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Microchip Technology MIC4680-2.5BM
- Part No.:
- MIC4680-2.5BM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4680-2.5BM.pdf
- Description:
- IC REG BUCK 2.5V 1.3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,219
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Product details
Overview
MIC4680-2.5BM from Micrel is a fixed-frequency 200kHz synchronous buck regulator IC with internal NPN switch, delivering up to 1.3A continuous output at 2.5V from 4V–34V input. It integrates internal compensation, thermal shutdown, cycle-by-cycle current limiting, and operates in an 8-pin Power SOIC package rated for –40°C to +125°C junction temperature. Used in on-card DC/DC conversion for industrial power rails.
For engineers reviewing the MIC4680-2.5BM datasheet, MIC4680-2.5BM pinout, MIC4680-2.5BM application, or MIC4680-2.5BM equivalent, key selection criteria include input voltage range (4–34V), feedback reference (1.23V), shutdown quiescent current (<2µA), thermal shutdown threshold (160°C), and compatibility with standard 68µH inductors and Schottky diodes.
Technical Context
The MIC4680-2.5BM employs voltage-mode control architecture with a 200kHz oscillator and 1.23V bandgap reference. Its error amplifier compares FB voltage against this reference to generate duty-cycle-modulated PWM via comparator against a sawtooth waveform.
It features frequency foldback during short-circuit conditions (30–100kHz), cycle-by-cycle current limiting (1.3–2.5A), and thermal shutdown at 160°C. The internal NPN switch has saturation voltage of 1.4–1.8V at 1A, requiring external Schottky diode and storage inductor for buck topology operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±3% over load (0.1–1A) and line (6–34V) variations |
| Switching Frequency | 200kHz ±10% - enables compact magnetics and predictable EMI profile |
| Input Voltage Range | 4V to 34V - supports wide industrial input sources including 12V/24V rails and battery-backed systems |
| Max Output Current | 1.3A continuous - limited by thermal design and ground-plane layout per θJA = 63°C/W |
| Feedback Reference | 1.23V - sets output via external resistor divider; used to derive 2.5V using R1=3.01kΩ, R2=2.915kΩ |
| Shutdown Current | 30µA typical at VSHDN = 5V - ensures ultra-low standby power in battery-sensitive applications |
| Thermal Shutdown | 160°C - protects die under overload or poor PCB heat sinking; auto-recovery after cooldown |
Pinout & Package
Package: 8-pin Power SOIC (M) with integrated thermal paddle connected to pins 5–8 (GND). Designed for enhanced thermal dissipation via PCB ground plane attachment (min. 6 cm² recommended).
| 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 <30µA standby draw |
| 2 (VIN) | Main power input | Accepts unregulated 4–34V supply; requires local 15µF/35V ceramic or tantalum bypass capacitor |
| 3 (SW) | Switch node output | Drives external inductor and Schottky diode; connects to L1 and D1 anode; high dv/dt node requiring short trace routing |
| 4 (FB) | Feedback input | Monitors output via resistive divider; for 2.5V version, internally tied to divider yielding 1.23V at FB pin |
| 5–8 (GND) | Power and signal ground | All four pins bonded to thermal paddle - must be soldered to large PCB ground plane for thermal integrity and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates external compensation components; stable with 68µH inductor and 220µF output capacitor |
| Voltage-mode PWM architecture | Provides predictable transient response and straightforward loop analysis vs. current-mode alternatives |
| Frequency foldback under fault | Reduces switching frequency to 30–100kHz during short-circuit, lowering peak switch stress and thermal buildup |
| Thermal shutdown with hysteresis | Triggers at 160°C and releases ~10–15°C below; prevents thermal runaway without oscillation |
| Low shutdown quiescent current | 30µA max at 5V SHDN - enables long-term battery hold-up in always-on monitoring circuits |
Applications
| Industrial 24V-to-2.5V Point-of-Load | Programmable Logic Controller I/O Rail |
|---|---|
Use Scenario: Converting 24V field bus supply to clean 2.5V for FPGA configuration memory or microcontroller I/O banks. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 2.5V/1.3A with fast load-step response and low ripple. Use Value: Replaces discrete controller + MOSFET solutions with single IC, reducing BOM count and layout area while maintaining >85% efficiency at full load. | Use Scenario: Powering digital input/output modules in PLC backplanes where 2.5V logic interfaces with isolated sensors and actuators. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter supplying noise-immune 2.5V rail referenced to system ground. Use Value: Delivers stable output across wide input transients (e.g., 18–32V brownouts) due to robust line regulation (<0.02%/V) and thermal protection. |
| Battery-Powered Test Equipment | Automated Test Fixture Power |
Use Scenario: Portable calibration tool powered by Li-ion (8.4–12.6V) requiring precise 2.5V reference for ADC biasing. IC Role / Device Role / Timing Role: Efficient pre-regulator stepping down battery voltage prior to low-noise LDO post-regulation. Use Value: Achieves >88% efficiency at 500mA, extending runtime; shutdown mode draws <30µA enabling multi-week standby without battery drain. | Use Scenario: Benchtop test fixture powering mixed-signal DUTs with 2.5V core voltage requirements and variable load profiles. IC Role / Device Role / Timing Role: High-current buck stage delivering 2.5V/1A with fast transient recovery (<50µs) for pulsed digital loads. Use Value: Maintains ±1.5% output accuracy under 100mA–1.3A step loads due to internal compensation and 200kHz bandwidth. |
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 | 5-pin TO-220 or SOIC-8; 100kHz switching; requires external compensation; 2.5V fixed output | Lower switching frequency increases inductor size; less efficient at light loads due to higher quiescent current (50mA vs. 7mA) | Choose LM2678-2.5 only if legacy footprint compatibility or lower EMI priority outweighs size/efficiency needs. |
| TPS54202DRT | 2A synchronous buck; 400kHz–2.5MHz adjustable frequency; integrated high-side/low-side FETs; 2.5V adjustable via resistor divider | Higher integration eliminates external diode; supports smaller inductors but requires careful layout for EMI control | Choose TPS54202DRT when board space is constrained and 2A capability or programmable frequency is required. |
Compared with LM2678-2.5 and TPS54202DRT, the MIC4680-2.5BM offers optimal balance of simplicity (4 external components), thermal robustness (power-SOIC-8 with dedicated GND paddle), and proven industrial reliability - especially where fixed 200kHz operation and sub-30µA shutdown current are critical.
Availability
MIC4680-2.5BM is available at Aetrix Electronics and suitable for industrial automation, programmable logic controllers, and portable test equipment requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for MIC4680-2.5BM 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-reliability power management and interface ICs.
The MIC4680 family was designed as an easy-to-use, thermally robust buck regulator series targeting industrial and embedded applications needing simple, high-current DC/DC conversion without external compensation.
FAQ
What is the recommended inductor value for MIC4680-2.5BM in a standard buck application?
The MIC4680-2.5BM is characterized and optimized for use with a 68µH shielded or non-shielded inductor rated for ≥1.5A saturation current. Coiltronics UP2B-680 and Sumida CDRH124-680MC are validated options. Using values outside 56–100µH may degrade transient response or stability margin.
Does MIC4680-2.5BM require an external Schottky diode, and why?
Yes, MIC4680-2.5BM requires an external Schottky diode (e.g., B260A or SS26) because it integrates only an NPN switch - not a synchronous rectifier. The diode provides the freewheeling path during the off-time of the internal switch, preventing reverse current and enabling proper buck operation.
Can MIC4680-2.5BM operate with input voltage below 4V?
No - the MIC4680-2.5BM has a minimum specified input voltage of 4V per absolute ratings and operating conditions. Attempting operation below 4V risks failure to start, unstable regulation, or undefined behavior due to insufficient headroom for the internal regulator and switch drive circuitry.
How is the 2.5V output set in MIC4680-2.5BM, and is external resistor adjustment possible?
The MIC4680-2.5BM uses an internal resistor divider to fix the output at 2.5V, referencing the 1.23V bandgap. External resistor adjustment is not supported - unlike the MIC4680BM adjustable version. The FB pin is internally connected; adding external resistors will disrupt regulation and is not recommended.
What PCB layout practices are essential to ensure thermal reliability of MIC4680-2.5BM?
To ensure thermal reliability, MIC4680-2.5BM pins 5–8 (GND) must be soldered to a minimum 6 cm² copper ground plane on the PCB - preferably on inner layers with multiple vias. Avoid thermal relief on these pads. Keep high-current traces (VIN, SW, GND) short and wide, and place input capacitor (15µF/35V) within 5 mm of pins 2 and 5–8.
MIC4680-2.5BM 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):
- 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 FAQ
1.How can I place an order for MIC4680-2.5BM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4680-2.5BM 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 reliable?
The price and inventory of MIC4680-2.5BM 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 is usually 5 days.
3.What payment methods are accepted for MIC4680-2.5BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4680-2.5BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4680-2.5BM?
MIC4680-2.5BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4680-2.5BM 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?
For technical support, including MIC4680-2.5BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4680-2.5BM requirements.
6.How does Aetrix verify that MIC4680-2.5BM is sourced from the original manufacturer or authorized distributors?
All MIC4680-2.5BM 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 meets industry standards.
7.What is the process for return or replacement of MIC4680-2.5BM?
All MIC4680-2.5BM units undergo pre-shipment inspection (PSI). If there is an issue with MIC4680-2.5BM, 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 part is unused and in its original packaging.
Return procedure for MIC4680-2.5BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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