Texas Instruments TPS3702AX18DDCR

Overview

TPS3702AX18DDCR from Texas Instruments is a high-accuracy window voltage detector IC designed for monitoring low-voltage supply rails (1V–5V nominal) in safety-critical power management systems. It delivers ±0.25% typical threshold accuracy, 0.55% internal hysteresis, 7µA typical quiescent current, and operates across –40°C to 125°C. It is used in FPGA/ASIC power sequencing to assert independent open-drain UV and OV reset signals when monitored voltage exits the precision window.

For engineers reviewing the TPS3702AX18DDCR datasheet, TPS3702AX18DDCR pinout, TPS3702AX18DDCR application, or TPS3702AX18DDCR equivalent, key selection considerations include its dual open-drain outputs, SET-pin configurable accuracy bands (±4% or ±9% nominal), SENSE input tolerance up to 6.5V independent of VDD, glitch-immune timing (35µs max LH propagation delay), and qualification for industrial temperature operation.

Technical Context

The TPS3702AX18DDCR integrates two matched comparators with a precision reference and trimmed internal resistor divider - eliminating external resistors and their tolerance impact on threshold accuracy. Its architecture supports independent undervoltage (UV) and overvoltage (OV) detection with programmable hysteresis (0.55% or 1.0%) and user-selectable accuracy bands via the SET pin.

It features separate SENSE and VDD pins enabling rail redundancy, internal undervoltage lockout (UVLO at 1.3–1.7V), and open-drain outputs capable of sinking 10mA while being pulled up to 18V - decoupling output logic levels from supply voltage constraints.

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 TPS3702CX18DDCR, the TPS3702AX18DDCR offers runtime accuracy band selection - enabling adaptive supervision during boot vs. operation. Versus MAX6816EUT+T, it provides full window detection, wider VDD/SENSE ranges, and industrial temperature rating - making it suitable for safety-critical embedded systems where both UV and OV faults must be independently flagged.

Availability

TPS3702AX18DDCR is available at Aetrix Electronics and suitable for FPGA power sequencing, DSP-based motor control, and industrial PLC power integrity requiring stable component supply, long-lifecycle assurance, and guaranteed traceability.

Supply support for TPS3702AX18DDCR 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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.

The TPS3702 family is designed for precision power-supply monitoring in industrial, automotive, and communications infrastructure - delivering high-accuracy window detection without external components to simplify design and improve system robustness.

FAQ

What is the function of the SET pin on the TPS3702AX18DDCR?

The SET pin on the TPS3702AX18DDCR selects between two nominal accuracy bands: ≤250mV configures ±9%, and ≥750mV configures ±4%. This allows dynamic adjustment of detection sensitivity - for example, using the wider band during system startup to avoid nuisance resets, then tightening to ±4% during normal operation. The TPS3702AX18DDCR leverages this feature to reduce qualification overhead across multiple rail tolerances without changing hardware.

Can the TPS3702AX18DDCR monitor a 12V supply rail?

Yes - the SENSE pin accepts up to 6.5V directly, so a 12V rail requires an external resistor divider. The TPS3702AX18DDCR's low SENSE input current (≤1.5µA) ensures minimal loading error; TI recommends divider current ≥150× ISENSE (i.e., >225µA) for <0.1% accuracy impact. The TPS3702AX18DDCR maintains its ±0.9% threshold accuracy over temperature even with properly designed dividers.

How does the TPS3702AX18DDCR handle power supply ramp-up?

The TPS3702AX18DDCR incorporates a 300µs startup delay (tSD) and undervoltage lockout (UVLO) at 1.3–1.7V. When VDD rises above UVLO, outputs remain undefined until tSD elapses - ensuring stable internal reference and comparator operation before asserting UV/OV. During this phase, the TPS3702AX18DDCR prevents false resets, making it suitable for controlled power sequencing in complex SoC systems.

Are the UV and OV outputs of the TPS3702AX18DDCR truly independent?

Yes - the TPS3702AX18DDCR provides electrically isolated open-drain UV and OV outputs, each with dedicated internal comparators and thresholds. They can be pulled up to different voltages (e.g., UV to 3.3V for MCU reset, OV to 12V for relay driver), driven simultaneously, or wired-OR'd into a single fault line. This independence is confirmed in the truth table and functional block diagram of the TPS3702AX18DDCR datasheet.

What is the maximum sink current capability of the TPS3702AX18DDCR outputs?

The UV and OV outputs of the TPS3702AX18DDCR each support up to 10mA sink current at VOL ≤250mV (tested per Electrical Characteristics table). This allows direct interfacing with standard logic inputs, optocouplers, or small-signal MOSFET gates without external buffers. The TPS3702AX18DDCR maintains this drive strength across its full operating temperature range (–40°C to 125°C) and VDD range (2V–18V).