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Microchip Technology MIC4684YM-TR
- Part No.:
- MIC4684YM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4684YM-TR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,520
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Product details
Overview
MIC4684YM-TR from Micrel, Inc. is a 2A continuous-output, 200kHz fixed-frequency synchronous buck regulator in an 8-lead Power-SO-8 package, delivering >85% efficiency across 4V–30V input and adjustable 1.235V output. It integrates an NPN power switch, bootstrap driver, thermal shutdown, over-current protection, and frequency-foldback short-circuit protection - designed for compact, high-efficiency DC/DC conversion in industrial and embedded power rails.
For engineers reviewing the MIC4684YM-TR datasheet, MIC4684YM-TR pinout, MIC4684YM-TR application, or MIC4684YM-TR equivalent, key selection criteria include its 2A output capability at 60°C ambient, 1.235V feedback reference with ±2% tolerance, 75°C/W θJA thermal resistance, and SO-8-compatible layout with dedicated ground pins (2, 6, 7) for thermal and EMI optimization.
Technical Context
The MIC4684YM-TR employs voltage-mode PWM control with a 1.235V internal bandgap reference and 200kHz oscillator. Its duty cycle is adjusted via error amplifier comparison against a sawtooth waveform, enabling stable regulation across wide input/output combinations.
It uses a bootstrap capacitor (pin 4) to drive the NPN emitter switch, reducing saturation voltage to 0.59V at 1A and maintaining high efficiency without external heat sinking. Safety features include thermal shutdown at 160°C, frequency foldback during short-circuit (30–120kHz), and TTL-compatible enable logic with 2.0V/0.8V thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous at 60°C ambient - enables replacement of TO-220/TO-263 regulators in space-constrained designs. |
| Input Voltage Range | 4V to 30V (34V transient) - supports 5V, 12V, and 24V industrial bus rails with robust transient immunity. |
| Feedback Reference | 1.235V ±2% - sets precise output voltage via external resistor divider; enables 1.8V–5V adjustable outputs. |
| Switching Frequency | 200kHz fixed (180–225kHz range) - balances EMI, inductor size, and efficiency for general-purpose buck applications. |
| Saturation Voltage | 0.59V at 1A - reduces conduction loss and improves efficiency vs. standard NPN switches without bootstrap assist. |
| Thermal Shutdown | 160°C junction temperature - protects device under overload or poor PCB thermal design; recovers automatically on cooldown. |
| Enable Thresholds | 2.0V (min ON), 0.8V (max OFF) - provides noise-immune TTL-level control with built-in hysteresis for stable startup/shutdown. |
Pinout & Package
Package: 8-lead Power-SO-8 (SOP-8M) with exposed die-attach paddle thermally connected to pins 2, 6, and 7 (GND). Thermal resistance θJA = 75°C/W (typical), θJC = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch node (NPN emitter) | Connects to inductor and Schottky diode cathode; swings from –0.5V to VIN–VSAT; critical for EMI and layout. |
| 2, 6, 7 (GND) | Power and signal ground | Shared low-impedance return path for switch, input cap, and output cap; must connect to ≥6 cm² PCB ground plane. |
| 3 (IN) | Input supply (NPN collector) | Accepts 4V–30V unregulated input; connects to input capacitor cathode and clamping diode anode. |
| 4 (BS) | Bootstrap voltage node | Drives NPN base via external capacitor; raises gate drive above VIN to reduce VSAT and boost efficiency. |
| 5 (FB) | Feedback input | Compares output voltage (via resistor divider) to 1.235V reference; determines regulation accuracy and loop stability. |
| 8 (EN) | Enable control input | TTL-compatible; high = active regulation, low = shutdown (150µA quiescent); hysteresis prevents noise-induced toggling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NPN power switch with bootstrap drive | Reduces saturation voltage to 0.59V, enabling >85% efficiency without external MOSFET drivers or heat sinks. |
| Three dedicated ground pins (2, 6, 7) + thermal paddle | Provides low-thermal-resistance path to PCB ground plane (θJA = 75°C/W), supporting 2A continuous operation at 60°C ambient. |
| Frequency-foldback short-circuit protection | Reduces switching frequency from 200kHz to ~70kHz during hard shorts, limiting energy per cycle and preventing thermal runaway. |
| 1.235V ±2% precision feedback reference | Enables accurate output voltage setting (e.g., 1.8V, 2.5V, 3.3V, 5V) with minimal resistor tolerance impact on regulation. |
| TTL-compatible enable with hysteresis | Ensures clean startup/shutdown with 2.0V/0.8V thresholds; eliminates false triggering in noisy industrial environments. |
Applications
| Industrial 5V-to-3.3V Point-of-Load | Embedded 12V-to-1.8V Core Supply |
|---|---|
Use Scenario: Converting 5V system rail to 3.3V for microcontrollers, FPGAs, and I/O interfaces in factory automation controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 3.3V at up to 1.7A with feed-forward diode configuration for low headroom. Use Value: Eliminates need for larger TO-263 packages while maintaining >88% efficiency at full load and 60°C ambient. |
Use Scenario: Generating 1.8V core voltage for DSPs and ARM processors from a 12V intermediate bus in telecom baseband cards. IC Role / Device Role / Timing Role: Adjustable buck converter operating at 200kHz with external R1/R2 divider to set 1.8V output. Use Value: Delivers 2A continuous current with fast transient response and thermal shutdown protection under dynamic load steps. |
| Battery-Powered 24V-to-5V System Rail | On-Card Switching Regulator for Test Equipment |
Use Scenario: Stepping down 24V battery input to stable 5V for analog front-ends and data acquisition modules in portable instrumentation. IC Role / Device Role / Timing Role: High-input-voltage buck regulator leveraging 30V max rating and 34V transient tolerance for ruggedized operation. Use Value: Maintains >85% efficiency across 0.1–2A load range and survives automotive-style load dumps without external TVS. |
Use Scenario: Compact, surface-mount DC/DC solution on dense PCBs for automated test equipment requiring isolated 3.3V/2.5V rails. IC Role / Device Role / Timing Role: All-SMT buck regulator replacing linear regulators to reduce board heat and improve power density. Use Value: SO-8 footprint enables single-layer ground plane routing; no through-hole components required for full functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | 3A rated, 34V max input, 500kHz switching, requires external compensation; no integrated bootstrap diode. | Higher current and frequency, but needs more external components and careful loop tuning. | Choose MP2307DN-LF-Z when >2A output or faster transient response is required, and layout allows added complexity. |
| LM2678SX-5.0/NOPB | 5V fixed output, 5A rated, 260kHz, TO-263-5 package; no adjustable feedback or enable pin. | Fixed-output only; lacks EN control and programmability; larger thermal footprint required. | Choose LM2678SX-5.0/NOPB only for simple 5V/5A applications where adjustability and compact SO-8 are not needed. |
Compared with MP2307DN-LF-Z and LM2678SX-5.0/NOPB, the MIC4684YM-TR offers optimal balance of 2A capability, SO-8 footprint, integrated bootstrap, and enable functionality - making it ideal for space-constrained, adjustable, and thermally managed industrial DC/DC designs where simplicity and reliability are prioritized over peak current or frequency.
Availability
MIC4684YM-TR is available at Aetrix Electronics and suitable for industrial power supplies, embedded computing rails, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for MIC4684YM-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
Micrel, Inc. was a U.S.-based analog and mixed-signal semiconductor company founded in 1978 and acquired by Microchip Technology in 2015; known for high-performance power management, timing, and interface ICs.
The MIC4684YM-TR belongs to Micrel's SuperSwitcher™ family of integrated buck regulators, engineered specifically for high-efficiency, low-EMI, and thermally robust point-of-load conversion in industrial and embedded systems.
FAQ
What is the maximum continuous output current of the MIC4684YM-TR?
The MIC4684YM-TR delivers 2A continuous output current at 60°C ambient temperature when mounted on a PCB with ≥6 cm² ground plane connected to pins 2, 6, and 7. Derating applies above 60°C ambient; the device enters thermal shutdown at 160°C junction temperature. The MIC4684YM-TR achieves this using its Power-SO-8 package with integrated thermal paddle and three GND pins for efficient heat dissipation.
Does the MIC4684YM-TR require an external bootstrap diode?
No, the MIC4684YM-TR does not require an external bootstrap diode - it integrates internal bootstrap charging circuitry that works with an external ceramic capacitor (typically 0.33µF, 50V) connected between BS (pin 4) and SW (pin 1). This architecture eliminates discrete diodes while maintaining low saturation voltage (0.59V) and high efficiency. The MIC4684YM-TR datasheet confirms full functionality with only the external capacitor.
Can the MIC4684YM-TR be used for 5V-to-3.3V conversion with low headroom?
Yes, the MIC4684YM-TR supports low-headroom 5V-to-3.3V conversion using the feed-forward diode configuration described in the datasheet. A Schottky diode (e.g., SS34) from VIN to BS provides additional bias, reducing effective dropout and enabling stable regulation even with <2V input-output differential. This method is validated in MIC4684YM-TR evaluation boards and maintains >88% efficiency at 1.7A output.
What is the feedback reference voltage and tolerance for the MIC4684YM-TR?
The MIC4684YM-TR features a precision 1.235V internal bandgap reference at the FB pin, with ±2% tolerance over –40°C to +125°C junction temperature. Electrical characteristics confirm 1.210V (min) to 1.260V (max) at 25°C, and 1.186V to 1.284V across full operating conditions. This reference enables accurate output setting for common voltages like 1.8V, 2.5V, 3.3V, and 5V using standard 1% resistors in the feedback divider.
How does the MIC4684YM-TR handle short-circuit conditions?
The MIC4684YM-TR implements frequency-foldback short-circuit protection: when output is shorted, switching frequency drops from 200kHz to ~70kHz, reducing energy per cycle and limiting power dissipation. Combined with thermal shutdown at 160°C and current limit of 2.2A (typ), this ensures robust fault recovery without latch-up or damage. The MIC4684YM-TR resumes normal operation automatically after fault removal and cooldown.
MIC4684YM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SuperSwitcher™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 30V
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- 28.2V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC4684YM-TR FAQ
1.How can I place an order for MIC4684YM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4684YM-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 MIC4684YM-TR reliable?
The price and inventory of MIC4684YM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4684YM-TR is usually 5 days.
3.What payment methods are accepted for MIC4684YM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4684YM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4684YM-TR?
MIC4684YM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4684YM-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 MIC4684YM-TR?
For technical support, including MIC4684YM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4684YM-TR requirements.
6.How does Aetrix verify that MIC4684YM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4684YM-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 MIC4684YM-TR meets industry standards.
7.What is the process for return or replacement of MIC4684YM-TR?
All MIC4684YM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4684YM-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 MIC4684YM-TR part is unused and in its original packaging.
Return procedure for MIC4684YM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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