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Microchip Technology MIC4680-1.8BM
- Part No.:
- MIC4680-1.8BM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4680-1.8BM.pdf
- Description:
- IC REG BUCK 1.8V 1.3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,579
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Product details
Overview
MIC4680-1.8BM from Micrel is a fixed-frequency 200kHz synchronous buck regulator in SOIC-8 package, delivering up to 1.3A continuous output current with 1.8V fixed output voltage. It operates from 4V–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.
For engineers reviewing the MIC4680-1.8BM datasheet, MIC4680-1.8BM pinout, MIC4680-1.8BM application, or MIC4680-1.8BM equivalent, key selection criteria include its 1.8V ±1% output accuracy, 2µA shutdown quiescent current, 90% peak efficiency at 1A, and compatibility with standard 68µH inductors and Schottky diodes in space-constrained designs.
Technical Context
The MIC4680-1.8BM implements voltage-mode control using a 1.23V internal bandgap reference and 200kHz oscillator. Its error amplifier compares FB voltage against 1.23V to generate duty-cycle-modulated PWM driving an integrated NPN switch with 1.4V saturation voltage at 1A.
It integrates frequency foldback during short-circuit events (reducing switching frequency to 30–100kHz), supports external feedback resistor networks for adjustable variants, and relies on pins 5–8 as low-thermal-resistance ground paths for junction-to-ambient heat dissipation (θJA = 63°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±1% - tightly regulated rail for low-voltage logic or analog circuitry requiring stable bias. |
| Input Voltage Range | 4V to 34V - supports wide-input industrial, automotive, and telecom supply buses without pre-regulation. |
| Switching Frequency | 200kHz ±10% - enables use of standard off-the-shelf 68µH inductors and minimizes EMI filtering complexity. |
| Max Output Current | 1.3A continuous - sufficient for powering FPGAs, microcontrollers, or sensor interfaces with margin. |
| Shutdown Current | <2µA typical - preserves battery life in always-on systems or standby modes. |
| Efficiency | Up to 90% at 1A - reduces thermal load and improves system-level power density vs. linear regulators. |
| Thermal Shutdown | 160°C - protects device under overload or poor PCB heatsinking conditions. |
Pinout & Package
Package: 8-pin Power-SOIC (M) with exposed die-attach paddle connected to pins 5–8; rated for –40°C to +125°C junction temperature and optimized for low θJA via ground-plane thermal coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | TTL-compatible enable: logic low (≤0.8V) activates regulator; logic high (≥1.6V) disables with <2µA draw. |
| 2 (IN) | Main power input | Accepts 4V–34V unregulated supply; requires local 15µF/35V ceramic or tantalum bypass capacitor. |
| 3 (SW) | Switch node output | Drives external storage inductor and Schottky diode; high dv/dt node requiring short trace routing. |
| 4 (FB) | Feedback input | Internally tied to 1.8V divider; no external resistors needed-enables plug-and-play 1.8V regulation. |
| 5–8 (GND) | Power and signal ground | Common ground return path with integrated thermal paddle; must connect to ≥6 cm² PCB ground plane for full 1.3A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.8V output | Eliminates external feedback resistors-reduces BOM count and layout sensitivity for dedicated 1.8V rails. |
| Internal compensation | Enables stable operation with only 4 external components (inductor, diode, input/output caps) and no loop-tuning effort. |
| Frequency foldback | Reduces switching frequency under short-circuit to limit per-cycle energy and prevent thermal runaway. |
| Thermal shutdown + OCP | Combines 160°C junction cutoff and 1.3–2.5A cycle-by-cycle current limiting for robust fault handling. |
| Power-SOIC-8 package | Delivers 1.3A capability in footprint identical to standard SOIC-8-no redesign needed when upgrading from linear regulators. |
Applications
| Industrial PLC I/O Module | FPGA Core Voltage Supply |
|---|---|
Use Scenario: Providing clean 1.8V core power to Xilinx Spartan-7 FPGA banks in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 12V backplane to 1.8V FPGA VCCINT rail with fast transient response. Use Value: Delivers 1.3A with <1% output deviation across load steps-meets Spartan-7 VCCINT ripple and settling time requirements. | Use Scenario: Generating 1.8V for ARM Cortex-M7 microcontroller cores in edge AI gateways. IC Role / Device Role / Timing Role: Fixed-output step-down converter replacing inefficient LDOs in battery-backed embedded systems. Use Value: 90% efficiency at 1A extends runtime by >3× versus 3.3V→1.8V LDO; 2µA shutdown enables multi-week deep-sleep operation. |
| Automotive Body Control Unit | Industrial Sensor Signal Chain |
Use Scenario: Powering CAN transceiver and LIN interface ICs in 12V vehicle body modules. IC Role / Device Role / Timing Role: High-reliability 1.8V rail generator tolerant of 34V load-dump transients and –40°C cold cranking. Use Value: 4V–34V input range and 125°C junction rating ensure uninterrupted operation across automotive environmental extremes. | Use Scenario: Supplying precision ADCs and op-amps in 4–20mA transmitter modules. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 1.8V source minimizing PSRR-induced measurement errors. Use Value: 1.8V ±1% accuracy and internal compensation yield <5mV line/load regulation-critical for 16-bit analog accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DJ-LF-Z | 3A rated, 500kHz switching, requires external compensation; no integrated thermal shutdown hysteresis. | Better suited for higher-current, smaller-inductor designs but demands more layout expertise. | Select when >1.3A output or faster transient response is required; verify thermal management for 125°C ambient. |
| LM2678SX-1.8/NOPB | 1A rated, 260kHz, external feedback resistors required; higher 5mA quiescent current in active mode. | Lower cost for low-volume production but lacks MIC4680-1.8BM's integrated 1.8V divider and ultra-low shutdown current. | Choose for legacy TI-based designs where pin compatibility isn't required and 2µA shutdown isn't critical. |
Compared with MP2307DJ-LF-Z and LM2678SX-1.8/NOPB, the MIC4680-1.8BM offers superior integration (no FB resistors), lowest shutdown current, and proven thermal reliability in SOIC-8-making it optimal for space- and power-constrained industrial applications demanding drop-in simplicity.
Availability
MIC4680-1.8BM is available at Aetrix Electronics and suitable for industrial PLCs, FPGA power supplies, automotive body controllers, and precision sensor modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MIC4680-1.8BM 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 power management, analog, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC4680 family was developed as part of Micrel's SuperSwitcher™ series to deliver high-current, easy-to-use buck regulators in thermally enhanced SOIC packages for industrial and embedded power conversion.
FAQ
What is the output voltage tolerance of the MIC4680-1.8BM over temperature and load?
The MIC4680-1.8BM maintains 1.8V output with ±1% initial accuracy at 25°C and ±3% over –40°C to +125°C junction temperature and 0.1A–1A load range, as verified in the Electrical Characteristics table under "MIC4680-1.8" test conditions. This ensures reliable operation for 1.8V logic and analog circuits without external trimming.
Does the MIC4680-1.8BM require external feedback resistors to set the output voltage?
No. The MIC4680-1.8BM is a fixed-output variant with internal resistor divider configured for 1.8V; the FB pin is internally connected and requires no external components. This eliminates resistor matching errors and simplifies layout versus adjustable versions like MIC4680BM.
Can the MIC4680-1.8BM operate from a 3.3V input supply?
No. The MIC4680-1.8BM has a minimum input voltage of 4V per Absolute Maximum Ratings and Operating Ratings. A 3.3V input falls below VIN(min) = VOUT + 2.5V = 4.3V, so it cannot regulate 1.8V output reliably-use a different topology such as a buck-boost or low-VIN PMIC.
What thermal design guidance applies to the MIC4680-1.8BM for 1.3A continuous operation?
For full 1.3A output, MIC4680-1.8BM requires connection of pins 5–8 to ≥6 cm² copper ground plane per Micrel's Thermal Considerations section. Without this, junction temperature exceeds 125°C under load; thermal shutdown will activate. Use multiple vias under the exposed paddle if multilayer PCB is used.
Is the MIC4680-1.8BM pin-compatible with other MIC4680 variants like MIC4680-3.3BM?
Yes. All MIC4680 variants-including MIC4680-1.8BM, MIC4680-3.3BM, and MIC4680BM-share identical 8-pin SOIC (M) pinout and mechanical footprint. Only the internal feedback network differs; no PCB layout change is needed when substituting between fixed-output versions.
MIC4680-1.8BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SuperSwitcher™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MIC4680-1.8BM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4680-1.8BM 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 reliable?
The price and inventory of MIC4680-1.8BM 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 is usually 5 days.
3.What payment methods are accepted for MIC4680-1.8BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4680-1.8BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4680-1.8BM?
MIC4680-1.8BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4680-1.8BM 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?
For technical support, including MIC4680-1.8BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4680-1.8BM requirements.
6.How does Aetrix verify that MIC4680-1.8BM is sourced from the original manufacturer or authorized distributors?
All MIC4680-1.8BM 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 meets industry standards.
7.What is the process for return or replacement of MIC4680-1.8BM?
All MIC4680-1.8BM units undergo pre-shipment inspection (PSI). If there is an issue with MIC4680-1.8BM, 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 part is unused and in its original packaging.
Return procedure for MIC4680-1.8BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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