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Microchip Technology MIC4681-5.0BM TR
- Part No.:
- MIC4681-5.0BM TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4681-5.0BM TR.pdf
- Description:
- IC REG BUCK 5V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
MIC4681-5.0BM TR from Micrel is a fixed-output 5.0V, 200kHz voltage-mode buck regulator in an 8-lead SOP package, delivering up to 1A continuous output current from a 4V–30V input range. It integrates an NPN power switch, internal compensation, thermal shutdown, and cycle-by-cycle current limiting-designed specifically for GSM battery chargers and compact high-efficiency DC/DC conversion.
For engineers reviewing the MIC4681-5.0BM TR datasheet, MIC4681-5.0BM TR pinout, MIC4681-5.0BM TR application, or MIC4681-5.0BM TR equivalent, key selection criteria include its fixed 5.0V output, 2.1A minimum current limit, <6µA shutdown current, 90% peak efficiency at 5V/1A, and compatibility with standard surface-mount inductors and Schottky diodes in space-constrained designs.
Technical Context
The MIC4681-5.0BM TR implements voltage-mode control using a 1.23V bandgap reference and a 200kHz sawtooth oscillator. Its error amplifier compares FB voltage against 1.23V to modulate duty cycle, enabling stable regulation across line (4V–30V), load (0–1A), and temperature (–40°C to +125°C) variations.
Protection features include cycle-by-cycle current limiting (2.2–4.5A short-circuit limit), thermal shutdown at 160°C, and frequency foldback under hard short-circuit conditions-reducing energy per cycle to prevent thermal runaway without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2%, optimized for USB-powered peripherals and GSM charging rails. |
| Switching Frequency | 200kHz ±10%, enabling use of low-cost, shielded 68µH inductors with minimal EMI filtering. |
| Input Voltage Range | 4V to 30V DC, supporting wide-input industrial and automotive battery systems without pre-regulation. |
| Continuous Output Current | 1A at TA = 25°C with adequate PCB ground plane; derates to ~0.7A at TA = 60°C per SOA curves. |
| Shutdown Current | 6µA typical when VSHDN = VIN, enabling ultra-low-power standby in portable devices. |
| Current Limit Threshold | 2.2A minimum short-circuit current limit, sustaining pulsed 2A loads typical in GSM TDMA burst charging. |
| Efficiency | Up to 90% at 5V/1A with 12V input, reducing thermal load in enclosed enclosures. |
Pinout & Package
Package: 8-lead SOP (Small Outline Package), also designated Power-SOP-8 with integrated die-attach paddle connected to pins 5–8 for enhanced thermal performance (θJA = 63°C/W on 6 cm² ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | TTL-compatible enable: logic low (≤0.8V) activates regulator; logic high (≥2V) disables with <6µA quiescent draw. |
| 2 (VIN) | Main power input | Accepts unregulated 4V–30V; requires local 22µF/35V ceramic or tantalum bypass capacitor. |
| 3 (SW) | Switch node output | Drives external inductor and Schottky diode (e.g., B340A); high dv/dt node requiring shortest possible trace routing. |
| 4 (FB) | Feedback input | Not used in MIC4681-5.0BM TR (fixed-output variant); internally tied to 1.23V reference divider for 5.0V regulation. |
| 5–8 (GND) | Power and signal ground | All four pins are electrically common and thermally connected to die paddle-must be soldered to large copper ground plane for thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity for cost-sensitive applications. |
| Internally compensated | Enables stable operation with standard 68µH inductor and 220µF output capacitor-no loop compensation components required. |
| 2.1A minimum current limit | Supports GSM pulse charging profiles (e.g., 2A bursts) without external current-sense circuitry or protection ICs. |
| Power-SOP-8 thermal design | Die-attach paddle bonded to pins 5–8 provides 20°C/W junction-to-case resistance-enabling 1A operation without heatsink on standard FR4. |
| Frequency foldback | Reduces switching frequency to ~60kHz during short-circuit events, limiting power dissipation and preventing thermal damage. |
Applications
| Cellular Phone Battery Charger | GSM TDMA Power Supply |
|---|---|
Use Scenario: Charging Li-ion batteries in dual-mode (GSM/TDMA) handsets using pulsed 2A current profiles. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5.0V rail to charge-management IC and system power domain. Use Value: 2.1A current limit and thermal shutdown ensure safe operation during high-duty-cycle TDMA bursts without external current sensing. | Use Scenario: Generating stable 5V supply for RF power amplifiers and baseband processors in GSM handsets. IC Role / Device Role / Timing Role: High-efficiency step-down converter converting 7.2–12V battery pack voltage to clean 5.0V system rail. Use Value: 90% peak efficiency minimizes heat generation in thermally constrained handset PCBs; 200kHz frequency avoids interference with cellular bands. |
| Industrial 24V-to-5V Converter | POS Terminal Power Module |
Use Scenario: Converting 24V factory bus voltage to 5V for microcontroller, display, and peripheral interfaces. IC Role / Device Role / Timing Role: Fixed-output buck regulator replacing linear regulators or discrete switcher solutions in DIN-rail mounted controllers. Use Value: Wide 4V–30V input range accommodates brownout and surge conditions; Power-SOP-8 enables conduction cooling via chassis-grounded PCB. | Use Scenario: Providing reliable 5V power to barcode scanners, receipt printers, and touchscreens in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Primary DC/DC converter powering multiple 5V peripherals from 12V or 24V wall adapter input. Use Value: <6µA shutdown current supports instant-on wake-from-sleep functionality; SOA curves confirm 1A continuous delivery at 50°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0 | 5V fixed output, 100kHz switching, higher dropout (VIN(min) = VOUT + 2V), no frequency foldback | Lower EMI but less suitable for GSM pulsing; requires larger inductor due to lower frequency | Prefer for noise-sensitive analog systems where 100kHz harmonics fall outside critical bands |
| TPS54202D | 5V fixed output, 500kHz switching, integrated MOSFETs, 2.5V–6V input only | Higher efficiency at light loads but incompatible with >6V inputs; no thermal shutdown hysteresis | Prefer for low-voltage embedded systems (e.g., 5V rail-to-rail conversion) with strict size constraints |
Compared with LM2678-5.0 and TPS54202D, the MIC4681-5.0BM TR uniquely balances wide-input capability (4V–30V), GSM-grade current limiting (2.2A min), and robust thermal protection-making it optimal for industrial and telecom power supplies where input transients and pulsed loads are routine.
Availability
MIC4681-5.0BM TR is available at Aetrix Electronics and suitable for cellular phone battery chargers, industrial 24V-to-5V converters, and POS terminal power modules requiring stable component supply across multi-year production cycles.
Supply support for MIC4681-5.0BM 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 semiconductor company specializing in power management, analog, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC4681-5.0BM TR belongs to Micrel's SuperSwitcher™ family-engineered for high-current, wide-input DC/DC conversion in space- and thermally constrained applications such as portable communications and industrial controls.
FAQ
What is the output voltage tolerance of the MIC4681-5.0BM TR?
The MIC4681-5.0BM TR delivers a fixed 5.0V output with ±2% tolerance over temperature (–40°C to +125°C), line (4V–30V), and load (0–1A) conditions. This is confirmed by electrical characteristics tables showing 4.95V to 5.05V output across full operating range, making it suitable for USB-compliant and microcontroller I/O rail applications.
Does the MIC4681-5.0BM TR require external feedback resistors?
No. The MIC4681-5.0BM TR is the fixed 5.0V output variant-its feedback divider is internal, connecting the FB pin to a precision 1.23V bandgap reference. Unlike the adjustable MIC4681BM, no external R1/R2 network is needed, simplifying layout and improving stability in production environments.
What thermal management is required for full 1A operation of the MIC4681-5.0BM TR?
For continuous 1A output at 25°C ambient, the MIC4681-5.0BM TR requires a minimum 6 cm² copper ground plane connected to pins 5–8. Thermal characterization shows 1A is sustainable at 60°C ambient only with this ground area; exceeding that without enhanced cooling risks thermal shutdown activation above 125°C junction temperature.
Can the MIC4681-5.0BM TR be used in GSM TDMA battery charging applications?
Yes. The MIC4681-5.0BM TR is explicitly characterized for GSM applications: it sustains 4.2V/2A output in typical GSM charging environments and features a 2.2A minimum short-circuit current limit-enabling safe handling of TDMA burst currents without external current-limiting circuitry.
What is the shutdown behavior of the MIC4681-5.0BM TR?
The MIC4681-5.0BM TR draws ≤6µA standby current when SHDN is pulled high to VIN, and ≤35µA when SHDN = 5V. Its shutdown threshold has hysteresis: regulator enables below 0.8V and disables above 2.0V, preventing oscillation near the transition point-verified across –40°C to +125°C in the datasheet's "Shutdown Thresholds vs. Temperature" plot.
MIC4681-5.0BM 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):
- 30V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC4681-5.0BM TR FAQ
1.How can I place an order for MIC4681-5.0BM TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4681-5.0BM 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 MIC4681-5.0BM TR reliable?
The price and inventory of MIC4681-5.0BM TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4681-5.0BM TR is usually 5 days.
3.What payment methods are accepted for MIC4681-5.0BM TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4681-5.0BM TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4681-5.0BM TR?
MIC4681-5.0BM TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4681-5.0BM 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 MIC4681-5.0BM TR?
For technical support, including MIC4681-5.0BM TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4681-5.0BM TR requirements.
6.How does Aetrix verify that MIC4681-5.0BM TR is sourced from the original manufacturer or authorized distributors?
All MIC4681-5.0BM 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 MIC4681-5.0BM TR meets industry standards.
7.What is the process for return or replacement of MIC4681-5.0BM TR?
All MIC4681-5.0BM TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4681-5.0BM 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 MIC4681-5.0BM TR part is unused and in its original packaging.
Return procedure for MIC4681-5.0BM TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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