Texas Instruments TPS3779BDRYR

Overview

TPS3779BDRYR from Texas Instruments is a dual-channel, low-power, high-accuracy voltage detector IC with push-pull outputs, 5% factory-set hysteresis, and operation over 1.5 V to 6.5 V supply range. It monitors two independent voltage rails via SENSE1/SENSE2 inputs, asserts OUT1/OUT2 low on undervoltage detection, and delivers ±1% VIT+ threshold accuracy across –40°C to 125°C - used in microcontroller reset supervision and power-rail sequencing for portable medical devices.

For engineers reviewing the TPS3779BDRYR datasheet, TPS3779BDRYR pinout, TPS3779BDRYR application, or TPS3779BDRYR equivalent, key selection criteria include its 5% hysteresis option, µSON-6 package footprint, 2 µA typical quiescent current, and push-pull output compatibility with 1.5–6.5 V VDD logic levels - critical for battery-powered system monitoring where false triggering must be avoided under rail noise.

Technical Context

The TPS3779BDRYR implements two independent precision comparators with internal reference trimming, each featuring fixed 5% hysteresis (VHYS = 5% × VIT+) and separate rising/falling thresholds (VIT+, VIT–). Its push-pull outputs drive high to VDD and low to GND without external pull-ups, eliminating interface level constraints when VDD matches system logic voltage.

Threshold deviation remains within ±0.4% over –40°C to +120°C, verified per temperature sweep data; input bias current is ±15 nA, enabling high-impedance resistor-divider configurations down to 1.2 V detection. Startup delay is fixed at 570 µs after VDD crosses VDD(min), ensuring deterministic power-on behavior.

Key Specifications

Pinout & Package

TPS3779BDRYR uses a 1.45 mm × 1.00 mm, 6-pin µSON (DRY) package with wettable flanks for automated optical inspection. Thermal resistance RθJA is 306.7°C/W, requiring minimal copper pour for thermal management in low-power applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3779BDRYR, TPS3779CDRYR trades faster release for stronger noise rejection, while TPS3780BDBVR sacrifices board space efficiency for voltage-level flexibility - making TPS3779BDRYR optimal for compact, single-rail, noise-moderate embedded systems.

Availability

TPS3779BDRYR is available at Aetrix Electronics and suitable for microcontroller reset supervision, power-rail sequencing, and portable medical monitoring requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3779BDRYR 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 designed specifically for ultra-low-power, high-accuracy voltage monitoring in space- and energy-constrained applications - targeting portable electronics, industrial sensors, and automotive subsystems demanding reliable reset functionality.

FAQ

What is the factory-set hysteresis value for TPS3779BDRYR?

The TPS3779BDRYR has a factory-set hysteresis of 5%, meaning the difference between its rising threshold (VIT+) and falling threshold (VIT–) is exactly 5% of VIT+. This value is laser-trimmed during production and cannot be adjusted externally. For example, with a nominal VIT+ of 1.194 V, VIT– is 1.134 V. This fixed hysteresis eliminates design uncertainty and ensures consistent noise immunity across all units of TPS3779BDRYR without requiring external components.

Can TPS3779BDRYR monitor voltages below 1.5 V?

No, TPS3779BDRYR cannot reliably monitor voltages below 1.2 V at the SENSE pins, but its minimum operating VDD is 1.5 V. The SENSE inputs accept 0 V to 6.5 V regardless of VDD, so a 1.2 V rail can be monitored using an external resistor divider referenced to a higher VDD (e.g., 3.3 V), scaling the rail into the detectable range. However, the device itself requires ≥1.5 V on VDD to function - attempting to power TPS3779BDRYR from a sub-1.5 V source will result in undefined outputs and potential latch-up.

Does TPS3779BDRYR require external pull-up resistors on its outputs?

No, TPS3779BDRYR does not require external pull-up resistors because it features push-pull outputs. OUT1 and OUT2 actively drive high to VDD and low to GND, eliminating the need for external components. This reduces BOM cost and PCB area versus open-drain alternatives like the TPS3780 series. However, ensure that the driven logic (e.g., MCU reset pin) accepts VDD-referenced voltage levels - mismatched logic families may require level translation.

How does temperature affect the threshold accuracy of TPS3779BDRYR?

TPS3779BDRYR maintains VIT+ deviation within ±0.4% over –40°C to +120°C, as confirmed by characterization data showing linear drift of ±0.0033%/°C. At +125°C, total error remains within ±1% including initial trim tolerance. This stability is achieved via on-chip curvature-corrected bandgap reference and matched comparator design. No external compensation is needed - the full ±1% accuracy spec holds across the entire –40°C to +125°C operating range specified in the datasheet for TPS3779BDRYR.

What is the startup behavior of TPS3779BDRYR during power-on?

Upon power-on, TPS3779BDRYR enters a 570 µs startup delay (tSD) after VDD crosses VDD(min) (~1.5 V). During this period, outputs remain in their prior state (high-impedance is not supported - they hold last valid state). After tSD expires, OUT1 and OUT2 begin responding to SENSE1/SENSE2 in real time. If VDD drops below V(POR) (0.8 V), outputs become undefined until VDD recovers and tSD reinitiates. This behavior ensures deterministic reset assertion timing in systems with slow-rising supplies.