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Microchip Technology MSL2024-INR
- Part No.:
- MSL2024-INR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MSL2024-INR.pdf
- Description:
- IC LED DRIVER OFFL PWM 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,596
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Product details
Overview
MSL2024-INR from Microchip Technology is a dual-string LED driver IC designed for high-CRI, 2-color LED luminaires-featuring independent PWM dimming inputs (PWM1/PWM2), adaptive headroom control via FBO feedback, ±3% main-string current accuracy, and floating buck regulation for the color-adjust string. It drives external N-channel MOSFETs in linear (main) and buck (color-adjust) topologies for architectural downlights and PAR lamps.
For engineers reviewing the MSL2024-INR datasheet, MSL2024-INR pinout, MSL2024-INR application, or MSL2024-INR equivalent, this page delivers verified technical context on individual PWM dimming support (60Hz–22kHz main / 100Hz–500Hz color-adjust), I²C-configurable 8-bit DACs for current threshold tuning, open/short LED fault detection, and thermal shutdown at 133°C with 15°C hysteresis.
Technical Context
The MSL2024-INR implements two independent regulation loops: a high-accuracy linear current sink for the main (e.g., white) LED string using S-pin sensing and G/D/PGND terminals, and a constant off-time floating buck controller for the color-adjust string using CS/DRV/TOFF/REXT pins. Its efficiency optimizer (FBO) dynamically adjusts the LED power supply voltage to minimize linear regulator overhead.
Unlike the MSL2023, the MSL2024-INR accepts asynchronous external PWM signals-PWM1 directly controls main-string duty cycle (min 2µs on-time), while PWM2 sets color-adjust string brightness within its specified frequency band. All configuration, fault status (FAULTSTAT 0x23), and EEPROM-backed register settings (MREF/CAREF) are accessible via I²C (SCL/SDA) at up to 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 9.5V to 15V AVIN/PVIN - powers analog and gate-drive circuitry without external LDOs |
| Main String Current Accuracy | ±3% - achieved with 200mV S-pin reference and 1% sense resistor, enabling stable lumen output |
| PWM Dimming Range | 1% to 100% duty cycle - supports deep dimming without flicker in both strings |
| Dimming Input Frequency | PWM1: 60Hz–22kHz; PWM2: 100Hz–500Hz - accommodates MCU- or timer-generated signals |
| Fault Detection | Open/short LED detection on color-adjust string + thermal shutdown at 133°C - FLTB pin asserts low for system-level fault signaling |
| Operating Temperature | −40°C to +105°C ambient - validated for enclosed high-CRI luminaires with minimal heatsinking |
| I²C Interface | Standard-mode (100 kHz) and fast-mode (400 kHz) compatible - enables real-time current calibration and fault logging |
Pinout & Package
MSL2024-INR is housed in a thermally enhanced 24-pin 4×4 mm QFN package with exposed pad (EP) tied to PGND/AGND. Pin functions are electrically isolated between analog (AGND) and power (PGND) domains; CGND pins (3, 8, 12) must be connected to AGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBO (Pin 1) | Efficiency Optimizer Feedback Output | Sinks current to adjust AC/DC or DC/DC output voltage-connects to feedback node of upstream converter to minimize linear regulator dropout |
| EN (Pin 2) | Enable Input (Active High) | Initiates 250ms startup sequence; toggling EN clears FLTB faults without I²C interaction |
| PWM1 (Pin 3) | Main String PWM Dimming Input | Directly modulates main LED brightness; supports 2µs minimum pulse width across full 60Hz–22kHz range |
| SCL/SDA (Pins 4–5) | I²C Serial Interface | Configures MREF/CAREF DACs, reads FAULTSTAT (0x23), and stores settings to EEPROM for power-up defaults |
| FLTB (Pin 6) | Fault Indicator (Open Drain) | Asserts low on color-adjust string open/short or die overtemperature-requires external pull-up for system-level monitoring |
| S (Pin 18) | Main String Source Sense | Connects to source of main-string N-MOSFET and current-sense resistor; regulates current via 200mV default threshold |
| G/D/PGND (Pins 19–20, 14) | Main String Gate Drive & Power Path | G drives MOSFET gate up to VIN − 2.0V; D connects to drain; PGND returns high-current gate drive and buck switch paths |
| CS/DRV/TOFF (Pins 13, 15, 10) | Color-Adjust Buck Control | CS senses current via external resistor; DRV drives floating buck MOSFET gate; TOFF sets constant off-time with RTOFF |
Key Features
| Feature | Design Value |
|---|---|
| Independent PWM Inputs | Eliminates need for internal PWM generator-enables flexible MCU-based dimming profiles per string without phase synchronization constraints |
| Adaptive Headroom Control | FBO feedback reduces linear regulator power loss by dynamically lowering VLED to just above required forward voltage sum |
| 8-bit DAC Programmability | MREF and CAREF registers (0x20/0x21) allow fine-tuning of current thresholds from 194mV to 206mV in 2mV steps for binning compensation |
| Floating Buck Topology | Enables color-adjust string operation at lower voltage than main string-supports warm-white/amber blending without separate supplies |
| Integrated Fault Protection | Dedicated open/short detection on color-adjust string plus thermal shutdown ensures safe operation in sealed fixtures |
Applications
| Architectural Downlights | High-CRI Recessed Fixtures |
|---|---|
|
Use Scenario: Commercial office ceiling downlights requiring tunable white (2700K–5000K) with >90 CRI. IC Role / Device Role / Timing Role: MSL2024-INR independently dims white and amber LED strings via PWM1/PWM2 to blend correlated color temperature while maintaining lumen consistency. Use Value: Achieves smooth CCT transition across 100:1 dimming range without color shift-enabled by ±3% current matching and adaptive headroom minimizing thermal drift. |
Use Scenario: Residential recessed lighting with DALI or 0–10V dimming interface requiring local PWM translation. IC Role / Device Role / Timing Role: MSL2024-INR acts as PWM translator and current regulator-accepts MCU-generated PWM1/PWM2 signals derived from analog dimming input. Use Value: Enables retrofit compatibility with legacy dimmers while delivering high-precision current control unattainable with analog dimming alone. |
| PAR30/38 Lamps | Smart Color-Tunable Luminaires |
|
Use Scenario: Directional PAR lamps for retail display lighting needing precise spectral tuning. IC Role / Device Role / Timing Role: MSL2024-INR regulates main white LEDs and color-adjust red/green/blue strings using discrete PWM inputs per channel. Use Value: Supports multi-channel color mixing with independent dimming resolution-leveraging I²C-accessible DACs to calibrate per-string current offsets. |
Use Scenario: IoT-connected luminaires with wireless control requiring remote fault reporting and parameter updates. IC Role / Device Role / Timing Role: MSL2024-INR provides fault telemetry (via FLTB and FAULTSTAT register) and runtime current adjustment through I²C interface. Use Value: Enables cloud-based predictive maintenance-thermal and LED fault events logged via I²C reduce field service calls. |
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-INR | Internal 400Hz phase-shifted PWM generator; no external PWM inputs-uses register-controlled dimming only | Fixed-frequency dimming simplifies EMI filtering but lacks flexibility for MCU-synchronized or audio-reactive lighting | Select MSL2023-INR when deterministic 180° out-of-phase dimming is required and external PWM generation is unavailable |
| IS31FL3728-QFLS2 | 16-channel linear LED driver with integrated PWM engine; no adaptive headroom or floating buck capability | Limited to low-voltage, low-power RGBW arrays-not suitable for high-voltage main+color-adjust string architectures | Choose IS31FL3728-QFLS2 only for compact, low-cost multi-color indicator applications where VLED < 20V and headroom optimization is unnecessary |
Compared with MSL2024-INR, MSL2023-INR trades external PWM flexibility for deterministic timing and reduced MCU pin count, while IS31FL3728-QFLS2 offers higher channel density at the cost of missing critical high-power features like adaptive voltage control and fault-aware buck regulation.
Availability
MSL2024-INR is available at Aetrix Electronics and suitable for architectural downlights, high-CRI recessed fixtures, and PAR lamp designs requiring stable component supply, long-term BOM continuity, and RoHS-compliant packaging.
Supply support for MSL2024-INR 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-INR belongs to Microchip's Atmel LED Driver product line, engineered specifically for high-CRI, two-string tunable-white luminaires requiring adaptive power optimization and independent digital dimming control.
FAQ
What is the primary function of the FBO pin on the MSL2024-INR?
The FBO (Feedback Output) pin on the MSL2024-INR sinks current to dynamically adjust the output voltage of an upstream AC/DC or DC/DC converter-reducing the voltage applied to the main LED string to just above its forward voltage sum. This adaptive headroom control minimizes power dissipation in the linear current regulator. The MSL2024-INR uses FBO feedback to maintain optimal efficiency across varying LED forward voltages and temperatures, and the MSL2024-INR datasheet specifies FBO full-scale current as 170–340 µA.
How does the MSL2024-INR differ from the MSL2023-INR in dimming architecture?
The MSL2024-INR accepts asynchronous external PWM signals on dedicated PWM1 and PWM2 pins for independent, real-time brightness control of each LED string-supporting 60Hz–22kHz on PWM1 and 100Hz–500Hz on PWM2. In contrast, the MSL2023-INR generates internal 400Hz PWM with 180° phase shift between strings and relies on register writes via I²C. This makes the MSL2024-INR ideal for systems with existing PWM sources, while the MSL2023-INR suits fixed-frequency, low-pin-count implementations. Both share identical pinout and package.
Can the MSL2024-INR drive both LED strings simultaneously with different current levels?
Yes-the MSL2024-INR supports independent current programming for each string using two 8-bit DACs: MREF (register 0x20) sets the main string current sense threshold (default 200 mV), and CAREF (register 0x21) sets the color-adjust string threshold (also default 200 mV). Each DAC adjusts in 2 mV steps, allowing precise current matching or intentional offset-for example, setting main string current to 350 mA and color-adjust to 120 mA for warm-white blending. The MSL2024-INR maintains ±3% accuracy on the main string with proper sense resistor selection.
What fault conditions does the MSL2024-INR detect and how are they signaled?
The MSL2024-INR detects open-circuit and short-circuit faults on the color-adjust LED string, plus die overtemperature (>133°C). All faults assert the open-drain FLTB pin low and set corresponding bits in the read-only FAULTSTAT register (0x23). Faults can be cleared by toggling the EN pin or writing to the FAULT register (0x22) via I²C. The MSL2024-INR does not monitor main string open faults directly-instead, excessive VLED rise indicates failure-but thermal protection remains active across both channels.
Is the MSL2024-INR compatible with standard I²C buses and what are its timing limits?
Yes-the MSL2024-INR supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C communication, with maximum SCL clock frequency of 1 MHz per datasheet. It includes noise suppression filters (50 ns) on SDA/SCL, bus timeout (25 ms), and defined setup/hold times (e.g., tSU:DAT = 100 ns). The MSL2024-INR requires external pull-ups on SDA/SCL and operates with VDD = 2.5 V, making it compatible with 3.3 V and 5 V microcontrollers when level-shifted. All register access-including MREF, CAREF, and FAULTSTAT-is performed over this interface.
MSL2024-INR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-INR FAQ
1.How can I place an order for MSL2024-INR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSL2024-INR 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-INR reliable?
The price and inventory of MSL2024-INR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSL2024-INR is usually 5 days.
3.What payment methods are accepted for MSL2024-INR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSL2024-INR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSL2024-INR?
MSL2024-INR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSL2024-INR 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-INR?
For technical support, including MSL2024-INR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSL2024-INR requirements.
6.How does Aetrix verify that MSL2024-INR is sourced from the original manufacturer or authorized distributors?
All MSL2024-INR 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-INR meets industry standards.
7.What is the process for return or replacement of MSL2024-INR?
All MSL2024-INR units undergo pre-shipment inspection (PSI). If there is an issue with MSL2024-INR, 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-INR part is unused and in its original packaging.
Return procedure for MSL2024-INR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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