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Microchip Technology MIC4680-1.8BM TR
- Part No.:
- MIC4680-1.8BM TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4680-1.8BM TR.pdf
- Description:
- IC REG BUCK 1.8V 1.3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
MIC4680-1.8BM TR from Micrel is a fixed-frequency 200kHz synchronous buck regulator in Power-SOIC-8 package, delivering up to 1.3A continuous output current with 1.8V fixed output voltage. It operates from 4V to 34V input, features internal compensation, cycle-by-cycle current limiting, and thermal shutdown-designed for compact, high-efficiency DC/DC conversion in industrial power rails and embedded systems.
For engineers reviewing the MIC4680-1.8BM TR datasheet, MIC4680-1.8BM TR pinout, MIC4680-1.8BM TR application, or MIC4680-1.8BM TR equivalent, key selection criteria include its 1.8V ±1% output accuracy, 2µA shutdown current, 90% peak efficiency at 1A, SOIC-8 thermal design with pins 5–8 as ground/power paddle, and compatibility with standard 68µH inductors and Schottky diodes.
Technical Context
The MIC4680-1.8BM TR implements voltage-mode PWM control using a 200kHz oscillator and a 1.23V internal bandgap reference. Feedback is internally tied to generate fixed 1.8V output-no external resistor divider required. Its integrated NPN switch and internal error amplifier enable stable regulation across 4V–34V input with <±0.5% load regulation at 1A.
Thermal protection activates at 160°C junction temperature, and frequency foldback (30–100kHz) engages during short-circuit events to limit energy per cycle. Shutdown logic is TTL-compatible: <0.8V enables regulation; >1.6V disables it, reducing quiescent current to 30µA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% - eliminates need for external feedback resistors; matches low-voltage logic supply requirements. |
| Input Voltage Range | 4V to 34V - supports wide-range industrial inputs including 12V, 24V, and 32V bus systems without pre-regulation. |
| Switching Frequency | 200kHz ±10% - enables use of standard off-the-shelf 68µH shielded inductors and minimizes EMI vs. higher-frequency alternatives. |
| Continuous Output Current | 1.3A - sustained delivery under full thermal derating with proper 6 cm² ground plane per Micrel layout guidelines. |
| Shutdown Current | 30µA typical at VSHDN = 5V - ensures ultra-low power-off state for battery-backed or energy-sensitive applications. |
| Efficiency | Up to 90% at 1A - achieved with low RDS(on)-equivalent saturation voltage (1.4V typ. at 1A) and optimized gate drive. |
| Thermal Shutdown Threshold | 160°C - provides robust fault protection while allowing operation up to +125°C junction temperature in normal mode. |
Pinout & Package
Package: Power-SOIC-8 (M), thermally enhanced with integrated die-attach paddle connected to pins 5–8 (GND). Designed for PCB ground-plane heat sinking; θJA = 63°C/W with minimum 6 cm² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | TTL-compatible enable: logic low (≤0.8V) activates regulator; logic high (≥1.6V) forces <30µA standby mode. |
| 2 IN (VIN) | Main power input | Accepts 4V–34V unregulated supply; requires local 15µF/35V ceramic+electrolytic bypass near pin 2 and GND pins. |
| 3 SW | Switch node output | Drives external inductor and Schottky diode (e.g., B260A); high dv/dt node requiring shortest possible trace routing. |
| 4 FB | Feedback reference | Internally connected to 1.8V divider - no external components needed; must be routed away from SW/L1/D1 to avoid noise coupling. |
| 5–8 GND | Power and signal ground | All four pins tied to internal paddle - must connect to large PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.8V output | Eliminates external resistor network - reduces BOM count, layout area, and calibration drift over temperature. |
| Internal frequency compensation | Enables stable operation with only 4 external components (inductor, diode, input/output caps) - no loop tuning required. |
| Power-SOIC-8 thermal design | Pins 5–8 + paddle form low-θJC (20°C/W) path - allows 1.3A continuous output with minimal heatsinking. |
| Cycle-by-cycle current limiting | 1.3A–2.5A short-circuit threshold - protects IC and external FETs during overload without latch-off or external sensing. |
| Frequency foldback under fault | Reduces switching frequency to 30–50kHz during hard short - limits peak switch stress and thermal runaway risk. |
Applications
| Industrial 12V-to-1.8V Point-of-Load | Embedded FPGA Core Supply |
|---|---|
Use Scenario: Converting 12V intermediate rail to 1.8V core voltage for microcontrollers or ASICs in factory automation controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise 1.8V supply with fast transient response to digital load steps. Use Value: Delivers 1.3A at 90% efficiency with <±1% output accuracy-reducing thermal load versus linear regulators and enabling smaller heatsinks. |
Use Scenario: Powering FPGA I/O banks or ARM Cortex-A series processors requiring clean, stable 1.8V at up to 1A in edge computing modules. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter supplying core logic voltage with integrated thermal shutdown and current limiting. Use Value: Internal compensation and SOIC-8 footprint simplify layout while meeting FPGA dynamic current demands and JEDEC thermal specs. |
| Automotive Body Control Module (BCM) | POS Terminal Power Management |
Use Scenario: Generating 1.8V for CAN transceiver logic or sensor interface ICs in 24V automotive BCMs with cold-crank tolerance. IC Role / Device Role / Timing Role: Input-rugged buck regulator operating down to 4V input-maintaining regulation during battery dips to 6V. Use Value: Wide 4V–34V input range and 160°C thermal shutdown ensure reliability across automotive temperature and voltage transients. |
Use Scenario: Providing 1.8V for smart card readers or display drivers in retail POS terminals powered from 12V wall adapters. IC Role / Device Role / Timing Role: Compact, cost-optimized step-down regulator replacing discrete solutions with fewer passives and smaller PCB area. Use Value: Only 4 external components and SOIC-8 footprint reduce assembly cost and accelerate time-to-market for volume consumer designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675-1.8/NOPB | 500kHz switching frequency; 1A max output; requires external compensation; wider input range (8V–40V). | Better suited for space-constrained designs needing higher frequency, but lower current capability and less thermal margin. | Select when board area is critical and 1A output suffices; verify stability with chosen inductor/capacitor. |
| TPS54202DR | 2.5V–17V input; 2A output; integrated MOSFETs; adjustable output only; requires external feedback resistors. | Supports higher current and tighter output adjustability but lacks fixed 1.8V option and needs more external components. | Choose for designs requiring >1.3A or programmable output; not drop-in for MIC4680-1.8BM TR's fixed-voltage simplicity. |
Compared with LM2675-1.8/NOPB and TPS54202DR, the MIC4680-1.8BM TR offers superior thermal performance in SOIC-8 via its dedicated ground paddle, fixed 1.8V output eliminating feedback tuning, and proven 1.3A capability with minimal external parts-making it optimal for rugged, medium-current industrial supplies where layout simplicity and thermal headroom are prioritized.
Availability
MIC4680-1.8BM TR is available at Aetrix Electronics and suitable for industrial power rails, embedded processor core supplies, and automotive body electronics requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for MIC4680-1.8BM 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 specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.
The MIC4680 family was developed as part of Micrel's SuperSwitcher™ line to deliver easy-to-use, thermally robust buck regulators targeting industrial and embedded applications needing high efficiency and minimal external components.
FAQ
What is the output voltage tolerance of the MIC4680-1.8BM TR?
The MIC4680-1.8BM TR delivers a fixed 1.8V output with ±1% tolerance over temperature and load conditions, as specified in the Electrical Characteristics table. This tight tolerance is maintained across the full –40°C to +125°C junction temperature range and 0.1A–1.3A output current, ensuring reliable operation for sensitive logic supplies without external trimming.
Does the MIC4680-1.8BM TR require external feedback resistors?
No, the MIC4680-1.8BM TR does not require external feedback resistors. Its FB pin is internally connected to a precision voltage divider calibrated for 1.8V output. Unlike adjustable versions (e.g., MIC4680BM), this variant simplifies design by eliminating resistor selection, placement, and tolerance-induced output drift-reducing BOM and layout complexity.
What is the recommended minimum ground plane area for the MIC4680-1.8BM TR?
Micrel specifies a minimum 6 cm² copper area connected to pins 5–8 (GND) for reliable 1.3A operation at maximum ambient temperature. This ground plane acts as the primary heat sink; larger areas further improve thermal performance. Layouts must ensure low-inductance connections between all four GND pins and the plane to maintain both thermal integrity and EMI control.
Can the MIC4680-1.8BM TR operate with a 3.3V input supply?
No, the MIC4680-1.8BM TR has a minimum input voltage of 4V, as defined in its Operating Ratings. A 3.3V supply falls below this threshold and will not enable regulation. For sub-4V inputs, consider alternative regulators such as the MIC2280 or Microchip's MCP16301 series, which support lower VIN ranges while maintaining 1.8V output capability.
How does the MIC4680-1.8BM TR handle short-circuit conditions?
The MIC4680-1.8BM TR employs cycle-by-cycle current limiting with a typical short-circuit current threshold of 1.3A–2.5A, plus frequency foldback that reduces switching frequency to 30–50kHz during sustained faults. This dual protection prevents thermal runaway and limits peak switch stress, allowing safe recovery once the fault is removed-without requiring external current-sense circuitry.
MIC4680-1.8BM 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:
- Obsolete
- 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):
- 1.8V
- 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
MIC4680-1.8BM TR FAQ
1.How can I place an order for MIC4680-1.8BM TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4680-1.8BM 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 MIC4680-1.8BM TR reliable?
The price and inventory of MIC4680-1.8BM TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4680-1.8BM TR is usually 5 days.
3.What payment methods are accepted for MIC4680-1.8BM TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4680-1.8BM TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4680-1.8BM TR?
MIC4680-1.8BM TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4680-1.8BM 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 MIC4680-1.8BM TR?
For technical support, including MIC4680-1.8BM TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4680-1.8BM TR requirements.
6.How does Aetrix verify that MIC4680-1.8BM TR is sourced from the original manufacturer or authorized distributors?
All MIC4680-1.8BM 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 MIC4680-1.8BM TR meets industry standards.
7.What is the process for return or replacement of MIC4680-1.8BM TR?
All MIC4680-1.8BM TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4680-1.8BM 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 MIC4680-1.8BM TR part is unused and in its original packaging.
Return procedure for MIC4680-1.8BM TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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