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Microchip Technology MIC2177BWM-TR
- Part No.:
- MIC2177BWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2177BWM-TR.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,966
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Product details
Overview
MIC2177BWM-TR from Microchip Technology is a 200 kHz synchronous buck (step-down) DC-DC regulator with internal 100 mΩ high-side P-channel and low-side N-channel MOSFETs, delivering up to 2.5 A output current across 4.5V–16.5V input range. It supports dual-mode operation (PWM for >200 mA, skip mode for <200 mA), achieves up to 96% efficiency, and enables low-dropout regulation via 100% duty cycle - used in battery-powered laptop computers and handheld instruments.
For engineers reviewing the MIC2177BWM-TR datasheet, MIC2177BWM-TR pinout, MIC2177BWM-TR application, or MIC2177BWM-TR equivalent, key selection considerations include its 20-pin wide SOIC package, automatic PWM/skip mode transition at ~200 mA load, 1.245 V feedback reference, integrated 3.3 V bias regulator on BIAS pin, and SYNC capability up to 300 kHz.
Technical Context
The MIC2177BWM-TR uses current-mode control with internal current sensing for superior line regulation and simplified loop compensation. Its half-H-bridge switch stage integrates anti-shoot-through logic and delivers 100% duty cycle operation for low-dropout conditions when VIN − VOUT falls below 1 V.
It features automatic mode selection between PWM and skip modes based on real-time inductor current detection (IMIN threshold ~200 mA), with skip-mode hysteresis preventing oscillation between modes near 100–300 mA. The 200 kHz oscillator is internally preset but synchronizable to external clocks from 220 kHz to 300 kHz via the SYNC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 16.5 V - supports wide-range battery and industrial supply rails without external pre-regulation. |
| Output Current | Up to 2.5 A - sustained continuous output with thermal shutdown protection up to +125°C junction temperature. |
| Switching Frequency | 200 kHz (preset), syncable to 220–300 kHz - balances EMI, inductor size, and efficiency in portable designs. |
| Efficiency | Up to 96% - achieved via synchronous rectification and dual-mode operation optimized across load range. |
| Quiescent Current | 500 μA in skip mode, 1.0 mA in PWM mode, <5 μA in shutdown - extends battery life in standby and light-load states. |
| Feedback Reference | 1.245 V ±25 mV - precise internal reference enabling accurate adjustable output voltage setting via resistor divider. |
| On-Resistance | 90–250 mΩ (high-side), 110–250 mΩ (low-side) at 12 V - defines conduction loss and thermal performance under load. |
Pinout & Package
Package: 20-pin wide SOIC (WM), 1.27 mm pitch, exposed thermal pad (not electrically connected), –40°C to +85°C ambient operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 9 - VIN | Unregulated input supply | Power rail for internal regulator, gate drivers, and control circuitry; all three pins must be shorted and bypassed to PGND. |
| 3, 8 - SW | Half-bridge switch node | Drain connection of integrated P-channel and N-channel MOSFETs; requires low-inductance routing to external inductor. |
| 4–7 - PGND | Power ground | High-current return path for switch stage; must connect to a solid ground plane to minimize noise and thermal rise. |
| 10 - OUT | Output current sense input | Detects minimum switch current to trigger PWM-to-skip mode transition; connects directly to output capacitor positive terminal. |
| 11 - AUTO | Automatic mode control | 2.2 nF capacitor sets timing for auto-switching between PWM and skip modes; pulled low forces PWM-only operation. |
| 12 - FB | Feedback input | Inverting input of error amplifier; connects to resistive divider for adjustable output or directly to VOUT for fixed versions. |
| 13 - COMP | Error amplifier output | Connects to RC network (e.g., 5 kΩ + 4.7 nF) to stabilize control loop and ensure phase margin >45°. |
| 14–17 - SGND | Signal ground | Low-noise reference for analog control circuits; must be isolated from PGND except at single-point star ground. |
| 18 - SYNC | External clock input | Accepts TTL/CMOS clock edge (220–300 kHz); unused pin must be tied to SGND to prevent noise coupling. |
| 19 - BIAS | Internal 3.3 V regulator output | Provides bias for internal circuitry; decoupled with 0.01 μF ceramic cap to SGND; no external load permitted. |
| 20 - EN | Enable input | Active-high logic control; <0.8 V disables regulator (quiescent current <5 μA); floating state is undefined and prohibited. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables stable loop compensation with single-pole-zero network on COMP pin and eliminates need for feedforward capacitors. |
| 100% duty cycle operation | Permits regulation down to VIN − VOUT ≈ dropout voltage (RON × ILOAD), supporting ultra-low headroom applications. |
| Integrated 3.3 V bias regulator | Eliminates need for external bias supply; BIAS pin provides clean, regulated power for internal analog blocks only. |
| Pulse-by-pulse current limiting | Protects against short-circuit and overload with 3.8–5.7 A limit in PWM mode and 600 mA in skip mode. |
| Thermal shutdown & UVLO | UVLO activates at VIN <4.25 V (lower threshold) and releases at >4.35 V; thermal shutdown triggers at TJ >+125°C with ~10°C hysteresis. |
Applications
| Laptop Power Management | Handheld Instrument Supply |
|---|---|
Use Scenario: Regulating 5 V or 3.3 V from 7–16 V Li-ion battery pack in ultraportable laptops with dynamic CPU load profiles. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing core system voltage with automatic light-load efficiency optimization. Use Value: Extends runtime by reducing quiescent current to 500 μA in skip mode during idle/sleep states while maintaining fast transient response. |
Use Scenario: Powering mixed-signal data acquisition modules in battery-operated handheld test equipment with variable sensor and display loads. IC Role / Device Role / Timing Role: Step-down converter supplying stable 3.3 V to microcontroller, ADC, and interface ICs with minimal board space. Use Value: Delivers 2.5 A peak current with 100% duty cycle support for brownout resilience during battery sag, avoiding system reset. |
| Battery Charger Auxiliary Rail | Cellular Baseband Power |
Use Scenario: Generating clean 3.3 V auxiliary supply for charger controller ICs and status LEDs in multi-cell Li-ion charging systems. IC Role / Device Role / Timing Role: Secondary buck regulator powered from main DC-DC output or direct battery, synchronized via SYNC pin to reduce EMI. Use Value: Achieves >90% efficiency at 100–500 mA loads and supports frequency synchronization to avoid beat frequencies with primary converter. |
Use Scenario: Providing regulated 1.8 V or 2.8 V to cellular baseband processors in feature phones where input voltage varies from 3.4 V to 4.4 V. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in PWM mode during active call/data transmission and skip mode during idle. Use Value: Maintains tight output regulation (±1.5%) over full temperature range and load step changes, ensuring RF subsystem stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 3.3–18 V input, 2 A output, 500 kHz switching, no skip mode, smaller 8-pin SOIC package | Lacks automatic light-load mode; higher switching frequency reduces inductor size but increases switching loss at high load | Prefer MP2315DJ-LF-Z when board space is critical and light-load efficiency is secondary to cost and footprint. |
| TPS54202DRCT | 4.5–17 V input, 2 A output, 500 kHz, Eco-mode™ (similar to skip), 10-pin WSON package with thermal pad | Includes integrated soft-start and power-good flag; requires external compensation but offers tighter VREF (1.2 V ±1%) | Choose TPS54202DRCT when system-level features like PG and soft-start are required and PCB layout allows WSON thermal management. |
Compared with MP2315DJ-LF-Z and TPS54202DRCT, the MIC2177BWM-TR uniquely combines 2.5 A capability, 200 kHz fixed frequency, robust 100% duty cycle support, and fully integrated bias regulation - making it optimal for thermally constrained, battery-sensitive applications requiring predictable light-load behavior without added components.
Availability
MIC2177BWM-TR is available at Aetrix Electronics and suitable for laptop computers, handheld instruments, battery chargers, and cellular telephones requiring stable component supply with long-term industrial lifecycle support.
Supply support for MIC2177BWM-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 emphasis on reliability, longevity, and automotive/industrial qualification.
The MIC2177BWM-TR belongs to Microchip's high-efficiency synchronous buck regulator product line, designed specifically for battery-powered portable electronics demanding wide input range, low quiescent current, and seamless light-to-heavy load transitions.
FAQ
What is the maximum output current supported by the MIC2177BWM-TR?
The MIC2177BWM-TR supports up to 2.5 A continuous output current under typical thermal conditions (TA = +25°C, adequate PCB copper). Its current limit is 3.8–5.7 A in PWM mode and 600 mA in skip mode. Sustained 2.5 A operation requires proper thermal design - including use of the exposed thermal pad (though not electrically connected), multiple PGND vias, and ≥2 oz copper layers - to maintain junction temperature ≤+125°C. Derating applies above +85°C ambient.
How does the MIC2177BWM-TR automatically switch between PWM and skip modes?
The MIC2177BWM-TR monitors peak inductor current each cycle using internal current sensing. When IL(peak) drops below ~420 mA (corresponding to ~200 mA load at typical VIN–VOUT), the minimum current comparator triggers PWM-to-skip transition. Skip mode begins after the AUTO pin voltage decays below 1.6 V, controlled by a 10 μA current source and 2.2 nF capacitor. The hysteresis between skip-mode max load (300 mA) and PWM min load (~200 mA) prevents mode oscillation.
Can the MIC2177BWM-TR operate with 100% duty cycle, and what does that enable?
Yes, the MIC2177BWM-TR supports 100% duty cycle operation, verified by DMAX = 100% in datasheet Electrical Characteristics. This enables low-dropout regulation when VIN − VOUT falls below 1 V - for example, sustaining 3.3 V output from a sagging 3.6 V Li-ion cell. During 100% duty cycle, the high-side P-channel remains continuously on, and regulation relies on the device's ability to maintain control loop stability and thermal limits under near-zero ripple conditions.
What is the purpose of the BIAS pin on the MIC2177BWM-TR, and how must it be used?
BIAS is the output of an internal 3.3 V regulator that powers the MIC2177BWM-TR's analog control circuitry. It must be decoupled with a 0.01 μF ceramic capacitor to SGND and optionally pulled down with a 10 kΩ resistor to SGND for stability. No external load may be connected to BIAS - doing so risks regulation failure and thermal overstress. The BIAS pin is not intended as a general-purpose supply rail.
Does the MIC2177BWM-TR require external compensation, and what is the recommended network?
Yes, the MIC2177BWM-TR requires external compensation via the COMP pin. A series RC network (e.g., 5 kΩ resistor + 4.7 nF capacitor) is recommended to place a pole-zero pair in the control loop, ensuring ≥45° phase margin and stable regulation across line/load/temperature. The RC values affect crossover frequency and transient response - larger capacitance improves low-frequency gain (line/load regulation), while larger resistance increases mid-band gain for faster recovery.
MIC2177BWM-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
MIC2177BWM-TR FAQ
1.How can I place an order for MIC2177BWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2177BWM-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 MIC2177BWM-TR reliable?
The price and inventory of MIC2177BWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2177BWM-TR is usually 5 days.
3.What payment methods are accepted for MIC2177BWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2177BWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2177BWM-TR?
MIC2177BWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2177BWM-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 MIC2177BWM-TR?
For technical support, including MIC2177BWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2177BWM-TR requirements.
6.How does Aetrix verify that MIC2177BWM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2177BWM-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 MIC2177BWM-TR meets industry standards.
7.What is the process for return or replacement of MIC2177BWM-TR?
All MIC2177BWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2177BWM-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 MIC2177BWM-TR part is unused and in its original packaging.
Return procedure for MIC2177BWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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