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Microchip Technology MIC4684BM-TR
- Part No.:
- MIC4684BM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4684BM-TR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,733
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Product details
Overview
MIC4684BM-TR from Micrel, Inc. is a 2A continuous-output, 200kHz fixed-frequency synchronous buck regulator in an 8-lead Power-SO-8 package. It delivers high-efficiency step-down conversion (≥85% at 1.8V/2A, VIN=12V), supports 4V–30V input (34V transient), and regulates adjustable output voltages down to 1.235V via external resistor divider. It is used in on-card DC/DC conversion for industrial power rails and battery-powered systems requiring compact, thermally robust regulation.
For engineers reviewing the MIC4684BM-TR datasheet, MIC4684BM-TR pinout, MIC4684BM-TR application, or MIC4684BM-TR equivalent, key selection criteria include its 2A SO-8 current capability without heatsink, bootstrap-enhanced NPN saturation voltage (0.59V typ.), thermal shutdown at 160°C, and compatibility with feed-forward diode configurations for low-headroom operation (e.g., 5V→3.3V).
Technical Context
The MIC4684BM-TR implements voltage-mode PWM control with a 1.235V internal bandgap reference and fixed 200kHz oscillator. Its NPN-based power switch uses a bootstrap capacitor (pin 4) to elevate gate drive above VIN, reducing VCE(sat) and enabling >85% efficiency across 0.1–2A load range. Feedback is sensed at pin 5 with ±2% reference tolerance over –40°C to +125°C junction temperature.
Protection includes frequency-foldback short-circuit response (30–120kHz), cycle-by-cycle over-current limiting (2.2A typ.), and thermal shutdown. The device requires no external compensation and maintains stable regulation under fast load transients (e.g., 1A ↔ 0.1A step) due to internally compensated error amplifier and fast-response architecture.
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 wide-input industrial and automotive battery-supplied systems |
| Switching Frequency | 200kHz fixed - balances EMI performance and inductor size; folds back to 30–120kHz during short circuit |
| Feedback Reference | 1.235V ±2% - sets output voltage via external R1/R2 divider; stable over temperature and line/load |
| Saturation Voltage | 0.59V typ. at 1A - reduced by bootstrap drive, enabling high efficiency without external MOSFET driver |
| Thermal Shutdown | 160°C - protects die during overload or poor PCB thermal design; recovers automatically after cooldown |
| Enable Threshold | 2.0V min. (ON), 0.8V max. (OFF) - TTL-compatible logic control with 1.2V hysteresis prevents noise-induced toggling |
Pinout & Package
Package: Power-SO-8 (M), with integrated thermal paddle connected to pins 2, 6, and 7 (GND). Pins 2/6/7 share common ground return path optimized for low θJA (75°C/W typical) and high-current switching node integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Node | Emiter of internal NPN; connects to inductor and Schottky diode; swings from –0.5V to VIN–VCE(sat) |
| 2, 6, 7 (GND) | Power Ground | Common return for input cap, output cap, and diode; electrically tied to thermal paddle for heat dissipation |
| 3 (IN) | Input Supply | Collector of internal NPN; accepts 4–30V unregulated input; requires low-inductance connection to CIN |
| 4 (BS) | Bootstrap Node | Drives external 0.33µF capacitor to generate gate bias >VIN for NPN saturation enhancement |
| 5 (FB) | Feedback Input | Senses output voltage divider; referenced to 1.235V bandgap; determines regulated VOUT = 1.235×(1+R1/R2) |
| 8 (EN) | Enable Control | TTL-compatible digital input; high ≥2.0V enables regulation; low ≤0.8V reduces quiescent current to 150µA |
Key Features
| Feature | Design Value |
|---|---|
| SO-8 2A power integration | Eliminates need for external MOSFETs, drivers, or heatsinks in ≤2A applications |
| Bootstrap-enhanced efficiency | Reduces VCE(sat) from 1.8V to 0.59V, raising efficiency from 75% to 88% at full load |
| Feed-forward diode support | Enables operation with <2.5V input-to-output headroom (e.g., 5V→3.3V), extending usable VIN range |
| Internally compensated loop | Removes requirement for external compensation network; ensures stability with standard output capacitors |
| Frequency-foldback protection | Reduces switching energy per cycle during hard short, preventing thermal runaway without latch-off |
Applications
| Industrial Sensor Node Power | Portable Instrumentation DC/DC |
|---|---|
|
Use Scenario: Regulating 12V battery supply to 3.3V for microcontroller, ADC, and wireless transceiver in field-deployed sensor nodes. IC Role / Device Role / Timing Role: Primary buck converter providing clean, efficient, and thermally stable 3.3V rail with minimal board area. Use Value: Delivers 1.7A at 85% efficiency (VIN=12V), operates up to 85°C ambient, and avoids thermal derating with standard 6 cm² ground plane. |
Use Scenario: Converting 5V USB or Li-ion battery (4.2V–3.3V) to 2.5V for precision analog front-end and low-power MCU in handheld test equipment. IC Role / Device Role / Timing Role: Adjustable buck regulator supporting low-headroom conversion using feed-forward diode configuration. Use Value: Achieves 2A output at 1.8V with 5V input via feed-forward path, maintaining >80% efficiency where standard buck would fail. |
| On-Card FPGA Core Supply | Dual-Output ±5V Converter |
|
Use Scenario: Generating 1.8V core voltage for Xilinx Spartan-6 FPGA on embedded control board with 12V system rail. IC Role / Device Role / Timing Role: High-current, low-noise point-of-load regulator with fast transient response for dynamic FPGA load changes. Use Value: Maintains ±1% output regulation under 1A ↔ 0.1A load steps; feedback loop rejects noise from adjacent digital circuits. |
Use Scenario: Building dual-rail ±5V supply from single 12V input for op-amp signal conditioning and data acquisition circuits. IC Role / Device Role / Timing Role: Primary buck stage generating +5V; second inverting buck-boost stage referenced to its output creates –5V rail. Use Value: Enables compact dual-output solution using one MIC4684BM-TR and one inverting controller, avoiding discrete linear regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | Fixed 5V output; 5A rating; requires external compensation; no bootstrap or feed-forward support | Better suited for higher-current fixed-output applications; lacks adjustable VOUT and low-headroom capability | Select when 5V fixed output and >2A peak load are required; avoid if adjustable voltage or 5V→3.3V conversion is needed |
| TPS54202DRCT | 2A synchronous buck; 4.5–28V input; 500kHz switching; integrated FETs; requires external compensation | Higher frequency allows smaller magnetics; lower quiescent current (25µA); no bootstrap node or feed-forward option | Prefer for ultra-compact layouts needing <1MHz operation; choose MIC4684BM-TR when feed-forward diode support or proven 200kHz EMI profile is critical |
Compared with LM2678-5.0/NOPB and TPS54202DRCT, the MIC4684BM-TR uniquely combines SO-8 2A power density, bootstrap-enhanced NPN drive, and feed-forward diode compatibility-making it optimal for low-headroom, thermally constrained, adjustable-output buck applications where simplicity and proven ruggedness outweigh the need for synchronous rectification or sub-100µA quiescent current.
Availability
MIC4684BM-TR is available at Aetrix Electronics and suitable for industrial sensor nodes, portable instrumentation, FPGA core supplies, and dual-rail analog systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC4684BM-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 power IC manufacturer (acquired by Microchip Technology in 2015) known for high-reliability DC/DC converters, timing devices, and interface solutions targeting industrial and communications markets.
The MIC4684 family was designed as a high-current, thermally robust buck regulator platform for space-constrained applications needing >2A output in SO-8 without external drivers or heatsinks-emphasizing ease of use, rugged transient handling, and broad input voltage support.
FAQ
What is the maximum continuous output current of the MIC4684BM-TR?
The MIC4684BM-TR delivers 2A continuous output current at 60°C ambient temperature when mounted on a PCB with ≥6 cm² ground plane. Derating applies above 60°C; at 85°C ambient, maximum continuous current drops to ~1.5A per SOA curves in the datasheet. This rating assumes proper thermal layout and use of recommended input/output capacitors and inductor.
Does the MIC4684BM-TR require external compensation components?
No, the MIC4684BM-TR features an internally compensated control loop. No external compensation network is needed-only the feedback resistors (R1/R2), input/output capacitors, inductor, and bootstrap capacitor are required for basic operation. This simplifies design and improves reliability across production lots.
Can the MIC4684BM-TR operate with a 5V input to produce 3.3V output?
Yes, the MIC4684BM-TR supports 5V→3.3V conversion using the feed-forward diode configuration described in the datasheet. This topology reduces effective headroom requirements, enabling stable regulation where standard buck operation would fail due to insufficient VIN–VOUT margin.
What is the purpose of the BS (bootstrap) pin on the MIC4684BM-TR?
The BS pin on the MIC4684BM-TR connects to an external 0.33µF capacitor that couples switching-node AC voltage to generate a boosted gate-drive voltage above VIN. This enhances NPN transistor saturation, lowering VCE(sat) from ~1.8V to 0.59V and increasing efficiency by up to 13 percentage points.
How does the MIC4684BM-TR handle short-circuit conditions?
The MIC4684BM-TR employs frequency-foldback short-circuit protection: when output is shorted, switching frequency reduces from 200kHz to 30–120kHz. This lowers energy per cycle, limiting power dissipation and preventing thermal runaway while maintaining hiccup-like recovery behavior without latching off.
MIC4684BM-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:
- Discontinued at Digi-Key
- 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
MIC4684BM-TR FAQ
1.How can I place an order for MIC4684BM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4684BM-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 MIC4684BM-TR reliable?
The price and inventory of MIC4684BM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4684BM-TR is usually 5 days.
3.What payment methods are accepted for MIC4684BM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4684BM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4684BM-TR?
MIC4684BM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4684BM-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 MIC4684BM-TR?
For technical support, including MIC4684BM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4684BM-TR requirements.
6.How does Aetrix verify that MIC4684BM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4684BM-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 MIC4684BM-TR meets industry standards.
7.What is the process for return or replacement of MIC4684BM-TR?
All MIC4684BM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4684BM-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 MIC4684BM-TR part is unused and in its original packaging.
Return procedure for MIC4684BM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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