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Microchip Technology MIC3202YME-TR
- Part No.:
- MIC3202YME-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MIC3202YME-TR.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,557
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Product details
Overview
MIC3202YME-TR from Micrel is a hysteretic step-down constant-current LED driver IC with integrated 625 mΩ high-side MOSFET and high-side current-sense architecture, delivering ±5% LED current accuracy at up to 1 A across 6–37 V input, optimized for architectural lighting, MR-16 bulbs, and channel-letter signage.
For engineers reviewing the MIC3202YME-TR datasheet, MIC3202YME-TR pinout, MIC3202YME-TR application, or MIC3202YME-TR equivalent, this page delivers verified functional context, validated pin roles, real-world efficiency curves (≥90% at 12 V/1 A), dither-enabled EMI reduction, and precise selection guidance against comparable HB LED drivers.
Technical Context
The MIC3202YME-TR implements hysteretic (bang-bang) control without compensation components, using internal VCS(MAX)/VCS(MIN) thresholds (212 mV / 177 mV typ.) to regulate inductor current within a fixed hysteresis window. Its 5 V VCC regulator powers internal circuitry from VIN, while the LX pin directly drives the external inductor.
LED current is set by an external high-side sense resistor (RCS); switching frequency scales with input voltage, LED string voltage, and inductance-reaching up to 1 MHz. Frequency dithering (±12% of fSW) spreads EMI spectrum by modulating VCS threshold with ±6 mV pseudo-random offset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 37 V - supports 12 V/24 V/36 V lighting systems without external pre-regulation. |
| LED Current Accuracy | ±5% - achieved via high-side current sensing and on-chip amplifier, independent of LED forward voltage variation. |
| Switching Frequency | Up to 1 MHz - enables use of compact 47 µH inductors (e.g., TDK SLF10145T-470M1R4) and reduces board area. |
| Internal MOSFET RDS(ON) | 275–625 mΩ (typ./max) - limits conduction loss at 1 A; thermal design must account for 14.7°C/W θJC. |
| Current-Sense Thresholds | VCS(MAX) = 212 mV, VCS(MIN) = 177 mV - defines 35 mV hysteresis window for stable hysteretic regulation. |
| Operating Temperature | −40°C to +125°C junction - qualified for outdoor signage, street lighting, and industrial ambient environments. |
| EMI Reduction | Frequency dither enabled - spreads spectral energy over ±12% bandwidth, lowering peak EMI by >10 dB in conducted emissions. |
Pinout & Package
Package: 8-pin e-PAD SOIC (ME) with exposed thermal pad connected to PGND; RoHS-compliant NiPdAu lead finish and halogen-free mold compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Voltage regulator output | Supplies 5 V ±5% to internal analog circuitry; requires 1 µF ceramic bypass capacitor placed adjacent to AGND. |
| CS (Pin 2) | High-side current-sense input | Monitors voltage drop across external RCS resistor; Kelvin connection recommended to minimize PCB trace resistance error. |
| VIN (Pin 3) | Main power input | Accepts 6–37 V supply; connects to internal LDO and current-sense comparator reference; requires local 1 µF ceramic decoupling. |
| AGND (Pin 4) | Analog ground reference | Reference for VCC, CS, EN, DIM; must be isolated from PGND except at single-point star ground to avoid noise coupling. |
| EN (Pin 5) | Enable logic input | Active-high (≥2.0 V) control: disables output and reduces quiescent current to <5 µA when low. |
| DIM (Pin 6) | PWM dimming input | Directly gates output stage; supports 20 kHz max PWM frequency with 1–99% duty cycle for smooth brightness control. |
| PGND (Pin 7) | Power ground return | Low-impedance path for MOSFET source and Schottky diode cathode; must be routed separately from AGND with minimal loop area. |
| LX (Pin 8) | Switch node output | Drain of internal MOSFET; connects to inductor and Schottky diode anode; high dv/dt node requiring short, shielded routing. |
| e-PAD | Thermal & electrical ground | Exposed pad under package body; must be soldered to large PGND copper pour for thermal dissipation and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control topology | Eliminates need for external compensation network, simplifying layout and improving transient response to PWM dimming edges. |
| Integrated high-side MOSFET | Reduces BOM count and PCB footprint vs. controller-only solutions; RDS(ON) optimized for 1 A continuous LED current. |
| High-side current sensing | Enables floating LED string configuration (e.g., common-anode architecture) and avoids ground-referenced sensing errors. |
| Frequency dithering | Actively lowers EMI peaks by spreading switching energy across ±12% bandwidth-critical for FCC/CE compliance in lighting fixtures. |
| Over-temperature protection | Shuts down at 160°C junction with 20°C hysteresis, preventing thermal runaway during sustained overloads or poor heatsinking. |
Applications
| Architectural Lighting | LED Bulbs (MR-16) |
|---|---|
|
Use Scenario: Constant-current drive for multi-LED strings in façade accent lighting with 24 V DC input. IC Role / Device Role / Timing Role: Primary LED current regulator implementing hysteretic step-down conversion with dither-enabled EMI control. Use Value: Maintains ±5% current accuracy across 10:1 input range (12–36 V), enabling single-BOM support for multiple fixture voltages. |
Use Scenario: Retrofit replacement for halogen MR-16 lamps using 12 V AC/DC input and 3–4 white LEDs in series. IC Role / Device Role / Timing Role: High-efficiency (>90%) constant-current driver with integrated MOSFET and PWM dimming interface. Use Value: Eliminates need for external FET and sense amplifier, reducing bill-of-materials cost by 30% versus discrete solutions. |
| Channel Letters | Street Lighting Subsystems |
|
Use Scenario: Powering segmented LED arrays in illuminated signage with ambient temperature extremes (−40°C to +85°C). IC Role / Device Role / Timing Role: Robust LED driver with −40°C to +125°C junction rating and over-temperature shutdown. Use Value: Ensures reliable startup and regulation in uncontrolled outdoor enclosures where thermal management is limited. |
Use Scenario: Secondary-stage current regulation in solar-powered street light controllers with variable 18–36 V battery input. IC Role / Device Role / Timing Role: Wide-input buck LED driver supporting dynamic input voltage and PWM dimming for dusk-to-dawn operation. Use Value: Delivers stable 1 A LED current despite 20 V input swing, minimizing luminous flux variation across battery discharge cycle. |
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 |
|---|---|---|---|
| LM3409MY/NOPB | Controller-only (external MOSFET); no integrated FET; requires external current-sense amp and compensation. | Better thermal scalability for >2 A loads; higher BOM count and layout complexity. | Select LM3409MY/NOPB when >1.5 A LED current or custom thermal management is required. |
| AL8862SP-13 | Dedicated 1 A buck LED driver with integrated MOSFET but no frequency dither; fixed 500 kHz switching. | Lower EMI mitigation capability; less effective in noise-sensitive environments like medical or audio-adjacent installations. | Choose AL8862SP-13 only if dithering is unnecessary and strict cost optimization outweighs EMI certification risk. |
Compared with LM3409MY/NOPB and AL8862SP-13, the MIC3202YME-TR uniquely combines integrated MOSFET, high-side sensing, and frequency dithering in an 8-pin SOIC-enabling faster time-to-market for EMI-compliant, space-constrained lighting designs without sacrificing accuracy or thermal robustness.
Availability
MIC3202YME-TR is available at Aetrix Electronics and suitable for architectural lighting, LED bulb retrofits, and channel-letter signage requiring stable component supply, long-lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for MIC3202YME-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 specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.
The MIC3202YME-TR belongs to Micrel's high-brightness LED driver product line, designed specifically for efficient, accurate, and EMI-conscious constant-current regulation in commercial and industrial solid-state lighting systems.
FAQ
What is the maximum LED current supported by the MIC3202YME-TR?
The MIC3202YME-TR regulates LED current up to 1 A with ±5% accuracy, as confirmed by its VCS(MAX)/VCS(MIN) thresholds (212 mV / 177 mV) and internal MOSFET RDS(ON) rating (625 mΩ max). At 1 A, power dissipation in the MOSFET is ~625 mW-requiring adequate PCB copper area and thermal vias per the 8-pin e-PAD SOIC layout guidelines.
Does the MIC3202YME-TR support PWM dimming, and what is its maximum frequency?
Yes, the MIC3202YME-TR supports hardware PWM dimming via its dedicated DIM pin, with a maximum input frequency of 20 kHz. The DIM pin accepts logic-level signals (≥2.0 V high, ≤0.4 V low) and directly gates the output stage-enabling flicker-free dimming down to 1% duty cycle without affecting current regulation accuracy.
How does frequency dithering work in the MIC3202YME-TR, and why is it important?
The MIC3202YME-TR implements frequency dithering by pseudo-randomly modulating the VCS(MAX) threshold with ±6 mV offset, causing switching frequency to vary by ±12% around its nominal value. This spreads EMI energy across a wider spectrum, reducing peak emissions by >10 dB and easing compliance with FCC Part 15 and CISPR 15 standards for lighting products.
What is the purpose of the separate AGND and PGND pins on the MIC3202YME-TR?
The MIC3202YME-TR separates AGND (analog ground) and PGND (power ground) to prevent high-frequency switching noise from the MOSFET and Schottky diode from corrupting sensitive analog references (VCC regulator, current-sense amplifier). Layout requires routing AGND and PGND traces separately and connecting them at a single point near the IC's e-PAD to maintain signal integrity and regulation accuracy.
Can the MIC3202YME-TR drive more than one LED string, and how many LEDs can it support in series?
The MIC3202YME-TR is designed to drive a single LED string in series, supporting up to eight 1 A LEDs (e.g., 3.5 V each → 28 V total VF) from a 36 V input. It does not support multi-string configurations; parallel strings would require individual current-setting resistors and risk mismatch due to VF variation-making single-string topology mandatory for ±5% accuracy.
MIC3202YME-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):
- 37V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A
- 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
MIC3202YME-TR FAQ
1.How can I place an order for MIC3202YME-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3202YME-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 MIC3202YME-TR reliable?
The price and inventory of MIC3202YME-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3202YME-TR is usually 5 days.
3.What payment methods are accepted for MIC3202YME-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3202YME-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3202YME-TR?
MIC3202YME-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3202YME-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 MIC3202YME-TR?
For technical support, including MIC3202YME-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3202YME-TR requirements.
6.How does Aetrix verify that MIC3202YME-TR is sourced from the original manufacturer or authorized distributors?
All MIC3202YME-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 MIC3202YME-TR meets industry standards.
7.What is the process for return or replacement of MIC3202YME-TR?
All MIC3202YME-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3202YME-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 MIC3202YME-TR part is unused and in its original packaging.
Return procedure for MIC3202YME-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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