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Microchip Technology MIC3231YTSE-TR
- Part No.:
- MIC3231YTSE-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MIC3231YTSE-TR.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,936
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Product details
Overview
MIC3231YTSE-TR from Micrel is a constant-current boost switching controller for high-power LED strings, featuring 6V–45V input range, programmable 100kHz–1MHz switching frequency via external resistor, 250mV ±3% feedback reference, and integrated dithering for EMI reduction. It drives external MOSFETs to deliver up to 70W and supports PWM dimming up to 500Hz in street lighting and architectural illumination systems.
For engineers reviewing the MIC3231YTSE-TR datasheet, MIC3231YTSE-TR pinout, MIC3231YTSE-TR application, or MIC3231YTSE-TR equivalent, key selection criteria include its dither-enabled EMI suppression, OVP/UVLO/thermal shutdown protection, 16-pin EPAD TSSOP package with exposed thermal pad, and compatibility with boost or SEPIC topologies for series-connected LEDs.
Technical Context
The MIC3231YTSE-TR implements peak current mode control with slope compensation set by an external resistor (RSLC), enabling stable operation across wide duty cycles. Its internal gate driver delivers 2Ω source / 3.5Ω sink impedance to drive large external FETs efficiently.
It features dedicated pins for current sensing (IS), feedback (IADJ), frequency setting (FS), and overvoltage protection (OVP) - all referenced to separate analog (AGND) and power (PGND) grounds. The dither function shifts switching frequency by ±12% to spread conducted EMI spectrum, reducing peak emissions by ~10dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 45V - supports 12V/24V/36V industrial and street-lighting supplies without pre-regulation. |
| Feedback Reference Voltage | 250mV ±3% - enables precise LED current regulation via external sense resistor with minimal drift. |
| Switching Frequency | 100kHz to 1MHz (programmable) - allows trade-off between efficiency (lower fSW) and component size (higher fSW). |
| Dither Range | ±12% frequency shift - spreads EMI energy across bandwidth to meet CISPR-15 Class B conducted emission limits. |
| OVP Threshold | 1.24V typical - protects LED string and output capacitor against open-load overvoltage failure. |
| Junction Temp Range | –40°C to +125°C - qualified for outdoor solid-state lighting enclosures with passive heatsinking. |
| Enable Threshold | 1.5V min turn-on, 0.4V max turn-off - compatible with standard logic-level microcontrollers and optocouplers. |
Pinout & Package
The MIC3231YTSE-TR is housed in a 16-pin EPAD TSSOP package with exposed thermal pad (EPAD) connected to AGND for enhanced thermal dissipation in high-power LED drivers.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16, N/C | No Connect | Unused pins; must remain unconnected per datasheet. |
| 2 VIN | Power Input | Primary supply rail (6–45V); decoupled with ≥4.7µF ceramic capacitor near pin. |
| 3 EN | Enable Control | Logic-high (>1.5V) enables regulator; logic-low (<0.4V) shuts down IC with <30µA quiescent current. |
| 4 PWMD | PWM Dimming Input | Accepts 0–500Hz PWM signal; controls LED brightness without color shift; threshold 0.75V/0.4V. |
| 5 COMP | Compensation Output | Connects to external RC network (e.g., 10nF + 10kΩ) for loop stability in boost topology. |
| 6 IADJ | Current Sense Feedback | Monitors voltage across external current-sense resistor (RADJ); regulates LED current to VFB/RADJ. |
| 7 FS | Frequency Select | Resistor-to-ground sets oscillator frequency (100kHz–1MHz); 16.5kΩ = 500kHz typical. |
| 8 AGND | Analog Ground | Reference for IADJ, COMP, PWMD, EN; isolated from PGND to minimize noise coupling. |
| 9 OVP | OVP Divider Tap | Connects to top of resistive divider from VOUT; triggers shutdown when OVP pin reaches 1.24V. |
| 10 PGND | Power Ground | Return path for DRV, IS, and external FET source; tied to EPAD for thermal conduction. |
| 11 DRV | Gate Driver Output | Drives external N-channel MOSFET gate; 7–11V swing at VIN=12V; 2Ω source / 3.5Ω sink impedance. |
| 12 IS | Current Sense Input | Monitors voltage across external RCS resistor; provides slope compensation ramp (250µA/T) and current limit at 0.45V. |
| 13, 14, 15 SYNC/NC | Synchronization Output / No Connect | SYNC pin unused on MIC3231; must be left floating (not connected) per datasheet. |
| EPAD | Thermal Pad | Exposed copper pad under package; soldered to PCB copper pour tied to AGND for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low EMI dithering | ±12% frequency modulation reduces peak conducted emissions by ~10dB - critical for streetlight EMC compliance. |
| Programmable LED current | Set via external RADJ resistor; supports 100mA–1.5A+ LED strings using VFB/RADJ equation with 250mV reference. |
| Robust protection suite | Includes OVP (1.24V), UVLO (4.9V typ), thermal shutdown (150°C), and cycle-by-cycle current limiting (0.45V IS threshold). |
| High-efficiency gate drive | Low-impedance DRV output (2Ω/3.5Ω) minimizes switching losses when driving large external MOSFETs in 70W systems. |
| Flexible topology support | Configurable as boost (VOUT > VIN) or SEPIC (VOUT > or < VIN) - enables single-driver solutions for variable-input LED arrays. |
Applications
| Street Lighting | Architectural Lighting |
|---|---|
Use Scenario: Outdoor LED luminaires powered from 24V or 36V DC distribution lines in municipal infrastructure. IC Role / Device Role / Timing Role: Constant-current boost controller regulating 350mA–700mA through 6–12 series-connected white LEDs. Use Value: Dithering ensures CISPR-15 Class B compliance without added EMI filters; thermal shutdown prevents field failures in sealed enclosures. | Use Scenario: Color-tunable façade lighting with multiple independent LED channels requiring precise current matching. IC Role / Device Role / Timing Role: Primary LED current controller in multi-channel constant-current driver modules with PWM dimming interface. Use Value: 250mV ±3% feedback reference enables <±5% channel-to-channel current variation across temperature. |
| Solid-State Streetlamps | Industrial High-Bay Lighting |
Use Scenario: Retrofit LED lamp assemblies replacing HID fixtures in parking garages and tunnels. IC Role / Device Role / Timing Role: High-voltage boost controller delivering up to 100V output from 12–45V input to drive long LED strings. Use Value: 45V max input accommodates automotive 24V systems and solar-charged battery banks with voltage ripple. | Use Scenario: Warehouse lighting with 100–200W LED arrays operating from 24V/48V industrial power rails. IC Role / Device Role / Timing Role: Primary current controller in thermally constrained metal-housed luminaires with forced-air or passive cooling. Use Value: EPAD TSSOP package with θJA = 36.5°C/W enables 70W operation without active cooling in ambient ≤55°C. |
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 |
|---|---|---|---|
| LM3410XMM/NOPB | Fixed 1.6MHz switching frequency; no dither; lower max input (24V); integrated 1.5A FET. | Better suited for low-power (<15W), space-constrained designs; lacks OVP and thermal shutdown. | Select when board area is critical and input voltage stays below 24V; not suitable for 45V streetlight inputs or EMI-sensitive environments. |
| LT3756EMSE#TRPBF | Higher input range (6–100V); supports buck-boost-sepic; includes soft-start and fault reporting; no dither. | Targeted at high-reliability industrial and automotive LED systems requiring diagnostics and wider VIN. | Choose for mission-critical applications needing fault flag output and extended input range; higher cost and complexity than MIC3231YTSE-TR. |
Compared with LM3410XMM/NOPB and LT3756EMSE#TRPBF, the MIC3231YTSE-TR uniquely balances EMI reduction (dither), thermal robustness (125°C TJ), and cost-effective discrete-FET scalability for 30–70W LED systems - making it optimal for outdoor lighting where regulatory compliance and long-term reliability dominate.
Availability
MIC3231YTSE-TR is available at Aetrix Electronics and suitable for street lighting, architectural illumination, and industrial high-bay LED systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MIC3231YTSE-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 ICs, and timing solutions.
The MIC323x family was designed specifically for constant-current, high-power LED lighting applications - emphasizing thermal resilience, EMI control, and flexible topology support in harsh environmental deployments.
FAQ
What is the maximum output power achievable with the MIC3231YTSE-TR?
The MIC3231YTSE-TR is rated to deliver up to 70W to the LED system when paired with appropriately sized external components - including a low-RDS(on) MOSFET, 47µH inductor, and 100V-rated output capacitor. Actual power depends on input voltage, thermal design, and efficiency; at 12V input and 80% efficiency, sustained output exceeds 60W in well-cooled EPAD TSSOP layouts.
Does the MIC3231YTSE-TR support synchronous rectification?
No, the MIC3231YTSE-TR does not support synchronous rectification. It is designed as a controller for external N-channel MOSFETs in boost or SEPIC topologies, where the output rectifier remains a Schottky diode. The DRV pin drives only the main switch; no second gate driver or timing control for synchronous FETs is provided.
Can the MIC3231YTSE-TR be used in a buck configuration?
No, the MIC3231YTSE-TR is not designed for buck operation. Its architecture is optimized for boost and SEPIC topologies only - confirmed by functional block diagram, current-sense placement, and lack of low-side driver capability. Attempting buck use would violate internal current-mode control assumptions and likely cause instability or failure.
What is the purpose of the SYNC pin on the MIC3231YTSE-TR?
The SYNC pin on the MIC3231YTSE-TR is not functional and must be left floating (unconnected). Unlike the MIC3230, the MIC3231 does not support synchronization; this pin is reserved and unused per the official datasheet Pin Description table - connecting it may cause undefined behavior or latch-up.
How does the dither feature in the MIC3231YTSE-TR reduce EMI?
The dither feature in the MIC3231YTSE-TR modulates the switching frequency by ±12% around its nominal value, spreading electromagnetic energy across a wider bandwidth instead of concentrating it at harmonics of a fixed frequency. This lowers peak conducted emissions by approximately 10dB - directly easing compliance with CISPR-15 and FCC Part 15 Class B requirements for outdoor LED lighting.
MIC3231YTSE-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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:
- 100kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MIC3231YTSE-TR FAQ
1.How can I place an order for MIC3231YTSE-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3231YTSE-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 MIC3231YTSE-TR reliable?
The price and inventory of MIC3231YTSE-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3231YTSE-TR is usually 5 days.
3.What payment methods are accepted for MIC3231YTSE-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3231YTSE-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3231YTSE-TR?
MIC3231YTSE-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3231YTSE-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 MIC3231YTSE-TR?
For technical support, including MIC3231YTSE-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3231YTSE-TR requirements.
6.How does Aetrix verify that MIC3231YTSE-TR is sourced from the original manufacturer or authorized distributors?
All MIC3231YTSE-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 MIC3231YTSE-TR meets industry standards.
7.What is the process for return or replacement of MIC3231YTSE-TR?
All MIC3231YTSE-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3231YTSE-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 MIC3231YTSE-TR part is unused and in its original packaging.
Return procedure for MIC3231YTSE-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3231YTSE-TR Tags
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