Texas Instruments TPS92638QPWPRQ1

Overview

TPS92638QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade 8-channel linear LED driver with independent PWM dimming banks, ±3% per-channel current accuracy, 70 mA max per channel (560 mA in parallel), and integrated stop/tail current switching via dual reference inputs (REF/REFHI). It drives common-cathode LED strings in rear lighting systems requiring precise thermal foldback and fault reporting.

For engineers reviewing the TPS92638QPWPRQ1 datasheet, TPS92638QPWPRQ1 pinout, TPS92638QPWPRQ1 application, or TPS92638QPWPRQ1 equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive use cases, and two technically documented alternative parts for stop/tail LED driver selection.

Technical Context

The TPS92638QPWPRQ1 implements eight high-side constant-current regulators with programmable thermal foldback threshold (via TEMP pin), open- and short-LED detection with deglitch timing (7–8 PWM cycles), and four independent PWM input banks (PWM1–PWM4) each controlling two output channels. Its architecture supports common-cathode LED string topology to minimize wiring harness complexity.

Current regulation uses dual external reference resistors: REF sets tail-light current (e.g., 20 mA), while REFHI + REF jointly set stop-light current (e.g., 70 mA); both share the same 1.222 V internal reference voltage. Fault reporting occurs on an open-drain FAULT pin capable of bus-connection across up to 15 devices.

Key Specifications

Pinout & Package

TPS92638QPWPRQ1 uses a thermally enhanced 20-pin HTSSOP (PWP) package (6.50 mm × 4.40 mm) with exposed thermal pad for automotive under-hood thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-channel automotive LED driver applications.

Compared with TPS92638QPWPRQ1, TPS92633QPWPRQ1 reduces channel count and removes stop/tail differentiation, while AL8863T-7 trades integration and simplicity for higher efficiency and power capability - making TPS92638QPWPRQ1 optimal for compact, fault-aware rear lighting with dual-intensity demands.

Availability

TPS92638QPWPRQ1 is available at Aetrix Electronics and suitable for automotive rear lighting, daytime running light, and interior ambient lighting applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for TPS92638QPWPRQ1 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 ICs, with decades of experience in functional-safety-compliant power management solutions.

The TPS926xx-Q1 product line is engineered specifically for automotive exterior lighting, delivering integrated current regulation, fault diagnostics, and thermal resilience for stop/tail, DRL, and fog light modules.

FAQ

What is the maximum number of TPS92638QPWPRQ1 devices that can share a single FAULT bus?

The TPS92638QPWPRQ1 datasheet explicitly supports wired-OR connection of up to 15 devices on a shared FAULT bus. Each device's open-drain FAULT output pulls the line low upon detecting open-load, short-circuit, or thermal shutdown. This allows centralized fault monitoring without additional logic, and is validated for automotive lighting clusters requiring multi-driver coordination.

How does the TPS92638QPWPRQ1 implement dual-current operation for stop and tail lights?

The TPS92638QPWPRQ1 uses two reference inputs - REF for tail-current setting and REFHI for stop-current augmentation. When STOP = low, only REF sets current; when STOP = high, the sum of currents drawn from REF and REFHI determines output current. Both share the same 1.222 V internal reference, enabling precise ratio-based scaling (e.g., 3.5× stop-to-tail current) with matched resistors.

What is the purpose of the TEMP pin on the TPS92638QPWPRQ1, and how is it configured?

The TEMP pin on the TPS92638QPWPRQ1 programs the thermal foldback activation threshold (95–125°C) using an external resistor to ground. As junction temperature rises, the device linearly reduces output current to avoid thermal shutdown. Connecting TEMP directly to GND disables foldback entirely. The pin also provides a factory-programmable analog voltage output proportional to junction temperature (25 mV/°C).

Does the TPS92638QPWPRQ1 support common-anode or common-cathode LED configurations?

The TPS92638QPWPRQ1 is a high-side current source, requiring common-cathode LED string configuration. All eight IOUTx pins drive current into the LED anodes, while cathodes connect to a shared ground plane. This eliminates individual return paths per string, reducing wiring harness weight and PCB layer count - a key advantage in automotive rear lamp design.

What are the absolute maximum ratings for the SUPPLY pin of the TPS92638QPWPRQ1?

The SUPPLY pin of the TPS92638QPWPRQ1 has an absolute maximum rating of 45 V for durations up to 200 ms, per the datasheet's Absolute Maximum Ratings table. Continuous operation is limited to 5–40 V. This 45 V transient tolerance accommodates automotive jump-start events and load-dump surges, ensuring robustness in real-world vehicle electrical environments.