Texas Instruments TPS3780BDRYR

Overview

TPS3780BDRYR from Texas Instruments is a dual-channel, open-drain voltage detector IC designed for precision rail monitoring in low-power systems. It features 5% hysteresis, ±1% VIT+ threshold accuracy over –40°C to 125°C, 2 µA typical quiescent current, and operates from 1.5 V to 6.5 V supply. It is used in power-supply sequencing and reset supervision for microcontrollers and SSDs.

For engineers reviewing the TPS3780BDRYR datasheet, TPS3780BDRYR pinout, TPS3780BDRYR application, or TPS3780BDRYR equivalent, key selection considerations include its open-drain output architecture (supporting independent pull-up to 6.5 V), factory-set 5% hysteresis, dual independent SENSE inputs with adjustable thresholds via external resistor dividers, and µSON-6 package compatibility with space-constrained portable and industrial designs.

Technical Context

The TPS3780BDRYR implements two independent high-accuracy comparators, each with internal reference trimming for VIT+ (rising threshold) and VIT– (falling threshold), where VIT– = VIT+ × (1 − hysteresis). Its 5% hysteresis option ensures robust immunity to rail noise without external components. The device asserts OUT1/OUT2 low when respective SENSE input falls below VIT–, and deasserts high when rising above VIT+.

It supports wide input voltage ranges: SENSE pins accept 0–6.5 V regardless of VDD (1.5–6.5 V), enabling monitoring of rails higher than the detector's supply. Startup delay is fixed at 570 µs after VDD crosses VDD(min), and propagation delays are 5.5 µs (rising) and 10 µs (falling), ensuring deterministic timing in reset-critical applications.

Key Specifications

Pinout & Package

TPS3780BDRYR is housed in a 1.45 mm × 1.00 mm, 6-pin µSON (DRY) package with wettable flanks, optimized for automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3780BDRYR, TPS3780CDRYR offers greater noise margin but reduced threshold resolution, while TPS3779BDBVR eliminates pull-up components but sacrifices voltage-level flexibility-making TPS3780BDRYR optimal for mixed-rail, space-sensitive, and battery-powered designs requiring precise, configurable supervision.

Availability

TPS3780BDRYR is available at Aetrix Electronics and suitable for power-supply sequencing, microcontroller reset supervision, and solid-state drive (SSD) power monitoring requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS3780BDRYR 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 decades of expertise in precision sensing, power management, and industrial-grade IC design.

The TPS37xx family-including TPS3780BDRYR-is engineered for high-accuracy, low-power voltage monitoring in safety-critical and battery-operated systems, emphasizing factory-trimmed thresholds, wide temperature operation, and minimal external component count.

FAQ

What is the hysteresis setting for TPS3780BDRYR?

The TPS3780BDRYR has a factory-set hysteresis of 5%, meaning VIT– = VIT+ × 0.95. This value is laser-trimmed during manufacturing and cannot be adjusted externally. It provides optimal noise rejection for mid-noise environments such as industrial power supplies and portable computing rails, balancing responsiveness and stability without requiring additional components.

Can TPS3780BDRYR monitor a 5 V rail while powered from a 3.3 V supply?

Yes. TPS3780BDRYR supports SENSE inputs up to 6.5 V independent of VDD, so it can monitor a 5 V rail while operating from a 3.3 V VDD supply. Its open-drain outputs also allow pull-up to 5 V, enabling direct interface to 5 V logic inputs-no level shifter is needed. This capability is explicitly specified in the Electrical Characteristics table under "Sense voltage" and "Output voltage (TPS3780 only)".

What is the minimum recommended pull-up resistor for OUT1/OUT2 on TPS3780BDRYR?

The minimum recommended pull-up resistor for TPS3780BDRYR outputs is 1.5 kΩ when sinking 5 mA at VOL ≤ 0.3 V (per datasheet Section 7.5). For typical 3.3 V pull-up with 1 mA sink, a 10 kΩ resistor is commonly used. The maximum allowed is 10 MΩ per Recommended Operating Conditions, but values >100 kΩ increase susceptibility to noise and slow rise time-designers should verify timing margins using tPD(r) and load capacitance.

Does TPS3780BDRYR require an input capacitor on the SENSE pins?

No, TPS3780BDRYR does not require input capacitors on SENSE1 or SENSE2. Its built-in comparator hysteresis and high input impedance (±15 nA bias current) make external filtering unnecessary in most applications. However, for extremely noisy environments (e.g., motor drive feedback paths), a 1–10 nF ceramic capacitor placed directly at the SENSE pin may improve immunity-this is noted as optional good practice in Section 8.3.1 of the datasheet.

How does the 570 µs startup delay affect system reset behavior in TPS3780BDRYR?

The 570 µs startup delay in TPS3780BDRYR ensures that OUT1 and OUT2 remain undefined until VDD stabilizes above VDD(min), preventing premature or glitchy reset release during power-up transients. After this delay, outputs respond immediately to SENSE voltage transitions. This fixed delay is critical for synchronizing reset assertion with power rail settling-especially in multi-rail systems where VDD may ramp slower than monitored rails.