Microchip Technology MSL3162BT-R

Overview

MSL3162BT-R from Microchip Technology (formerly Atmel) is a 16-channel, high-efficiency LED string driver IC for LCD backlighting and signage. It sinks up to 100mA per string with ±3% current accuracy, supports 10-series white LEDs per string (160 total), and features adaptive Efficiency Optimizer control, 1MHz I²C/SMBus interface, and per-string PWM/phase control.

For engineers reviewing the MSL3162BT-R datasheet, MSL3162BT-R pinout, MSL3162BT-R application, or MSL3162BT-R equivalent, key selection considerations include its 40-pin TQFN package, 6-bit analog + 10-bit PWM dimming, open/short/over-temperature fault monitoring, 40V string voltage rating, and support for synchronized area dimming in direct-lit LCD TVs and medical displays.

Technical Context

The MSL3162BT-R integrates 16 precision current-sink MOSFETs with 40V breakdown rating and uses a patented Efficiency Optimizer architecture that dynamically adjusts external LED supply voltage via three FBO/FBI feedback channels. Its internal 20MHz oscillator feeds a DLL-based synchronization engine supporting VSYNC/HSYNC inputs for motion blur reduction.

It implements hierarchical dimming: global 6-bit intensity, per-string 8-bit PWM, and 8-bit thermal derating-multiplied to yield effective 10-bit resolution. Fault detection includes per-string open-circuit and short-circuit sensing, reported via dedicated FLTB pin and I²C register reads.

Key Specifications

Pinout & Package

MSL3162BT-R is housed in a lead-free, halogen-free, RoHS-compliant 40-pin TQFN (6mm × 6mm × 0.75mm, 0.5mm pitch) with exposed thermal pad (EP) connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED string driver applications.

Compared with TLC6983RTQR and ISL97693IRZ-T7A, the MSL3162BT-R uniquely combines adaptive power optimization, video-synchronized PWM phasing, and on-chip EEPROM - making it the only choice for high-dynamic-range, artifact-free direct-backlight systems demanding both efficiency and temporal precision.

Availability

MSL3162BT-R is available at Aetrix Electronics and suitable for televisions and desktop monitors, medical instrumentation, and automotive audio-visual displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MSL3162BT-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 manufacturing continuity for the MSL3162BT-R.

The MSL3162BT-R belongs to Microchip's high-performance LED backlight driver family, engineered specifically for LCD and OLED display systems requiring precise per-zone dimming, thermal resilience, and video-timing synchronization.

FAQ

What is the maximum number of LEDs the MSL3162BT-R can drive per string?

The MSL3162BT-R supports up to 10 series-connected white LEDs per string (based on 40V max string voltage and typical 3.6V forward voltage), or up to 15 red LEDs (2.4V VF). Total capacity is 160 LEDs per device. Driving more than 10 white LEDs requires verifying actual VF distribution and ensuring total string voltage stays below 40V. The MSL3162BT-R does not regulate above this limit.

How does the Efficiency Optimizer in the MSL3162BT-R improve system efficiency?

The Efficiency Optimizer in the MSL3162BT-R minimizes power loss in the current-sink MOSFETs by dynamically adjusting the external LED supply voltage via FBO/FBI feedback. It senses the highest-voltage string and drives the supply to just above that level - reducing unnecessary voltage headroom. This lowers conduction loss and heat generation, especially critical in high-current backlight designs where the MSL3162BT-R operates near its 2.1W thermal limit.

Can multiple MSL3162BT-R devices share the same I²C bus, and how many addresses are supported?

Yes, up to 16 MSL3162BT-R devices can share a single 1MHz I²C/SMBus interface. Address selection is controlled by AD0 and AD1 pins, offering 4 combinations (GND/VDD/SCL/SDA), and internal address offset logic expands the total to 16 unique slave addresses. Broadcast write commands allow simultaneous configuration of all connected MSL3162BT-R units - essential for frame-synchronized backlight control.

What fault conditions does the MSL3162BT-R monitor, and how are they reported?

The MSL3162BT-R monitors open-circuit, short-circuit, and over-temperature faults per LED string. Fault status is reported both via the open-drain FLTB pin (active-low, latched until cleared) and through dedicated I²C registers (OCSTAT0/1, SCSTAT0/1, FLTSTATUS). Individual fault enables (FLTMASK0/1) allow selective monitoring, and thermal cutoff activates at 135°C to protect the die. All fault data is accessible without interrupting normal operation.

Does the MSL3162BT-R support both RGB and monochrome LED configurations?

Yes, the MSL3162BT-R natively supports RGB LED backlights by assigning separate LED strings to red, green, and blue channels - each driven independently with matched current and synchronized PWM. Its 40V string rating accommodates typical RGB forward voltages (2.4V red, 3.2–3.6V green/blue), and the Efficiency Optimizer supports three independent feedback channels (FBO1–FBO3) to optimize voltage per color channel - maximizing color gamut and contrast in high-end displays.