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Microchip Technology MIC4680-3.3YM
- Part No.:
- MIC4680-3.3YM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4680-3.3YM.pdf
- Description:
- IC REG BUCK 3.3V 1.3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,785
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Product details
Overview
MIC4680-3.3YM from Micrel is a fixed-output 3.3V, 1.3A continuous current buck regulator with internal NPN switch, 200kHz fixed-frequency operation, and 4V–34V input range. It integrates cycle-by-cycle current limiting and thermal shutdown, and operates in an 8-pin Power SOIC package rated for –40°C to +125°C junction temperature - used in industrial power supplies and embedded DC/DC conversion.
For engineers reviewing the MIC4680-3.3YM datasheet, MIC4680-3.3YM pinout, MIC4680-3.3YM application, or MIC4680-3.3YM equivalent, key selection criteria include its fixed 3.3V output tolerance (±1% at 25°C), 1.5µA typical shutdown current, internal compensation, and compatibility with standard 68µH inductors and Schottky diodes in compact board designs.
Technical Context
The MIC4680-3.3YM implements voltage-mode control using a 1.23V bandgap reference and a 200kHz sawtooth oscillator. Feedback is internally tied to the output, eliminating external resistor dividers. Its duty cycle adjusts dynamically to maintain regulation across line and load transients.
Protection architecture includes cycle-by-cycle current limiting (1.3A min short-circuit limit), thermal shutdown at 160°C, and frequency foldback under hard short-circuit conditions to reduce per-cycle energy dissipation. Shutdown logic is TTL-compatible with 0.8V low-enable threshold and 1.6V high-disable threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (25°C), ±3% over full temperature/load range - ensures stable logic rail generation without external feedback components. |
| Max Output Current | 1.3A continuous - supports single-rail microcontroller or FPGA core supply with margin for transient loads. |
| Input Voltage Range | 4V to 34V - enables direct operation from 5V, 12V, 24V, or automotive battery inputs without pre-regulation. |
| Switching Frequency | 200kHz ±10% - balances EMI performance and inductor size; compatible with standard 68µH shielded inductors. |
| Shutdown Current | 30µA typical at VSHDN = 5V - preserves battery life in always-on systems requiring low-power sleep modes. |
| Efficiency | Up to 90% at 1A (12V→3.3V) - reduces thermal load on PCB and eliminates need for heatsinking in most applications. |
| Thermal Shutdown | 160°C - provides fail-safe protection during overload or poor layout, with automatic recovery after cooldown. |
Pinout & Package
Package: 8-pin Power SOIC (SOIC-8 with enhanced thermal pad structure; pins 5–8 and die-attach paddle form a unified ground path for θJA = 63°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | TTL-compatible enable: ≤0.8V enables regulator; ≥1.6V disables it and reduces quiescent current to <30µA. |
| 2 (IN) | Main power input | Accepts unregulated 4V–34V; requires local 15µF/35V ceramic or tantalum bypass capacitor. |
| 3 (SW) | Internal NPN switch emitter | Drives external storage inductor and Schottky diode; peak voltage reaches VIN during off-time. |
| 4 (FB) | Feedback input | Internally connected to output; no external divider needed for fixed 3.3V version. |
| 5–8 (GND) | Ground terminals | All four pins are electrically common and thermally coupled to die-attach paddle - must be soldered to large PCB ground plane (≥6 cm²) for thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates external compensation network - simplifies design and guarantees stability with 68µH/220µF output filter. |
| Fixed 200kHz switching | Predictable EMI profile and consistent inductor sizing - avoids variable-frequency noise spread in sensitive analog sections. |
| Power SOIC-8 package | Thermally optimized layout with pins 5–8 as integrated heat sink - enables 1.3A operation without external FET or heatsink. |
| Cycle-by-cycle current limit | 1.3A minimum trip threshold - protects against shorted outputs and inrush without latch-up or external sensing resistors. |
| Frequency foldback | Reduces switching frequency to 30–50kHz during hard short - limits power dissipation and prevents thermal runaway. |
Applications
| Industrial Power Supply | Embedded Microcontroller Rail |
|---|---|
Use Scenario: Generating 3.3V from 12V or 24V factory floor power bus for PLC I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, regulated 3.3V to digital logic and communication interfaces. Use Value: Replaces discrete buck controllers + MOSFETs with single IC, reducing BOM count and improving reliability over wide input voltage swings. | Use Scenario: Powering ARM Cortex-M4-based edge sensor nodes with battery backup capability. IC Role / Device Role / Timing Role: Main system regulator supporting active and low-power shutdown states via SHDN pin control. Use Value: 30µA shutdown current extends battery life; fixed 3.3V output eliminates calibration drift from external resistor tolerances. |
| Automotive Body Control Module | On-Card DC/DC Converter |
Use Scenario: Converting 12V vehicle battery to 3.3V for CAN transceivers and microcontrollers in non-safety-critical modules. IC Role / Device Role / Timing Role: Input-tolerant buck converter handling cold-crank (4V) and load-dump (34V) transients. Use Value: Wide 4V–34V input range and thermal shutdown ensure robust operation across automotive voltage extremes. | Use Scenario: Local regulation on high-density compute cards where space prohibits through-hole TO-220 solutions. IC Role / Device Role / Timing Role: Compact surface-mount buck regulator replacing legacy linear regulators or larger switching modules. Use Value: SOIC-8 footprint achieves 1.3A output in same area as 78L33 LDO - improves power density without sacrificing thermal performance. |
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 | 5A rated, external compensation required, 260kHz switching, higher quiescent current (50mA active) | Better suited for higher-current designs but demands more layout effort and external components | Select LM2678-3.3 only when >1.3A output or adjustable frequency is required; MIC4680-3.3YM offers simpler, lower-IQ solution for 1A-class rails. |
| TPS54331 | 3A rated, adjustable output, 570kHz switching, requires external feedback resistors and compensation | Designed for higher efficiency at light loads and smaller inductors, but lacks fixed 3.3V option and internal compensation | Choose TPS54331 for designs needing programmability or ultra-compact magnetics; MIC4680-3.3YM delivers plug-and-play 3.3V regulation with minimal external parts. |
Compared with LM2678-3.3 and TPS54331, the MIC4680-3.3YM trades peak current headroom and frequency flexibility for design simplicity, lower standby power, and guaranteed stability - making it optimal for cost-sensitive, space-constrained 1A fixed-output applications where rapid time-to-market matters.
Availability
MIC4680-3.3YM is available at Aetrix Electronics and suitable for industrial power supplies, embedded microcontroller rails, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for MIC4680-3.3YM 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 MIC4680 family was designed as a highly integrated, easy-to-use buck regulator series targeting space-constrained industrial and embedded systems needing reliable 1A-level DC/DC conversion without complex compensation or external FETs.
FAQ
What is the maximum continuous output current of the MIC4680-3.3YM?
The MIC4680-3.3YM delivers up to 1.3A continuous output current under proper thermal conditions - verified across –40°C to +125°C junction temperature with adequate PCB ground plane (≥6 cm² connected to pins 5–8). Derating applies above 85°C ambient or with insufficient copper area.
Does the MIC4680-3.3YM require external feedback resistors?
No. The MIC4680-3.3YM is a fixed-output variant with internal feedback divider tied to the FB pin, so no external resistors are needed. This differs from the adjustable MIC4680BM, which requires R1/R2 to set VOUT. Using external resistors with MIC4680-3.3YM will disrupt regulation.
What is the shutdown behavior of the MIC4680-3.3YM?
When SHDN (Pin 1) is pulled ≥1.6V, the MIC4680-3.3YM enters shutdown mode, disabling the internal switch and reducing total supply current to 30µA typical (at VSHDN = 5V). The output discharges through the load and external diode; no hold-up capacitor is retained. Pulling SHDN ≤0.8V re-enables regulation.
Can the MIC4680-3.3YM operate from a 5V input?
Yes - the MIC4680-3.3YM supports input voltages from 4V to 34V, including 5V. However, minimum input is VOUT + 2.5V = 5.8V for full-load operation at 1.3A due to saturation voltage (~1.4–1.8V) of the internal NPN switch. At 5V input, max sustainable output current drops to ~0.5A.
Is the MIC4680-3.3YM RoHS-compliant and lead-free?
Yes. Per the Ordering Information table in the datasheet, MIC4680-3.3YM is the Pb-Free (lead-free) version of the 3.3V fixed-output regulator in 8-pin SOIC package, compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3.
MIC4680-3.3YM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SuperSwitcher™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 34V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.3A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC4680-3.3YM FAQ
1.How can I place an order for MIC4680-3.3YM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4680-3.3YM 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 MIC4680-3.3YM reliable?
The price and inventory of MIC4680-3.3YM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4680-3.3YM is usually 5 days.
3.What payment methods are accepted for MIC4680-3.3YM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4680-3.3YM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4680-3.3YM?
MIC4680-3.3YM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4680-3.3YM 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 MIC4680-3.3YM?
For technical support, including MIC4680-3.3YM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4680-3.3YM requirements.
6.How does Aetrix verify that MIC4680-3.3YM is sourced from the original manufacturer or authorized distributors?
All MIC4680-3.3YM 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 MIC4680-3.3YM meets industry standards.
7.What is the process for return or replacement of MIC4680-3.3YM?
All MIC4680-3.3YM units undergo pre-shipment inspection (PSI). If there is an issue with MIC4680-3.3YM, 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 MIC4680-3.3YM part is unused and in its original packaging.
Return procedure for MIC4680-3.3YM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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