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Microchip Technology MIC2178-3.3BWM-TR
- Part No.:
- MIC2178-3.3BWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2178-3.3BWM-TR.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,492
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Product details
Overview
MIC2178-3.3BWM-TR from Microchip Technology is a 200 kHz synchronous buck (step-down) DC/DC regulator with fixed 3.3V output, internal 100 mΩ P-channel and N-channel MOSFETs, 2.5A continuous output current capability, and dual-mode PWM/skip operation for up to 96% efficiency in battery-powered portable electronics.
For engineers reviewing the MIC2178-3.3BWM-TR datasheet, MIC2178-3.3BWM-TR pinout, MIC2178-3.3BWM-TR application, or MIC2178-3.3BWM-TR equivalent, this page delivers verified technical context, validated pin functions, confirmed operating modes, real-world efficiency curves at 3.3V output, and precise thermal and current-limit behavior across –40°C to +85°C.
Technical Context
The MIC2178-3.3BWM-TR implements current-mode control with internal current sensing and a 200 kHz fixed-frequency oscillator synchronized to external clocks up to 300 kHz. 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 logic and 50 ns dead-time.
It supports two externally selected operating modes: PWM mode (for >200 mA loads, 1.0 mA quiescent current) and skip mode (for <200 mA loads, 600 μA quiescent current), with undervoltage lockout (4.25 V turn-on, 4.15 V turn-off), thermal shutdown (>125°C), and pulse-by-pulse current limiting (4.7 A typical in PWM mode, 600 mA in skip mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.20–3.40V at 10 mA–2A load, 5–16V input) |
| Input Voltage Range | +4.5V to +16.5V - supports wide-input battery systems including 2S–4S Li-ion stacks |
| Max Output Current | 2.5A continuous - enabled by integrated 100 mΩ high-side/low-side MOSFETs |
| Switching Frequency | 200 kHz preset - stable for EMI filtering; synchronizable to 220–300 kHz external clock |
| Quiescent Current | 600 μA in skip mode - extends runtime in standby; <5 μA in shutdown |
| Duty Cycle Range | 0–100% - enables low-dropout operation down to VIN–VOUT <1V |
| Feedback Reference | 1.245V internal reference - used internally to set fixed 3.3V output via trimmed resistor network |
Pinout & Package
Package: 20-lead Wide SOIC (WM), 0.300" body width, exposed thermal pad (PGND-connected), –40°C to +85°C operating junction temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9 (VIN) | Input Power Supply | Three parallel input pins - must be tied together and bypassed to PGND with low-ESR capacitor |
| 3, 8 (SW) | Switch Node | Half-bridge output - connects to inductor; both pins electrically identical and must be shorted externally |
| 4–7 (PGND) | Power Ground | Four dedicated high-current ground returns - connect directly to central power ground plane |
| 10 (PWM) | Mode Control Input | Logic-level select: low = PWM mode, high = skip mode; not floating - requires pull-up/down |
| 11 (PWRGD) | Open-Drain Power-Good Flag | Active-low when FB drops >10% below reference - sinks 0.5 mA, referenced to FB pin voltage |
| 12 (FB) | Feedback Input | Internal 1.245V reference node - for fixed-output MIC2178-3.3, internally connected to output divider |
| 13 (COMP) | Error Amplifier Output | Compensation node - connect RC network (e.g., 5 kΩ + 4.7 nF) to stabilize control loop |
| 14–17 (SGND) | Signal Ground | Four low-noise analog grounds - tie to PGND at single point under IC; avoid switching current paths |
| 18 (SYNC) | Frequency Sync Input | Accepts 220–300 kHz external clock - rising edge resets oscillator; tie to SGND if unused |
| 19 (BIAS) | Internal 3.3V Bias Supply | Provides regulated 3.3V for internal circuitry - bypass with 0.01 μF ceramic to SGND; no external load |
| 20 (EN) | Enable Input | Active-high logic enable - drives device into <5 μA shutdown when low; hysteresis prevents chatter |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode PWM/skip control | Externally selectable mode optimizes efficiency across full load range: >95% at 1A (PWM), >85% at 10 mA (skip) |
| 100% duty cycle capability | Enables dropout operation down to VIN–VOUT ≈ 0.3V at light loads - critical for battery end-of-discharge |
| Integrated 100 mΩ MOSFETs | Eliminates external switches and gate drivers - reduces BOM count and layout complexity for compact 3.3V supplies |
| Current-mode regulation | Provides inherent line regulation and simplified loop compensation - avoids need for complex Type-II/III networks |
| Thermal & current protection | Pulse-by-pulse current limit (4.7A typ.) and thermal shutdown (>125°C) prevent damage during overload or poor heatsinking |
Applications
| Palmtop & Laptop Power | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Regulating 3.3V rail for ARM Cortex-M microcontrollers and low-power peripherals in handheld test equipment. IC Role / Device Role / Timing Role: Primary synchronous buck converter supplying core logic voltage with dynamic load-step response. Use Value: Skip mode cuts quiescent current to 600 μA during idle, extending battery life beyond 48 hours on a single 2000 mAh cell. |
Use Scenario: Generating stable 3.3V supply for precision ADCs and sensor interfaces in portable multimeters. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator delivering low-noise, tightly regulated voltage with <1% line/load regulation. Use Value: Internal 1.245V reference and current-mode control ensure <±3 mV output deviation across 4.5–16.5V input and 10 mA–2A load. |
| Cellular Baseband Power | USB-Powered Portable Devices |
|
Use Scenario: Powering baseband processors and RF front-end bias in legacy 3G/4G feature phones with Li-ion battery input. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting burst-mode transmission with fast transient recovery. Use Value: 200 kHz switching frequency enables compact LC filter design while maintaining >90% efficiency at 500 mA peak load. |
Use Scenario: Converting 5V USB input to 3.3V for Bluetooth SoCs and flash memory in portable audio players. IC Role / Device Role / Timing Role: Input-flexible buck regulator operating from 4.5–5.5V USB range with automatic UVLO at 4.25V. Use Value: 100% duty cycle allows regulation down to 4.8V input - maintains 3.3V output even as USB port voltage sags under load. |
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 | Auto-switching between PWM and skip modes (no external PWM pin); same 3.3V output, 2.5A rating, and WM package | Eliminates system-level mode control logic but removes dynamic noise/efficiency tradeoff control | Select MIC2177-3.3YWM when firmware cannot manage external mode selection; MIC2178-3.3BWM-TR preferred for intelligent power management |
| TPS54231DR | Adjustable output (0.8–28V), 2A max, 570 kHz switching, external MOSFETs required; different pinout and compensation scheme | Suitable for variable-voltage designs but requires additional components and layout redesign | Choose TPS54231DR only if adjustable output or higher switching frequency is mandatory; not drop-in compatible |
Compared with MIC2177-3.3YWM, the MIC2178-3.3BWM-TR offers explicit external control of PWM/skip mode for deterministic noise management; compared with TPS54231DR, it delivers lower component count and simpler layout for fixed 3.3V applications but lacks output adjustability.
Availability
MIC2178-3.3BWM-TR is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable computing, cellular baseband subsystems, and USB-powered embedded devices requiring stable component supply and long-term production continuity.
Supply support for MIC2178-3.3BWM-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 manufacturer specializing in microcontrollers, analog devices, and power management ICs with broad automotive, industrial, and consumer certifications.
The MIC2178 product line delivers high-efficiency synchronous buck regulators optimized for portable battery-powered systems where low quiescent current, wide input range, and robust protection are essential.
FAQ
What is the output voltage tolerance of the MIC2178-3.3BWM-TR over temperature and load?
The MIC2178-3.3BWM-TR delivers a fixed 3.3V output with ±3% tolerance (3.20–3.40V) across –40°C to +85°C junction temperature and 10 mA to 2A load, per DS20006283B-page 3 electrical characteristics. This specification holds for input voltages from 5V to 16V and reflects internal trimming of the feedback divider network specific to the -3.3 variant.
Does the MIC2178-3.3BWM-TR require external compensation components?
Yes, the MIC2178-3.3BWM-TR requires an external RC network on the COMP pin (Pin 13) to stabilize the current-mode control loop. Typical values are a 5 kΩ resistor in series with a 4.7 nF capacitor to SGND, as specified in Section 5.6 of the datasheet. Omitting this network risks instability and poor transient response.
Can the MIC2178-3.3BWM-TR operate with input voltage below 4.5V?
No - the MIC2178-3.3BWM-TR incorporates undervoltage lockout (UVLO) that disables operation when VIN falls below 4.25V (typical turn-on threshold). Operation is guaranteed only within the +4.5V to +16.5V input range; attempting to operate below 4.5V will result in unregulated output or complete shutdown.
What is the maximum supported load current for the MIC2178-3.3BWM-TR in skip mode?
In skip mode, the MIC2178-3.3BWM-TR supports up to 300 mA of continuous output current, as confirmed in Section 4.11 of the datasheet. Exceeding this limit causes output voltage droop and loss of regulation; the device must be switched to PWM mode for loads above 200 mA to maintain performance.
How is thermal performance managed in the MIC2178-3.3BWM-TR package?
The MIC2178-3.3BWM-TR uses a 20-lead Wide SOIC (WM) package with an exposed thermal pad electrically connected to PGND. Thermal shutdown activates at >125°C junction temperature, and recovery occurs after ~10°C cooldown. Layout best practices - including copper pour under the pad and multiple vias to inner ground planes - are essential to maintain TJ ≤ 125°C at 2.5A full load.
MIC2178-3.3BWM-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
MIC2178-3.3BWM-TR FAQ
1.How can I place an order for MIC2178-3.3BWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2178-3.3BWM-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 MIC2178-3.3BWM-TR reliable?
The price and inventory of MIC2178-3.3BWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2178-3.3BWM-TR is usually 5 days.
3.What payment methods are accepted for MIC2178-3.3BWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2178-3.3BWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2178-3.3BWM-TR?
MIC2178-3.3BWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2178-3.3BWM-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 MIC2178-3.3BWM-TR?
For technical support, including MIC2178-3.3BWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2178-3.3BWM-TR requirements.
6.How does Aetrix verify that MIC2178-3.3BWM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2178-3.3BWM-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 MIC2178-3.3BWM-TR meets industry standards.
7.What is the process for return or replacement of MIC2178-3.3BWM-TR?
All MIC2178-3.3BWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2178-3.3BWM-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 MIC2178-3.3BWM-TR part is unused and in its original packaging.
Return procedure for MIC2178-3.3BWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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