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Microchip Technology MSL2166-DU
- Part No.:
- MSL2166-DU
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 64-VFQFN Exposed Pad
- Datasheet:
-
MSL2166-DU.pdf
- Description:
- IC LED DRIVER LINEAR PWM 64TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,114
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Product details
Overview
MSL2166-DU from Microchip Technology (formerly Atmel) is a 16-string, high-efficiency LED driver IC designed for LCD TV backlight systems with advanced local dimming. It sinks up to 350mA per string with ±0.8% current matching, supports frame-synchronized PWM dimming via PHI/HSYNC inputs, and features three independent efficiency optimizer outputs (FBO1–FBO3) for adaptive DC-DC converter control in multi-rail architectures.
For engineers reviewing the MSL2166-DU datasheet, MSL2166-DU pinout, MSL2166-DU application, or MSL2166-DU equivalent, key selection considerations include its 20MHz SPI interface supporting up to eight daisy-chained devices, 12-bit per-string PWM resolution with forward/center/reverse/inverse dimming modes, and integrated EEPROM for configurable power-up defaults - all critical for motion blur reduction and dynamic contrast optimization in premium displays.
Technical Context
The MSL2166-DU implements a hybrid current regulation architecture: external N-channel MOSFETs handle high-voltage/high-current LED strings while internal circuitry precisely controls gate drive timing and drain/source sensing. Its 12-bit global intensity register and per-string 12-bit PWM registers enable fine-grained, video-frame-aligned dimming across 16 channels.
Unlike the MSL2164, the MSL2166-DU integrates three FBO outputs and one FBIN input for closed-loop adaptive power supply control across up to three independent DC-DC converters - enabling real-time efficiency optimization based on load conditions and thermal feedback. Its PHI/GSC synchronization engine supports frequency multiplication (1×–32×) to align PWM edges with VSYNC/HSYNC for artifact-free local dimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Strings | 16 parallel strings, each driven by external MOSFETs with source/drain sense inputs |
| Max String Current | 350mA per string, regulated via external current sense resistors (500mV full-scale) |
| Current Matching | ±0.8% string-to-string accuracy ensures uniform brightness and consistent white point |
| PWM Resolution | 12-bit per string + 12-bit global intensity register enables >4096-step dimming granularity |
| SPI Interface | 20MHz master-slave interface supporting up to 8 devices per CSB line for scalable backlight systems |
| Fault Detection | Per-string open-circuit, short-circuit, loss-of-sync, and over-temperature monitoring with FLTB output |
| Package | 64-pin TQFN (9 × 9 × 0.85 mm, 0.5 mm pitch) with exposed thermal pad for industrial-grade thermal management |
Pinout & Package
MSL2166-DU is housed in a 64-pin, 9 mm × 9 mm × 0.85 mm TQFN package with an exposed thermal pad (EP) connected to power ground. The package supports high-power dissipation required for driving 16 LED strings at up to 350mA each in compact TV backlight modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBO1–FBO3 | Efficiency Optimizer Outputs | Three independent analog outputs that dynamically adjust DC-DC converter feedback nodes to minimize power loss while maintaining current accuracy |
| FBIN1 | Efficiency Optimizer Input | Accepts FBO1 signal from upstream device in cascaded configurations to synchronize multi-supply optimization |
| PHI | Phase Synchronization Input | Accepts VSYNC (40 Hz–10 kHz) to lock PWM timing to video frame boundaries for motion artifact suppression |
| GSC | Gate Shift Clock Input | Accepts HSYNC (up to 1.5 MHz) to define PWM phase resolution and enable position-aligned local dimming |
| FLTB | Fault Output (Open Drain) | Active-low signal asserting on any detected fault (open/short LED, sync loss, over-temp); latched until status registers are read |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power Correction | 8-bit correction algorithm optimizes efficiency across up to three independent LED power supplies without sacrificing current accuracy |
| Four PWM Dimming Modes | Forward, center, reverse, and inverse modes programmable per string to reduce motion blur and waterfall noise in LCD panels |
| EEPROM Configuration Storage | On-chip EEPROM retains custom register defaults (e.g., string enables, fault masks, PWM settings) for reliable cold-start behavior |
| String Phase Spreading | Programmable 1/16-phase delay per string reduces peak input capacitor ripple and eases power supply design |
| Broadcast Write Support | Single SPI command updates identical registers across all daisy-chained devices, simplifying firmware for large-area backlights |
Applications
| TV Local Dimming Backlight | Medical Display Backlighting |
|---|---|
Use Scenario: High-end LCD TVs requiring >1000-zone local dimming for HDR content playback with minimal motion artifacts. IC Role / Device Role / Timing Role: Primary LED string controller synchronizing PWM dimming to VSYNC/HSYNC, managing 16 physical zones per chip, and coordinating up to 8 chips for 128-zone systems. Use Value: Enables >100,000:1 dynamic contrast ratio via precise per-string current control and phase-shifted PWM, directly improving perceived image depth and black level fidelity. |
Use Scenario: Diagnostic imaging monitors where color consistency, flicker-free operation, and long-term luminance stability are clinically mandated. IC Role / Device Role / Timing Role: Constant-current LED driver with ±0.8% matching and EEPROM-stored calibration data ensuring repeatable white point across device lifetime and temperature range. Use Value: Eliminates manual recalibration cycles by preserving factory-set intensity curves in nonvolatile memory, reducing service downtime and compliance risk. |
| Industrial Panel Backlight | Architectural Signage |
Use Scenario: Ruggedized HMI panels deployed in factory automation environments with wide ambient temperature swings (−40°C to +85°C). IC Role / Device Role / Timing Role: Fault-resilient LED driver performing real-time open/short detection per string and reporting via FLTB and SPI for predictive maintenance. Use Value: Prevents complete backlight failure by isolating faulty strings and maintaining partial illumination - critical for operational continuity in safety-critical interfaces. |
Use Scenario: Large-format outdoor signage using high-brightness LED arrays powered by multiple DC-DC rails with varying voltage requirements. IC Role / Device Role / Timing Role: Multi-supply coordinator using FBO1–FBO3 outputs to adaptively tune three independent converter feedback loops based on real-time LED load. Use Value: Reduces system-level power consumption by up to 12% compared to fixed-feedback designs, extending thermal margin and lowering cooling costs in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED string driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSL2164-DU | Two FBO outputs (FBO1/FBO2), no FBIN input; lacks third efficiency optimizer channel | Suitable for dual-rail backlight systems only; cannot support three independent DC-DC supplies | Select MSL2164-DU when system uses ≤2 LED power rails and cost optimization is prioritized over multi-supply flexibility |
| ISL97693IRZ-T7A | 12-string capacity, integrated MOSFETs (no external FETs), 10-bit PWM resolution | Targeted at mid-tier monitors; lacks per-string phase control and video-sync PWM modes | Choose ISL97693IRZ-T7A for space-constrained designs where integrated drivers suffice and advanced dimming modes are not required |
Compared with MSL2166-DU, MSL2164-DU offers reduced power supply coordination capability but lower BOM count, while ISL97693IRZ-T7A trades scalability and video-synchronization precision for integration density - making MSL2166-DU the only option supporting true 3-rail adaptive efficiency in 16-string, frame-synchronized TV backlight systems.
Availability
MSL2166-DU is available at Aetrix Electronics and suitable for LCD TV backlighting, medical display illumination, and industrial HMI panel lighting requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for MSL2166-DU 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 manufacturing continuity for the MSL216x family of LED drivers.
The MSL2166-DU belongs to Microchip's high-performance backlight controller product line, engineered specifically for premium LCD TV and professional display applications demanding precise current matching, video-synchronized dimming, and adaptive power efficiency.
FAQ
What is the maximum number of MSL2166-DU devices that can be daisy-chained on a single SPI bus?
The MSL2166-DU supports up to eight devices per Chip Select (CSB) line using its 20MHz SPI interface. Each device is assigned a unique address via the ADDR pin, enabling individual register access or broadcast writes across the chain. This scalability allows MSL2166-DU-based systems to drive up to 128 LED strings (16 × 8) while maintaining frame-synchronized dimming across all zones - a requirement for high-end TV local dimming architectures.
How does the MSL2166-DU achieve ±0.8% current matching between LED strings?
The MSL2166-DU achieves ±0.8% string-to-string current matching through precision external current sensing: each string's full-scale current is set by a dedicated current sense resistor, with the IC regulating to maintain exactly 500mV across it. Internal matched amplifier paths and digital calibration stored in EEPROM compensate for process variation. This matching is verified across temperature (−40°C to +85°C) and ensures consistent luminance and white point in MSL2166-DU-driven backlight systems.
What is the function of the FBIN1 pin on the MSL2166-DU?
The FBIN1 pin on the MSL2166-DU is an Efficiency Optimizer Input used exclusively in cascaded configurations. When chaining multiple MSL2166-DU devices, FBIN1 accepts the FBO1 output from the preceding device to synchronize adaptive power supply control across the entire chain. If unused, FBIN1 must be tied to ground. This feature enables coordinated efficiency optimization across multi-chip backlight systems - a capability absent in the MSL2164-DU and essential for large-panel implementations using MSL2166-DU.
Does the MSL2166-DU support both internal and external PWM generation?
Yes, the MSL2166-DU supports three PWM sources: (1) internally generated from the GSC clock with PHI synchronization, (2) externally applied via the PWM pin (0–5kHz), and (3) derived from the PHI input with optional frequency multiplication (1×–32×). All modes support the four programmable dimming waveforms (forward/center/reverse/inverse). This flexibility allows MSL2166-DU to operate in standalone mode or tightly integrate with video subsystems - a key differentiator versus fixed-function alternatives.
What fault conditions does the MSL2166-DU monitor, and how are they reported?
The MSL2166-DU monitors per-string open-circuit, short-circuit, loss-of-sync (PHI/GSC timeout), and over-temperature faults. Fault status is reported via the open-drain FLTB pin (active-low assertion) and detailed register mapping (FLTSTATUS, OCSTAT0/1, SCSTAT0/1). Each string's fault detection can be individually enabled/disabled via STRFLTEN0/1 registers. This dual-reporting mechanism - hardware interrupt plus SPI-accessible diagnostics - enables rapid fault isolation in MSL2166-DU-based systems without requiring continuous polling.
MSL2166-DU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 64-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 20MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFN (9x9)
MSL2166-DU FAQ
1.How can I place an order for MSL2166-DU through Aetrix?
Please submit a Request for Quotation (RFQ) for MSL2166-DU 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 MSL2166-DU reliable?
The price and inventory of MSL2166-DU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSL2166-DU is usually 5 days.
3.What payment methods are accepted for MSL2166-DU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSL2166-DU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSL2166-DU?
MSL2166-DU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSL2166-DU 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 MSL2166-DU?
For technical support, including MSL2166-DU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSL2166-DU requirements.
6.How does Aetrix verify that MSL2166-DU is sourced from the original manufacturer or authorized distributors?
All MSL2166-DU 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 MSL2166-DU meets industry standards.
7.What is the process for return or replacement of MSL2166-DU?
All MSL2166-DU units undergo pre-shipment inspection (PSI). If there is an issue with MSL2166-DU, 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 MSL2166-DU part is unused and in its original packaging.
Return procedure for MSL2166-DU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MSL2166-DU Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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