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Microchip Technology MIC4681YM-TR
- Part No.:
- MIC4681YM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4681YM-TR.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,246
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Product details
Overview
MIC4681YM-TR from Micrel is a voltage-mode synchronous buck regulator IC with integrated 2.1A NPN switch, operating at fixed 200kHz switching frequency, supporting 4V–30V input and adjustable output down to 1.25V, delivering up to 1A continuous output current in SOP-8 package for GSM battery charger applications.
For engineers reviewing the MIC4681YM-TR datasheet, MIC4681YM-TR pinout, MIC4681YM-TR application, or MIC4681YM-TR equivalent, key selection criteria include its 1.23V feedback reference tolerance (±1%), thermal shutdown at 160°C, 2.2–4.5A short-circuit current limit, <6µA shutdown quiescent current, and compatibility with standard surface-mount inductors and capacitors in high-efficiency DC/DC conversion designs.
Technical Context
The MIC4681YM-TR implements voltage-mode control architecture using a 1.23V internal bandgap reference and fixed-frequency 200kHz oscillator; duty cycle is adjusted via error amplifier comparison between FB voltage and reference, enabling stable regulation across line/load transients.
It integrates cycle-by-cycle current limiting and thermal shutdown protection; shutdown logic accepts TTL-compatible inputs (ON <0.8V, OFF >2V), and the power-SOP-8 package features pins 5–8 tied to a common die-attach paddle for low θJC (20°C/W) thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V - supports wide industrial and automotive supply rails without pre-regulation. |
| Switching Frequency | 200kHz ±20kHz - enables use of compact, low-cost 68µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Feedback Reference | 1.23V ±1% - sets output voltage via external resistor divider; enables precise 3.3V, 5V, or custom outputs with minimal drift over temperature. |
| Continuous Output Current | 1A - sustained delivery under full load at TJ ≤ 125°C with proper PCB ground plane area ≥6 cm². |
| Short-Circuit Current Limit | 2.2A to 4.5A - protects against hard shorts while allowing pulsed 2A GSM charging bursts. |
| Shutdown Quiescent Current | 6µA at VSHDN = VIN - minimizes battery drain in standby mode for portable systems. |
| Thermal Shutdown Threshold | 160°C - provides fail-safe junction protection; device resumes operation after cooldown. |
Pinout & Package
Package: 8-lead SOP (M), power-enhanced variant with exposed die-attach paddle connected to pins 5–8 (GND); rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | TTL-compatible enable: <0.8V = ON, >2V = OFF; draws <1µA leakage in both states. |
| 2 VIN | Main power input | Accepts unregulated 4–30V; requires local 22µF/35V ceramic or tantalum bypass capacitor. |
| 3 SW | Switch node output | Drives external inductor/diode; connects to emitter of internal NPN switch; high di/dt node requiring short trace routing. |
| 4 FB | Feedback input | Senses divided output voltage; must be routed away from SW, L1, and D1 to avoid noise coupling. |
| 5–8 GND | Power and signal ground | All four pins internally bonded to common paddle; must connect to large PCB ground plane (≥6 cm²) for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation components; ensures ≥53° phase margin with 68µH/220µF output filter. |
| Fixed 200kHz oscillator | Enables predictable EMI profile and simplifies filter design versus variable-frequency controllers. |
| High-current switch with 2.1A min limit | Supports 2A pulsed GSM battery charging without external FET, reducing BOM count. |
| Low shutdown current | 6µA at VSHDN = VIN - extends battery life in always-on portable devices during idle periods. |
| Thermal and overcurrent protection | Auto-recovering shutdown prevents latch-up during overload; no external sensing required. |
Applications
| Cellular Phone Battery Charger | GSM Pulse Charging System |
|---|---|
Use Scenario: Charging Li-ion batteries in dual-mode (GSM/TDMA) handsets from 5–30V wall adapters or car chargers. IC Role / Device Role / Timing Role: Primary buck regulator controlling constant-current/constant-voltage charge profile via FB voltage programming. Use Value: Delivers 4.2V/2A pulsed output within GSM timing constraints while maintaining <1.25% output voltage accuracy. | Use Scenario: High-efficiency step-down conversion in baseband power supplies requiring burst-mode current delivery. IC Role / Device Role / Timing Role: Voltage-mode buck controller synchronizing with RF transmit pulses to minimize interference. Use Value: 200kHz fixed frequency avoids critical GSM bands; fast transient response (<100µs) maintains regulation during 577µs TDMA slots. |
| Industrial 1A Buck Converter | Inverting Buck-Boost Supply |
Use Scenario: Replacing TO-220 linear regulators in programmable logic controllers and sensor interfaces. IC Role / Device Role / Timing Role: Compact, surface-mount DC/DC converter providing stable 3.3V or 5V from 12–24V rail. Use Value: Achieves up to 90% efficiency at 1A, reducing heat sink requirements and board space vs. discrete solutions. | Use Scenario: Generating negative bias voltages (e.g., –12V) from positive 12V input in analog front-ends. IC Role / Device Role / Timing Role: Configured as positive-to-negative converter using external diode and inductor. Use Value: Supports –12V/150mA output with <150mV ripple; leverages same 200kHz timing and compensation for predictable stability. |
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/NOPB | Fixed 5V output; 63V max input; 5A peak current; requires external compensation. | Not adjustable; suited for fixed-rail systems only; higher input voltage range but larger solution size. | Select when 5V output suffices and higher input voltage tolerance is needed; verify layout for thermal management. |
| TPS54202DRCT | 4.5–28V input; 2A continuous; 500kHz switching; integrated MOSFETs; requires external compensation. | Higher frequency allows smaller magnetics; lacks built-in thermal foldback; different pinout and control scheme. | Choose for higher density designs needing >1A continuous output; re-evaluate loop stability and EMI filtering. |
Compared with LM2678-5.0/NOPB and TPS54202DRCT, the MIC4681YM-TR offers adjustable output, lower shutdown current (6µA vs. >10µA), and integrated thermal foldback-making it optimal for battery-powered GSM chargers where efficiency, pulse capability, and compactness are prioritized over fixed output or ultra-high current.
Availability
MIC4681YM-TR is available at Aetrix Electronics and suitable for cellular phone battery chargers, industrial 1A buck converters, and GSM pulse charging systems requiring stable component supply across extended product lifecycles.
Supply support for MIC4681YM-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 RF solutions before its acquisition by Microchip Technology in 2015.
The MIC4681YM-TR belongs to Micrel's SuperSwitcher™ family of integrated buck regulators, designed specifically for high-efficiency, low-component-count DC/DC conversion in portable and telecom power applications.
FAQ
What is the maximum continuous output current supported by the MIC4681YM-TR?
The MIC4681YM-TR delivers up to 1A continuous output current when mounted on a PCB with ≥6 cm² ground plane area and ambient temperature ≤60°C. At higher temperatures or reduced copper area, derating applies per the SOA curves in the datasheet; peak pulsed current reaches 2A for GSM charging cycles.
Does the MIC4681YM-TR require external compensation components?
No, the MIC4681YM-TR features internal frequency compensation optimized for stability with standard 68µH inductors and 220µF output capacitors. This eliminates external compensation networks and simplifies design, achieving ≥53° phase margin across input/output/load conditions.
What is the feedback reference voltage accuracy of the MIC4681YM-TR?
The MIC4681YM-TR has a 1.23V feedback reference with ±1% initial tolerance (1.217V–1.243V) and ±0.04V drift over –40°C to +125°C junction temperature, ensuring precise output voltage regulation for 3.3V, 5V, or custom configurations using two-resistor dividers.
How does the MIC4681YM-TR handle short-circuit conditions?
Under short-circuit, the MIC4681YM-TR activates frequency foldback-reducing switching frequency from 200kHz to ~60kHz-to limit energy per cycle and prevent thermal runaway. It also employs cycle-by-cycle current limiting with a 2.2–4.5A threshold and thermal shutdown at 160°C for robust fault protection.
Can the MIC4681YM-TR be used in inverting buck-boost topology?
Yes, the MIC4681YM-TR can be configured as a positive-to-negative converter (inverting buck-boost) using external inductor, diode, and capacitor. The datasheet provides a validated +12V to –12V/150mA circuit (Figure 8), confirming stable operation with appropriate component selection and layout.
MIC4681YM-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:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 28.5V
- 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
MIC4681YM-TR FAQ
1.How can I place an order for MIC4681YM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4681YM-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 MIC4681YM-TR reliable?
The price and inventory of MIC4681YM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4681YM-TR is usually 5 days.
3.What payment methods are accepted for MIC4681YM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4681YM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4681YM-TR?
MIC4681YM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4681YM-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 MIC4681YM-TR?
For technical support, including MIC4681YM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4681YM-TR requirements.
6.How does Aetrix verify that MIC4681YM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4681YM-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 MIC4681YM-TR meets industry standards.
7.What is the process for return or replacement of MIC4681YM-TR?
All MIC4681YM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4681YM-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 MIC4681YM-TR part is unused and in its original packaging.
Return procedure for MIC4681YM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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