Texas Instruments TPS3780CQDBVRQ1

Overview

TPS3780CQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified dual-channel open-drain voltage detector for automotive power-rail monitoring. It features 10% factory-set hysteresis, ±1% VIT+ accuracy over –40°C to +125°C, 2 µA typical quiescent current, and independent SENSE1/SENSE2 inputs configurable down to 1.2 V via external resistor dividers - used in ADAS domain controllers to monitor core and I/O supply rails.

For engineers reviewing the TPS3780CQDBVRQ1 datasheet, TPS3780CQDBVRQ1 pinout, TPS3780CQDBVRQ1 application, or TPS3780CQDBVRQ1 equivalent, key selection criteria include open-drain output compatibility with mixed-voltage reset logic, temperature-stable threshold deviation (±0.4% max), dual-channel independence for fault-isolation sequencing, and SOT-23-6 package suitability for space-constrained automotive PCBs.

Technical Context

The TPS3780CQDBVRQ1 implements two independent high-accuracy comparators with internal reference trimming, each driving an open-drain output (OUT1/OUT2) that sinks up to 5 mA and supports pull-up voltages up to 5.5 V - independent of VDD (1.5 V–5.5 V). Its 10% hysteresis is factory-fixed and non-adjustable, eliminating external hysteresis components while ensuring noise immunity on noisy automotive rails.

Each SENSE input accepts 0–5.5 V regardless of VDD level, enabling direct monitoring of higher-voltage rails (e.g., 5 V or 3.3 V) while powered from a lower-voltage domain (e.g., 1.8 V). Threshold accuracy is maintained across temperature via laser-trimmed references, with VIT+ deviation bounded within ±0.4% from –40°C to +125°C.

Key Specifications

Pinout & Package

SOT-23-6 package (2.90 mm × 1.60 mm), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel voltage detector applications.

Compared with TPS3780BQDBVRQ1 and MAX6326TTUT+T, the TPS3780CQDBVRQ1 delivers superior noise immunity for harsh automotive environments via its wider 10% hysteresis, while its dual open-drain outputs reduce component count and enable mixed-voltage reset coordination unattainable with single-channel alternatives.

Availability

TPS3780CQDBVRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, infotainment head-units, and electric power steering modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3780CQDBVRQ1 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 ICs, with decades of experience in high-reliability power management and system monitoring solutions.

The TPS37xx-Q1 product line was designed specifically for automotive voltage supervision - delivering AEC-Q100 qualified, low-quiescent-current, dual-channel detectors with factory-trimmed accuracy and hysteresis to simplify safety-critical power-rail monitoring.

FAQ

What is the maximum allowable voltage on the SENSE1 and SENSE2 pins of the TPS3780CQDBVRQ1?

The SENSE1 and SENSE2 pins of the TPS3780CQDBVRQ1 accept input voltages from 0 V to 5.5 V, independent of the VDD supply voltage. This allows direct monitoring of higher-voltage rails (e.g., 5 V or 3.3 V) even when VDD is powered from a lower domain (e.g., 1.8 V), making the TPS3780CQDBVRQ1 suitable for mixed-voltage automotive systems without level-shifting circuitry.

Does the TPS3780CQDBVRQ1 require external pull-up resistors on its outputs?

Yes, the TPS3780CQDBVRQ1 features open-drain outputs (OUT1 and OUT2), so external pull-up resistors are mandatory for proper logic-high assertion. The pull-up voltage can be up to 5.5 V - independent of VDD - enabling interface with diverse reset/enable inputs. Recommended RPU values range from 1.5 kΩ to 10 kΩ depending on sink current and rise-time requirements.

How does the 10% hysteresis of the TPS3780CQDBVRQ1 improve system reliability in automotive applications?

The 10% hysteresis in the TPS3780CQDBVRQ1 prevents false triggering caused by supply ripple, switching noise, or transient dips - common in automotive environments. By widening the gap between rising (VIT+) and falling (VIT–) thresholds, it ensures stable output states during marginal rail conditions, eliminating chatter that could cause unintended resets or erratic MCU behavior in safety-critical systems.

Can the TPS3780CQDBVRQ1 monitor two different voltage rails simultaneously?

Yes, the TPS3780CQDBVRQ1 integrates two fully independent voltage detection channels (SENSE1/OUT1 and SENSE2/OUT2), each configurable via separate resistor dividers. This enables simultaneous monitoring of disparate rails - such as a 1.2 V SoC core supply and a 5 V USB-C PD input - with independent reset assertions, supporting complex power sequencing and fault-isolation strategies in modern automotive ECUs.

What is the startup delay specification for the TPS3780CQDBVRQ1, and how does it affect system initialization?

The TPS3780CQDBVRQ1 has a guaranteed startup delay (tSD) of 570 µs after VDD crosses VDD(min). During this period, outputs remain undefined until internal circuitry stabilizes. This delay ensures reliable power-on reset generation only after VDD reaches a valid operating level, preventing premature release of reset signals that could corrupt boot sequences in automotive microcontrollers and SoCs.