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Microchip Technology MIC4682BM-TR
- Part No.:
- MIC4682BM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4682BM-TR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,116
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Product details
Overview
MIC4682BM-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-designed for constant-voltage/constant-current battery chargers and USB power supplies.
For engineers reviewing the MIC4682BM-TR datasheet, MIC4682BM-TR pinout, MIC4682BM-TR application, or MIC4682BM-TR equivalent, key selection considerations include its thermally optimized Power SOIC-8 package, internal compensation, <1µA shutdown current, cycle-by-cycle current limiting, and thermal shutdown at 160°C-critical for space-constrained industrial and portable power designs.
Technical Context
The MIC4682BM-TR implements voltage-mode PWM control with a 200kHz oscillator and internal 1.23V bandgap reference. Regulation is achieved by comparing FB voltage against this reference, generating PWM via error amplifier and comparator outputs driving an integrated NPN switch.
Current limiting is set externally via ISET pin resistor (400mA–2A range), with ±10% accuracy across temperature; protection includes cycle-by-cycle current limiting, thermal shutdown at 160°C, and 38V absolute max input rating-enabling robust operation in automotive transients and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 34V DC - supports wide-input applications including 12V/24V industrial rails and automotive battery systems with transient tolerance. |
| Output Current | Up to 2A continuous - enabled by thermally enhanced Power SOIC-8 package with θJC = 20°C/W and dedicated ground pins (2,6,7). |
| Current Limit Accuracy | ±10% over –40°C to +125°C - enables precise constant-current battery charging without external sensing or calibration. |
| Switching Frequency | Fixed 200kHz (180–220kHz) - balances EMI, efficiency, and external component size; eliminates need for external frequency programming. |
| Feedback Reference | 1.23V ±1% - sets output voltage via resistive divider; enables stable 1.8V–5V outputs with minimal load regulation error. |
| Shutdown Current | <1µA typical - ensures ultra-low standby power in battery-powered systems during sleep or fault conditions. |
| Thermal Shutdown | 160°C junction - provides fail-safe protection without external thermal monitoring circuitry. |
Pinout & Package
Package: Power SOIC-8 (M), thermally enhanced with exposed die-attach paddle connected to pins 2, 6, and 7 (GND). Designed for high-power dissipation in compact layouts with ≥6 cm² ground plane area recommended.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Senses output voltage via resistive divider; must be routed away from switching nodes to avoid noise coupling and regulation instability. |
| 2, 6, 7 (GND) | Ground Return / Thermal Path | Shared low-impedance ground and primary thermal conduction path to PCB; all three pins must connect to large copper pour for 2A operation. |
| 3 (ISET) | Current Limit Set Input | Resistor-to-ground sets peak current limit (400mA–2A); floating or shorting causes malfunction-must be actively biased. |
| 4 (SHDN) | Shutdown Control Input | Logic-low (<0.8V) enables regulator; logic-high (>2V) disables with <1µA quiescent draw-supports system-level power sequencing. |
| 5 (IN) | Unregulated Input Supply | Accepts 4V–34V; requires low-ESR input capacitors (e.g., dual 10µF tantalum + 0.1µF ceramic) placed adjacent to pins 5 and 6. |
| 8 (SW) | Internal Switch Output | Drives external inductor; connects to Schottky diode cathode; high dV/dt node requiring minimized trace length and loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable current limit | Set via single external resistor (RISET) with ±10% accuracy across full –40°C to +125°C junction range-eliminates need for current-sense amplifiers in CVCC chargers. |
| Internally compensated | Stable with standard 68µH inductor and 220µF output capacitor-reduces BOM count and design validation time versus externally compensated regulators. |
| Power SOIC-8 thermal performance | θJA = 63°C/W on 1.5″ FR4 board; enables 2A continuous output without heatsink-ideal for space-constrained industrial and portable applications. |
| Cycle-by-cycle current limiting | Prevents inductor saturation and MOSFET overstress during startup, short-circuit, or overload-enhances reliability in unattended systems. |
| Ultra-low shutdown current | <1µA typical-extends battery life in always-on or intermittently powered devices such as USB-C PD accessories and smart sensors. |
Applications
| Battery Charging | USB Power Delivery |
|---|---|
Use Scenario: Single-cell Li-ion battery charger with constant-current (1A) and constant-voltage (4.2V) stages. IC Role / Device Role / Timing Role: Primary buck controller providing regulated output and precise current limiting via ISET resistor; no external current-sense IC required. Use Value: Achieves ±0.75% output voltage accuracy and ±10% current limit accuracy across temperature-meets JEITA-compliant charging profiles without trimming. |
Use Scenario: 5V/1A USB port supply in industrial docking station with input from 12V rail. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator delivering stable 5V output with fast transient response due to internal compensation and 200kHz switching. Use Value: Enables all-surface-mount solution with minimal external components-reduces footprint vs. discrete DC-DC + LDO architectures. |
| White LED Driver | Industrial Step-Down Converter |
Use Scenario: Constant-current driver for 3-series white LEDs (9.6V @ 350mA) from 12V supply. IC Role / Device Role / Timing Role: Buck converter operating in CC mode via ISET configuration; FB used for overvoltage protection only. Use Value: Eliminates need for separate current-sense resistor and op-amp, reducing power loss and component count while maintaining ±10% LED current accuracy. |
Use Scenario: 3.3V/1.5A supply for microcontroller and peripherals in factory automation sensor node. IC Role / Device Role / Timing Role: Main power regulator with wide 4V–34V input range tolerating 24V rail transients and brownouts. Use Value: Robust operation under harsh electrical conditions-cycle-by-cycle limiting and thermal shutdown prevent field failures in unventilated enclosures. |
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; no programmable current limit; requires external compensation; 63V max input. | Lacks precision current limiting-unsuitable for battery charging or LED drivers requiring tight CC control. | Select when fixed 5V output and higher input voltage margin are prioritized over current-programmability. |
| TPS54202DDCR | Adjustable output; 4.5–28V input; 2A; integrated FETs; 500kHz switching; requires external current-sense resistor for CC mode. | Higher frequency enables smaller magnetics but adds complexity and cost for current sensing-less optimal for simple CVCC designs. | Choose for higher efficiency at light loads or when faster transient response justifies added design effort. |
Compared with LM2678-5.0/NOPB and TPS54202DDCR, the MIC4682BM-TR uniquely integrates precision programmable current limiting without external sense components-making it the most direct solution for cost-sensitive, space-constrained constant-current applications like Li-ion charging and LED biasing.
Availability
MIC4682BM-TR is available at Aetrix Electronics and suitable for battery chargers, USB power supplies, and industrial step-down converters requiring stable component supply, long-term lifecycle support, and guaranteed thermal performance in Power SOIC-8 packaging.
Supply support for MIC4682BM-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 power management semiconductor company headquartered in San Jose, CA, acquired by Microchip Technology in 2015. Known for high-reliability DC-DC solutions and timing products.
The MIC4682BM-TR belongs to Micrel's SuperSwitcher™ family of integrated buck regulators-engineered specifically for constant-voltage/constant-current applications where precision current limiting, thermal robustness, and minimal external components are critical design requirements.
FAQ
What is the maximum continuous output current of the MIC4682BM-TR?
The MIC4682BM-TR delivers up to 2A continuous output current when mounted on a PCB with adequate thermal design-specifically, a minimum 6 cm² ground plane connected to pins 2, 6, and 7. This rating assumes ambient temperature ≤60°C and proper layout per Micrel's thermal guidelines; derating applies above that temperature.
How is the current limit programmed on the MIC4682BM-TR?
The current limit of the MIC4682BM-TR is set using an external resistor (RISET) connected between pin 3 (ISET) and ground. For example, a 16.2kΩ resistor yields a 1A limit. The device achieves ±10% accuracy over –40°C to +125°C junction temperature-no calibration or trimming is required. Do not float or short the ISET pin.
Does the MIC4682BM-TR require external compensation components?
No, the MIC4682BM-TR features internal compensation optimized for stability with standard 68µH inductors and 220µF output capacitors. This eliminates external compensation networks, reduces BOM count, and simplifies layout-verified by Micrel's published Bode plots showing >35° phase margin under typical conditions.
What protection features does the MIC4682BM-TR include?
The MIC4682BM-TR includes cycle-by-cycle current limiting, thermal shutdown at ~160°C, and input overvoltage tolerance up to 38V. These protections operate autonomously without external circuitry-ensuring safe recovery after faults and eliminating need for discrete protection ICs in most industrial and automotive auxiliary power designs.
Can the MIC4682BM-TR be used for adjustable output voltages?
Yes, the MIC4682BM-TR supports adjustable output voltages via the FB pin using a resistive divider. With a 1.23V internal reference, outputs from 1.8V to 5V (and higher with scaling) are achievable-for example, 3.3V using R1 = 3.01kΩ and R2 = 976Ω. Output voltage accuracy is ±1% at room temperature and ±2% over full temperature range.
MIC4682BM-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:
- Discontinued at Digi-Key
- 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
MIC4682BM-TR FAQ
1.How can I place an order for MIC4682BM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4682BM-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 MIC4682BM-TR reliable?
The price and inventory of MIC4682BM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4682BM-TR is usually 5 days.
3.What payment methods are accepted for MIC4682BM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4682BM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4682BM-TR?
MIC4682BM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4682BM-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 MIC4682BM-TR?
For technical support, including MIC4682BM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4682BM-TR requirements.
6.How does Aetrix verify that MIC4682BM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4682BM-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 MIC4682BM-TR meets industry standards.
7.What is the process for return or replacement of MIC4682BM-TR?
All MIC4682BM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4682BM-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 MIC4682BM-TR part is unused and in its original packaging.
Return procedure for MIC4682BM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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