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Microchip Technology MIC4680-2.5BM TR
- Part No.:
- MIC4680-2.5BM TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4680-2.5BM TR.pdf
- Description:
- IC REG BUCK 2.5V 1.3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,078
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Product details
Overview
MIC4680-2.5BM TR from Micrel is a fixed-frequency 200 kHz synchronous-buck switching regulator IC with 2.5 V output, integrated NPN power switch, and internal compensation. It delivers up to 1.3 A continuous output current across a 4 V to 34 V input range in an 8-pin Power SOIC package, and is used in compact, high-efficiency DC/DC conversion for industrial power rails and embedded subsystems.
For engineers reviewing the MIC4680-2.5BM TR datasheet, MIC4680-2.5BM TR pinout, MIC4680-2.5BM TR application, or MIC4680-2.5BM TR equivalent, key selection criteria include its 2.5 V fixed output accuracy (±1%), shutdown quiescent current (<2 µA), thermal shutdown at 160°C, and compatibility with standard 68 µH inductors and Schottky diodes in minimal-component buck designs.
Technical Context
The MIC4680-2.5BM TR implements voltage-mode control using a 200 kHz oscillator and a 1.23 V bandgap reference. Its error amplifier compares feedback voltage against this reference to generate duty-cycle-modulated PWM drive for the internal NPN switch.
It features cycle-by-cycle current limiting (1.3–2.5 A trip threshold), thermal shutdown at 160°C, and frequency foldback during short-circuit conditions to limit energy per cycle. Shutdown logic is TTL-compatible with 0.8 V low-enable and 1.6 V high-disable thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1% - stable regulation without external resistors; matches common logic supply rails. |
| Switching Frequency | 200 kHz ±10% - enables use of standard off-the-shelf 68 µH inductors and reduces EMI vs. higher frequencies. |
| Input Voltage Range | 4 V to 34 V - supports wide-range industrial inputs including 12 V, 24 V, and 32 V bus systems. |
| Continuous Output Current | 1.3 A - sufficient for powering microcontrollers, FPGAs, and analog circuitry without external FETs. |
| Shutdown Quiescent Current | 30 µA typical at VSHDN = 5 V - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Thermal Shutdown Threshold | 160°C - protects device under overload or poor PCB thermal design while allowing operation up to +125°C junction. |
| Feedback Reference Voltage | 1.23 V - internal precision bandgap reference used for error amplification and output regulation stability. |
Pinout & Package
Package: 8-pin Power SOIC (SOIC-8 with exposed thermal paddle; pins 5–8 internally connected to GND and die attach paddle for enhanced thermal performance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | TTL-compatible enable: logic low (≤0.8 V) activates regulator; logic high (≥1.6 V) disables it, reducing IQ to <2 µA. |
| 2 (IN) | Main power input | Accepts unregulated 4–34 V DC; connects to input capacitor (CIN) and must be routed with low-inductance path to GND pins 5–8. |
| 3 (SW) | Switch node output | Drives external inductor and Schottky diode; carries high di/dt; requires tight layout to minimize ringing and EMI. |
| 4 (FB) | Feedback input | Internally tied to 2.5 V output divider; no external resistors needed - simplifies layout and improves accuracy vs. adjustable versions. |
| 5–8 (GND) | Ground terminals | All four pins are electrically common and thermally connected to die paddle; must be soldered to large PCB ground plane (≥6 cm²) for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates external compensation components; ensures stability with 68 µH inductor and 220 µF output capacitor per typical application. |
| Power SOIC-8 thermal architecture | Pins 5–8 and die paddle form unified thermal path; achieves θJA = 63°C/W with proper ground plane - 2× better dissipation than standard SOIC-8. |
| Fixed 200 kHz switching frequency | Enables predictable EMI filtering and consistent inductor sizing; avoids audible noise and simplifies EMC compliance testing. |
| Cycle-by-cycle overcurrent protection | Current limit trips at 1.3–2.5 A depending on VIN; prevents damage during startup, short-circuit, or transient overload. |
| Frequency foldback under fault | Reduces switching frequency to 30–100 kHz during hard short, lowering peak switch stress and thermal runaway risk. |
Applications
| Industrial 24V-to-2.5V Point-of-Load | Embedded Microcontroller Core Supply |
|---|---|
|
Use Scenario: Converting 24 V industrial bus to clean 2.5 V for FPGA I/O banks or sensor interface circuitry in factory automation controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 2.5 V rail with fast transient response to handle digital load steps. Use Value: Delivers 1.3 A at >85% efficiency with only 4 external components, eliminating need for heatsinks or complex thermal management. |
Use Scenario: Powering ARM Cortex-M7 core voltage in portable test equipment requiring low-noise, low-quiescent operation. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter supplying processor core rail with precise 2.5 V ±1% tolerance and <2 µA shutdown current. Use Value: Enables deep-sleep modes with minimal battery drain while maintaining fast wake-up capability via TTL-compatible SHDN pin. |
| Programmable Logic Controller (PLC) Auxiliary Rail | Industrial IoT Sensor Node Power |
|
Use Scenario: Generating isolated 2.5 V auxiliary supply for analog front-end ADCs and DACs in modular PLC backplanes. IC Role / Device Role / Timing Role: High-reliability buck regulator operating continuously across –40°C to +125°C junction temperature range. Use Value: Maintains regulation stability over wide input (4–34 V) and temperature extremes, with thermal shutdown preventing field failures. |
Use Scenario: Powering LoRaWAN or NB-IoT sensor nodes powered by 12 V solar-charged batteries with intermittent load profiles. IC Role / Device Role / Timing Role: Efficient step-down regulator enabling long battery life through low 30 µA shutdown current and high light-load efficiency. Use Value: Achieves >75% efficiency at 10 mA load (per typical curves), extending operational lifetime without compromising RF sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-2.5/NOPB | 5 A output, 260 kHz, requires external compensation; larger SOIC-8 footprint but higher current rating. | Suitable for higher-current loads where 1.3 A is insufficient; less optimized for minimal-component designs. | Choose when >1.3 A output or wider input range (up to 40 V) is required; adds complexity due to external compensation network. |
| TPS54202DDCR | 2 A output, 400–2200 kHz adjustable frequency, integrated MOSFETs, requires external feedback resistors. | Better suited for space-constrained designs needing higher frequency and smaller magnetics; lacks fixed 2.5 V option. | Prefer when board area is critical and adjustable output or programmable frequency is acceptable; not drop-in for 2.5 V fixed use. |
Compared with LM2678-2.5/NOPB and TPS54202DDCR, the MIC4680-2.5BM TR offers the simplest implementation for 2.5 V fixed-output applications - requiring zero external feedback components, delivering proven 1.3 A performance in a thermally robust Power SOIC-8, and supporting industrial temperature and input voltage ranges without design iteration.
Availability
MIC4680-2.5BM TR is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller subsystems, and sensor node designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MIC4680-2.5BM 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 designed as a cost-optimized, easy-to-use buck regulator series targeting industrial and embedded applications needing reliable 1 A+ DC/DC conversion with minimal external parts and robust thermal behavior.
FAQ
What is the output voltage tolerance of the MIC4680-2.5BM TR?
The MIC4680-2.5BM TR provides a fixed 2.5 V output with ±1% initial tolerance over temperature and line/load conditions. This specification is verified across the full –40°C to +125°C junction temperature range and 4 V to 34 V input voltage range, ensuring consistent regulation for precision analog and digital loads without trimming or calibration.
Does the MIC4680-2.5BM TR require external feedback resistors?
No. The MIC4680-2.5BM TR integrates the feedback voltage divider internally, so no external resistors are needed to set the 2.5 V output. Pin 4 (FB) is internally connected to the output, unlike the adjustable MIC4680BM version which requires R1/R2 to configure VOUT. This eliminates resistor matching errors and saves board space.
What thermal design considerations apply to the MIC4680-2.5BM TR?
The MIC4680-2.5BM TR uses a Power SOIC-8 package where pins 5–8 and the die-attach paddle are electrically and thermally common. To maintain safe junction temperature, these pins must connect to ≥6 cm² of copper ground plane. Thermal resistance drops from 63°C/W (typical) to lower values with increased copper area, directly impacting maximum sustainable output current.
Can the MIC4680-2.5BM TR operate with input voltages below 4 V?
No. The MIC4680-2.5BM TR has a minimum specified input voltage of 4 V, and operation below this level is not guaranteed. Additionally, the required headroom is VOUT + 2.5 V - meaning at 2.5 V output, the absolute minimum functional input is 5.0 V. Attempting operation below 4 V may result in dropout, regulation loss, or undefined behavior.
How does the MIC4680-2.5BM TR behave during output short-circuit events?
During a hard short-circuit, the MIC4680-2.5BM TR activates frequency foldback, reducing switching frequency from 200 kHz to 30–100 kHz. This lowers energy per cycle and limits average power dissipation. Combined with cycle-by-cycle current limiting (1.3–2.5 A) and thermal shutdown at 160°C, it provides robust fault protection without external circuitry.
MIC4680-2.5BM 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):
- 2.5V
- 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
MIC4680-2.5BM TR FAQ
1.How can I place an order for MIC4680-2.5BM TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4680-2.5BM 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 MIC4680-2.5BM TR reliable?
The price and inventory of MIC4680-2.5BM TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4680-2.5BM TR is usually 5 days.
3.What payment methods are accepted for MIC4680-2.5BM TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4680-2.5BM TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4680-2.5BM TR?
MIC4680-2.5BM TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4680-2.5BM 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 MIC4680-2.5BM TR?
For technical support, including MIC4680-2.5BM TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4680-2.5BM TR requirements.
6.How does Aetrix verify that MIC4680-2.5BM TR is sourced from the original manufacturer or authorized distributors?
All MIC4680-2.5BM 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 MIC4680-2.5BM TR meets industry standards.
7.What is the process for return or replacement of MIC4680-2.5BM TR?
All MIC4680-2.5BM TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4680-2.5BM 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 MIC4680-2.5BM TR part is unused and in its original packaging.
Return procedure for MIC4680-2.5BM TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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