors from resistor tolerance or placement.
How does the MIC2177-3.3BWM-TR transition between PWM and skip mode?
The MIC2177-3.3BWM-TR automatically transitions based on load: it enters skip mode below ~200–300 mA and returns to PWM mode above ~220–420 mA, with hysteresis preventing oscillation. This is controlled by internal comparators monitoring FB voltage and inductor current, using the AUTO pin's 2.2 nF timing capacitor-no external logic or configuration is required.
Can the MIC2177-3.3BWM-TR operate with input voltage below 4.5V?
No-the MIC2177-3.3BWM-TR incorporates undervoltage lockout (UVLO) that disables operation when VIN falls below 4.25V (typical turn-on threshold) and remains off until VIN rises above 4.35V. This prevents erratic behavior or insufficient gate drive to the internal MOSFETs, ensuring reliable startup and shutdown sequencing.
What is the purpose of the BIAS pin on the MIC2177-3.3BWM-TR?
The BIAS pin on the MIC2177-3.3BWM-TR outputs a regulated 3.3V supply used internally to power control circuitry. It must be decoupled with a 0.01 μF ceramic capacitor to SGND and must not drive any external load-doing so will degrade regulation and may cause instability. It is not intended as a general-purpose LDO output.
MIC2177-3.3BWM-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:
- 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-TR FAQ
1.How can I place an order for MIC2177-3.3BWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2177-3.3BWM-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 MIC2177-3.3BWM-TR reliable?
The price and inventory of MIC2177-3.3BWM-TR 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-TR is usually 5 days.
3.What payment methods are accepted for MIC2177-3.3BWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2177-3.3BWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2177-3.3BWM-TR?
MIC2177-3.3BWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2177-3.3BWM-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 MIC2177-3.3BWM-TR?
For technical support, including MIC2177-3.3BWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2177-3.3BWM-TR requirements.
6.How does Aetrix verify that MIC2177-3.3BWM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2177-3.3BWM-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 MIC2177-3.3BWM-TR meets industry standards.
7.What is the process for return or replacement of MIC2177-3.3BWM-TR?
All MIC2177-3.3BWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2177-3.3BWM-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 MIC2177-3.3BWM-TR part is unused and in its original packaging.
Return procedure for MIC2177-3.3BWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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