Texas Instruments TPS3780DDBVR

Overview

TPS3780DDBVR 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 TPS3780DDBVR datasheet, TPS3780DDBVR pinout, TPS3780DDBVR application, or TPS3780DDBVR 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 operation across 1.5–6.5 V supply range with guaranteed performance at automotive temperature extremes.

Technical Context

The TPS3780DDBVR implements two independent high-accuracy comparators with internal reference trimming-VIT+ = 1.182 V (±1%) and VIT– = VIT+ × (1 − 0.01) - enabling precise undervoltage detection with built-in noise immunity. Its open-drain outputs support pull-up to 6.5 V independent of VDD, allowing interface with higher-voltage logic or wired-AND configurations.

Each SENSE input accepts 0–6.5 V regardless of VDD level, and the device includes 570 µs startup delay after VDD crosses VDD(min), ensuring stable assertion only after power stabilization. Propagation delays are 5.5 µs (rising) and 10 µs (falling), optimized for fast response to rail collapse without false triggering from transient glitches.

Key Specifications

Pinout & Package

SOT23-6 package (2.92 mm × 1.30 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 TPS3780CDBVR and MAX6816EUT+T, the TPS3780DDBVR delivers superior threshold precision (±1% vs. ±2.5% or ±5%), lower power (2 µA vs. 10 µA), and true dual-rail independence - making it optimal for space-constrained, multi-supply systems requiring deterministic reset behavior.

Availability

TPS3780DDBVR is available at Aetrix Electronics and suitable for DSP/microcontroller reset, portable medical device monitoring, and automotive body control unit designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3780DDBVR 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 conditioning ICs.

The TPS37xx family was engineered specifically for high-accuracy, low-power voltage supervision in battery-operated and thermally demanding applications - delivering factory-trimmed thresholds, configurable hysteresis, and robust operation from –40°C to 125°C.

FAQ

What is the exact VIT+ threshold voltage of the TPS3780DDBVR?

The TPS3780DDBVR has a factory-trimmed positive-going input threshold (VIT+) of 1.182 V with ±1% accuracy over –40°C to 125°C. This value is fixed for the 'D' variant and applies to both SENSE1 and SENSE2 inputs. The corresponding VIT– threshold is 1.170 V (1.182 V × 0.99), establishing the 1% hysteresis window. Measured values fall within this band under all recommended operating conditions.

Can the TPS3780DDBVR monitor voltages higher than its VDD supply?

Yes, the TPS3780DDBVR SENSE1 and SENSE2 inputs accept voltages from 0 V to 6.5 V regardless of VDD level - enabling direct monitoring of 5 V or 3.3 V rails even when powered from a 1.8 V supply. This is achieved through internal level-shifting circuitry. However, VDD must remain within 1.5–6.5 V, and the monitored voltage must not exceed the absolute maximum rating of 7 V on any pin.

Does the TPS3780DDBVR require external pull-up resistors on its outputs?

Yes, the TPS3780DDBVR features open-drain outputs (OUT1 and OUT2), so external pull-up resistors are mandatory for proper logic-level assertion. Pull-up voltage may be up to 6.5 V - independent of VDD - supporting mixed-voltage interfaces. Recommended RPU values range from 1.5 kΩ to 10 kΩ depending on sink current and rise-time requirements, as specified in the Electrical Characteristics table.

How does the 1% hysteresis of the TPS3780DDBVR improve system reliability?

The 1% hysteresis in the TPS3780DDBVR creates a 11.82 mV voltage window between VIT+ (1.182 V) and VIT– (1.170 V), preventing output oscillation during slow-moving or noisy supply transitions. This eliminates false resets caused by ripple, load transients, or thermal drift - especially critical in low-noise digital systems like FPGA configuration circuits or precision ADC references where stability margins are tight.

What is the startup behavior of the TPS3780DDBVR during power-on?

Upon power application, the TPS3780DDBVR enters a 570 µs startup delay period after VDD crosses VDD(min). During this time, outputs remain in high-impedance state and do not respond to SENSE inputs. After the delay, outputs begin tracking SENSE states normally. This ensures reliable reset assertion only after internal circuitry stabilizes - preventing spurious resets during VDD ramp-up or brownout recovery sequences.