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Microchip Technology MIC2177YWM
- Part No.:
- MIC2177YWM
- Manufacturer:
- Microchip Technology
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MIC2177YWM.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,510
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Product details
Overview
MIC2177YWM from Micrel is an adjustable-output, 2.5A synchronous buck regulator IC operating from 4.5V to 16.5V input, featuring internal 100mΩ high-side P-channel and low-side N-channel MOSFETs, 200kHz fixed switching frequency with external synchronization up to 300kHz, and automatic PWM/skip-mode transition for >96% peak efficiency in battery-powered DC-DC conversion.
For engineers reviewing the MIC2177YWM datasheet, MIC2177YWM pinout, MIC2177YWM application, or MIC2177YWM equivalent, key selection criteria include its adjustable output (1.25V–16.5V), 100% duty cycle capability for low-dropout operation, current-mode control architecture, thermal/UVLO/current-limit protection, and Pb-free 20-lead wide SO package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The MIC2177YWM implements current-mode control using internal current sensing and a 1.245V reference, enabling stable loop compensation and superior line regulation. Its dual-mode operation-PWM above ~200mA and skip mode below-is automatically selected via the AUTO pin and a 2.2nF timing capacitor, with hysteresis preventing mode oscillation between 100mA–300mA load currents.
It integrates antishoot-through logic with ~50ns dead time, pulse-by-pulse current limiting (4.7A typical in PWM mode, 600mA in skip mode), and a dedicated 3.3V bias regulator (BIAS pin) for internal circuitry. The SYNC pin accepts external clock signals (220–300kHz) with 500ns minimum pulse width, while EN enables logic-controlled shutdown with <5µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16.5V - supports wide-range industrial and battery inputs including 12V nominal systems. |
| Output Current | Up to 2.5A - sustained load capability enabled by integrated 100mΩ MOSFETs at 12V input. |
| Switching Frequency | 200kHz preset, synchronizable to 220–300kHz - balances EMI, inductor size, and efficiency. |
| Efficiency | Up to 96% - achieved via synchronous rectification and automatic PWM/skip-mode selection. |
| Duty Cycle | 100% maximum - enables low-dropout regulation when VIN − VOUT < 1V. |
| Quiescent Current | 1.0mA (PWM), 500µA (skip), <5µA (shutdown) - critical for battery runtime in portable devices. |
| Reference Voltage | 1.245V ±2.5mV - sets output accuracy for adjustable configurations using external resistor divider. |
Pinout & Package
Package: 20-lead Wide SO (WSOP), Pb-free, –40°C to +85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,9 VIN | Unregulated Input Supply | Power input for controller, switches, and internal regulator; all three pins must be connected to same VIN node with local bypass. |
| 3,8 SW | Switch Node | Half-bridge output connecting to inductor; both pins are internally tied and must be externally shorted. |
| 4–7 PGND | Power Ground | High-current return path for output stage; requires low-impedance connection to ground plane. |
| 10 OUT | Output Sense Input | Senses VOUT to determine minimum switch current threshold for PWM operation; connect directly to output rail. |
| 11 AUTO | Mode Control Timing | Connects to 2.2nF capacitor to enable automatic PWM/skip transition; pulled low forces PWM-only operation. |
| 12 FB | Feedback Input | Inverting input of error amplifier; used with external R1/R2 divider to set adjustable output voltage (VOUT = 1.245V × (1 + R1/R2)). |
| 13 COMP | Compensation Output | Error amplifier output; requires series RC network (e.g., 5kΩ + 4.7nF) for loop stability. |
| 14–17 SGND | Signal Ground | Low-noise reference for control circuitry; must be isolated from PGND traces except at single-point ground plane. |
| 18 SYNC | Frequency Sync Input | Accepts external clock (220–300kHz); rising edge resets oscillator; tie to SGND if unused. |
| 19 BIAS | Bias Regulator Output | Internal 3.3V supply for control logic; decouple with 0.01µF capacitor to SGND; no external load permitted. |
| 20 EN | Enable Input | Active-high logic control; <0.8V disables regulator, >1.6V enables; must not float. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFETs | 100mΩ high-side P-channel and low-side N-channel switches eliminate external FETs and reduce BOM count. |
| Automatic Dual-Mode Operation | Seamlessly transitions between PWM (>200mA) and skip mode (<200mA) without external control, optimizing efficiency across full load range. |
| Current-Mode Control | Enables fast transient response, inherent cycle-by-cycle current limiting, and simplified loop compensation with single-pole-zero network. |
| 100% Duty Cycle Capability | Maintains regulation down to VIN − VOUT ≈ 0V, supporting ultra-low dropout applications like post-regulation of Li-ion battery packs. |
| Comprehensive Protection | Includes pulse-by-pulse current limit, thermal shutdown, undervoltage lockout (4.35V turn-on, 4.15V turn-off), and antishoot-through logic. |
Applications
| Cellular Telephones | Laptop Computers |
|---|---|
Use Scenario: Primary DC-DC conversion from single-cell Li-ion (3.0–4.2V) or multi-cell pack (7.2–12.6V) to core logic voltage (e.g., 1.2V, 1.8V, 3.3V). IC Role / Device Role / Timing Role: Adjustable synchronous buck regulator providing tightly regulated, low-noise power to baseband processor and RF transceiver. Use Value: 96% peak efficiency extends talk time; 100% duty cycle maintains regulation during battery discharge; skip mode minimizes quiescent loss in standby. | Use Scenario: Step-down conversion from 12V or 19V adapter input to 5V, 3.3V, or 1.5V system rails for USB, memory, and chipset supplies. IC Role / Device Role / Timing Role: High-current (2.5A) primary buck converter with integrated MOSFETs and thermal protection for compact motherboard designs. Use Value: Eliminates need for external high-side/low-side FETs and driver; current-mode control ensures stable operation under dynamic CPU load transients. |
| Hand-Held Instruments | Battery Chargers |
Use Scenario: Portable test equipment powered by 4×AA alkaline (6V) or LiPo (7.4V–11.1V) requiring clean, adjustable analog and digital supplies (±5V, 3.3V, 1.2V). IC Role / Device Role / Timing Role: Main power management IC delivering multiple regulated outputs via cascaded buck stages, with low EMI due to fixed 200kHz frequency. Use Value: Synchronous rectification reduces heat generation in sealed enclosures; <5µA shutdown current preserves battery charge during storage. | Use Scenario: On-board charging circuit for 2S or 3S Li-ion battery packs, where buck regulator supplies constant-current/constant-voltage charging voltage (e.g., 8.4V, 12.6V) from 12V/24V source. IC Role / Device Role / Timing Role: Adjustable high-efficiency step-down controller regulating charging voltage with precise feedback and overcurrent protection. Use Value: Internal 4.7A current limit and thermal shutdown prevent damage during fault conditions; 100mΩ MOSFETs minimize power loss at high charge currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | 3A rated, 340kHz fixed frequency, 0.14Ω MOSFETs, no skip mode - uses forced PWM only. | Higher switching frequency allows smaller inductors but increases EMI; lacks automatic light-load efficiency optimization. | Select when board space is constrained and consistent PWM operation is preferred over adaptive efficiency. |
| TPS54202DRCT | 2A rated, 500kHz–2.2MHz adjustable frequency, integrated soft-start, 0.072Ω MOSFETs, Eco-mode™ (similar to skip). | Wider frequency range enables noise-sensitive designs; Eco-mode provides comparable light-load efficiency but different control algorithm. | Select when programmable frequency, soft-start, or tighter output accuracy (±1%) is required over raw current capability. |
Compared with MP2307DN-LF-Z and TPS54202DRCT, the MIC2177YWM offers higher current rating (2.5A vs. 2A/3A), proven 200kHz fixed-frequency stability, and a mature dual-mode architecture optimized for battery life - making it preferable for cost-sensitive, thermally constrained portable applications where predictable EMI and long standby duration are critical.
Availability
MIC2177YWM is available at Aetrix Electronics and suitable for cellular telephones, laptop computers, hand-held instruments, and battery chargers requiring stable component supply with industrial temperature support and Pb-free compliance.
Supply support for MIC2177YWM 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
Micrel, Inc. was a U.S.-based semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC2177 product line was designed for high-efficiency, battery-powered DC-DC conversion in portable electronics, emphasizing integrated power stages, adaptive efficiency modes, and robust protection for unattended operation.
FAQ
What output voltage range does the MIC2177YWM support?
The MIC2177YWM supports an adjustable output voltage range from 1.25V to 16.5V, set by an external resistive divider connected to the FB pin. Its internal 1.245V reference voltage enables precise configuration (e.g., 3.3V, 5.0V, or custom values) with typical accuracy of ±2.5mV over temperature. This flexibility makes MIC2177YWM suitable for diverse system rails without requiring multiple fixed-output variants.
How does the MIC2177YWM switch between PWM and skip mode?
The MIC2177YWM automatically switches between PWM and skip mode based on load current using the AUTO pin and an external 2.2nF capacitor. When load drops below ~200mA, the minimum current comparator detects peak inductor current <420mA and triggers skip mode; above ~300mA, the low-output comparator pulls AUTO low to force PWM. This hysteresis prevents mode toggling and ensures stable operation across the full load range.
What is the purpose of the BIAS pin on the MIC2177YWM?
The BIAS pin on the MIC2177YWM provides the output of an internal 3.3V regulator that powers the control circuitry. It must be decoupled with a 0.01µF ceramic capacitor to SGND and must not drive any external load - doing so risks regulation failure or thermal overstress. This dedicated bias supply isolates sensitive analog blocks from noisy power-switching paths, improving overall stability and noise immunity in the MIC2177YWM design.
Can the MIC2177YWM operate with 100% duty cycle, and what does that enable?
Yes, the MIC2177YWM supports 100% duty cycle operation, allowing continuous conduction of the high-side P-channel MOSFET when VIN approaches VOUT. This enables true low-dropout regulation - maintaining output voltage even when VIN − VOUT falls below 1V - which is essential for extending runtime in deeply discharged battery applications such as handheld medical devices or legacy industrial sensors powered by aging NiMH packs.
What protection features are built into the MIC2177YWM?
The MIC2177YWM integrates pulse-by-pulse current limiting (4.7A typical in PWM mode), thermal shutdown (activates above +125°C junction), undervoltage lockout (enables at 4.35V, disables at 4.15V), and antishoot-through logic (~50ns dead time). These protections ensure safe operation during startup, overload, overtemperature, or input brownout events - critical for reliability in unattended battery-powered systems where MIC2177YWM serves as the primary power converter.
MIC2177YWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
MIC2177YWM FAQ
1.How can I place an order for MIC2177YWM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2177YWM 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 MIC2177YWM reliable?
The price and inventory of MIC2177YWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2177YWM is usually 5 days.
3.What payment methods are accepted for MIC2177YWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2177YWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2177YWM?
MIC2177YWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2177YWM 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 MIC2177YWM?
For technical support, including MIC2177YWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2177YWM requirements.
6.How does Aetrix verify that MIC2177YWM is sourced from the original manufacturer or authorized distributors?
All MIC2177YWM 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 MIC2177YWM meets industry standards.
7.What is the process for return or replacement of MIC2177YWM?
All MIC2177YWM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2177YWM, 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 MIC2177YWM part is unused and in its original packaging.
Return procedure for MIC2177YWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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