Texas Instruments TPS92620QDRRRQ1

Overview

TPS92620QDRRRQ1 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.

For engineers reviewing the TPS92620QDRRRQ1 datasheet, TPS92620QDRRRQ1 pinout, TPS92620QDRRRQ1 application, or TPS92620QDRRRQ1 equivalent, key selection criteria include thermal-sharing resistor support, dual independent PWM dimming control, one-fails-all-fail fault bus configuration, and WSON-12 package compatibility with PowerPAD™ for automotive lighting BOMs requiring functional safety diagnostics.

Technical Context

The TPS92620QDRRRQ1 implements dual independent high-side current regulation using external R_SNSx sense resistors to maintain 150mV regulation voltage (V_{CS_REG}), enabling precise 5–250mA per channel output. It supports two parallel current paths per channel - OUTx and RESx - dynamically allocating current between them based on supply-to-LED forward voltage headroom to limit junction temperature rise.

Its diagnostic architecture includes LED open-circuit detection (180–420mV threshold), short-to-GND detection (0.855–1.26V threshold), auto-recovery fault handling, and configurable fault bus operation (N-1 or one-fails-all-fail). Thermal shutdown triggers at 157–187°C with 15°C hysteresis, and it operates across –40°C to +150°C junction temperature.

Key Specifications

Pinout & Package

TPS92620QDRRRQ1 uses a 12-pin WSON package (3.0mm × 3.0mm) with exposed thermal pad (DAP) for enhanced thermal dissipation. Pin numbering follows top-view orientation with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS92620QDRRRQ1, the HVSSOP variant adds EN control and slightly better thermal resistance but increases footprint; the TPS92612QPWPRQ1 reduces channel count and eliminates thermal sharing, limiting its use to simpler, lower-power lighting zones.

Availability

TPS92620QDRRRQ1 is available at Aetrix Electronics and suitable for automotive rear lighting, CHMSL systems, and interior ambient lighting requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for TPS92620QDRRRQ1 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, embedded processing, and automotive-grade power management solutions with decades of automotive qualification expertise.

The TPS926xx-Q1 product line delivers AEC-Q100-compliant LED drivers optimized for automotive exterior lighting, featuring integrated diagnostics, thermal sharing, and fault-bus interoperability for functional safety architectures.

FAQ

What is the maximum ambient temperature rating for the TPS92620QDRRRQ1?

The TPS92620QDRRRQ1 is qualified to AEC-Q100 Temperature Grade 1, supporting continuous operation from –40°C to +125°C ambient temperature. Its junction temperature range extends to +150°C, and thermal shutdown activates between 157°C and 187°C to protect against sustained overload conditions. This makes the TPS92620QDRRRQ1 suitable for under-hood and exterior lighting locations subject to extreme thermal cycling.

Does the TPS92620QDRRRQ1 require an enable (EN) pin to operate?

No, the TPS92620QDRRRQ1 in the DRR (WSON-12) package does not have an EN pin. It powers up automatically when SUPPLY exceeds the 4.0V POR rising threshold and shuts down when SUPPLY falls below 3.4V. In contrast, the HVSSOP variant (TPS92620QDGNRQ1) includes an EN pin for explicit sleep-mode control. The TPS92620QDRRRQ1 relies solely on supply voltage sequencing for ON/OFF control.

How does thermal sharing work on the TPS92620QDRRRQ1?

The TPS92620QDRRRQ1 splits each channel's total current between OUTx and RESx pins using internal regulation to maintain constant sum current. When supply-to-LED voltage headroom is large, >95% of current flows through RESx into an external shunt resistor, moving power dissipation off-die. As headroom shrinks, current shifts toward OUTx. This dynamic allocation keeps junction temperature within safe limits without requiring external thermal sensors or feedback loops - a core feature of the TPS92620QDRRRQ1.

Can the TPS92620QDRRRQ1 drive LEDs in a one-fails-all-fail configuration?

Yes, the TPS92620QDRRRQ1 supports one-fails-all-fail operation via its open-drain FAULT pin. When multiple TPS92620QDRRRQ1 devices (or compatible TPS9261x-Q1/TPS9263x-Q1 drivers) tie their FAULT pins together with a shared pullup, any single device asserting FAULT pulls the entire bus low - disabling all connected drivers. This behavior meets stringent safety requirements for brake lamps and is configurable in hardware without firmware involvement, a key capability of the TPS92620QDRRRQ1.

What is the recommended PWM frequency for brightness control with the TPS92620QDRRRQ1?

Texas Instruments recommends 200Hz PWM input for brightness control with the TPS92620QDRRRQ1, using 1%–100% duty cycle. This frequency avoids visible flicker while ensuring stable current regulation and minimal timing jitter (<5µs delay). The TPS92620QDRRRQ1 maintains accurate dimming linearity across this range, and its internal circuitry rejects sub-100Hz modulation that could cause perceptible strobing - a validated performance characteristic of the TPS92620QDRRRQ1.