Microchip Technology MSL2162DQ

Overview

MSL2162DQ from Microchip Technology (formerly Atmel) is a 16-channel white/RGB LED string driver IC that sinks up to 350mA per string using external MOSFETs, delivers ±1.5% current accuracy and matching, integrates EEPROM for power-up defaults, and supports frame-synchronized 12-bit per-string PWM dimming via 20 MHz SPI. It is used in high-dynamic-range LCD TV backlights requiring adaptive area dimming and motion blur reduction.

For engineers reviewing the MSL2162DQ datasheet, MSL2162DQ pinout, MSL2162DQ application, or MSL2162DQ equivalent, key selection criteria include its dual-efficiency optimizer control of external DC-DC supplies, per-string open/short fault detection with hardware FLTB output, 64-pin TQFN package with exposed thermal pad, -40°C to +105°C operation, and support for up to eight daisy-chained devices on one SPI bus.

Technical Context

The MSL2162DQ implements a hybrid LED drive architecture: external N-channel MOSFETs handle high-current sinking per string (up to 350mA), while internal regulation monitors 500mV current-sense voltage across external resistors and synchronizes 12-bit PWM timing to video signals (PHI/VSYNC and GSC/HSYNC). Its two Efficiency Optimizer (EO) outputs dynamically adjust up to two external power supplies to minimum required voltage, reducing system power loss.

It features a dedicated 20 MHz SPI interface with chip-select daisy-chaining for up to eight devices, broadcast write capability, and on-chip EEPROM accessible via SPI to store startup register values. Fault management includes per-string open-circuit and short-circuit detection, loss-of-sync monitoring, over-temperature shutdown at 135°C, and active-low FLTB output assertion until fault registers are read.

Key Specifications

Pinout & Package

MSL2162DQ is housed in a thermally enhanced 64-lead TQFN package (9 mm × 9 mm × 0.85 mm, 0.5 mm lead pitch) with an exposed pad (EP) connected to power ground for thermal and electrical integrity. Bypass capacitors required: 10 µF on VIN, 4.7 µF on VCC and VDD.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSL2162DQ, TLC6983RTQR lacks video synchronization and efficiency optimization, limiting it to non-HDR lighting; ISL97693IRTZ-T7A omits EEPROM and hardware fault signaling, increasing MCU firmware burden and reducing system robustness in unattended operation.

Availability

MSL2162DQ is available at Aetrix Electronics and suitable for LCD TV backlighting, medical imaging displays, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and automotive-grade thermal performance.

Supply support for MSL2162DQ 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 technical and manufacturing continuity for legacy Atmel analog and LED driver products.

The MSL2162DQ belongs to Microchip's high-performance LED backlight controller family, designed specifically for adaptive local dimming in LCD TVs, medical monitors, and automotive displays demanding precision current regulation and video-synchronized PWM.

FAQ

What is the maximum number of MSL2162DQ devices that can be daisy-chained on a single SPI bus?

The MSL2162DQ supports up to eight devices per SPI chip-select line using daisy-chained CSB routing. Each device uses a unique ADDR pin configuration to assign individual slave IDs, enabling broadcast writes or targeted register access without additional GPIO lines. This scalability allows driving up to 128 LED strings (16 × 8) from one microcontroller SPI port in large-panel or multi-zone backlight systems.

How does the MSL2162DQ achieve ±1.5% current accuracy across all 16 LED strings?

The MSL2162DQ achieves ±1.5% current accuracy by regulating each string against a precision 500 mV reference applied to S0–S15 sense inputs, combined with matched internal current-sense amplifier offsets and gain. External current-sense resistors must be 1% tolerance or better, and layout symmetry (especially for Sx/Gx/Dx routing) is critical. The datasheet confirms this matching holds across -40°C to +105°C and full load range when design guidelines are followed.

Can the MSL2162DQ operate without external video timing signals like PHI and GSC?

Yes, the MSL2162DQ can operate standalone without PHI or GSC inputs. Its internal 20 MHz oscillator generates PWM timing, and the PWM input pin accepts an external 0–5 kHz signal for global brightness control. In this mode, phase spreading remains available to reduce input ripple, but advanced features like motion blur reduction and beat artifact elimination require PHI/GSC synchronization.

What fault conditions trigger the FLTB pin on the MSL2162DQ, and how is it cleared?

The FLTB pin on the MSL2162DQ asserts low for confirmed open-circuit, short-circuit, loss-of-video-sync (PHI/GSC timeout), or over-temperature (>135°C) faults. FLTB remains latched low until the corresponding fault status register is read via SPI. Persistent faults reassert FLTB after read; clearing requires both fault removal and register access. No hardware reset is needed-only SPI communication restores normal operation.

Does the MSL2162DQ support RGB LED strings, and how is color balance maintained?

Yes, the MSL2162DQ supports RGB LED strings via independent 12-bit PWM control per string and 8-bit global current scaling. Color balance is maintained through ±1.5% current matching across all strings and programmable per-string PWM duty cycles-enabling white point tuning, gamut expansion, and dynamic color correction. The device does not include integrated color sensor feedback; closed-loop color control requires external MCU coordination.