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Microchip Technology MIC2178BWM-TR
- Part No.:
- MIC2178BWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2178BWM-TR.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,338
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Product details
Overview
MIC2178BWM-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 palmtop and laptop supplies.
For engineers reviewing the MIC2178BWM-TR datasheet, MIC2178BWM-TR pinout, MIC2178BWM-TR application, or MIC2178BWM-TR equivalent, key selection criteria include input voltage range, load-current–dependent efficiency modes, internal MOSFET RDS(on), thermal shutdown behavior, and compatibility with external synchronization up to 300 kHz.
Technical Context
The MIC2178BWM-TR implements current-mode control using internal current sensing and a 200 kHz oscillator with slope compensation, 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 with anti-shoot-through logic and 50 ns dead-time control.
Mode selection is externally controlled via the PWM pin: logic low enables fixed-frequency PWM operation; logic high activates self-oscillating skip mode with ±5 mV hysteresis on the feedback comparator. The device supports external frequency synchronization (220–300 kHz) via the SYNC pin and provides an open-drain PWRGD flag referenced to FB voltage with 10% undervoltage threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +4.5V to +16.5V - Supports wide-range industrial and battery inputs including 5V, 9V, and 12V rails. |
| Output Current | Up to 2.5A - Sustained continuous output under thermal limits; pulse current limited to 4.7A (PWM) or 600mA (skip). |
| Switching Frequency | 200 kHz preset, syncable to 220–300 kHz - Enables EMI control and predictable filter design; avoids audible noise bands. |
| Efficiency Modes | PWM mode (>200 mA): up to 96%; Skip mode (<200 mA): optimized light-load efficiency - Reduces quiescent current to 600 µA and eliminates switching losses at low loads. |
| Internal MOSFET RDS(on) | 100 mΩ (P-ch), 100 mΩ (N-ch) at 12V - Enables high-efficiency power conversion without external switches; reduces BOM count and layout area. |
| Feedback Reference | 1.245 V ±25 mV - Precision reference enables accurate adjustable output (e.g., 3.3V or 5.0V) using standard resistor dividers. |
| Shutdown Current | <5 µA - Enables ultra-low-power system sleep states; critical for battery runtime extension in portable devices. |
Pinout & Package
The MIC2178BWM-TR is housed in a 20-lead wide SOIC (WM) package with exposed thermal pad, rated for –40°C to +85°C ambient operation. Power and signal grounds are separated (PGND/SGND) to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9 VIN | Input supply rail | Three parallel pins reduce trace inductance and IR drop; require local 22 µF + 0.1 µF bypass to PGND. |
| 3, 8 SW | Half-bridge switch node | High-current output to inductor; must be routed with short, wide copper; connects internally to both MOSFETs. |
| 4–7 PGND | Power ground return | Four dedicated pins for high-current return path; must connect to single-point PGND plane near input/output caps. |
| 10 PWM | Mode select input | Logic-controlled selection: low = PWM mode; high = skip mode; must not float; driven by MCU GPIO or system controller. |
| 11 PWRGD | Open-drain power-good flag | Active-low when FB falls 10% below 1.245 V; requires external pull-up to VIN; used for system sequencing and fault detection. |
| 12 FB | Feedback input | Connects to resistor divider; 60 nA bias current requires R2 ≤ 100 kΩ to limit voltage error; sets output voltage per VOUT = 1.245 × (1 + R1/R2). |
| 13 COMP | Error amplifier output | Compensation node for loop stability; requires series RC network (e.g., 5 kΩ + 4.7 nF) to place pole-zero pair for phase margin. |
| 14–17 SGND | Signal ground reference | Low-noise reference for FB, COMP, SYNC, BIAS; must tie to PGND only at single point under IC body to avoid ground bounce. |
| 18 SYNC | External clock input | Accepts 220–300 kHz square wave; rising edge synchronizes oscillator; leave tied to SGND if unused. |
| 19 BIAS | Internal 3.3V bias supply | Provides regulated 3.3V for internal circuitry; decoupled with 0.01 µF ceramic cap to SGND; no external load permitted. |
| 20 EN | Enable control input | Logic-high enables regulation; logic-low forces shutdown with <5 µA quiescent current; must not float; compatible with 3.3V/5V logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode efficiency optimization | Automatically adapts between fixed-frequency PWM (high-load) and variable-frequency skip mode (light-load), reducing quiescent current to 600 µA without sacrificing regulation accuracy. |
| 100% duty cycle operation | Enables dropout as low as ILOAD × RDS(on); maintains regulation even when VIN − VOUT < 1V, critical for battery end-of-discharge conditions. |
| Integrated current-mode control | Eliminates need for external current-sense resistor; internal slope compensation ensures stability at >50% duty cycle; simplifies compensation with single RC network on COMP. |
| Robust protection suite | Includes pulse-by-pulse current limiting (4.7A PWM / 600mA skip), thermal shutdown (>125°C), UVLO (4.25V turn-on / 4.15V turn-off), and shoot-through prevention with 50 ns dead time. |
| Low-noise system integration | SYNC pin allows EMI reduction via clock alignment; PWRGD flag enables precise power sequencing; separate PGND/SGND pins suppress switching noise in feedback and control paths. |
Applications
| Palmtop Computers | Laptop Computers |
|---|---|
Use Scenario: Regulating main 3.3V or 5.0V core supply from a 7.4V Li-ion battery pack during active and standby modes. IC Role / Device Role / Timing Role: Primary synchronous buck converter providing regulated output with dynamic mode switching based on CPU activity. Use Value: Extends battery life by reducing quiescent current to 600 µA in skip mode during idle, while maintaining fast transient response and <1% output ripple in PWM mode under load. | Use Scenario: Generating 3.3V auxiliary rail for USB controllers, audio codecs, and embedded controllers from a 12V or 16.5V adapter input. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with thermal shutdown and PWRGD monitoring for system-level power management. Use Value: Delivers 2.5A continuous output with 96% peak efficiency and 100% duty cycle support, enabling reliable operation across full input range and temperature extremes (–40°C to +85°C). |
| Cellular Telephones | Battery Chargers |
Use Scenario: Supplying clean 3.3V power to RF transceivers and baseband processors during burst transmission and deep-sleep cycles. IC Role / Device Role / Timing Role: Low-noise, dynamically mode-switched DC/DC converter synchronized to system clock to minimize interference with sensitive analog sections. Use Value: Skip mode eliminates switching noise during receive/sleep, while PWM mode ensures tight regulation and fast load-step response during transmit bursts. | Use Scenario: Providing constant-voltage output for lithium-ion charging circuits powered from 9–16.5V wall adapters or automotive sources. IC Role / Device Role / Timing Role: Input-stage buck regulator conditioning unregulated adapter output before linear charger IC or battery protection circuitry. Use Value: Handles wide input range and high peak currents; UVLO prevents erratic startup at low adapter voltages; thermal shutdown protects against overtemperature during prolonged charging. |
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 | Auto-selects PWM/skip mode internally based on load; no external PWM pin control; identical pinout and electrical specs otherwise. | Suitable where system lacks GPIO for mode control but requires same efficiency profile; removes need for external logic interface. | Select MIC2177YWM when automatic mode transition is preferred over firmware-controlled selection. |
| TPS54227PWPR | 2.95–6.0V input range; 2A output; 700 kHz switching; integrated FETs; no skip mode; uses voltage-mode control. | Targeted at lower-input, higher-frequency applications (e.g., 5V rail); lacks light-load efficiency optimization and 100% duty cycle. | Choose TPS54227PWPR only for narrow-input designs requiring higher switching frequency and simpler compensation. |
Compared with MIC2178BWM-TR, MIC2177YWM offers identical performance with automatic mode selection-ideal for cost-sensitive or GPIO-constrained designs-while TPS54227PWPR trades wide-input flexibility and skip-mode efficiency for higher frequency and smaller external components in 5V-centric systems.
Availability
MIC2178BWM-TR is available at Aetrix Electronics and suitable for palmtop computers, laptop computers, and cellular telephones requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MIC2178BWM-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 devices, and power management ICs, serving automotive, industrial, and consumer markets with high-reliability silicon and design tools.
The MIC2178 product line delivers high-efficiency synchronous buck regulators for battery-powered and wide-input industrial applications, emphasizing dual-mode efficiency, robust protection, and ease of loop compensation.
FAQ
What is the maximum continuous output current supported by the MIC2178BWM-TR?
The MIC2178BWM-TR supports up to 2.5A continuous output current under typical thermal conditions (TA ≤ +85°C, proper PCB layout with thermal pad). Peak pulsed current is limited to 4.7A in PWM mode and 600mA in skip mode. Actual achievable current depends on input voltage, output voltage, ambient temperature, and heatsinking - refer to Figure 2-7 and thermal derating curves in DS20006283B for junction temperature validation.
How does the MIC2178BWM-TR handle low-dropout operation?
The MIC2178BWM-TR achieves low-dropout operation via 100% duty cycle capability: when VIN − VOUT drops below ~1V, the P-channel MOSFET remains continuously on, regulating output down to a dropout voltage equal to ILOAD × RDS(on) (≈250 mV at 2.5A). This allows stable regulation even near battery end-of-discharge, unlike fixed-duty-cycle or diode-based buck topologies.
Can the MIC2178BWM-TR be synchronized to an external clock, and what are the timing requirements?
Yes, the MIC2178BWM-TR accepts external synchronization on the SYNC pin across 220–300 kHz. The signal must be a logic-level square wave with minimum pulse width ≥500 ns and threshold of 0.8–2.2 V. The rising edge terminates the current switching cycle and resets the oscillator. If unused, SYNC must be tied to SGND - leaving it floating may cause erratic operation.
What is the function of the BIAS pin on the MIC2178BWM-TR, and how should it be decoupled?
The BIAS pin provides the internal 3.3V bias supply for control circuitry and must be decoupled with a 0.01 µF ceramic capacitor to SGND. No external load is permitted - connecting any load will disrupt internal regulation and cause malfunction. This pin is not an output supply; its sole purpose is internal power routing and noise isolation.
How does the PWRGD flag on the MIC2178BWM-TR indicate output status, and what is its threshold?
The PWRGD pin is an open-drain output that pulls low when the FB voltage falls 10% below the 1.245 V reference (i.e., <1.13 V for adjustable versions). For MIC2178BWM-TR configured as 5.0V output, this corresponds to VOUT < 4.54 V. It sinks up to 0.5 mA and requires an external pull-up resistor to VIN; it is used for system power sequencing and fault reporting.
MIC2178BWM-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:
- 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
MIC2178BWM-TR FAQ
1.How can I place an order for MIC2178BWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2178BWM-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 MIC2178BWM-TR reliable?
The price and inventory of MIC2178BWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2178BWM-TR is usually 5 days.
3.What payment methods are accepted for MIC2178BWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2178BWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2178BWM-TR?
MIC2178BWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2178BWM-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 MIC2178BWM-TR?
For technical support, including MIC2178BWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2178BWM-TR requirements.
6.How does Aetrix verify that MIC2178BWM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2178BWM-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 MIC2178BWM-TR meets industry standards.
7.What is the process for return or replacement of MIC2178BWM-TR?
All MIC2178BWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2178BWM-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 MIC2178BWM-TR part is unused and in its original packaging.
Return procedure for MIC2178BWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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