TPS92761-Q1 24-Channel LED Matrix Manager

Introduction

Texas Instruments’ TPS92761-Q1 is an automotive-qualified 24-channel LED matrix manager designed for lighting systems requiring individually controlled, constant-current LED channels. It combines 24 protected linear current sinks with an integrated synchronous buck regulator, reducing the need to assemble these functions from separate devices.

The device is technically notable for pairing per-channel 6-bit current adjustment and 14-bit PWM dimming with UART communication, EEPROM, ADC monitoring, dynamic headroom control, and fault diagnostics. Its AEC-Q100 Grade 1 qualification and specified −40°C to +125°C ambient operating range position it for demanding automotive electronic environments.

What it does

The TPS92761-Q1 controls up to 24 LED channels through precision constant-current sinks. Each channel can be programmed independently with 6-bit current settings and 14-bit PWM dimming, enabling channel-level brightness and current control in an LED matrix.

Channel current is specified up to 90 mA, while the current sinks support up to 20 V. Channel-to-channel current accuracy is specified at less than ±3.5%. At a 90 mA load, the typical current-sink dropout voltage is 400 mV.

An integrated synchronous buck regulator supplies the LED system. It accepts a 5 V to 36 V input and supports switching at either 400 kHz or 2.1 MHz. The stated output-current capability is 4 A at 400 kHz or 2.68 A at 2.1 MHz.

UART serial communication operates with clock frequencies up to 2 MHz. Internal EEPROM, multiplexed ADC monitoring, dynamic headroom control, and diagnostic functions provide configuration, monitoring, and fault-reporting capabilities within the LED-management device.

Applications

• Automotive LED matrix lighting systems
• Multi-channel vehicle exterior-lighting modules
• LED assemblies requiring independent current and PWM control per channel
• Automotive lighting electronics that combine regulated LED power conversion and current-sink control
• Lighting controllers requiring serial configuration, monitoring, and diagnostics

Design considerations

The TPS92761-Q1 integrates both switching power regulation and linear current-sink channels, so system design needs to account for the buck regulator’s 5 V to 36 V input range, selected switching frequency, and associated output-current capability.

Its 24 channels use independent 6-bit current settings and 14-bit PWM dimming, which can support detailed matrix-control schemes but also requires appropriate channel configuration through the UART interface. The UART clock is specified up to 2 MHz.

For LED voltage planning, the sinks have a maximum 20 V voltage capability and a typical 400 mV dropout at 90 mA. The device’s ADC monitoring, dynamic headroom control, EEPROM, and diagnostics are relevant where channel monitoring and retained configuration are required. For functional-safety-oriented designs, TI provides documentation intended to aid ISO 26262 system design up to ASIL B.

Availability and further information

The source/distributor link on this page provides further product information from Mouser Electronics. The linked TI datasheet provides detailed electrical characteristics, configuration information, diagnostic behavior, and implementation guidance for the TPS92761-Q1.