Texas Instruments TPS389050LQDSERQ1

Overview

TPS389050LQDSERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade voltage supervisor IC that monitors a 5.0 V supply rail with a fixed negative threshold of 4.40 V and positive threshold of 4.425 V, delivers 1% max threshold accuracy over –40°C to +125°C, features user-programmable reset delay (25 µs to 30 s via external CT capacitor), and asserts an open-drain RESET signal for microcontroller power-on-reset and brownout protection in infotainment head units and ADAS camera modules.

For engineers reviewing the TPS389050LQDSERQ1 datasheet, TPS389050LQDSERQ1 pinout, TPS389050LQDSERQ1 application, or TPS389050LQDSERQ1 equivalent, key selection criteria include its 4.40 V trip point for 5 V rail monitoring, 2.1 µA typical quiescent current, WSON-6 package footprint, and MR input support for system-initiated resets - all validated across automotive temperature and ESD stress conditions.

Technical Context

The TPS389050LQDSERQ1 implements a precision bandgap reference and comparator-based supervision architecture with built-in hysteresis (0.325–0.825%) to prevent chatter during rail recovery. Its CT pin uses a 1.15 µA internal charging current and 1.23 V comparator threshold to set reset delay time via external capacitor, enabling precise timing control independent of supply voltage.

It operates across 1.5 V to 5.5 V VDD, supports SENSE inputs up to 5.5 V regardless of VDD, and integrates glitch immunity (≥9 µs at 5% overdrive) on both SENSE and MR pins. The open-drain RESET output tolerates pull-up voltages up to 5.5 V and sinks up to 20 mA, supporting interoperability with diverse logic families.

Key Specifications

Pinout & Package

TPS389050LQDSERQ1 is housed in a thermally enhanced 6-pin WSON package (1.5 mm × 1.5 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 is SENSE; pin 2 is GND; pin 3 is MR; pin 4 is VDD; pin 5 is CT; pin 6 is RESET. The package supports reflow soldering per JEDEC J-STD-020 and achieves R_θJA = 321.3°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS389050GQDSERQ1 and TPS389050QDSERQ1, the TPS389050LQDSERQ1 provides the lowest trip threshold in the 5 V family - making it uniquely suitable for applications where early detection of marginal 5 V rail degradation is essential, such as in thermally stressed ADAS camera modules.

Availability

TPS389050LQDSERQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera, and digital cluster applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for TPS389050LQDSERQ1 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 delivering analog and embedded processing solutions, with leadership in automotive electronics, power management, and precision analog.

The TPS3890-Q1 product line was designed specifically for automotive voltage supervision - emphasizing ultra-low quiescent current, AEC-Q100 qualification, and programmable timing to meet stringent functional safety and reliability requirements in modern vehicle ECUs.

FAQ

What is the exact negative threshold voltage (VITN) of the TPS389050LQDSERQ1?

The TPS389050LQDSERQ1 has a factory-set negative threshold voltage (VITN) of 4.40 V, with ±1% maximum accuracy across –40°C to +125°C junction temperature. This value is specified in the Device Comparison Table of the official SBVS303B datasheet and verified in electrical characteristics testing under recommended operating conditions.

Does the TPS389050LQDSERQ1 support manual reset functionality?

Yes, the TPS389050LQDSERQ1 includes a dedicated MR (manual reset) input (Pin 3). Driving MR low asserts the open-drain RESET output regardless of SENSE voltage. After MR returns high and SENSE exceeds VITP (4.425 V), RESET remains asserted for the programmed delay time before deasserting.

What is the minimum and maximum reset delay time achievable with the TPS389050LQDSERQ1?

The TPS389050LQDSERQ1 supports a reset delay range of 25 µs (CT pin left unconnected) to 30 s (CT pin connected to 26 µF capacitor). The delay is calculated as t_PD(r) = C_CT × 1.07 + 25 µs (nominal), using the device's 1.15 µA CT charging current and 1.23 V comparator threshold.

Can the TPS389050LQDSERQ1 monitor supply voltages other than 5 V?

No - the TPS389050LQDSERQ1 is a fixed-threshold variant optimized for 5.0 V rail supervision (VITN = 4.40 V). For monitoring other rails (e.g., 1.2 V, 1.8 V, 3.3 V), TI offers pin-compatible variants like TPS389012-Q1 or TPS389033-Q1. The adjustable TPS389001-Q1 supports custom thresholds down to 1.15 V via external resistor divider.

What package type and dimensions does the TPS389050LQDSERQ1 use?

The TPS389050LQDSERQ1 is packaged in a 6-pin WSON (DSE) package measuring 1.5 mm × 1.5 mm with 0.5 mm pitch and an exposed thermal pad. It complies with JEDEC MO-229 and supports standard reflow profiles per J-STD-020, enabling high-density automotive PCB layouts.