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Microchip Technology MIC3232YMM-TR
- Part No.:
- MIC3232YMM-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC3232YMM-TR.pdf
- Description:
- IC LED DRIVER CTRLR PWM 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,201
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Product details
Overview
MIC3232YMM-TR from Micrel is a constant-current boost switching controller designed to drive high-power LED strings in solid-state lighting systems. It operates from 6V–45V input, delivers up to 70W output power, features fixed 400kHz switching frequency, 250mV ±3% feedback reference, and integrated OVP/UVLO/thermal shutdown protection - used in street lighting and architectural LED drivers.
For engineers reviewing the MIC3232YMM-TR datasheet, MIC3232YMM-TR pinout, MIC3232YMM-TR application, or MIC3232YMM-TR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions for MSOP-10 layout, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MIC3232YMM-TR implements peak current mode control in a fixed-frequency (400kHz) boost topology, enabling stable constant-current regulation for series-connected LEDs. Its internal gate driver delivers 2Ω source / 3.5Ω sink impedance to drive external MOSFETs efficiently, while the 250mV feedback reference minimizes sensing resistor power loss.
It supports PWM dimming up to 500Hz via the PWMD pin and low-power shutdown via EN (1.5V turn-on threshold). Protection includes overvoltage (1.24V OVP threshold), under-voltage lockout (4.9V typical UVLO), and thermal shutdown at 150°C with 5°C hysteresis - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 45V - accommodates 12V/24V/36V industrial and automotive LED power rails without pre-regulation. |
| Switching Frequency | Fixed 400kHz (360–440kHz tolerance) - balances efficiency vs. EMI and enables compact magnetics (e.g., 47µH inductor). |
| Feedback Reference | 250mV ±3% - enables precise LED current setting with low-power, low-value sense resistors (e.g., 0.71Ω for 350mA). |
| Output Power Capability | Up to 70W - supports multi-string, high-lumen LED arrays in street and architectural lighting. |
| OVP Threshold | 1.24V on OVP pin - sets output overvoltage limit via external resistor divider; protects LEDs and FET during open-circuit fault. |
| Thermal Shutdown | 150°C junction temperature - prevents damage during sustained overload or poor heatsinking; 5°C hysteresis ensures clean recovery. |
| PWM Dimming Frequency | DC to 500Hz - supports flicker-free dimming above 120Hz; maintains constant current per pulse for stable color point. |
Pinout & Package
Package: 10-pin MSOP (3mm × 3mm, exposed EPAD), rated for –40°C to +125°C junction temperature, θJA = 130.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 6–45V DC; connects to bulk input capacitor and high-side switch node. |
| EN | Enable control input | Logic-high ≥1.5V enables operation; ≤0.4V forces shutdown with 30µA quiescent current. |
| PWMD | PWM dimming input | Directly modulates LED current duty cycle; compatible with microcontroller GPIO or dedicated dimming ICs. |
| COMP | Compensation node | Connects external RC network (e.g., 10nF + 10kΩ) to stabilize current loop; soft-start time set by CCOMP. |
| IADJ | Current sense feedback input | Monitors voltage across external RADJ resistor; regulates LED current to VF/RADJ = 0.25V/RADJ. |
| IS | Current sense input | Connects to source of external MOSFET via RCS; senses peak inductor current for cycle-by-cycle limiting. |
| OVP | OVP divider node | Connects top of R8/R9 divider to output; triggers shutdown when divided output exceeds 1.24V. |
| PGND | Power ground | Return path for high-current FET switching; must be routed separately from AGND to minimize noise coupling. |
| DRV | Gate drive output | Drives external N-channel MOSFET gate; 2Ω source / 3.5Ω sink impedance supports fast switching with low losses. |
| VDD | Internal bias supply | Internally regulated rail; requires 10µF ceramic bypass to PGND - no external load permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current regulation | 250mV ±3% reference enables <±5% LED current accuracy across line/load/temperature with minimal sense resistor drift. |
| Integrated protection suite | OVP (1.24V), UVLO (4.9V), and thermal shutdown (150°C) operate autonomously - no external ICs or firmware required. |
| PWM dimming interface | Dedicated PWMD pin accepts 0–100% duty cycle signals up to 500Hz; preserves LED spectral stability vs. analog dimming. |
| High-efficiency gate drive | 2Ω source / 3.5Ω sink impedance drives standard logic-level MOSFETs directly - eliminates need for external driver stages. |
| Compact thermal package | 10-pin MSOP with exposed EPAD allows direct thermal connection to PCB copper - sustains 70W operation within 125°C TJ. |
Applications
| Street Lighting | Architectural 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 3–7 series high-brightness white LEDs at 350mA. Use Value: Fixed 400kHz operation enables small 47µH inductors and low-profile designs; OVP protects against open-circuit LED string faults. |
Use Scenario: Color-tunable or high-CRI linear LED strips mounted on building façades with strict EMI limits. IC Role / Device Role / Timing Role: Primary LED current controller in multi-channel constant-current drivers with independent PWM dimming per zone. Use Value: 250mV feedback reference minimizes I2R heating in current-sense resistors - critical for long continuous runs with tight thermal envelopes. |
| Solid-State Streetlights | Industrial High-Bay Lighting |
Use Scenario: Replace HID fixtures in parking lots and roadways using 48V battery-backed or solar-charged systems. IC Role / Device Role / Timing Role: Core boost controller managing up to 70W per channel, supporting wide VIN range (6–45V) during battery voltage sag. Use Value: UVLO (4.9V) prevents erratic startup during brownout; thermal shutdown (150°C) safeguards against enclosure overheating in sealed fixtures. |
Use Scenario: Warehouse lighting with high-lumen LED modules requiring robust overvoltage and thermal protection. IC Role / Device Role / Timing Role: Constant-current driver for 12–24V input systems powering parallel LED strings with individual current regulation. Use Value: Peak current mode control delivers superior line transient response - maintains stable LED current during generator or UPS switching events. |
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 |
|---|---|---|---|
| LM3410XMY/NOPB | Fixed 1.6MHz switching frequency; 200mV reference; no OVP; requires external current sense amplifier. | Better suited for space-constrained portable LED flashlights than high-power street lighting due to lower power capability (~25W max). | Select LM3410XMY/NOPB only if board area is critical and OVP is handled externally; not drop-in for MIC3232YMM-TR's 70W/45V use cases. |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100; integrated MOSFET; 3.3V–42V input; programmable 200–2000kHz frequency; 0.2V reference. | Designed for automotive headlamps and interior lighting; includes diagnostics (open/short LED detection) not present in MIC3232YMM-TR. | Choose TPS92630QPWPRQ1 for automotive OEM programs requiring ASIL-B compliance; MIC3232YMM-TR remains preferred for cost-sensitive industrial lighting. |
Compared with LM3410XMY/NOPB and TPS92630QPWPRQ1, the MIC3232YMM-TR offers higher power scalability (70W), built-in OVP/UVLO/thermal protection, and optimized 400kHz operation for industrial LED drivers - making it more suitable for non-automotive, high-reliability outdoor lighting where external protection complexity must be minimized.
Availability
MIC3232YMM-TR is available at Aetrix Electronics and suitable for street lighting, architectural LED systems, and industrial high-bay fixtures requiring stable component supply across multi-year production cycles.
Supply support for MIC3232YMM-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 acquired by Microchip Technology in 2015; known for high-performance LED drivers, power management, and timing solutions.
The MIC323x family was designed specifically for constant-current, high-power LED lighting applications - emphasizing wide input range, integrated protection, and simplified external component count for industrial and municipal lighting systems.
FAQ
What is the maximum output power supported by the MIC3232YMM-TR?
The MIC3232YMM-TR is rated to deliver up to 70W to the LED load. This capability assumes proper thermal management (PCB copper area, heatsinking), use of a low-RDS(on) external MOSFET, and operation within its 6V–45V input range. Real-world output depends on efficiency (typically ~80%), ambient temperature, and layout - but 70W represents the validated system-level power ceiling specified in the official Micrel datasheet for MIC3232YMM-TR.
Does the MIC3232YMM-TR include overvoltage protection, and how is it configured?
Yes, the MIC3232YMM-TR includes an internal overvoltage protection (OVP) circuit with a 1.24V threshold on the OVP pin. It is configured using an external resistor divider from VOUT to ground, where the midpoint connects to the OVP pin. When the divided voltage reaches 1.24V, the controller shuts down the DRV output to protect LEDs and the external FET - a critical safeguard during open-string faults. This OVP function is fully integrated and requires no additional ICs for MIC3232YMM-TR implementations.
Can the MIC3232YMM-TR be synchronized to other controllers?
No, the MIC3232YMM-TR does not support synchronization. Unlike the MIC3230, which includes a SYNC output pin, the MIC3232YMM-TR lacks both SYNC and FS (frequency select) pins - its oscillator is fixed at 400kHz and cannot be adjusted or aligned with other devices. For noise-sensitive multi-channel designs requiring synchronized switching, the MIC3230 or MIC3231 variants must be selected instead of MIC3232YMM-TR.
What is the purpose of the IADJ pin on the MIC3232YMM-TR?
The IADJ pin on the MIC3232YMM-TR serves as the current-sense feedback input for the constant-current regulation loop. It monitors the voltage drop across an external current-setting resistor (RADJ) placed in the LED return path. The controller adjusts the duty cycle to maintain exactly 250mV at IADJ - thereby delivering ILED = 0.25V / RADJ. This precision 250mV ±3% reference enables accurate, temperature-stable LED current control without calibration in MIC3232YMM-TR designs.
Is the MIC3232YMM-TR RoHS-compliant and lead-free?
Yes, the MIC3232YMM-TR is RoHS-compliant and Pb-free, as confirmed in Micrel's official ordering information table: "MIC3232YMM" is explicitly listed with "Lead Finish: Pb-Free". The "-TR" suffix denotes tape-and-reel packaging, consistent with standard RoHS-compliant manufacturing for this MSOP-10 device. No exemptions or leaded variants exist for MIC3232YMM-TR in the published product matrix.
MIC3232YMM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TR FAQ
1.How can I place an order for MIC3232YMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3232YMM-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 MIC3232YMM-TR reliable?
The price and inventory of MIC3232YMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3232YMM-TR is usually 5 days.
3.What payment methods are accepted for MIC3232YMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3232YMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3232YMM-TR?
MIC3232YMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3232YMM-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 MIC3232YMM-TR?
For technical support, including MIC3232YMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3232YMM-TR requirements.
6.How does Aetrix verify that MIC3232YMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC3232YMM-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 MIC3232YMM-TR meets industry standards.
7.What is the process for return or replacement of MIC3232YMM-TR?
All MIC3232YMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3232YMM-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 MIC3232YMM-TR part is unused and in its original packaging.
Return procedure for MIC3232YMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3232YMM-TR Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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LYT1604D-TL
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BCR421UFD-7
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