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Microchip Technology MSL2024-IN
- Part No.:
- MSL2024-IN
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MSL2024-IN.pdf
- Description:
- IC LED DRIVER OFFL PWM 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:389
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Product details
Overview
MSL2024-IN from Microchip Technology is a dual-string LED driver IC for high-CRI luminaires, featuring independent PWM1/PWM2 dimming inputs, adaptive headroom control via FBO feedback, ±3% main-string current accuracy, and operation across -40°C to +105°C. It drives white and color-adjust LED strings using a linear current sink (main) and floating buck controller (color), enabling tunable correlated color temperature in architectural lighting.
For engineers reviewing the MSL2024-IN datasheet, MSL2024-IN pinout, MSL2024-IN application, or MSL2024-IN equivalent, this page delivers verified technical context on individual PWM dimming, I²C-configurable 8-bit DACs, open/short LED fault detection, thermal shutdown behavior, and compatibility with isolated AC/DC PFC flyback topologies.
Technical Context
The MSL2024-IN implements two independent dimming control paths: PWM1 directly modulates the main string's linear current sink (G/S/D MOSFET interface), while PWM2 controls the color-adjust string's floating buck converter (DRV/CS/TOFF). Its efficiency optimizer uses FBO to dynamically regulate VLED by sourcing up to 340 µA into the AC/DC feedback node, minimizing voltage overhead across the main-string MOSFET.
Current regulation relies on two 8-bit DACs (MREF/CAREF registers) setting 200 mV default sense thresholds at S and CS pins, supporting ±3% accuracy with 1% external resistors. Fault handling includes open/short detection on the color-adjust string, active-low FLTB reporting, and I²C-accessible FAULTSTAT/FAULT registers for precise diagnostics and recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 9.5 V to 15 V AVIN/PVIN - powers analog and gate-drive circuitry without external LDOs |
| Main String Current Accuracy | ±3% - enables stable lumen output across temperature and line voltage variations |
| PWM Dimming Inputs | PWM1: 60 Hz–22 kHz; PWM2: 100 Hz–500 Hz - supports microcontroller-driven dimming with ≥2 µs minimum on-time |
| Fault Detection | Open/short LED on color-adjust string - triggers FLTB low and disables string without affecting main string operation |
| I²C Interface | 0.05–1000 kHz clock, 7-bit address - allows runtime configuration of DACs, fault masks, and EEPROM defaults |
| Operating Temperature | -40°C to +105°C - qualified for enclosed high-temperature LED fixture environments |
| Package | 24-pin 4×4 mm QFN with exposed pad - enables compact PCB layout and thermal dissipation via PGND/AGND copper planes |
Pinout & Package
MSL2024-IN is housed in a lead-free, RoHS-compliant 24-pin 4×4 mm QFN package with exposed thermal pad (EP) connected to PGND and AGND. Pin 1 (FBO) is top-left corner; pin numbering follows standard counter-clockwise sequence.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBO | Efficiency Optimizer Feedback Output | Sinks up to 340 µA to adjust AC/DC output voltage - connects to feedback divider of isolated PFC flyback |
| EN | Enable Input (Active High) | Initiates 250 ms startup sequence; toggling clears FLTB faults |
| PWM1 | Main String Dimming Input | Directly controls duty cycle of linear current sink - no internal oscillator required |
| PWM2 | Color-Adjust String Dimming Input | Drives floating buck converter - supports lower-frequency color-tuning signals |
| S | Main String Current Sense Input | Monitors source voltage of external N-MOSFET - sets 200 mV reference via MREF DAC |
| CS | Color-Adjust String Current Sense Input | Monitors source voltage of buck FET - sets 200 mV reference via CAREF DAC |
| DRV | Color-Adjust Buck Gate Driver Output | Drives gate of external N-MOSFET - operates with floating ground referenced to PGND |
| G | Main String MOSFET Gate Driver Output | Drives gate of external N-MOSFET - output swing up to VIN − 2.0 V |
| D | Main String MOSFET Drain Connection | Connects to drain of external N-MOSFET - handles full main-string current path |
| TOFF | Buck Off-Time Set Input | Resistor-to-ground sets constant off-time (e.g., 45.3 kΩ = 0.5 µs) - determines switching frequency stability |
Key Features
| Feature | Design Value |
|---|---|
| Independent PWM dimming per string | Eliminates need for external MCU-generated phase-shifted signals - simplifies system timing and reduces BOM count |
| Adaptive headroom control via FBO | Maintains minimal voltage overhead across main-string MOSFET - improves system efficiency by reducing conduction losses |
| 8-bit DAC programmable current references | Enables precise calibration of main and color-adjust string currents without changing external resistors |
| I²C-accessible EEPROM defaults | Preserves register settings across power cycles - ensures repeatable startup behavior without host initialization |
| Open/short LED fault detection | Isolates color-adjust string failures without disrupting main white-light output - enhances luminaire reliability |
Applications
| General & Architectural Lamps | High CRI LED Fixtures |
|---|---|
Use Scenario: Tunable-white downlights in commercial office spaces requiring smooth CCT shift from 2700K to 6500K. IC Role / Device Role / Timing Role: MSL2024-IN acts as dual-channel LED current controller - main string regulates intensity, color-adjust string fine-tunes chromaticity. Use Value: Achieves >90 CRI with <3-step MacAdam ellipse variation using calibrated 8-bit DACs and ripple-free linear current control. | Use Scenario: Museum-grade track lighting where spectral fidelity and dimming linearity are critical. IC Role / Device Role / Timing Role: MSL2024-IN provides independent PWM1/PWM2 dimming with >100:1 range - enables deep dimming without color shift. Use Value: Maintains constant current accuracy (±3%) and zero ripple across 0.1–100% dimming - preserves color point integrity at low light levels. |
| Down Lights & Recessed Lights | PAR Lamps |
Use Scenario: Thermally constrained residential recessed cans with integrated AC/DC PFC drivers. IC Role / Device Role / Timing Role: MSL2024-IN interfaces with isolated flyback via FBO feedback - adapts VLED to LED forward voltage drift over temperature. Use Value: Reduces thermal derating by minimizing MOSFET VDS - extends lifetime in sealed enclosures operating up to +105°C ambient. | Use Scenario: Outdoor PAR30/38 lamps exposed to wide ambient temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: MSL2024-IN monitors both strings for open/short faults - FLTB output triggers system-level safety response. Use Value: Enables fail-safe operation: color-adjust string disables on fault while main white string remains lit - maintains basic illumination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSL2023-IN | Internal 400 Hz phase-shifted PWM generator; no external PWM inputs - requires MCU to write registers instead of driving pins | Lacks direct PWM1/PWM2 hardware interface - less suitable for systems with dedicated dimming controllers or analog PWM sources | Select MSL2023-IN only when register-based dimming control and fixed 400 Hz frequency are acceptable design constraints |
| AL8862Q-13 | Single-channel buck-boost LED driver with I²C dimming - no second string or adaptive headroom control | Cannot drive independent white+color strings - limited to monochromatic or RGBW systems requiring external mixing logic | Choose AL8862Q-13 for cost-sensitive single-string designs where color tuning is handled externally or not required |
Compared with MSL2023-IN and AL8862Q-13, the MSL2024-IN uniquely supports hardware-synchronized dual PWM inputs and real-time FBO-based headroom optimization - making it the only option among the three for thermally efficient, high-CRI tunable-white luminaires with minimal MCU intervention.
Availability
MSL2024-IN is available at Aetrix Electronics and suitable for general and architectural lamps, high CRI LED fixtures, and down lights requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MSL2024-IN 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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and timing solutions for industrial, automotive, and lighting applications.
The MSL2024-IN belongs to Microchip's Atmel LED Driver product line, designed specifically for high-CRI, tunable-white LED luminaires requiring adaptive voltage control, independent string dimming, and robust fault management.
FAQ
What is the primary function of the FBO pin on the MSL2024-IN?
The FBO pin on the MSL2024-IN is the Efficiency Optimizer feedback output that sinks up to 340 µA to dynamically adjust the output voltage of an external AC/DC or DC/DC converter. This adaptive headroom control minimizes the voltage drop across the main-string MOSFET, reducing power loss and improving overall system efficiency. In every MSL2024-IN design, FBO must be connected to the feedback node of the LED power supply to enable this core functionality.
How does the MSL2024-IN achieve independent dimming for two LED strings?
The MSL2024-IN achieves independent dimming using dedicated hardware inputs: PWM1 directly controls the main string's linear current sink, while PWM2 drives the color-adjust string's floating buck converter. Unlike the MSL2023-IN, it does not rely on internal register-controlled PWM generation. This architecture allows asynchronous dimming signals with different frequencies (PWM1: 60 Hz–22 kHz; PWM2: 100 Hz–500 Hz), giving designers full flexibility in MSL2024-IN system timing and control topology.
What fault conditions does the MSL2024-IN detect and how are they reported?
The MSL2024-IN detects open-circuit and short-circuit faults on the color-adjust LED string, triggering the open-drain FLTB pin to pull low. Fault status is also accessible via I²C register 0x23 (FAULTSTAT), where bit 0 indicates short and bit 1 indicates open. Thermal shutdown (>147°C) puts the device to sleep while keeping I²C active. All faults can be cleared by toggling EN or writing to register 0x22. The MSL2024-IN does not monitor the main string for opens or shorts - only color-adjust string faults are actively detected.
Can the MSL2024-IN operate without an external microcontroller?
Yes, the MSL2024-IN can operate without an external microcontroller for basic functionality: EN can be tied to AVIN for automatic startup, PWM1/PWM2 can be driven directly by external dimming sources, and default DAC values (MREF/CAREF = 0x64 → 200 mV) provide immediate current regulation. However, advanced features like fault masking, EEPROM programming, or dynamic current adjustment require I²C communication. So while the MSL2024-IN supports standalone operation, full configurability of the MSL2024-IN demands I²C access.
What are the key thermal design considerations for the MSL2024-IN in high-power LED applications?
The MSL2024-IN operates from -40°C to +105°C ambient and includes thermal shutdown at 147°C junction temperature. To maintain reliability, the exposed pad (EP) must be soldered to a large copper plane connected to both PGND and AGND for effective heat transfer. Power dissipation is dominated by the main-string MOSFET's conduction loss, so minimizing VDS via FBO optimization is critical. Layout must place 1.0 µF bypass capacitors close to AVIN and PVIN, and 10 µF caps at VCC/VDD - all referenced to AGND. These practices ensure stable MSL2024-IN operation under continuous high-current loads.
MSL2024-IN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Type:
- AC DC Offline Switcher
- Topology:
- Flyback, Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 9.5V
- Voltage - Supply (Max):
- 15V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
MSL2024-IN FAQ
1.How can I place an order for MSL2024-IN through Aetrix?
Please submit a Request for Quotation (RFQ) for MSL2024-IN 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 MSL2024-IN reliable?
The price and inventory of MSL2024-IN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSL2024-IN is usually 5 days.
3.What payment methods are accepted for MSL2024-IN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSL2024-IN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSL2024-IN?
MSL2024-IN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSL2024-IN 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 MSL2024-IN?
For technical support, including MSL2024-IN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSL2024-IN requirements.
6.How does Aetrix verify that MSL2024-IN is sourced from the original manufacturer or authorized distributors?
All MSL2024-IN 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 MSL2024-IN meets industry standards.
7.What is the process for return or replacement of MSL2024-IN?
All MSL2024-IN units undergo pre-shipment inspection (PSI). If there is an issue with MSL2024-IN, 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 MSL2024-IN part is unused and in its original packaging.
Return procedure for MSL2024-IN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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