Texas Instruments TPS92611QDGNRQ1

Overview

TPS92611QDGNRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified automotive single-channel high-side linear LED driver with PWM dimming, ±4.6% current regulation accuracy, 300 mA max output, and integrated open-circuit/short-to-ground diagnostics. It operates from 4.5 V to 40 V and delivers stable current for dome lights, rear lamps, and charging inlet indicators.

For engineers reviewing the TPS92611QDGNRQ1 datasheet, TPS92611QDGNRQ1 pinout, TPS92611QDGNRQ1 application, or TPS92611QDGNRQ1 equivalent, key selection considerations include diagnostic enable (DIAGEN) threshold configuration, fault-bus scalability up to 15 devices, low-dropout operation down to 120 mV at 10 mA, and thermal shutdown at 172°C with 15°C hysteresis.

Technical Context

The TPS92611QDGNRQ1 implements a high-side constant-current architecture using an external R(SNS) resistor to set output current via 98 mV nominal sense voltage regulation. Its diagnostics rely on dual-threshold comparators monitoring V(IN)–V(OUT) for open-circuit faults and V(OUT) for short-to-ground faults, each with configurable deglitch timers (80–175 µs).

It supports two fault-bus configurations: one-fails–all-fail (FAULT externally pulled up ≤ I(FAULT_pulldown)) or per-channel-only shutdown (FAULT externally pulled up > I(FAULT_pulldown)). The DIAGEN pin enables/disables open-circuit detection based on supply-sensed voltage, preventing false alarms during low-dropout operation.

Key Specifications

Pinout & Package

TPS92611QDGNRQ1 is housed in an MSOP-8 package (3 mm × 3 mm) with exposed thermal pad for enhanced power dissipation in automotive environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS92612QDGNRQ1, TPS92611QDGNRQ1 eliminates unused analog monitor circuitry for lower cost and reduced board space; compared with TPS92630QPWPRQ1, it provides higher per-channel thermal performance in smaller footprint but requires separate ICs per string.

Availability

TPS92611QDGNRQ1 is available at Aetrix Electronics and suitable for automotive interior lighting, exterior signaling, and EV charging interface applications requiring stable component supply, AEC-Q100 compliance, and functional safety documentation support.

Supply support for TPS92611QDGNRQ1 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 company specializing in analog and embedded processing technologies, with deep expertise in automotive-grade power management and signal chain solutions.

The TPS9261x-Q1 product line was designed specifically for automotive LED lighting systems requiring robust diagnostics, wide input range, and functional safety readiness - targeting dome, rear, and indicator lamps.

FAQ

What is the maximum continuous output current supported by the TPS92611QDGNRQ1?

The TPS92611QDGNRQ1 supports a maximum continuous output current of 300 mA. This rating is valid across its full operating ambient temperature range of –40°C to 125°C and supply voltage range of 4.5 V to 40 V. Current is set externally via R(SNS) using the formula I(OUT) = V(CS_REG)/R(SNS), where V(CS_REG) is nominally 98 mV. Derating may be required depending on PCB thermal design and ambient conditions.

How does the DIAGEN pin function in the TPS92611QDGNRQ1?

The DIAGEN pin in the TPS92611QDGNRQ1 enables or disables LED open-circuit detection based on an externally applied voltage. When V(DIAGEN) exceeds 1.2 V (VIH), open-circuit diagnostics are active; when below 1.1 V (VIL), they are disabled. This prevents false fault reporting during low-dropout operation when supply voltage approaches LED forward voltage. A resistor divider from SUPPLY to GND typically sets this threshold.

Can the TPS92611QDGNRQ1 operate in fault mode without disrupting other devices on the same fault bus?

Yes - the TPS92611QDGNRQ1 supports configurable fault-bus behavior. If the FAULT line is externally pulled up with current exceeding 750 µA (I(FAULT_pulldown) max), the one-fails–all-fail function is disabled. In that case, only the faulty TPS92611QDGNRQ1 channel shuts down while others remain operational. This configuration requires careful external pullup sizing and is documented in Section 7.3.6 of the datasheet.

What thermal metrics apply to the TPS92611QDGNRQ1 in its MSOP-8 PowerPAD package?

The TPS92611QDGNRQ1 in the DGN (MSOP-8 with exposed thermal pad) package has RθJA = 60°C/W, RθJC(bot) = 11.3°C/W, and RθJB = 25.6°C/W. These values assume standard JEDEC 2-layer board conditions. The exposed thermal pad must be soldered to a copper pour for effective heat transfer; omitting thermal vias or pad connection degrades performance significantly and risks thermal shutdown under sustained 300 mA load.

Does the TPS92611QDGNRQ1 support both PWM input dimming and supply-based dimming?

Yes - the TPS92611QDGNRQ1 supports two dimming methods. PWM input dimming uses the dedicated PWM pin to gate output current directly. Supply dimming applies PWM to the SUPPLY pin, but requires a resistor divider on the PWM pin to set a threshold above the POR rising level (≥4 V) for reliable operation. Both methods achieve precise duty-cycle control, with typical rising/falling delays of 17 µs and 21 µs respectively.