Texas Instruments TPS3779BQDBVRQ1

Overview

TPS3779BQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified dual-channel voltage detector IC for automotive power-rail monitoring, featuring 5% hysteresis, ±1% threshold accuracy over –40°C to +125°C, 2 µA typical quiescent current, and push-pull outputs. It monitors two independent supply rails (e.g., 3.3 V and 5 V) via adjustable SENSE1/SENSE2 inputs and drives reset/enable signals for microcontrollers or DC-DC regulators.

For engineers reviewing the TPS3779BQDBVRQ1 datasheet, TPS3779BQDBVRQ1 pinout, TPS3779BQDBVRQ1 application, or TPS3779BQDBVRQ1 equivalent, key selection criteria include its automotive-grade temperature range, dual independent detection channels with factory-set 5% hysteresis, low-power operation, and SOT-23-6 push-pull output compatibility with 1.5–5.5 V VDD.

Technical Context

The TPS3779BQDBVRQ1 implements two independent high-accuracy comparators with internal reference trimming, each configured with fixed 5% hysteresis between VIT+ (1.194 V nominal) and VIT– (1.134 V nominal). Its push-pull outputs drive logic-high to VDD and logic-low to GND without external pullups, enabling direct interface with CMOS reset inputs.

Operation is validated across –40°C to +125°C ambient, with VDD supply range 1.5 V to 5.5 V and SENSEx input range 0 V to 5.5 V - independent of VDD. Startup delay is 570 µs after VDD crosses VDD(min), and propagation delays are 5.5 µs (rising) and 10 µs (falling) under typical conditions.

Key Specifications

Pinout & Package

SOT-23-6 package (2.90 mm × 1.60 mm), surface-mount, thermally optimized for automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3779CQDBVRQ1 and TPS3780BQDBVRQ1, the TPS3779BQDBVRQ1 offers optimal balance of noise rejection and simplicity for standard 3.3 V/5 V automotive rail supervision - delivering deterministic reset timing without external components or voltage translation overhead.

Availability

TPS3779BQDBVRQ1 is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and digital cluster applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for TPS3779BQDBVRQ1 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 and embedded processing technologies, with deep expertise in automotive-grade power management and system monitoring solutions.

The TPS37xx-Q1 product line delivers high-accuracy, low-power voltage supervision ICs designed specifically for automotive safety-critical subsystems requiring robust rail monitoring and deterministic reset behavior.

FAQ

What is the maximum input voltage allowed on the SENSE1 and SENSE2 pins of the TPS3779BQDBVRQ1?

The SENSE1 and SENSE2 pins of the TPS3779BQDBVRQ1 accept input voltages from 0 V to 5.5 V, independent of the VDD supply voltage. This allows monitoring of higher-voltage rails (e.g., 5 V) even when VDD is powered from a lower voltage such as 3.3 V or 1.8 V, eliminating the need for external level-shifting circuitry in mixed-voltage automotive systems.

Does the TPS3779BQDBVRQ1 require external pullup resistors on its outputs?

No, the TPS3779BQDBVRQ1 features push-pull outputs (OUT1 and OUT2), which actively drive both high (to VDD) and low (to GND). Unlike open-drain variants, it does not require external pullup resistors - reducing BOM count, PCB area, and potential failure points in automotive applications where reliability is critical.

How does the 5% hysteresis of the TPS3779BQDBVRQ1 improve system reliability?

The 5% hysteresis in the TPS3779BQDBVRQ1 creates a voltage window between VIT+ (1.194 V) and VIT– (1.134 V), preventing rapid output toggling during supply rail noise or slow decay events. This ensures clean, chatter-free reset assertion in electrically noisy automotive environments - such as near motors or switching regulators - where undervoltage detection must be both precise and stable.

Can the TPS3779BQDBVRQ1 monitor two different voltage rails simultaneously?

Yes, the TPS3779BQDBVRQ1 has two fully independent voltage detection channels: SENSE1/OUT1 and SENSE2/OUT2. Each channel uses its own resistor divider to set custom thresholds, enabling concurrent monitoring of disparate rails - for example, a 3.3 V MCU supply and a 5 V peripheral bus - with separate reset outputs for fault isolation and sequencing control.

What is the startup behavior of the TPS3779BQDBVRQ1 during power-up?

Upon power-up, the TPS3779BQDBVRQ1 enters a 570 µs startup delay after VDD crosses VDD(min). During this period, outputs remain in a known inactive state. Only after the delay completes does the device begin sampling SENSE1 and SENSE2 and asserting OUT1/OUT2 based on actual input conditions - ensuring reliable reset generation without spurious pulses during cold-cranking or battery-recovery scenarios.