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Microchip Technology MIC4682YM-TR
- Part No.:
- MIC4682YM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4682YM-TR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,180
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Product details
Overview
MIC4682YM-TR from Micrel is a precision current-limit buck regulator in Power SOIC-8 package, delivering up to 2A continuous output with programmable ±10% current limit accuracy over –40°C to +125°C, fixed 200kHz PWM operation, and 4V–34V input range-ideal for constant-voltage/constant-current battery chargers and USB power supplies.
For engineers reviewing the MIC4682YM-TR datasheet, MIC4682YM-TR pinout, MIC4682YM-TR application, or MIC4682YM-TR equivalent, key selection concerns include current-limit resistor configuration (ISET), thermal management via ground-plane layout, feedback voltage tolerance (1.23V ±1%), shutdown logic thresholds (0.8V/1.25V), and compatibility with standard 68µH inductors and Schottky diodes like B240A.
Technical Context
The MIC4682YM-TR implements voltage-mode PWM control with an internal 200kHz oscillator and 1.23V bandgap reference. Regulation is achieved by comparing FB voltage against the reference, generating PWM via error amplifier and comparator outputs driving a 2A NPN switch.
Current limiting is set externally via ISET pin resistor (e.g., 16.2kΩ for 1A), with cycle-by-cycle protection and thermal shutdown at ~160°C. The device operates without external compensation due to internal loop stabilization optimized for 68µH inductors and 220µF output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 34V DC - supports wide industrial and automotive supply rails including transient-tolerant 24V systems. |
| Output Current | Up to 2A continuous - enabled by thermally enhanced Power SOIC-8 package with θJC = 20°C/W. |
| Current Limit Accuracy | ±10% over –40°C to +125°C - allows precise setting of peak inductor current below saturation, enabling smaller magnetics. |
| Switching Frequency | Fixed 200kHz (180–220kHz) - balances EMI, efficiency, and component size; no external frequency programming required. |
| Feedback Voltage | 1.23V ±1% - sets output voltage via resistive divider; enables stable 1.8V–5V outputs with <1.5% load regulation. |
| Shutdown Current | ≤1µA typical - ensures ultra-low quiescent draw in standby, critical for battery-backed applications. |
| Thermal Shutdown | 160°C junction - protects against sustained overload or poor PCB heatsinking without latch-up. |
Pinout & Package
Package: Power SOIC-8 (M), thermally optimized with exposed die-attach paddle connected to pins 2, 6, and 7 (GND). Requires ≥6 cm² ground plane for full 2A capability at 65°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Senses output voltage via resistive divider; must be routed away from SW node to avoid noise coupling. |
| 2, 6, 7 (GND) | Ground Return / Thermal Path | Common ground and primary thermal conduction path to PCB; must connect to large copper area. |
| 3 (ISET) | Current Limit Set Input | Resistor-to-ground sets peak current (400mA–2A); floating or shorting causes malfunction or overcurrent. |
| 4 (SHDN) | Shutdown Control Input | Logic low (<0.8V) enables regulator; high (>2V) disables with <1µA quiescent current. |
| 5 (IN) | Main Supply Input | Accepts 4V–34V unregulated input; requires low-ESR input capacitor (e.g., dual 10µF tantalum + 0.1µF ceramic). |
| 8 (SW) | Internal Switch Output | Drives external inductor/diode; exhibits 1.4–1.8V saturation drop at 1A; sensitive to layout parasitics. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable current limit | Set via single external resistor (e.g., 16.2kΩ → 1A) with ±10% accuracy across full temperature range. |
| Internally compensated control loop | Stable with standard 68µH inductors and 220µF output caps-no external compensation components needed. |
| Robust thermal design | Power SOIC-8 package delivers 2A continuous with θJA = 63°C/W on 6 cm² ground plane. |
| Cycle-by-cycle current limiting | Prevents inductor saturation and MOSFET overstress during startup, short-circuit, or transient overload. |
| Low shutdown current | <1µA typical - extends battery life in portable chargers and always-on USB power delivery systems. |
Applications
| Battery Charging | USB Power Delivery |
|---|---|
Use Scenario: Single-cell Li-ion charger with CC/CV profile and 4.2V ±0.75% termination voltage. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated output and precise current limiting via ISET resistor. Use Value: Enables compact, low-BOM-cost charger using standard 68µH inductor and B240A diode, with <1% output voltage drift over temperature. | Use Scenario: 5V/1A USB port power supply compliant with USB 2.0 voltage tolerance (4.75–5.25V). IC Role / Device Role / Timing Role: Step-down regulator converting 7.5–34V input to stable 5V output with programmable current limit for overcurrent protection. Use Value: Delivers full 1A at >80% efficiency across 12V–24V inputs, with shutdown control for port enable/disable functionality. |
| White LED Driver | Industrial 24V Step-Down |
Use Scenario: Constant-current driver for 3–6串联 white LEDs requiring 350mA–700mA at 9–18V. IC Role / Device Role / Timing Role: Buck converter operating in constant-current mode via ISET pin, with FB used for overvoltage clamp. Use Value: Eliminates need for separate current-sense IC; ±10% current accuracy ensures consistent LED brightness across temperature. | Use Scenario: Point-of-load regulator powering FPGA I/O banks or sensors from 24V rail in industrial PLC modules. IC Role / Device Role / Timing Role: Robust 2A buck converter handling 24V transients up to 34V, with thermal shutdown protecting against enclosure overheating. Use Value: Supports continuous 2A output at 125°C junction temperature when mounted on ≥6 cm² ground plane, reducing need for forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | Fixed 150kHz switching frequency; ±2% feedback reference; no programmable current limit - relies on external sensing. | Lacks precision current limiting; requires additional op-amp/current-sense resistor for CC operation. | Choose LM2596S-ADJ only if cost is primary concern and ±2% VOUT tolerance suffices; not suitable for battery charging where current accuracy is critical. |
| TPS54202DRT | 4.5–28V input; 2A output; adjustable 200–1800kHz frequency; integrated FETs; ±1% reference; no dedicated ISET pin. | Uses internal current sense and average-current-mode control; less intuitive for precise CC setup than MIC4682YM-TR's resistor-based ISET. | Select TPS54202DRT for higher-frequency designs needing smaller inductors, but expect added complexity in achieving ±10% current limit accuracy without calibration. |
Compared with LM2596S-ADJ and TPS54202DRT, the MIC4682YM-TR uniquely combines resistor-programmable ±10% current limiting, 4–34V input flexibility, and Power SOIC-8 thermal performance - making it the optimal choice for cost-sensitive, thermally constrained CC/CV applications where simplicity and accuracy are prioritized over frequency agility.
Availability
MIC4682YM-TR is available at Aetrix Electronics and suitable for battery chargers, USB power supplies, white LED drivers, and industrial 24V step-down converters requiring stable component supply with guaranteed long-term availability.
Supply support for MIC4682YM-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 founded in 1978 and acquired by Microchip Technology in 2015. It specialized in power management, timing, and interface solutions.
The MIC4682YM-TR belongs to Micrel's SuperSwitcher™ family of integrated buck regulators, designed specifically for space-constrained, thermally demanding constant-voltage/constant-current applications such as portable battery charging and industrial DC-DC conversion.
FAQ
What is the recommended ISET resistor value for a 1A current limit on the MIC4682YM-TR?
The MIC4682YM-TR datasheet specifies a 16.2kΩ resistor from ISET pin to ground for a nominal 1A current limit. This value achieves ±10% accuracy over –40°C to +125°C. A 10MΩ resistor from ISET to IN is also recommended to improve accuracy across input voltage variations. Do not short or float the ISET pin, as either action causes unstable operation or excessive current.
Can the MIC4682YM-TR operate with an input voltage lower than 4V?
No - the MIC4682YM-TR has a minimum operating input voltage of 4V per its Absolute Maximum Ratings and Electrical Characteristics tables. Below 4V, the internal regulator cannot sustain bias, causing erratic switching or complete dropout. For sub-4V applications, consider alternative regulators such as the MIC2280 or TPS62130.
How does the MIC4682YM-TR handle thermal overload conditions?
The MIC4682YM-TR incorporates thermal shutdown circuitry that disables the internal switch when junction temperature exceeds approximately 160°C. Once cooled below the hysteresis threshold (~145°C), normal operation resumes automatically. This protection is independent of current limit and shutdown pin state, ensuring robustness even under sustained overload or inadequate PCB heatsinking.
Is the MIC4682YM-TR pin-compatible with other members of the MIC4682 family?
Yes - the MIC4682YM-TR shares identical Power SOIC-8 pinout and electrical behavior with MIC4682BM and MIC4682YM variants. All share the same FB, GND, ISET, SHDN, IN, and SW pin assignments and functions. Differences are limited to ordering-specific markings and packaging (tape-and-reel vs. tube), not functional or mechanical compatibility.
What output capacitor types are recommended for stable operation of the MIC4682YM-TR?
The MIC4682YM-TR is optimized for use with 220µF tantalum output capacitors (e.g., Vishay Sprague 593D227X0010D2T) plus a parallel 0.1µF ceramic capacitor placed near the FB and GND pins. Low-ESR electrolytics may be substituted in cost-sensitive designs but increase output ripple and reduce phase margin. Ceramic-only solutions are not recommended due to insufficient capacitance and potential resonance issues.
MIC4682YM-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):
- 34V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 32.3V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC4682YM-TR FAQ
1.How can I place an order for MIC4682YM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4682YM-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 MIC4682YM-TR reliable?
The price and inventory of MIC4682YM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4682YM-TR is usually 5 days.
3.What payment methods are accepted for MIC4682YM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4682YM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4682YM-TR?
MIC4682YM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4682YM-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 MIC4682YM-TR?
For technical support, including MIC4682YM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4682YM-TR requirements.
6.How does Aetrix verify that MIC4682YM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4682YM-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 MIC4682YM-TR meets industry standards.
7.What is the process for return or replacement of MIC4682YM-TR?
All MIC4682YM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4682YM-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 MIC4682YM-TR part is unused and in its original packaging.
Return procedure for MIC4682YM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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