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Microchip Technology MIC4680YM
- Part No.:
- MIC4680YM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4680YM.pdf
- Description:
- IC REG BUCK ADJ 1.3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,055
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Product details
Overview
MIC4680YM from Micrel is a fixed-frequency, internally compensated 200kHz buck regulator IC with adjustable output voltage (1.25V to 34V), 4V–34V input range, and up to 1.3A continuous output current in an 8-pin Power SOIC package. It integrates an NPN power switch, 1.23V bandgap reference, error amplifier, and thermal shutdown - used in industrial DC-DC point-of-load conversion where compact size and minimal external components are critical.
For engineers reviewing the MIC4680YM datasheet, MIC4680YM pinout, MIC4680YM application, or MIC4680YM equivalent, key selection considerations include its 200kHz fixed switching frequency, internal compensation enabling fast transient response with only four external components, shutdown current <2µA, and thermal protection at 160°C junction temperature.
Technical Context
The MIC4680YM uses voltage-mode control architecture: a 1.23V precision bandgap reference feeds an error amplifier whose output compares against a 200kHz sawtooth oscillator waveform to generate variable-duty-cycle PWM. Cycle-by-cycle current limiting and thermal shutdown provide fault protection without external circuitry.
Its Power SOIC-8 package features pins 5–8 and the die-attach paddle as a single metal structure, achieving θJA = 63°C/W and enabling high-current operation up to 1.3A with proper ground-plane layout - unlike standard SOIC-8 packages which lack this thermal design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 34V - supports wide industrial input rails including 12V, 24V, and 32V systems without pre-regulation. |
| Output Current | Up to 1.3A continuous - sufficient for powering microcontrollers, FPGAs, and analog subsystems from a single-stage buck. |
| Switching Frequency | 200kHz ±20kHz - enables use of standard low-cost 68µH inductors and avoids EMI-sensitive bands. |
| Feedback Reference | 1.23V ±1% - sets output via external resistor divider; stable over –40°C to +125°C junction temperature. |
| Shutdown Current | <2µA typical - allows ultra-low-power standby in battery-backed or energy-conscious systems. |
| Thermal Shutdown | 160°C - protects device during overload or poor heatsinking; auto-recovery after cooldown. |
| Efficiency | Up to 90% - measured at 5V/1A with 12V input, reducing thermal load and simplifying thermal management. |
Pinout & Package
Package: 8-pin Power SOIC (M) with integrated thermal paddle (pins 5–8 connected to GND and die attach); rated for –40°C to +125°C junction temperature; designed for PCB ground-plane heat sinking (minimum 6 cm² recommended).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | TTL-compatible logic input: low enables regulation; high (>1.6V) disables switch and reduces quiescent current to <2µA. |
| 2 (VIN) | Main power input | Accepts unregulated 4V–34V supply; requires local 15µF/35V ceramic or tantalum bypass capacitor. |
| 3 (SW) | Switch node output | Drives external inductor and Schottky diode; connects to L1 and D1; carries high di/dt switching current. |
| 4 (FB) | Voltage feedback input | Senses output via resistive divider; referenced to 1.23V internal bandgap; critical for stability and accuracy. |
| 5–8 (GND) | Power and signal ground | All four pins tied internally to thermal paddle; must connect to large PCB ground plane for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network - enables stable operation with 68µH inductor and 220µF output capacitor. |
| Fixed 200kHz oscillator | Provides predictable EMI profile and simplifies filter design; frequency foldback activates under short-circuit to limit power dissipation. |
| Integrated NPN power switch | Reduces BOM count and layout complexity; eliminates need for external MOSFET driver and gate resistor. |
| Thermal shutdown with auto-recovery | Protects against sustained overload or inadequate heatsinking; resumes regulation once junction cools below 160°C threshold. |
| Low shutdown quiescent current | Enables long-term battery operation in sleep modes - draws only 1.5µA typical when SHDN = VIN = 12V. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Providing regulated 3.3V/1A power to microcontroller, CAN transceiver, and sensor interface circuitry on a DIN-rail mounted PLC module. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V rail to 3.3V; operates continuously at ambient up to 70°C with no forced air cooling. Use Value: Single-chip solution replaces discrete buck controller + external MOSFET, reducing board area by >40% and eliminating compensation tuning. | Use Scenario: Generating 5V/1A for infotainment MCU and display backlight drivers in a 12V automotive body control unit. IC Role / Device Role / Timing Role: Input-filtered buck regulator handling cold-crank (4.5V) to load-dump (34V) transients per ISO 7637-2. Use Value: Wide 4V–34V input range and cycle-by-cycle current limiting ensure reliable startup and fault tolerance without external protection circuitry. |
| Medical Point-of-Care Instrumentation | Industrial IoT Edge Node |
Use Scenario: Supplying 2.5V/1A to ADC, op-amps, and wireless SoC in a portable diagnostic device powered by Li-ion battery pack (8–12.6V). IC Role / Device Role / Timing Role: Adjustable buck converter configured for 2.5V output using 3.01kΩ/2.915kΩ resistor divider; enabled only during measurement cycles. Use Value: Sub-2µA shutdown current extends battery life between measurements; internal compensation ensures consistent start-up behavior across temperature. | Use Scenario: Regulating 3.3V/1A for LoRaWAN node MCU, SX1276 transceiver, and environmental sensors operating in remote outdoor enclosures. IC Role / Device Role / Timing Role: Primary DC-DC stage converting 12V solar/battery input to stable 3.3V; operates across –40°C to +85°C ambient. Use Value: –40°C to +125°C junction rating and stable 1.23V reference ensure output accuracy and reliability in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-ADJ/NOPB | 500kHz switching frequency; requires external compensation; 5A max output; larger SOIC-8 footprint. | Better suited for higher-current, space-constrained designs needing faster transient response. | Choose LM2678-ADJ/NOPB if output current >1.3A or 500kHz operation is required; verify PCB layout supports higher di/dt. |
| TPS54202DR | 2.5V–17V input; 2A output; 500kHz–2.2MHz programmable frequency; integrated MOSFETs; smaller 8-pin SO-PowerPAD. | Requires external soft-start and compensation; better for low-input-voltage, high-efficiency applications. | Choose TPS54202DR if input voltage ≤17V and efficiency >92% is critical; note different thermal pad mounting requirements. |
Compared with LM2678-ADJ/NOPB and TPS54202DR, the MIC4680YM offers lower component count due to internal compensation and wider 4V–34V input range, making it optimal for industrial 24V systems where simplicity and ruggedness outweigh peak efficiency demands.
Availability
MIC4680YM is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control units, medical instrumentation, and industrial IoT edge nodes requiring stable component supply and long-lifecycle support.
Supply support for MIC4680YM 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 MIC4680YM belongs to Micrel's SuperSwitcher™ family of integrated buck regulators, designed specifically for high-reliability industrial and automotive applications demanding wide input range, minimal external components, and robust thermal performance.
FAQ
What is the maximum output current capability of the MIC4680YM?
The MIC4680YM delivers up to 1.3A continuous output current under typical conditions (TJ ≤ 125°C, adequate PCB ground plane). This value is limited by thermal dissipation - not peak current - and depends on input-output voltage differential, ambient temperature, and copper area connected to pins 5–8. At 12V input and 5V output, full 1.3A is achievable with ≥6 cm² ground plane; derating applies above 85°C ambient.
Does the MIC4680YM require external compensation components?
No, the MIC4680YM features fully internal frequency compensation optimized for stability with standard 68µH inductors and 220µF output capacitors. This eliminates external RC networks, reduces design risk, and accelerates time-to-market. The internal compensation ensures ≥35° phase margin across all operating conditions, as verified in the manufacturer's bode plot analysis.
Can the MIC4680YM be used in adjustable-output configurations?
Yes, the MIC4680YM is the adjustable version of the MIC4680 family and is explicitly specified for output voltages down to 1.25V using an external resistor divider on the FB pin. The internal 1.23V reference provides ±1% accuracy over temperature, and recommended resistor values for common outputs (e.g., 2.5V, 3.3V, 5V) are documented in the datasheet's Figure 1b.
What is the shutdown behavior of the MIC4680YM?
When the SHDN pin is pulled high (>1.6V), the MIC4680YM disables its internal switch and reduces total supply current to less than 2µA typical. The shutdown input has TTL-compatible thresholds (≤0.8V for enable, ≥1.6V for disable) and hysteresis to prevent chatter near the transition point. During shutdown, the SW pin floats and FB remains high-impedance.
Is the MIC4680YM RoHS-compliant and lead-free?
Yes, the MIC4680YM is a Pb-free (lead-free) part, as confirmed in the Ordering Information table of the official datasheet (M9999-032808). It meets RoHS Directive 2011/65/EU requirements and is marked with appropriate packaging identifiers indicating compliance. No lead-based solder reflow profiles are required.
MIC4680YM 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 34V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 32.98V
- 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
MIC4680YM FAQ
1.How can I place an order for MIC4680YM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4680YM 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 MIC4680YM reliable?
The price and inventory of MIC4680YM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4680YM is usually 5 days.
3.What payment methods are accepted for MIC4680YM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4680YM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4680YM?
MIC4680YM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4680YM 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 MIC4680YM?
For technical support, including MIC4680YM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4680YM requirements.
6.How does Aetrix verify that MIC4680YM is sourced from the original manufacturer or authorized distributors?
All MIC4680YM 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 MIC4680YM meets industry standards.
7.What is the process for return or replacement of MIC4680YM?
All MIC4680YM units undergo pre-shipment inspection (PSI). If there is an issue with MIC4680YM, 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 MIC4680YM part is unused and in its original packaging.
Return procedure for MIC4680YM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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