Texas Instruments TPS3702AX18DDCT

Overview

TPS3702AX18DDCT from Texas Instruments is a high-accuracy window voltage detector IC designed for precision overvoltage and undervoltage monitoring of low-voltage rails (1V–5V nominal). It features ±0.25% typical threshold accuracy, 0.55% internal hysteresis, open-drain UV/OV outputs, and operates across 2V–18V supply with 7µA quiescent current. It is used in FPGA power sequencing, DSP supply supervision, and industrial control safety circuits.

For engineers reviewing the TPS3702AX18DDCT datasheet, TPS3702AX18DDCT pinout, TPS3702AX18DDCT application, or TPS3702AX18DDCT equivalent, key selection considerations include its dual open-drain output architecture, SET-pin configurable accuracy bands (±4% or ±9% nominal), –40°C to 125°C industrial temperature range, SOT-6 package footprint, and internal resistor-divider elimination of external component error sources.

Technical Context

The TPS3702AX18DDCT integrates two precision comparators and a trimmed internal resistor divider to form a window detector without external resistors. Its VIT+(OV) and VIT–(UV) thresholds are factory-set for nominal rails between 1V and 5V, with worst-case accuracy of ±0.9% over –40°C to 125°C.

It uses independent open-drain outputs (UV and OV) that can be wired-OR'd externally, supports pull-up voltages up to 18V regardless of VDD, and includes internal glitch immunity and 300µs startup delay (tSD) to prevent false resets during power-on transients.

Key Specifications

Pinout & Package

SOT-6 (DDC) package, 2.90mm × 1.60mm body size, surface-mount, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar window voltage detector applications.

Compared with TPS3702AX18DDCT, the TPS3702CX18DDCT offers identical performance but removes SET-pin configurability-reducing design flexibility at no cost or size benefit. The MAX6816EUT+T provides ultra-low IQ but lacks window detection entirely, requiring additional components to replicate basic TPS3702AX18DDCT functionality.

Availability

TPS3702AX18DDCT is available at Aetrix Electronics and suitable for FPGA power sequencing, industrial control systems, and motor drive safety monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS3702AX18DDCT 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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-precision analog ICs and industrial-grade reliability.

The TPS3702 family is designed for high-accuracy power supply monitoring in safety-critical and thermally demanding applications-including factory automation, motor control, and programmable logic systems-where narrow voltage margins and long-term stability are essential.

FAQ

What is the function of the SET pin on the TPS3702AX18DDCT?

The SET pin on the TPS3702AX18DDCT selects between two nominal accuracy bands: ≤250mV configures ±9%, and ≥750mV configures ±4%. This allows dynamic adjustment of the detection window during system startup or operational modes. The TPS3702AX18DDCT uses this pin to avoid false resets during power-rail settling while tightening tolerance post-startup - a capability not present in fixed-threshold alternatives.

Does the TPS3702AX18DDCT require external resistors to set voltage thresholds?

No, the TPS3702AX18DDCT does not require external resistors. It integrates a precision trimmed resistor divider and reference, enabling fixed window thresholds optimized for 1V–5V nominal rails. This eliminates resistor tolerance errors, reduces PCB area, and improves long-term accuracy - a key differentiator versus discrete comparator solutions. All threshold calibration is performed at wafer test for the TPS3702AX18DDCT.

What is the maximum voltage the SENSE pin can monitor on the TPS3702AX18DDCT?

The SENSE pin of the TPS3702AX18DDCT accepts up to 6.5V (with absolute maximum rating of 7.0V), independent of VDD voltage. This allows direct monitoring of common logic rails (1.2V, 1.8V, 3.3V, 5V) without attenuation. For rails above 6.5V, an external resistor divider is required - but must account for SENSE input current (≤1.5µA) to preserve accuracy. The TPS3702AX18DDCT's internal architecture ensures this specification holds across its full –40°C to 125°C operating range.

Can the UV and OV outputs of the TPS3702AX18DDCT be tied together?

Yes, the UV and OV outputs of the TPS3702AX18DDCT can be tied together using wired-OR logic because both are active-low open-drain outputs. When either condition occurs (SENSE < VIT– or SENSE > VIT+), the combined node pulls low. This simplifies reset generation in systems requiring a single fault indicator. Pull-up voltage may be up to 18V and need not match VDD - a feature confirmed in the TPS3702AX18DDCT datasheet Section 6.3.2 and Figure 7-5.

What is the startup behavior of the TPS3702AX18DDCT after power application?

After VDD rises above 2V, the TPS3702AX18DDCT requires a 300µs startup delay (tSD) before outputs become valid. During this time, outputs are undefined. If VDD remains between V(POR) = 0.8V and UVLO = 1.3–1.7V, UV is asserted low and OV is high-impedance - a defined undervoltage lockout state. Full window detection begins only after tSD expires and VDD exceeds UVLO. This staged initialization is explicitly specified for the TPS3702AX18DDCT in Section 6.4.1–6.4.3.