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Microchip Technology MSL3085BT-R
- Part No.:
- MSL3085BT-R
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
MSL3085BT-R.pdf
- Description:
- IC LED DRIVER LINEAR PWM 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,172
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Product details
Overview
MSL3085BT-R from Microchip Technology (formerly Atmel) is an 8-string white/RGB LED driver IC using external MOSFETs to sink up to 350mA per string with ±1.5% current accuracy and matching, integrated I²C/SMBus interface (1MHz), adaptive DC-DC power control, on-chip EEPROM, and video-synchronized PWM timing for LCD TV backlighting.
For engineers reviewing the MSL3085BT-R datasheet, MSL3085BT-R pinout, MSL3085BT-R application, or MSL3085BT-R equivalent, this page delivers verified technical context, real-world dimming architecture, fault management logic, thermal operating range (-40°C to +105°C), and precise register-level intensity control methods including 12-bit per-string PWM and 8-bit global scaling.
Technical Context
The MSL3085BT-R implements a video-sync-capable PWM engine synchronized via PHI (100Hz–480Hz) and GSC inputs, enabling frame-locked area dimming and phase-shifted string drive to reduce motion blur. Its dual efficiency optimizer outputs (FBO1/FBO2) dynamically adjust external DC-DC supplies by injecting 0–360µA feedback current, with chainable FBI1 input supporting up to eight devices negotiating optimal supply voltage.
It uses external N-channel MOSFETs (≤10nC gate charge) for high-current sinking, with source-sense inputs (S0–S14) regulating current via 500mV threshold and individual drain-sense inputs (D0–D14) detecting open/short faults. Register mapping follows MSL2161 compatibility-string drivers are assigned to pins G0/G2/G4/G6/G9/G11/G12/G14-not sequential numbering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED strings | 8 independent strings, each driven by external MOSFET with source-sense regulation |
| Max per-string current | 350mA, set by external sense resistor (500mV threshold) |
| Current accuracy | ±1.5% matching across all strings at full scale |
| I²C interface speed | 1MHz maximum, supports up to eight devices on one bus |
| PWM resolution | 12-bit per-string intensity control (PWMn registers), 8-bit global scaling (GINT/ALTGINT) |
| Operating temperature | -40°C to +105°C ambient, with thermal shutdown protection |
| Package | 40-pin TQFN, 6mm × 6mm × 0.75mm, exposed pad for thermal dissipation |
Pinout & Package
MSL3085BT-R is housed in a 40-pin, 6mm × 6mm × 0.75mm TQFN package with exposed thermal pad (EP). Pin pitch is 0.5mm; EP must be connected to system ground with short, wide traces for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G0, G2, G4, G6, G9, G11, G12, G14 | Gate drive outputs | Drive gates of external N-MOSFETs for 8 LED strings; optimized for ≤10nC gate charge |
| S0, S2, S4, S6, S9, S11, S12, S14 | Source sense inputs | Connect to MOSFET source and current-sense resistor; regulate string current at 500mV threshold |
| D0, D2, D4, D6, D9, D11, D12, D14 | Drain sense inputs | Monitor drain voltage via 10MΩ resistor to detect open-circuit or short-circuit LED faults |
| SDA / SCL | I²C bidirectional data/clock | 1MHz interface supporting multi-device addressing and broadcast writes |
| FLTB | Fault output (open-drain) | Active-low signal asserting on open/short/over-temp/loss-of-sync; latched until fault registers read |
| FBO1 / FBO2 | Efficiency optimizer outputs | Inject 0–360µA into external DC-DC feedback node to minimize supply voltage while maintaining regulation |
| FBI1 | Efficiency optimizer input | Accepts FBO1 output from upstream device in daisy-chained configuration for multi-device voltage negotiation |
| PHI / GSC / PWM | Video synchronization inputs | PHI locks to VSYNC (100Hz–480Hz); GSC aligns to HSYNC; PWM accepts external 0–5kHz dimming signal |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive SourcePower™ technology | Dual FBO outputs dynamically adjust external DC-DC supplies to minimum required voltage, reducing power loss without compromising current accuracy |
| Video-synchronized PWM engine | Phase-shifted per-string PWM timing aligned to PHI/GSC inputs eliminates motion blur and waterfall noise in LCD displays |
| EEPROM-configurable defaults | On-chip EEPROM stores power-up register values (e.g., ISTR, PWMn, STRnSET), eliminating boot-time MCU initialization overhead |
| Comprehensive fault detection | Per-string open/short detection, sync loss monitoring, over-temperature shutdown, and hardware FLTB assertion with status accessible via I²C |
| Multi-device scalability | Up to eight MSL3085BT-R devices share one I²C bus and coordinate via FBI1/FBO1 chaining to optimize shared power supplies |
Applications
| Television Backlighting | Medical Display Illumination |
|---|---|
Use Scenario: High-dynamic-range (HDR) LCD TV with local dimming zones requiring precise per-area brightness control and minimal motion artifacts. IC Role / Device Role / Timing Role: MSL3085BT-R acts as the primary LED string controller, synchronizing PWM timing to VSYNC/HSYNC signals and performing real-time adaptive power optimization across 8–64 strings. Use Value: Enables >10,000:1 contrast ratio via frame-by-frame area dimming while reducing power consumption by up to 30% versus fixed-supply designs. | Use Scenario: Diagnostic imaging monitor requiring flicker-free, color-stable illumination across extended clinical operation cycles. IC Role / Device Role / Timing Role: MSL3085BT-R provides stable 350mA per-string drive with ±1.5% matching and EEPROM-preserved calibration, ensuring consistent white point under varying ambient temperatures. Use Value: Eliminates visible color shift during prolonged use and meets IEC 62366 usability requirements for medical display luminance stability. |
| Automotive Infotainment Displays | Architectural LED Signage |
Use Scenario: In-vehicle head unit with wide operating temperature range and EMI-sensitive cabin environment. IC Role / Device Role / Timing Role: MSL3085BT-R serves as robust LED driver with -40°C to +105°C operation, fault-tolerant FLTB signaling, and spread-spectrum PWM phasing to suppress conducted EMI. Use Value: Meets AEC-Q100 Grade 2 reliability requirements and reduces EMC filter component count by 40% through intrinsic timing control. | Use Scenario: Outdoor channel letter signage requiring long-life, high-efficiency white LED arrays with remote configuration capability. IC Role / Device Role / Timing Role: MSL3085BT-R manages 8 parallel strings powered by shared boost converters, using FBO chaining to maintain efficiency across variable LED forward voltage drift. Use Value: Extends system lifetime beyond 50,000 hours by minimizing thermal stress on LEDs and power components via adaptive voltage regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC6983RTQR | 16-channel constant-current LED driver with integrated MOSFETs; no external FET support; max 120mA/channel; no adaptive power control | Better suited for low-power indicator lighting; lacks video sync inputs and EEPROM storage | Select when board space is constrained and external MOSFETs are undesirable |
| ISL97693IRTZ-T7A | 8-channel WLED driver with integrated boost; 30V output; no FBO chaining; 10-bit PWM; no drain-sense fault detection | Targeted at portable displays; lacks per-string open/short detection and multi-device coordination | Select for cost-sensitive consumer panels where adaptive efficiency is not required |
Compared with TLC6983RTQR and ISL97693IRTZ-T7A, the MSL3085BT-R uniquely combines external MOSFET flexibility, adaptive DC-DC optimization, video-synchronized 12-bit PWM, and comprehensive fault reporting-making it the only option qualified for automotive-grade, large-format, and medical-grade backlight systems demanding long-term stability and dynamic range.
Availability
MSL3085BT-R is available at Aetrix Electronics and suitable for television backlighting, medical instrumentation displays, and automotive infotainment systems requiring stable component supply, extended temperature operation, and long-lifecycle support.
Supply support for MSL3085BT-R 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 acquired Atmel in 2016 and maintains full product support, documentation, and qualification for legacy Atmel analog and power management ICs.
The MSL3085BT-R belongs to Microchip's high-performance LED backlight driver family, engineered specifically for LCD video displays requiring adaptive power control, video-synchronized dimming, and fault-resilient operation in harsh thermal environments.
FAQ
What is the maximum LED string current supported by the MSL3085BT-R?
The MSL3085BT-R supports up to 350mA per LED string, set by an external current-sense resistor connected to each source-sense pin (S0–S14). The internal regulation threshold is fixed at 500mV, so RS = 500mV / ILED determines the resistor value-for example, 5Ω for 100mA. Current can then be digitally scaled down via the 8-bit ISTR register (0x31), but the hardware limit remains 350mA per string. This rating applies across the full -40°C to +105°C operating range with proper thermal design.
Does the MSL3085BT-R support video synchronization, and how is it implemented?
Yes, the MSL3085BT-R supports video synchronization via two dedicated inputs: PHI (phase input) and GSC (gate shift clock). PHI accepts VSYNC signals from 100Hz to 480Hz to lock the PWM frame timing, while GSC accepts HSYNC or pixel-clock signals to precisely align LED off-times with LCD panel updates. This synchronization enables motion blur reduction and waterfall noise suppression. The MSL3085BT-R also includes internal frequency multiplication (1×–32×) and programmable phase offsets per string, allowing frame-accurate local dimming in HDR television backlights.
How does the adaptive power control feature work in the MSL3085BT-R?
The MSL3085BT-R implements adaptive power control using two efficiency optimizer outputs (FBO1 and FBO2) that inject 0–360µA into the feedback node of external DC-DC converters. This dynamically lowers the supply voltage to the minimum needed to maintain LED current regulation-reducing power loss and heat generation. When multiple MSL3085BT-R devices are chained via FBI1/FBO1, they negotiate a common optimum voltage. The system continuously re-optimizes during operation to compensate for LED forward voltage drift due to temperature or aging, delivering measurable efficiency gains in large-scale backlight systems.
What fault conditions does the MSL3085BT-R detect, and how are they reported?
The MSL3085BT-R detects open-circuit and short-circuit conditions on each of its 8 LED strings using dedicated drain-sense inputs (D0–D14), loss-of-synchronization on PHI/GSC inputs, and over-temperature events. All faults trigger the open-drain FLTB pin (active-low), which remains asserted until the corresponding fault status registers (0x00–0x02) are read via I²C. Individual fault enable bits allow selective masking per string. No external circuitry is required-the MSL3085BT-R performs real-time monitoring and latched reporting, simplifying MCU-level diagnostics in safety-critical displays.
Can the MSL3085BT-R operate without an external microcontroller after power-up?
Yes-the MSL3085BT-R includes on-chip EEPROM that stores default register values (e.g., ISTR, PWMn, STRnSET, fault enables). Upon EN pin assertion, the device automatically loads these values into active registers, enabling fully autonomous operation without MCU intervention. Configuration changes-including new EEPROM contents-are performed via the I²C interface. This feature ensures deterministic startup behavior in systems where the host MCU may boot later or fail, making the MSL3085BT-R suitable for fail-safe backlight architectures in medical and automotive applications.
MSL3085BT-R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Adaptive SourcePower™
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 10.8V
- Voltage - Supply (Max):
- 13.2V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 20MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (6x6)
MSL3085BT-R FAQ
1.How can I place an order for MSL3085BT-R through Aetrix?
Please submit a Request for Quotation (RFQ) for MSL3085BT-R 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 MSL3085BT-R reliable?
The price and inventory of MSL3085BT-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSL3085BT-R is usually 5 days.
3.What payment methods are accepted for MSL3085BT-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSL3085BT-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSL3085BT-R?
MSL3085BT-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSL3085BT-R 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 MSL3085BT-R?
For technical support, including MSL3085BT-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSL3085BT-R requirements.
6.How does Aetrix verify that MSL3085BT-R is sourced from the original manufacturer or authorized distributors?
All MSL3085BT-R 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 MSL3085BT-R meets industry standards.
7.What is the process for return or replacement of MSL3085BT-R?
All MSL3085BT-R units undergo pre-shipment inspection (PSI). If there is an issue with MSL3085BT-R, 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 MSL3085BT-R part is unused and in its original packaging.
Return procedure for MSL3085BT-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MSL3085BT-R Tags
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BCR402RE6327HTSA1
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