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Microchip Technology MIC3201YME-TR
- Part No.:
- MIC3201YME-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MIC3201YME-TR.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,332
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Product details
Overview
MIC3201YME-TR from Micrel Inc. is a hysteretic step-down constant-current LED driver IC with high-side current sensing, integrated 1A power MOSFET, ±5% LED current accuracy, 6–20V input range, and up to 1MHz switching frequency-designed for driving up to four 1A HB LEDs in architectural lighting, MR-16 bulbs, and 12V pathway lighting systems.
For engineers reviewing the MIC3201YME-TR datasheet, MIC3201YME-TR pinout, MIC3201YME-TR application, or MIC3201YME-TR equivalent, key selection criteria include high-side sense resistor programmability, PWM dimming support up to 20kHz, thermal shutdown at 165°C, and compatibility with Schottky freewheeling diodes in compact 8-pin ePAD SOIC layouts.
Technical Context
The MIC3201YME-TR implements a hysteretic (bang-bang) control architecture without error amplifier or loop compensation, enabling fast transient response and inherent stability across wide input voltage (6–20V) and load conditions. Its internal 5V regulator powers analog circuitry, while high-side current sensing via external RCS resistor ensures ±5% LED current accuracy independent of VIN variation.
Operation relies on dual current thresholds (VCS(MAX) = 224mV, VCS(MIN) = 171mV) to toggle the integrated 300–550mΩ MOSFET, generating variable-frequency switching (up to 1MHz) determined by inductor value, LED string voltage, and thermal conditions. DIM and EN pins provide independent logic-level PWM brightness control and global enable/disable functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.0V to 20V - supports 12V lighting systems including MR-16, under-cabinet, and garden lighting without external pre-regulation. |
| LED Current Accuracy | ±5% - achieved via high-side current sense amplifier and precise VCS thresholds, enabling consistent luminance across temperature (-40°C to +125°C). |
| Switching Frequency | Up to 1MHz - allows use of small 22µH inductors and compact ceramic capacitors, reducing board area and BOM cost. |
| Internal Power Switch | 1A rated MOSFET with RDS(ON) = 300–550mΩ - eliminates need for external switch; supports up to four 1A LEDs in series. |
| PWM Dimming | 20kHz max DIM frequency - enables flicker-free brightness control with >100:1 dimming ratio using standard microcontroller PWM outputs. |
| Thermal Protection | 165°C shutdown with 20°C hysteresis - prevents damage during sustained overloads or poor heatsinking in enclosed fixtures. |
| VCC Regulator | 5V output - powers internal analog circuitry; requires 1µF ceramic bypass capacitor between VCC and AGND for stable operation. |
Pinout & Package
Package: 8-pin ePAD SOIC (ME) with exposed thermal pad (EP) connected to PGND - provides low thermal resistance (θJC = 14.7°C/W) for high-power LED driver operation in thermally constrained environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Voltage regulator output | 5V supply for internal analog circuitry; must be bypassed with 1µF ceramic cap to AGND - not for external loading. |
| CS | High-side current sense input | Connects to external RCS resistor; senses voltage drop across RCS to regulate LED current with ±5% accuracy. |
| VIN | Main input power supply | 6–20V input source for both power stage and internal regulator; requires 10µF ceramic bypass to PGND near pin. |
| AGND | Analog ground reference | Signal ground for CS, DIM, EN, and VCC circuits - must be separated from PGND and joined at single point. |
| EN | Enable control input | Logic-high (≥2.0V) enables regulation; logic-low (<0.4V) disables output and reduces quiescent current to <1µA. |
| DIM | PWM dimming input | Directly controls LED on/off duty cycle; active high (≥2.0V), overrides EN state when low - enables precise brightness control. |
| PGND | Power ground return | High-current return path for MOSFET and inductor; must be routed separately from AGND with minimal loop area. |
| LX | Switch node output | Drain of internal MOSFET; connects to inductor and Schottky diode anode - high dv/dt node requiring careful layout. |
| EP | Exposed thermal pad | Internally connected to PGND; must be soldered to PCB ground plane via ≥4 vias for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control topology | No external compensation required - simplifies design, eliminates instability risks, and delivers sub-microsecond load transient response. |
| High-side current sensing | Enables accurate LED current regulation independent of LED cathode voltage or ground-referenced layout constraints. |
| Dedicated DIM and EN pins | Allows independent hardware-level brightness control (DIM) and system-level on/off sequencing (EN) without firmware intervention. |
| Integrated 5V linear regulator | Eliminates need for external bias supply; powers internal comparators, references, and gate drivers from VIN with low noise and tight regulation. |
| Over-temperature protection | Auto-shutdown at 165°C with 20°C hysteresis - protects device and LEDs during thermal overload without external sensors. |
Applications
| Architectural Lighting | MR-16 LED Bulbs |
|---|---|
Use Scenario: Linear LED strips mounted in aluminum extrusions for retail display walls and office ceiling coves. 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 despite varying input impedance. Use Value: ±5% current accuracy ensures consistent lumen output across units; 1MHz switching enables compact 22µH inductor placement within narrow extrusion profiles. | Use Scenario: Retrofit 12V AC/DC MR-16 halogen replacement bulbs with integrated LED arrays. IC Role / Device Role / Timing Role: Primary HB LED driver converting 12V DC to regulated current for 3–4 series-connected LEDs, with DIM pin accepting PWM from legacy triac-dimmer interfaces. Use Value: High efficiency (>90%) minimizes thermal buildup inside sealed bulb housings; -40°C to +125°C junction rating supports operation in enclosed, high-ambient environments. |
| Garden/Pathway Lighting | Channel Letters |
Use Scenario: Solar-powered outdoor path lights with 12V battery input and dusk-to-dawn PWM dimming. IC Role / Device Role / Timing Role: Low-quiescent-current (1µA shutdown) LED driver enabling multi-day battery operation; DIM pin synchronized to light sensor output. Use Value: Ultra-low shutdown current extends battery life; 6V minimum input supports operation down to partially discharged 12V lead-acid batteries. | Use Scenario: Illuminated storefront channel letters powered from 12V DC supplies with remote brightness adjustment. IC Role / Device Role / Timing Role: Constant-current source for long LED strings (up to 4×1A), with high-side sensing accommodating common-anode configurations and ground-referenced controllers. Use Value: High-side sensing eliminates need for isolated current-sense amplifiers; ePAD SOIC package enables reliable thermal transfer to metal letter housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409MM/NOPB | Requires external MOSFET; uses current-mode control with compensation network; lower max input (40V) but wider dimming range (100Hz–20kHz). | Preferred for higher-power (>4A) or multi-string designs where layout flexibility and thermal isolation of power switch are critical. | Select LM3409MM/NOPB when external FET control, adjustable frequency, or higher output current capability is required - not a pin-compatible replacement. |
| AL8862SP-13 | Integrated 1.5A switch; fixed 500kHz frequency; no internal VCC regulator - requires external 5V bias; ±3% current accuracy. | Better suited for cost-sensitive, fixed-frequency designs where external bias rail exists and tighter current tolerance is needed. | Choose AL8862SP-13 when 500kHz fixed switching and ±3% accuracy outweigh need for hysteretic simplicity and self-contained biasing. |
Compared with MIC3201YME-TR, LM3409MM/NOPB offers greater scalability but adds design complexity, while AL8862SP-13 trades hysteretic simplicity for tighter current tolerance and fixed-frequency EMI control - neither is pin-compatible, and all require revalidation of layout and thermal management.
Availability
MIC3201YME-TR is available at Aetrix Electronics and suitable for architectural lighting, MR-16 LED bulb replacements, and solar-powered garden lighting requiring stable component supply, RoHS-compliant packaging, and extended temperature operation.
Supply support for MIC3201YME-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 analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC3201 product line was designed specifically for high-efficiency, high-brightness LED lighting applications requiring simple, robust, and thermally resilient constant-current regulation in space-constrained 12V systems.
FAQ
What is the maximum number of LEDs the MIC3201YME-TR can drive?
The MIC3201YME-TR is specified to drive up to four 1A high-brightness LEDs in series. This assumes sufficient input voltage headroom - for example, with typical white LEDs at ~3.2V each, a 12.8V LED string requires minimum VIN ≥ ~14.5V considering dropout and sense resistor losses. The device's 6–20V input range and hysteretic control adapt dynamically to varying forward voltages across temperature and aging.
Does the MIC3201YME-TR require external compensation components?
No, the MIC3201YME-TR uses a hysteretic (bang-bang) control architecture that eliminates the need for external compensation networks. Its operation relies solely on internal current-sense thresholds (VCS(MAX)/VCS(MIN)) and the external RCS resistor to define the inductor current hysteresis window. This simplifies layout, improves stability across operating conditions, and accelerates load transient response without loop tuning.
How does the high-side current sensing in MIC3201YME-TR improve system design?
High-side current sensing in the MIC3201YME-TR allows the LED cathodes to be grounded - simplifying thermal management, enabling direct connection to metal heat sinks, and avoiding ground-referenced current-sense amplifier errors. It also supports common-anode LED configurations and eliminates the need for isolated sense amplifiers in multi-string or high-voltage LED systems, reducing component count and layout complexity.
What thermal considerations apply to the MIC3201YME-TR in continuous 1A operation?
In continuous 1A operation, the MIC3201YME-TR's internal MOSFET (RDS(ON) = 300–550mΩ) dissipates up to ~550mW. With θJC = 14.7°C/W and proper ePAD grounding to a 4-layer PCB ground plane, junction temperature rise remains within the -40°C to +125°C rating. Layout must minimize PGND loop inductance, use ≥4 thermal vias under EP, and avoid routing sensitive traces near LX to prevent thermal runaway or oscillation.
Can the MIC3201YME-TR operate from a 12V automotive supply with load dump transients?
The MIC3201YME-TR has an absolute maximum VIN rating of +22V, making it unsuitable for direct connection to unclamped 12V automotive systems where load dump transients exceed this limit. For automotive use, external protection - such as a TVS diode clamping at ≤20V or a pre-regulator - is required. Its operating range (6–20V) fits well in stabilized 12V subsystems like interior lighting modules with filtered supplies.
MIC3201YME-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-TR FAQ
1.How can I place an order for MIC3201YME-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3201YME-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 MIC3201YME-TR reliable?
The price and inventory of MIC3201YME-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3201YME-TR is usually 5 days.
3.What payment methods are accepted for MIC3201YME-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3201YME-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3201YME-TR?
MIC3201YME-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3201YME-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 MIC3201YME-TR?
For technical support, including MIC3201YME-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3201YME-TR requirements.
6.How does Aetrix verify that MIC3201YME-TR is sourced from the original manufacturer or authorized distributors?
All MIC3201YME-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 MIC3201YME-TR meets industry standards.
7.What is the process for return or replacement of MIC3201YME-TR?
All MIC3201YME-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3201YME-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 MIC3201YME-TR part is unused and in its original packaging.
Return procedure for MIC3201YME-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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