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Microchip Technology MIC3201YME
- Part No.:
- MIC3201YME
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MIC3201YME.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,750
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Product details
Overview
MIC3201YME from Micrel Inc. is a hysteretic step-down, constant-current LED driver IC designed for high-brightness LED lighting systems. It integrates a 1A internal power MOSFET, supports 6V–20V input, delivers ±5% LED current accuracy via high-side sensing, and operates up to 1MHz switching frequency-enabling compact, efficient 12V MR-16 bulb and architectural lighting designs.
For engineers reviewing the MIC3201YME datasheet, MIC3201YME pinout, MIC3201YME application, or MIC3201YME equivalent, key selection criteria include its high-side current sense architecture, dedicated PWM dimming (DIM) input, thermal shutdown at 165°C, 8-pin ePAD SOIC package with exposed thermal pad, and compatibility with 0.2Ω external sense resistors for 1A LED loads.
Technical Context
The MIC3201YME implements a hysteretic (bang-bang) control topology without error amplifier or loop compensation-relying on VCS(MAX) = 224mV and VCS(MIN) = 171mV thresholds to toggle the internal 1A MOSFET. Its high-side current sense eliminates ground path disruption and enables accurate series-LED current regulation independent of output voltage swing.
Operation requires an external Schottky freewheeling diode and inductor; switching frequency varies dynamically with input voltage, LED string voltage, and load current-peaking at 1MHz under nominal conditions. The integrated 5V regulator powers internal circuitry only and mandates a 1µF ceramic bypass capacitor between VCC and AGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.0V to 20V - supports direct 12V/24V rail operation without pre-regulation |
| LED Output Current Accuracy | ±5% - achieved via high-side current sense amplifier and 35mV hysteresis window |
| Internal Power Switch | 1A MOSFET with RDS(ON) = 550mΩ max - limits conduction loss at full load |
| Switching Frequency | Up to 1MHz - enables use of small 22µH inductors and reduces solution footprint |
| Junction Temperature Range | −40°C to +125°C - validated for industrial and outdoor lighting environments |
| Thermal Shutdown Threshold | 165°C with 20°C hysteresis - protects against sustained overtemperature in enclosed fixtures |
| PWM Dimming Frequency Support | Up to 20kHz - avoids audible noise while enabling smooth 1%–99% duty-cycle brightness control |
Pinout & Package
Package: 8-pin ePAD SOIC (ME) with exposed thermal pad (EP) connected to PGND-provides θJA = 41°C/W for thermal management in high-power LED drivers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Voltage regulator output | 5V internal supply for analog circuitry; requires 1µF ceramic bypass to AGND-no external loading permitted |
| 2 - CS | High-side current sense input | Monitors voltage drop across external RCS resistor; Kelvin connection required for ±5% accuracy |
| 3 - VIN | Main power input | 6V–20V supply for both control circuitry and power switch; requires 10µF ceramic bypass to PGND |
| 4 - AGND | Analog ground reference | Signal ground for CS, DIM, EN, and VCC-must be separated from PGND and joined at single point |
| 5 - EN | Enable logic input | Active-high enable (≥2.0V); pulls supply current below 1µA when low-supports system-level power sequencing |
| 6 - DIM | PWM dimming control | Direct brightness control input (≥2.0V enables output); overrides EN state-enables flicker-free dimming |
| 7 - PGND | Power ground return | High-current return path for MOSFET and inductor; must be routed separately from AGND to minimize noise coupling |
| 8 - LX | Switch node | Drain of internal MOSFET; connects to inductor and Schottky diode anode-requires short, low-inductance routing |
| EP | Exposed thermal pad | Internally connected to PGND; must be soldered to PCB ground plane using ≥4 vias for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for external compensation components and avoids loop stability issues in varying LED VF conditions |
| High-side current sensing | Preserves common-cathode LED string configuration and enables accurate current regulation regardless of output voltage headroom |
| Dedicated DIM pin with 20kHz support | Enables seamless integration with microcontroller PWM outputs without additional signal conditioning or filtering |
| Integrated 5V regulator | Reduces BOM count by powering internal logic-eliminates need for external bias supply in most 12V lighting applications |
| Over-temperature protection | Shuts down output at 165°C and auto-recovers after 20°C cooldown-prevents thermal runaway in sealed luminaires |
Applications
| Architectural Lighting | MR-16 LED Bulbs |
|---|---|
Use Scenario: Linear LED strips mounted in aluminum extrusions for retail display accent lighting. IC Role / Device Role / Timing Role: Constant-current step-down driver regulating four 1A LEDs in series with high-side sensing to maintain uniform brightness across variable line voltage (12V ±10%). Use Value: ±5% current accuracy ensures consistent lumen output across units; 1MHz switching allows compact 22µH inductor placement within tight extrusion profiles. |
Use Scenario: Retrofit 12V AC/DC MR-16 replacement bulbs with integrated driver and thermal management. IC Role / Device Role / Timing Role: Primary LED current controller operating from rectified 12V DC input, using DIM pin for trailing-edge phase-cut dimmer compatibility. Use Value: Hysteretic control provides fast transient response to dimmer-induced input ripple; 8-pin ePAD SOIC enables high-power density layout with minimal thermal resistance. |
| Street Lighting Subsystems | Garden/Pathway Lighting |
Use Scenario: Outdoor LED street light module with 24V nominal input and ambient temperature range −40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability constant-current driver supporting four-series 1A LEDs, leveraging −40°C to +125°C junction rating and thermal shutdown for unattended operation. Use Value: 165°C thermal shutdown with 20°C hysteresis prevents permanent damage during summer thermal stress; high-side sensing avoids ground loop interference in metal pole-mounted fixtures. |
Use Scenario: Low-voltage (12V) solar-powered garden lights with PWM-dimming based on ambient light sensor output. IC Role / Device Role / Timing Role: Efficient LED driver accepting variable 6V–20V input from battery+boost converter, using EN pin for dusk-to-dawn enable/disable and DIM for adaptive brightness scaling. Use Value: 1.75mA typical supply current and <1µA shutdown current extend battery life; 6V minimum input supports operation down to partially discharged 12V lead-acid batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | Boost topology with 40V output capability; no integrated MOSFET-requires external 1A switch; ±3% current accuracy | Suitable for higher-VF LED strings (>20V) where step-up is needed; less suitable for 12V direct-drive MR-16 | Select AL8862SP-13 only when driving >3-series white LEDs from 12V or when needing programmable current via resistor divider |
| LM3409HVMM/NOPB | Buck controller (external MOSFET); supports 6V–75V input; ±2% current accuracy; requires compensation network | Offers higher input voltage tolerance and design flexibility but increases component count and layout complexity | Choose LM3409HVMM/NOPB for 48V industrial lighting or when thermal derating of external FET is preferred over integrated solution |
Compared with AL8862SP-13 and LM3409HVMM/NOPB, the MIC3201YME delivers simpler implementation for 6V–20V, 1A LED loads due to its integrated MOSFET, hysteretic control, and high-side sensing-reducing bill-of-materials count and eliminating compensation design effort.
Availability
MIC3201YME is available at Aetrix Electronics and suitable for architectural lighting, MR-16 LED bulbs, and solar-powered garden lighting requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MIC3201YME 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 specializing in power management, timing, and interface solutions before its acquisition by Microchip Technology in 2015.
The MIC3201YME belongs to Micrel's high-brightness LED driver product line, engineered specifically for cost-sensitive, thermally constrained general illumination applications requiring high efficiency, wide input range, and robust dimming capability.
FAQ
What is the maximum LED string voltage supported by the MIC3201YME?
The MIC3201YME does not specify a fixed maximum LED string voltage-it operates as a step-down regulator whose output compliance depends on input voltage minus forward drops. With 20V input and typical Schottky diode (0.4V) and sense resistor (0.2V) losses, it can drive up to four 1A white LEDs (≈12V total VF) while maintaining regulation. The MIC3201YME datasheet confirms operation with 1A LED loads across its full 6V–20V input range.
Can the MIC3201YME be used with PWM dimming frequencies above 1kHz?
Yes-the MIC3201YME supports PWM dimming up to 20kHz, as confirmed in its Electrical Characteristics table (FDIM = 20kHz). Its DIM pin responds to logic-level signals with fast turn-on/turn-off times (<300µs start-up), enabling flicker-free dimming even at high frequencies. This makes the MIC3201YME suitable for applications requiring silent, high-resolution brightness control without audible noise.
Is an external Schottky diode mandatory for MIC3201YME operation?
Yes-an external Schottky diode is mandatory. The MIC3201YME uses a synchronous or asynchronous buck topology with an internal high-side MOSFET but no integrated freewheeling path. The datasheet explicitly specifies a Schottky diode (e.g., SS24) connected between LX and the LED cathode to complete the current path during MOSFET off-time. Omitting it will cause failure due to lack of current recirculation.
How is LED current set on the MIC3201YME?
LED current is set by an external high-side current sense resistor (RCS) connected between VIN and CS pins. The MIC3201YME regulates current by comparing the voltage drop across RCS to internal thresholds (VCS(MAX) = 224mV, VCS(MIN) = 171mV). For 1A output, a 0.2Ω resistor yields ≈200mV drop-matching the hysteresis center and achieving ±5% accuracy as specified for the MIC3201YME.
Does the MIC3201YME require external compensation components?
No-the MIC3201YME uses a hysteretic (bang-bang) control architecture that requires no external compensation components. Its operation relies solely on the internal current sense comparator and fixed hysteresis window (35mV), eliminating the need for feedback networks, compensation capacitors, or stability analysis. This simplifies design and improves reliability across temperature and LED VF variation-core to the MIC3201YME's value proposition.
MIC3201YME Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 20V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MIC3201YME FAQ
1.How can I place an order for MIC3201YME through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3201YME 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 MIC3201YME reliable?
The price and inventory of MIC3201YME are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3201YME is usually 5 days.
3.What payment methods are accepted for MIC3201YME?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3201YME transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3201YME?
MIC3201YME orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3201YME 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 MIC3201YME?
For technical support, including MIC3201YME datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3201YME requirements.
6.How does Aetrix verify that MIC3201YME is sourced from the original manufacturer or authorized distributors?
All MIC3201YME 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 MIC3201YME meets industry standards.
7.What is the process for return or replacement of MIC3201YME?
All MIC3201YME units undergo pre-shipment inspection (PSI). If there is an issue with MIC3201YME, 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 MIC3201YME part is unused and in its original packaging.
Return procedure for MIC3201YME:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3201YME Tags
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