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Microchip Technology MIC3232YMM
- Part No.:
- MIC3232YMM
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC3232YMM.pdf
- Description:
- IC LED DRIVER CTRLR PWM 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
MIC3232YMM from Micrel is a constant-current boost switching controller for high-power LED strings, operating from 6V to 45V input and delivering up to 70W with ±3% current regulation accuracy, fixed 400kHz switching frequency, and integrated gate driver (2Ω source / 3.5Ω sink) - used in street lighting and architectural solid-state lighting systems.
For engineers reviewing the MIC3232YMM datasheet, MIC3232YMM pinout, MIC3232YMM application, or MIC3232YMM equivalent, this page delivers verified technical context, real-world design meaning of key specs, package-validated pin functions, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The MIC3232YMM implements peak current mode control for superior line transient response and simplified loop compensation. It uses an external MOSFET driven by a low-impedance gate driver referenced to VDD, with internal soft-start (6µA charging current), leading-edge blanking (100ns), and slope compensation set via RSLC.
Its feedback architecture centers on a 250mV ±3% reference at IADJ, enabling precise LED current programming via RADJ. Protection includes overvoltage (1.24V OVP threshold), thermal shutdown (150°C), and UVLO (4.9V turn-on), all operating across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 45V - supports wide-range DC inputs including 12V/24V/36V industrial and automotive supplies. |
| Switching Frequency | Fixed 400kHz (±40kHz) - enables compact magnetics and EMI filtering while balancing efficiency and size. |
| Feedback Reference | 250mV ±3% - sets LED current accuracy directly; 0.35A output requires 714Ω RADJ with <3% tolerance. |
| Gate Driver Strength | 2Ω source / 3.5Ω sink - drives large external N-channel MOSFETs with fast rise/fall times, reducing switching losses. |
| OVP Threshold | 1.24V ±3% at OVP pin - protects LEDs and FET from overvoltage faults; programmable via resistor divider. |
| Thermal Shutdown | 150°C with 5°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| UVLO Threshold | 4.9V turn-on, 3.5V turn-off - ensures stable startup and graceful shutdown under brownout conditions. |
Pinout & Package
Package: 10-pin MSOP (3mm × 3mm, exposed pad), θJA = 130.5°C/W, rated for –40°C to +125°C junction operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 6–45V DC; powers internal circuitry and gate driver; bypass with ≥4.7µF ceramic capacitor. |
| EN | Enable control | Logic-high (≥1.5V) enables operation; logic-low (≤0.4V) shuts down IC, drawing only 30µA quiescent current. |
| PWMD | PWM dimming input | Accepts 0–500Hz PWM signal; controls LED brightness without color shift; threshold 0.75V/1.5V. |
| COMP | Compensation node | Connects external RC network (e.g., 10nF + 10kΩ) to stabilize current loop; voltage reaches ~0.7V at soft-start end. |
| IADJ | Current sense feedback | Monitors voltage across RADJ; regulates LED current to maintain 250mV; input bias current ≤3µA. |
| IS | Current sense input | Inputs ramped voltage (VCS + VA) for peak current mode control and cycle-by-cycle current limiting at 0.45V. |
| OVP | Overvoltage protection | Monitors output via resistor divider; triggers regulation clamp at 1.24V to prevent LED/FET overvoltage failure. |
| PGND | Power ground | Return path for high-current FET switching; must be separated from AGND and tied to EPAD for thermal performance. |
| DRV | Gate drive output | Drives external N-MOSFET gate; capable of >1A peak current; requires low-inductance layout to minimize ringing. |
| VDD | Internal LDO output | Internally regulated bias rail (~5V); requires 10µF ceramic capacitor to GND; no external load permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current regulation | 250mV ±3% reference enables <±5% total LED current error across temp and line, critical for consistent lumen output. |
| Fixed-frequency operation | 400kHz switching eliminates external frequency-setting resistor, simplifying BOM and improving production consistency. |
| Integrated gate driver | 2Ω source / 3.5Ω sink impedance reduces MOSFET switching time, lowering conduction and transition losses in high-power designs. |
| Comprehensive protection suite | OVP, UVLO, thermal shutdown, and cycle-by-cycle current limit enable robust field operation without external supervision circuitry. |
| Peak current mode control | Enables inherent line regulation, fast transient response to input changes, and simplified Type II compensation design. |
Applications
| Street Lighting | Solid-State Lighting |
|---|---|
Use Scenario: Outdoor LED luminaires powered from 24V or 36V DC distribution systems in municipal infrastructure. IC Role / Device Role / Timing Role: Constant-current boost controller regulating 0.35A through 6–12 series-connected white LEDs. Use Value: Maintains uniform brightness across temperature swings and input voltage variation, meeting IESNA LM-79 photometric stability requirements. | Use Scenario: Commercial indoor troffer and panel lights using high-CRI LEDs with analog-compatible dimming interfaces. IC Role / Device Role / Timing Role: Primary LED current controller with PWM dimming support up to 500Hz and separate EN shutdown for system-level power management. Use Value: Enables flicker-free dimming down to 1% without color shift, satisfying ENERGY STAR V2.1 and DLC Premium requirements. |
| Architectural Lighting | Constant Current Power Supplies |
Use Scenario: Linear LED strips and cove lighting in hospitality and retail environments requiring precise current matching across multiple zones. IC Role / Device Role / Timing Role: High-efficiency boost controller driving parallel LED strings with individual current regulation per channel. Use Value: Delivers <±3% current matching between channels using matched RADJ resistors, ensuring uniform chromaticity in multi-color installations. | Use Scenario: Industrial test equipment and lab-grade current sources needing stable, adjustable DC current outputs. IC Role / Device Role / Timing Role: Programmable constant-current source with external sense resistor and precision 250mV reference. Use Value: Achieves 0.1% current setting resolution with 0.01Ω sense resistors, supporting calibration-grade current sourcing up to 5A with external FET. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current boost LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3410XMF/NOPB | 3.0–42V input, 1.6MHz fixed freq, 200mV ref, integrated 1.5A FET - no external MOSFET required. | Lower power (<15W), no OVP or dither; suited for single-string portable lighting, not multi-string street fixtures. | Select when board space is constrained and output power ≤15W; avoid for >30W or OVP-critical systems. |
| LT3756EMSE#PBF | 6–100V input, 100kHz–1MHz programmable freq, 100mV ref, 75V gate drive - supports SEPIC/buck-boost topologies. | Higher voltage capability and dual-mode operation; used in automotive headlamps and emergency lighting with wide VIN transients. | Select when input exceeds 45V or topology flexibility (SEPIC/buck-boost) is required; adds complexity vs. fixed-frequency simplicity. |
Compared with LM3410XMF/NOPB and LT3756EMSE#PBF, the MIC3232YMM offers optimal balance of 70W capability, fixed 400kHz timing for predictable EMI, and full protection set - making it preferred for cost-sensitive, thermally demanding outdoor LED drivers where external FET selection enables scalability.
Availability
MIC3232YMM is available at Aetrix Electronics and suitable for street lighting, architectural lighting, and solid-state lighting applications requiring stable component supply, long-term lifecycle support, and traceable Pb-free sourcing.
Supply support for MIC3232YMM 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 acquired by Microchip Technology in 2015; known for high-reliability power management and LED driver ICs.
The MIC323x family was designed specifically for high-efficiency, constant-current boost conversion in high-power LED lighting - emphasizing thermal robustness, protection integration, and ease of current programming for industrial-grade luminaires.
FAQ
What is the maximum output power achievable with the MIC3232YMM?
The MIC3232YMM supports up to 70W output power when paired with an appropriately rated external MOSFET, inductor, and diode. This assumes optimal thermal management (≤125°C junction), 45V input, and proper layout to minimize switching losses. Real-world designs typically achieve 50–65W continuously due to PCB thermal limits and efficiency derating.
Does the MIC3232YMM support synchronization with other controllers?
No, the MIC3232YMM does not support frequency synchronization. Unlike the MIC3230, it lacks a SYNC pin. Its fixed 400kHz oscillator operates independently, so multiple MIC3232YMM units in one system will run at slightly different frequencies unless externally synchronized via PWM dimming signals or master clock injection - which is not supported in the datasheet.
What is the purpose of the IS pin on the MIC3232YMM?
The IS pin on the MIC3232YMM serves dual functions: it receives the summed voltage of the current sense resistor (VCS) and the slope compensation ramp (VA) for peak current mode control, and it triggers cycle-by-cycle current limiting when the voltage reaches 0.45V. This ensures stable operation and protects against inductor saturation or short-circuit events.
Can the MIC3232YMM be used in SEPIC topology?
Yes, the MIC3232YMM can be configured in SEPIC topology per the functional description in its datasheet. While optimized for boost operation, its peak current mode architecture and external switch control allow SEPIC implementation - enabling output voltages both above and below VIN. Layout and compensation must follow Micrel's SEPIC design guidelines, particularly for slope compensation and transformer coupling.
What is the recommended minimum value for the RADJ resistor in MIC3232YMM designs?
The MIC3232YMM datasheet specifies a maximum feedback input current of 3µA at IADJ. To maintain accuracy and avoid loading errors, RADJ should be ≤100kΩ for typical 0.35A designs (yielding 250mV drop). Lower values (e.g., 1kΩ–10kΩ) improve noise immunity but increase power dissipation; 714Ω is standard for 0.35A. Values below 500Ω risk exceeding IADJ bias current limits and degrading regulation.
MIC3232YMM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 45V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 400kHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MIC3232YMM FAQ
1.How can I place an order for MIC3232YMM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3232YMM 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 MIC3232YMM reliable?
The price and inventory of MIC3232YMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3232YMM is usually 5 days.
3.What payment methods are accepted for MIC3232YMM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3232YMM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3232YMM?
MIC3232YMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3232YMM 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 MIC3232YMM?
For technical support, including MIC3232YMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3232YMM requirements.
6.How does Aetrix verify that MIC3232YMM is sourced from the original manufacturer or authorized distributors?
All MIC3232YMM 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 MIC3232YMM meets industry standards.
7.What is the process for return or replacement of MIC3232YMM?
All MIC3232YMM units undergo pre-shipment inspection (PSI). If there is an issue with MIC3232YMM, 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 MIC3232YMM part is unused and in its original packaging.
Return procedure for MIC3232YMM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3232YMM Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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