Texas Instruments TPS3780BQDBVRQ1

Overview

TPS3780BQDBVRQ1 from Texas Instruments is an automotive-grade dual-channel open-drain voltage detector IC used for precise power-rail monitoring in safety-critical systems. It features 5% hysteresis, ±1% threshold accuracy over –40°C to +125°C, 2 µA typical quiescent current, and supports adjustable detection down to 1.2 V via external resistor dividers on SENSE1/SENSE2 inputs. It is deployed in ADAS domain controllers to monitor core and I/O supply rails.

For engineers reviewing the TPS3780BQDBVRQ1 datasheet, TPS3780BQDBVRQ1 pinout, TPS3780BQDBVRQ1 application, or TPS3780BQDBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, open-drain output compatibility with mixed-voltage logic interfaces (up to 5.5 V pull-up), dual independent threshold channels with temperature-stable VIT+ deviation ≤±0.4%, and SOT-23-6 package suitability for space-constrained automotive PCBs.

Technical Context

The TPS3780BQDBVRQ1 implements two independent high-accuracy comparators with factory-trimmed 5% hysteresis (VHYS = 5% × VIT+), enabling robust rejection of rail noise without external components. Its SENSE1/SENSE2 inputs operate from 0 V to 5.5 V independent of VDD (1.5 V–5.5 V), supporting monitoring of higher-voltage rails using resistor dividers.

Each channel asserts its open-drain output (OUT1/OUT2) low when the respective sense input falls below VIT– (e.g., 1.134 V at nominal VIT+ = 1.194 V), and deasserts (high-impedance) when rising above VIT+. Propagation delays are 5.5 µs (rising) and 10 µs (falling), with a 570 µs startup delay after VDD crosses VDD(min).

Key Specifications

Pinout & Package

SOT-23-6 package (2.90 mm × 1.60 mm), thermally optimized for automotive PCBs with RθJA = 193.9°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3780CQDBVRQ1 and TPS3779BQDBVRQ1, the TPS3780BQDBVRQ1 uniquely balances noise immunity (5% hysteresis), interface flexibility (5.5 V-tolerant open-drain outputs), and minimal external component count - making it optimal for multi-rail automotive ECUs requiring both precision and interoperability.

Availability

TPS3780BQDBVRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, infotainment system power sequencing, and cluster microcontroller supervision requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3780BQDBVRQ1 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 leadership in automotive electronics and functional safety solutions.

The TPS37xx-Q1 product line delivers high-accuracy, low-power voltage supervision ICs designed specifically for AEC-Q100-compliant automotive systems requiring reliable power-rail monitoring and reset generation under harsh thermal and electrical conditions.

FAQ

What is the maximum allowable voltage on the SENSE1 and SENSE2 pins of the TPS3780BQDBVRQ1?

The SENSE1 and SENSE2 pins of the TPS3780BQDBVRQ1 support input voltages from 0 V to 5.5 V, independent of the VDD supply voltage (1.5 V–5.5 V). This allows direct monitoring of higher-voltage rails-such as 5 V or 3.3 V domains-using external resistor dividers without risk of damage or specification violation, as confirmed in the Absolute Maximum Ratings table.

Does the TPS3780BQDBVRQ1 require external pull-up resistors on its outputs?

Yes, the TPS3780BQDBVRQ1 uses open-drain outputs (OUT1 and OUT2), so external pull-up resistors are mandatory for proper logic-level assertion. The datasheet specifies a recommended RPU range of 1.5 kΩ to 10 MΩ, with value selection dependent on sink current, VOL, and leakage (Ilkg(OD) ≤ ±250 nA). Pull-up voltage may be up to 5.5 V, independent of VDD.

How does the 5% hysteresis of the TPS3780BQDBVRQ1 affect its reset behavior?

The 5% hysteresis in the TPS3780BQDBVRQ1 means the falling threshold (VIT–) is 5% below the rising threshold (VIT+ = 1.194 V), resulting in VIT– = 1.134 V. This gap prevents output oscillation during slow or noisy rail recoveries, ensuring a clean, single reset pulse even if the monitored voltage lingers near the trip point-critical for deterministic system boot behavior.

Can the TPS3780BQDBVRQ1 monitor two different voltage rails simultaneously?

Yes, the TPS3780BQDBVRQ1 is explicitly designed for dual-rail monitoring: SENSE1 and SENSE2 accept independent input voltages (0–5.5 V), each driving its own open-drain output (OUT1/OUT2). This enables concurrent supervision of, for example, a 1.2 V core rail and a 3.3 V interface rail-with separate reset signals routed to distinct subsystems in automotive ECUs.

What is the startup delay of the TPS3780BQDBVRQ1 after power-on?

The TPS3780BQDBVRQ1 exhibits a 570 µs startup delay (tSD) after VDD crosses VDD(min). During this period, outputs remain undefined until internal circuitry stabilizes. This delay ensures reliable operation following cold-cranking events or battery transients, and is specified across the full –40°C to +125°C temperature range per the Electrical Characteristics table.