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Microchip Technology MIC4680BM-TR
- Part No.:
- MIC4680BM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4680BM-TR.pdf
- Description:
- IC REG BUCK ADJ 1.3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,799
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Product details
Overview
MIC4680BM-TR from Micrel is an adjustable-output, 1.3A continuous current, 200kHz fixed-frequency buck regulator in Power-SOIC-8 package, operating from 4V to 34V input and delivering regulated output down to 1.25V via external resistor divider - used in industrial power supplies, battery chargers, and on-card DC/DC conversion.
For engineers reviewing the MIC4680BM-TR datasheet, MIC4680BM-TR pinout, MIC4680BM-TR application, or MIC4680BM-TR equivalent, key selection criteria include its internal 1.23V reference accuracy (±1%), thermal shutdown at 160°C, 93–97% max duty cycle, <2µA shutdown current, and compatibility with standard 68µH inductors and Schottky diodes in compact layouts.
Technical Context
The MIC4680BM-TR implements voltage-mode control using a 1.23V bandgap reference and 200kHz sawtooth oscillator; feedback error amplification drives PWM duty cycle with cycle-by-cycle current limiting and frequency foldback during short-circuit events. It integrates a 1A NPN switch with 1.4–1.8V saturation voltage at 1A load.
Thermal management relies on the Power-SOIC-8's low θJA (63°C/W) achieved via shared metal paddle and pins 5–8 as ground thermal path; junction temperature must remain ≤125°C under full load, with thermal shutdown activating at 160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.3A continuous - supports 1A typical loads with margin for transient peaks and thermal derating. |
| Input Voltage Range | 4V to 34V - enables direct operation from 5V, 12V, 24V, and 32V rails without pre-regulation. |
| Feedback Reference | 1.23V ±1% - sets output voltage via R1/R2 divider; enables precise 1.25V–34V adjustable regulation. |
| Switching Frequency | 200kHz ±10% - balances EMI, inductor size, and efficiency; folds back to 30–100kHz under short-circuit. |
| Shutdown Current | ≤100µA typical - ensures ultra-low standby power in battery-backed or energy-sensitive systems. |
| Thermal Shutdown | 160°C - protects die during overload or poor PCB heatsinking; auto-recovery after cooldown. |
| Duty Cycle Limit | 93–97% - allows high step-down ratios (e.g., 34V→3.3V) while maintaining stability and headroom. |
Pinout & Package
Package: Power-SOIC-8 (M), with integrated thermal paddle connected to pins 5–8 (GND); rated for –40°C to +125°C junction temperature and optimized for PCB ground-plane heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | TTL-compatible logic input: <0.8V enables regulator; >1.6V disables it with <100µA quiescent draw. |
| 2 (VIN) | Main power input | Accepts 4–34V unregulated supply; requires local 15µF/35V ceramic or tantalum bypass capacitor. |
| 3 (SW) | Internal switch emitter output | Drives external inductor and Schottky diode; handles peak currents up to 2.5A during current limit. |
| 4 (FB) | Feedback sensing node | Monitors output via resistive divider; 1.23V reference sets regulation point; sensitive to noise and layout. |
| 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. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates external compensation components; stable with 68µH inductor and 220µF output capacitor. |
| Power-SOIC-8 thermal design | θJA = 63°C/W with proper ground plane; enables 1.3A continuous output without heatsink. |
| Cycle-by-cycle overcurrent protection | Current limit threshold of 1.3–2.5A prevents damage during startup, short, or overload conditions. |
| Frequency foldback under fault | Reduces switching frequency to 30–100kHz during hard short, lowering stress and power dissipation. |
| Wide input range with fast transient response | Maintains ±1% line/load regulation across 4–34V input and 0–1A load steps (typ. <100µs recovery). |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
Use Scenario: On-board 12V-to-3.3V/1A conversion for PLC I/O modules requiring high reliability and wide input tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and thermally robust DC/DC conversion. Use Value: Delivers 90% efficiency at 1A with no external compensation, reducing BOM count and layout complexity. |
Use Scenario: Constant-voltage/constant-current stage in Li-ion charger for portable medical devices. IC Role / Device Role / Timing Role: Adjustable-output buck controller regulating charging voltage (e.g., 4.2V) and limiting charge current. Use Value: 1.23V reference accuracy and tight load regulation ensure ±1% CV precision critical for cell longevity. |
| On-Card DC/DC Converter | Negative Output Generation |
Use Scenario: Point-of-load regulation on dense compute cards where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing TO-220-based solutions. Use Value: Power-SOIC-8 footprint saves >60% board area vs. through-hole alternatives while supporting 1.3A. |
Use Scenario: Generating –5V rail from +12V supply in analog sensor interface circuits. IC Role / Device Role / Timing Role: Inverting buck-boost configuration using MIC4680BM-TR with external diode and inductor. Use Value: Fixed 200kHz operation simplifies filter design; internal current limit protects during polarity reversal transients. |
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, higher quiescent current (5mA), no frequency foldback, SOIC-8 but standard thermal resistance (θJA ≈ 75°C/W). | Better light-load efficiency at high frequency; less robust under sustained short-circuit due to lack of foldback. | Prefer when faster transient response is needed and thermal margin is available. |
| TPS54202DR | 2.5V–17V input, 400kHz, integrated high-side FET, 2A output, smaller 8-pin SO-PowerPAD package. | Higher integration reduces external component count; narrower input range excludes 24V/34V use cases. | Choose for space-constrained designs with ≤17V input and need for higher current headroom. |
Compared with LM2678-ADJ/NOPB and TPS54202DR, the MIC4680BM-TR offers superior wide-input capability (4–34V), lower shutdown current (<100µA), and built-in fault protection including frequency foldback - making it optimal for industrial and battery-fed systems demanding ruggedness and simplicity.
Availability
MIC4680BM-TR is available at Aetrix Electronics and suitable for industrial power supplies, battery charging circuits, and on-card DC/DC converters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC4680BM-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 and timing solutions.
The MIC4680BM-TR belongs to Micrel's SuperSwitcher™ family of integrated buck regulators, designed specifically for simple, high-efficiency, wide-input DC/DC conversion in industrial and embedded systems where minimal external components and thermal resilience are critical.
FAQ
What is the minimum input voltage required for MIC4680BM-TR to regulate a 3.3V output?
The MIC4680BM-TR requires VIN ≥ VOUT + 2.5V per datasheet specification, so minimum input for 3.3V output is 5.8V. However, absolute minimum operating VIN is 4V - meaning 3.3V regulation is only guaranteed above 5.8V. Below that, dropout occurs and output collapses. Always verify with actual load and thermal conditions in final design.
Can MIC4680BM-TR be used in a negative-output (inverting) configuration?
Yes - the MIC4680BM-TR supports inverting buck-boost topology per Application Note AN-37 and Figure 8 in its datasheet, generating negative outputs (e.g., –12V from +12V). The SW pin becomes the switching node referenced to output ground, requiring careful layout and Schottky diode selection to maintain efficiency and stability.
Does MIC4680BM-TR require external compensation components?
No - the MIC4680BM-TR features fully internal frequency compensation optimized for standard 68µH inductors and 220µF output capacitors. This eliminates external RC networks, reduces design risk, and ensures stability across –40°C to +125°C without tuning.
What is the maximum achievable output current for MIC4680BM-TR at 24V input?
At 24V input, maximum continuous output current is thermally limited. With proper 6 cm² ground plane, MIC4680BM-TR delivers 1.3A continuously. Derating applies above ambient >60°C; Figure 3 in the datasheet shows ~0.9A max at 24V with 6 cm² ground plane and TA = 70°C.
How does the shutdown function behave on MIC4680BM-TR?
The SHDN pin on MIC4680BM-TR is TTL-compatible: logic low (<0.8V) enables regulation; logic high (>1.6V) disables it, reducing quiescent current to ≤100µA. Hysteresis between 0.8V and 1.6V prevents chatter near threshold. Pin must be pulled low or grounded if unused.
MIC4680BM-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):
- 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
MIC4680BM-TR FAQ
1.How can I place an order for MIC4680BM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4680BM-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 MIC4680BM-TR reliable?
The price and inventory of MIC4680BM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4680BM-TR is usually 5 days.
3.What payment methods are accepted for MIC4680BM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4680BM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4680BM-TR?
MIC4680BM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4680BM-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 MIC4680BM-TR?
For technical support, including MIC4680BM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4680BM-TR requirements.
6.How does Aetrix verify that MIC4680BM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4680BM-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 MIC4680BM-TR meets industry standards.
7.What is the process for return or replacement of MIC4680BM-TR?
All MIC4680BM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4680BM-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 MIC4680BM-TR part is unused and in its original packaging.
Return procedure for MIC4680BM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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