Texas Instruments TPS92620QDGNRQ1

Overview

TPS92620QDGNRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive two-channel high-side linear LED driver with external thermal sharing capability, delivering up to 250mA per channel with ±5% current accuracy over –40°C to +125°C ambient, 4.5V–40V input range, and 600mV max dropout at 250mA - used in rear lamps and CHMSL systems requiring fault-tolerant, thermally managed LED control.

For engineers reviewing the TPS92620QDGNRQ1 datasheet, TPS92620QDGNRQ1 pinout, TPS92620QDGNRQ1 application, or TPS92620QDGNRQ1 equivalent, this page delivers verified package mapping (HVSSOP-12), validated thermal sharing architecture, confirmed one-fails–all-fail fault bus operation, and real-world diagnostic thresholds for LED open/short detection and thermal shutdown.

Technical Context

The TPS92620QDGNRQ1 implements dual independent high-side current regulation using external sense resistors (R_SNS1/R_SNS2) with fixed 150mV regulation voltage, enabling precise per-channel current setting. Its thermal sharing architecture routes part of each channel's output current through dedicated RESx pins via external shunt resistors, dynamically redistributing power dissipation away from the die.

It integrates AEC-Q100-compliant diagnostics including auto-recovering LED open-circuit detection (180–420mV rising threshold), short-to-GND protection (0.855–1.26V thresholds), and thermal shutdown at 157–187°C with 15°C hysteresis. The FAULT pin supports configurable N-1 or one-fails–all-fail bus topology when tied with other TPS926xx-Q1 devices.

Key Specifications

Pinout & Package

HVSSOP-12 (DGN) package with PowerPAD™ thermal pad (3.00mm × 4.00mm body); exposed thermal pad must be soldered to PCB ground plane for optimal thermal performance and reliability in automotive under-hood environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side LED driver applications.

Compared with TPS92620QDGNRQ1, TPS92621QDGNRQ1 offers identical performance with configurable fault bus behavior, while TPS92620QDRRQ1 provides identical functionality in a smaller WSON package but lacks EN-controlled shutdown - making the DGN variant optimal for battery-sensitive, enable-gated automotive lighting nodes.

Availability

TPS92620QDGNRQ1 is available at Aetrix Electronics and suitable for automotive rear lighting, CHMSL systems, and door handle illumination requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for TPS92620QDGNRQ1 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade power management and lighting solutions.

The TPS92620-Q1 belongs to TI's automotive LED driver product line, engineered specifically for thermally constrained exterior lighting applications requiring AEC-Q100 qualification, fault resilience, and precise current regulation across wide voltage and temperature ranges.

FAQ

What is the maximum continuous output current per channel for the TPS92620QDGNRQ1?

The TPS92620QDGNRQ1 delivers up to 250mA per channel continuously under recommended operating conditions (–40°C to +125°C ambient, 4.5V–40V supply). This rating assumes proper thermal management - including use of the RESx thermal sharing path and adequate PCB copper area connected to the PowerPAD™ - to maintain junction temperature below 150°C. Current accuracy remains ±5% across the full temperature range.

How does the thermal sharing feature work in the TPS92620QDGNRQ1?

The TPS92620QDGNRQ1 routes each channel's output current across two parallel paths: OUTx (direct to LED anode) and RESx (through external shunt resistor). An internal regulation loop dynamically allocates current between them based on voltage headroom - maximizing RESx current when dropout is large to offload power dissipation. This reduces die temperature rise, enabling higher sustained output in thermally isolated housings like sealed rear lamps.

Does the TPS92620QDGNRQ1 support one-fails–all-fail fault bus operation?

Yes, the TPS92620QDGNRQ1 supports one-fails–all-fail fault bus operation via its open-drain FAULT pin. When multiple TPS92620QDGNRQ1 devices (or compatible TPS9261x/TPS9263x-Q1 drivers) have their FAULT pins tied together with a single pull-up resistor, any channel fault pulls the entire bus low - triggering system-level response. This behavior is enabled by default and configurable via external biasing per application requirements.

What is the purpose of the DIAGEN pin on the TPS92620QDGNRQ1?

The DIAGEN pin on the TPS92620QDGNRQ1 disables LED open-circuit detection during low-dropout operation to prevent false triggers. When V_IN–V_OUT falls below ~180mV, the sense amplifier may misinterpret normal regulation as an open string. Holding DIAGEN low during such conditions suppresses this diagnostic, allowing uninterrupted operation near dropout - critical for tail lamp dimming at low battery voltage.

Can the TPS92620QDGNRQ1 be used without an external microcontroller for basic on/off control?

Yes, the TPS92620QDGNRQ1 supports standalone operation using supply-voltage control or direct EN/PWM signaling. Its built-in power-on reset (POR) and fault recovery eliminate need for MCU supervision in simple applications. For example, connecting EN to battery via a resistor divider allows automatic wake/sleep based on ignition state, while PWM inputs accept standard 200Hz–1kHz signals for brightness control without firmware overhead.