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Microchip Technology MIC4682YM
- Part No.:
- MIC4682YM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4682YM.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:216
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Product details
Overview
MIC4682YM 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. It operates at fixed 200kHz PWM, supports 4V–34V input, and integrates internal compensation for constant-voltage/constant-current battery charging applications.
For engineers reviewing the MIC4682YM datasheet, MIC4682YM pinout, MIC4682YM application, or MIC4682YM equivalent, key selection criteria include its programmable current limit via ISET resistor, thermal shutdown at 160°C, 1.23V feedback reference, switch saturation voltage of 1.4V (typ) at 1A, and compatibility with standard surface-mount inductors and Schottky diodes in compact DC/DC designs.
Technical Context
The MIC4682YM 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 using an error amplifier whose output modulates pulse width against a sawtooth waveform.
Current limiting is cycle-by-cycle and set externally via resistor on ISET pin, enabling precise peak current control from 400mA to 2A. Protection includes over-temperature shutdown (160°C trip), and the power SOIC-8 package uses pins 2/6/7 plus die-attach paddle as unified thermal ground path with θJC = 20°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 34V - supports wide industrial and automotive supply rails including transient-tolerant 24V systems. |
| Output Current | Up to 2A continuous - enabled by thermally optimized Power SOIC-8 package with dedicated ground pins and low θJC. |
| Current Limit Accuracy | ±10% over –40°C to +125°C - enables reliable constant-current operation without recalibration across temperature. |
| Feedback Reference | 1.23V ±1% - sets output voltage via external resistor divider; enables stable CV regulation for Li-ion charging. |
| Switching Frequency | 200kHz (180–220kHz range) - balances EMI, efficiency, and external component size for cost-sensitive buck designs. |
| Shutdown Current | <1µA typical - minimizes system standby power loss in battery-powered or always-on applications. |
| Thermal Shutdown | 160°C junction - protects device during overload or poor PCB thermal design while allowing full 125°C continuous operation. |
Pinout & Package
Package: Power SOIC-8 (M), thermally enhanced with exposed die-attach paddle connected internally to GND; pins 2, 6, and 7 are ground terminals tied to the paddle for low-impedance thermal and electrical return.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Senses output voltage via resistor divider; must be routed away from switching nodes to avoid noise-induced regulation errors. |
| 2, 6, 7 (GND) | Ground Return | Unified thermal/electrical ground path; requires direct connection to large PCB copper area for thermal management. |
| 3 (ISET) | Current Limit Set | Accepts external resistor to ground; sets peak switch current from 400mA to 2A; floating or shorting invalidates current limit. |
| 4 (SHDN) | Shutdown Control | Active-low logic input; <0.8V enables regulator, >2V disables it with <1µA quiescent draw. |
| 5 (IN) | Power Input | Unregulated 4–34V supply input; requires local low-ESR ceramic + bulk capacitor for ripple suppression. |
| 8 (SW) | Switch Output | Drives external inductor; connects to cathode of Schottky diode; high dv/dt node requiring tight layout and ground shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable current limit | Set via single external resistor (400mA–2A range) with ±10% accuracy across full temperature range - eliminates need for current-sense amplifiers in CVCC chargers. |
| Internally compensated | Stable with 68µH inductor and 220µF output capacitor - reduces BOM count and design iteration time versus externally compensated regulators. |
| Power SOIC-8 thermal design | θJC = 20°C/W with pins 2/6/7 and paddle as common thermal path - enables 2A continuous output without heatsink on 6 cm² ground plane. |
| Cycle-by-cycle current limiting | Prevents switch overcurrent during startup, short-circuit, or transient load events - maintains reliability without external fault latching circuitry. |
| Wide input voltage range | 4V–34V operation with 38V absolute max - accommodates 12V/24V industrial rails and handles load-dump transients without external protection. |
Applications
| Battery Charging | White LED Driver |
|---|---|
Use Scenario: Single-cell Li-ion charger with constant-current (1A) and constant-voltage (4.2V) stages. IC Role / Device Role / Timing Role: Primary buck controller regulating both output voltage and peak inductor current via FB and ISET pins. Use Value: ±10% current limit accuracy ensures consistent charge termination across temperature, extending battery cycle life without external sensing. | Use Scenario: High-efficiency backlight driver for LCD panels using series-connected white LEDs. IC Role / Device Role / Timing Role: Constant-current buck regulator where ISET sets LED string current; FB monitors sense resistor voltage. Use Value: Fixed 200kHz switching avoids audible noise while enabling small 68µH inductor and low-profile layout. |
| USB Power Supply | Industrial 5V Step-Down |
Use Scenario: Compact 5V/1A USB port supply from 9–24V input in portable docking stations. IC Role / Device Role / Timing Role: Primary voltage regulator with SHDN controlled by host microcontroller for power sequencing. Use Value: <1µA shutdown current meets USB suspend power budgets; 4V min input supports VBUS brownout tolerance. | Use Scenario: 5V rail generation for PLC I/O modules operating from 12–30V field power. IC Role / Device Role / Timing Role: Robust primary DC/DC converter handling voltage transients and ambient temperatures up to +85°C. Use Value: 34V max input and thermal shutdown protect against 24V field wiring faults; Power SOIC-8 withstands industrial reflow profiles. |
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; 63µH recommended inductor; higher quiescent current (50mA). | Best for fixed-output, non-current-limited 5V supplies; lacks CVCC capability for battery charging. | Select when output voltage is fixed and current limiting is handled externally or not required. |
| TPS54202DDCR | Adjustable output; integrated MOSFETs; 4.5–28V input; 2A output; requires external compensation; no dedicated ISET pin. | Higher integration but no precision current limit function; needs external current-sense circuit for CC operation. | Choose for higher efficiency at light loads or when board space allows additional sensing components. |
Compared with LM2678-5.0/NOPB and TPS54202DDCR, the MIC4682YM uniquely combines programmable ±10% current limiting, internal compensation, and wide-input ruggedness in a single Power SOIC-8 package-making it optimal for cost-sensitive, thermally constrained CVCC applications where external sensing adds complexity or cost.
Availability
MIC4682YM is available at Aetrix Electronics and suitable for battery charging, LED driver, and industrial 5V step-down applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for MIC4682YM 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 IC manufacturer specializing in high-reliability DC/DC converters, timing devices, and interface solutions before its acquisition by Microchip Technology in 2015.
The MIC4682YM belongs to Micrel's SuperSwitcher™ family of buck regulators, designed specifically for cost-effective, thermally robust constant-voltage/constant-current power conversion in space-constrained industrial and portable equipment.
FAQ
What is the maximum continuous output current supported by the MIC4682YM?
The MIC4682YM delivers up to 2A continuous output current when used with proper PCB thermal design-specifically, a minimum 6 cm² ground plane connected to pins 2, 6, and 7. This rating assumes ambient temperature ≤60°C and VIN = 12V. At higher input voltages or ambient temperatures, derating per the SOA curves in the MIC4682YM datasheet is required to maintain junction temperature below 125°C.
How do I set the current limit for the MIC4682YM?
To set the current limit for the MIC4682YM, connect a resistor (RISET) between pin 3 (ISET) and ground. The value is calculated using the formula ILIM ≈ 1.23V / RISET, yielding 1A with 1.23kΩ or 1.62kΩ depending on accuracy target. For example, a 16.2kΩ resistor sets ~75.3mA, while 1.23kΩ sets ~1A. Do not short or float the ISET pin, and add a 10MΩ resistor from ISET to IN for improved voltage-range accuracy.
Does the MIC4682YM require external compensation components?
No, the MIC4682YM does not require external compensation components. It features fully internal compensation optimized for stability with standard 68µH inductors and 220µF output capacitors, as verified in the MIC4682YM datasheet's Bode plots. This eliminates loop compensation design effort and reduces bill-of-materials cost compared to externally compensated buck controllers.
What protection features are integrated into the MIC4682YM?
The MIC4682YM integrates cycle-by-cycle current limiting, thermal shutdown at approximately 160°C junction temperature, and input overvoltage tolerance up to 38V (transient only). It also features a logic-controlled shutdown input (pin 4) that reduces quiescent current to less than 1µA. These protections operate autonomously without external circuitry, enhancing system reliability in unattended or harsh-environment applications.
Can the MIC4682YM be used in a constant-voltage/constant-current lithium-ion battery charger?
Yes, the MIC4682YM is explicitly designed for constant-voltage/constant-current (CVCC) lithium-ion battery charging. Its precision ±10% current limit over temperature and accurate 1.23V feedback reference enable reliable 4.2V CV regulation and programmable CC stage (e.g., 1A) using only two external resistors. Typical application circuits in the MIC4682YM datasheet demonstrate full Li-ion charging functionality with <0.75% output voltage error.
MIC4682YM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SuperSwitcher™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MIC4682YM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4682YM 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 reliable?
The price and inventory of MIC4682YM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4682YM is usually 5 days.
3.What payment methods are accepted for MIC4682YM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4682YM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4682YM?
MIC4682YM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4682YM 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?
For technical support, including MIC4682YM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4682YM requirements.
6.How does Aetrix verify that MIC4682YM is sourced from the original manufacturer or authorized distributors?
All MIC4682YM 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 meets industry standards.
7.What is the process for return or replacement of MIC4682YM?
All MIC4682YM units undergo pre-shipment inspection (PSI). If there is an issue with MIC4682YM, 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 part is unused and in its original packaging.
Return procedure for MIC4682YM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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