Texas Instruments TPS3780DDBVT

Overview

TPS3780DDBVT from Texas Instruments is a dual-channel, open-drain voltage detector IC designed for precision rail monitoring in low-power systems. It features 1% factory-set hysteresis, ±1% VIT+ threshold accuracy over –40°C to 125°C, and 2 µA typical quiescent current. The device monitors two independent supply rails (e.g., 3.3 V and 1.8 V) via external resistor dividers and asserts open-drain outputs to reset or enable inputs of microcontrollers and PMICs.

For engineers reviewing the TPS3780DDBVT datasheet, TPS3780DDBVT pinout, TPS3780DDBVT application, or TPS3780DDBVT equivalent, key selection criteria include its 1% hysteresis option, open-drain output compatibility with mixed-voltage logic domains, adjustable detection down to 1.2 V, and guaranteed operation across automotive-grade temperature range.

Technical Context

The TPS3780DDBVT implements two independent high-accuracy comparators with internal reference trimming, where SENSE1 and SENSE2 each drive dedicated open-drain outputs (OUT1/OUT2) based on rising/falling thresholds (VIT+/VIT–). Its 1% hysteresis (TPS3780D variant) ensures noise immunity without external components while maintaining precise undervoltage lockout behavior.

Each comparator input accepts 0–6.5 V regardless of VDD (1.5–6.5 V), enabling direct monitoring of higher-voltage rails. Output leakage is ≤250 nA at 125°C, and propagation delays are 5.5 µs (rising) and 10 µs (falling), supporting fast system response during power sequencing events.

Key Specifications

Pinout & Package

SOT-23-6 package (2.92 mm × 1.30 mm), thermally enhanced for compact PCB layouts in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3780DDBVT, TPS3780DBVR offers identical performance in reel format for manufacturing efficiency, while MAX6326TTUT+ sacrifices dual-channel capability and adjustability for marginally lower quiescent current in single-rail use cases.

Availability

TPS3780DDBVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, portable medical sensor monitoring, industrial PLC I/O module supervision, and set-top box power management requiring stable component supply across automotive and industrial temperature ranges.

Supply support for TPS3780DDBVT 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 power management and signal chain solutions.

The TPS37xx family was engineered specifically for high-accuracy, low-quiescent-current dual-rail supervision in battery-sensitive and thermally demanding applications - targeting portable electronics, automotive subsystems, and industrial control systems.

FAQ

What is the factory-set hysteresis value for TPS3780DDBVT?

The TPS3780DDBVT is the 'D' variant in the TPS3780 family and features a factory-trimmed 1% hysteresis. This value is laser-trimmed during production and specified in the Electrical Characteristics table as VIT+ = 1.182 V (nominal) with VIT– = 1.170 V at 3.3 V, yielding exactly 1% relative hysteresis. It remains stable across –40°C to +125°C per characterization data in Figure 3 and Figure 4 of the SBVS250 datasheet.

Can TPS3780DDBVT monitor a 5 V rail while powered from a 3.3 V supply?

Yes, TPS3780DDBVT can monitor a 5 V rail while operating from a 3.3 V VDD supply. Its SENSE1 and SENSE2 inputs accept voltages from 0 V to 6.5 V independent of VDD, enabling direct connection to higher-voltage rails via resistor dividers. The device's input bias current is only ±15 nA, minimizing divider error - confirmed in Section 7.5 "Electrical Characteristics" of the SBVS250 datasheet.

What pull-up resistor value is recommended for TPS3780DDBVT's open-drain outputs?

For TPS3780DDBVT, the recommended pull-up resistor value depends on the target logic-high voltage and sink current. With VOL ≤ 0.3 V at ISINK = 3.2 mA (VDD ≥ 4.5 V), a 10 kΩ resistor pulling to 3.3 V yields ~0.33 mA load and ensures robust logic-high definition. TI's datasheet specifies RPU range as 1.5 kΩ to 10 MΩ; 10 kΩ balances speed, power, and noise immunity for most applications.

Does TPS3780DDBVT support power-on reset (POR) functionality?

Yes, TPS3780DDBVT includes built-in power-on reset behavior. When VDD rises above V(POR) = 0.8 V, the device enters normal operation after a 570 µs startup delay (tSD). During VDD transients below V(POR), outputs are undefined - this is explicitly defined in Section 7.5 "Electrical Characteristics" and Section 8.4.2 "Power-On Reset" of the SBVS250 datasheet.

How does temperature affect the threshold accuracy of TPS3780DDBVT?

TPS3780DDBVT exhibits ±0.4% VIT+ deviation over –40°C to +125°C, as shown in Figure 3 of the SBVS250 datasheet. At 25°C, accuracy is ±1%; worst-case drift adds ±0.4% systematic error, resulting in total threshold variation of ±1.4% across temperature. This is verified by statistical binning data showing >99.5% of units within ±1% at 25°C and ±0.4% drift envelope.