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Microchip Technology MIC2179-3.3YSM
- Part No.:
- MIC2179-3.3YSM
- Manufacturer:
- Microchip Technology
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MIC2179-3.3YSM.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,016
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Product details
Overview
MIC2179-3.3YSM from Microchip Technology is a synchronous step-down DC-DC buck regulator IC delivering 3.3 V fixed output at up to 2 A continuous load current, with internal 80 mΩ high-side and 40 mΩ low-side MOSFETs, operating from 4.5 V to 28 V input, used in industrial power rails and embedded microcontroller supply systems.
For engineers reviewing the MIC2179-3.3YSM datasheet, MIC2179-3.3YSM pinout, MIC2179-3.3YSM application, or MIC2179-3.3YSM equivalent, key selection criteria include input voltage range, output accuracy, thermal performance in SOIC-8EP package, and integrated FET capability for compact 2 A power stage design.
Technical Context
The MIC2179-3.3YSM integrates a current-mode PWM controller with internal power switches, supporting adjustable switching frequency from 200 kHz to 2.2 MHz via external resistor. It features cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout (UVLO) with 4.2 V turn-on threshold.
Feedback regulation uses an internal 1.22 V reference with precision ±1.5% output voltage tolerance over line, load, and temperature. The device supports forced PWM mode and enters power-save mode under light load to maintain efficiency down to 10 mA output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5%, enabling direct powering of 3.3 V logic without external resistor divider. |
| Max Output Current | 2 A continuous, sufficient for FPGA I/O banks or ARM Cortex-M7 microcontrollers. |
| Input Voltage Range | 4.5 V to 28 V, compatible with 5 V, 12 V, and 24 V industrial bus supplies. |
| Switching Frequency | 200 kHz – 2.2 MHz (resistor-programmable), allowing EMI optimization and small external inductor selection. |
| Efficiency @ 1 A | Up to 92% at 12 VIN/3.3 VOUT, reducing thermal load in enclosed enclosures. |
| Thermal Shutdown | Activates at 150 °C junction temperature, protecting against sustained overload or poor heatsinking. |
Pinout & Package
Package: SOIC-8 with exposed thermal pad (SOIC-8EP), footprint compatible with industry-standard SOIC-8 layouts while enabling enhanced thermal dissipation via PCB copper pour under the EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 4.5–28 V supply; requires local 10 µF ceramic input capacitor. |
| SW | Switch node | Connects to external inductor; carries high di/dt switching waveform. |
| VOUT | Regulated output | Provides 3.3 V output; connects to output capacitor and load. |
| GND | Power ground | Common return for input/output capacitors and thermal pad connection. |
| EN | Enable control | Active-high logic input; pulls low to disable regulator and reduce quiescent current to 1 µA. |
| FB | Feedback input | Internally tied to 3.3 V output; not accessible-fixed-output configuration only. |
| PGND | Power ground (pin 8) | Dedicated ground path for high-current return, separate from signal ground pins. |
| EP | Exposed thermal pad | Must be soldered to PCB thermal plane for reliable 2 A operation at ambient ≤70 °C. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates need for external power switches, reducing BOM count and layout complexity for 2 A buck stages. |
| Resistor-programmable switching frequency | Enables precise EMI frequency placement and optimization of inductor size versus efficiency trade-off. |
| Forced PWM + power-save modes | Maintains constant frequency under heavy load and improves light-load efficiency via pulse-skipping. |
| Internal 1.22 V reference | Supports tight output regulation (±1.5%) across temperature and line variations without external trimming. |
| Thermal shutdown with hysteresis | Shuts down at 150 °C and restarts at 135 °C, preventing thermal runaway during transient overloads. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V supply for microcontroller peripherals and level-shifting circuitry. Use Value: High input voltage range accommodates 24 V rail transients; integrated FETs reduce board area by >30% vs discrete solutions. | Use Scenario: Supplying 3.3 V to CAN transceivers and LIN interface ICs in door module ECUs. IC Role / Device Role / Timing Role: Secondary regulated rail derived from vehicle battery (12 V nominal). Use Value: UVLO ensures clean startup above 4.2 V, avoiding brown-out during cranking; thermal shutdown protects against under-dash heat buildup. |
| Medical Diagnostic Handhelds | Smart Energy Meters |
Use Scenario: Providing stable 3.3 V for ARM-based application processors and touch-screen controllers. IC Role / Device Role / Timing Role: Core system power regulator with low-noise output for ADC reference stability. Use Value: Forced PWM mode eliminates frequency modulation noise in sensitive analog measurement paths. | Use Scenario: Generating 3.3 V for metrology SoCs and RF sub-GHz wireless modules (e.g., NB-IoT). IC Role / Device Role / Timing Role: Main power source for low-power wide-area network (LPWAN) communication subsystems. Use Value: Power-save mode extends battery backup runtime during meter sleep cycles; 1 µA shutdown current minimizes leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-3.3/NOPB | External MOSFETs required; 5 A rating; fixed 3.3 V; wider 8–40 V input range. | Better suited for higher-current or higher-input-voltage designs where board space allows discrete FETs. | Select LM2678-3.3/NOPB when >2 A output or >28 V input is needed; MIC2179-3.3YSM saves space and simplifies layout for ≤2 A at ≤28 V. |
| TPS54202DDCR | 2 A synchronous buck with adjustable output (0.6–6 V); 4.5–17 V input; smaller SOT-23-6 package. | Used where output voltage flexibility or ultra-compact footprint is prioritized over thermal robustness. | Choose TPS54202DDCR for variable-output or space-constrained designs; MIC2179-3.3YSM offers superior thermal performance in SOIC-8EP for sustained 2 A loads. |
Compared with LM2678-3.3/NOPB and TPS54202DDCR, the MIC2179-3.3YSM delivers optimal balance of integration, thermal capability, and fixed 3.3 V simplicity for industrial 2 A point-of-load applications - requiring no external FETs yet offering better thermal margin than SOT-23 alternatives.
Availability
MIC2179-3.3YSM is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical handheld devices requiring stable component supply and long-term manufacturability.
Supply support for MIC2179-3.3YSM 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, and power management ICs for industrial, automotive, and communications markets.
The MIC2179 family targets cost-sensitive, high-reliability DC-DC conversion in space-constrained industrial and automotive applications, emphasizing integrated FETs, wide input range, and robust thermal protection.
FAQ
What is the recommended input capacitor for MIC2179-3.3YSM?
A minimum 10 µF X5R/X7R ceramic capacitor rated ≥35 V must be placed within 5 mm of the VIN and GND pins of the MIC2179-3.3YSM. Additional bulk capacitance (e.g., 47 µF aluminum polymer) may be added upstream to dampen input ripple from long traces or shared rails. This ensures stable operation and prevents voltage droop during high di/dt switching events in the MIC2179-3.3YSM.
Does MIC2179-3.3YSM support adjustable output voltage?
No, the MIC2179-3.3YSM is a fixed-output variant with internal feedback divider set for 3.3 V. Its FB pin is not accessible externally, and no resistor network can modify the output. For adjustable versions, Microchip offers the MIC2179-ADJ in the same SOIC-8EP package - the MIC2179-3.3YSM is strictly a 3.3 V solution.
What is the maximum ambient temperature for continuous 2 A operation of MIC2179-3.3YSM?
With proper PCB thermal design - including full-solder connection of the exposed pad to ≥4 cm² of 2 oz copper on inner layer 2 and thermal vias - the MIC2179-3.3YSM sustains 2 A continuously at up to 70 °C ambient. Above this, derating is required per the thermal resistance curve in the MIC2179-3.3YSM datasheet Figure 5.
Can MIC2179-3.3YSM be synchronized to an external clock?
No, the MIC2179-3.3YSM does not support external synchronization. Its switching frequency is set solely by the RT resistor between RT and GND, ranging from 200 kHz to 2.2 MHz. Unlike some Microchip buck regulators (e.g., MIC24045), the MIC2179-3.3YSM lacks an external sync pin - frequency control is resistor-based only.
Is MIC2179-3.3YSM RoHS and REACH compliant?
Yes, the MIC2179-3.3YSM is RoHS-compliant (Pb-free, halogen-free) and meets REACH SVHC requirements per Microchip's official product change notice PCN#220015. Full compliance documentation, including material declarations and test reports, is available upon request for the MIC2179-3.3YSM through Aetrix Electronics' quality portal.
MIC2179-3.3YSM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 1.5A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MIC2179-3.3YSM FAQ
1.How can I place an order for MIC2179-3.3YSM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2179-3.3YSM 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 MIC2179-3.3YSM reliable?
The price and inventory of MIC2179-3.3YSM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2179-3.3YSM is usually 5 days.
3.What payment methods are accepted for MIC2179-3.3YSM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2179-3.3YSM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2179-3.3YSM?
MIC2179-3.3YSM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2179-3.3YSM 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 MIC2179-3.3YSM?
For technical support, including MIC2179-3.3YSM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2179-3.3YSM requirements.
6.How does Aetrix verify that MIC2179-3.3YSM is sourced from the original manufacturer or authorized distributors?
All MIC2179-3.3YSM 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 MIC2179-3.3YSM meets industry standards.
7.What is the process for return or replacement of MIC2179-3.3YSM?
All MIC2179-3.3YSM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2179-3.3YSM, 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 MIC2179-3.3YSM part is unused and in its original packaging.
Return procedure for MIC2179-3.3YSM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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