Texas Instruments TPS3850G50DRCR

Overview

TPS3850G50DRCR from Texas Instruments is a precision voltage supervisor with integrated programmable window watchdog timer, designed for high-reliability microcontroller and SoC power-rail monitoring. It delivers 0.8% threshold accuracy over –40°C to +125°C, supports 1.6 V–6.5 V supply range, features open-drain RESET/WDO outputs, and enables ±4% or ±7% fault windows on rails from 0.9 V to 5.0 V - critical for ultrasound scanner and active antenna system power integrity.

For engineers reviewing the TPS3850G50DRCR datasheet, TPS3850G50DRCR pinout, TPS3850G50DRCR application, or TPS3850G50DRCR equivalent, key selection considerations include factory-programmed vs. capacitor-programmable reset/watchdog timing, SENSE pin glitch immunity (≤40 ps), 10 µA typical supply current, and VSON-10 thermal-pad package compatibility with high-density PCB layouts.

Technical Context

The TPS3850G50DRCR implements dual independent timing paths: one for RESET delay (programmable via CRST pin using capacitor or 10-kΩ pullup) and another for window watchdog boundaries (programmable via CWD pin and SET0/SET1 logic inputs). Its precision window comparator uses trimmed internal references and achieves 0.5% hysteresis on both overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds.

Watchdog operation requires valid WDI edge transitions within dynamically configurable tWDL/tWDU windows - with ratios of 1/8, 3/4, or 1/2 selectable by SET0/SET1 states. The device disables watchdog functionality when SET0 = SET1 = 1 and CWD = NC or pulled up, enabling safe development mode without hardware modification.

Key Specifications

Pinout & Package

VSON-10 (DRC) package: 3.00 mm × 3.00 mm body with exposed thermal pad connected internally to GND. Requires solder paste stencil design for thermal pad reflow and PCB copper pour for optimal heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and watchdog timer applications.

Compared with TPS3851G50DRCR, the TPS3850G50DRCR omits the load switch to reduce solution size and cost while retaining identical supervision accuracy and watchdog configurability; compared with MAX6373KA29+T, it delivers tighter threshold tolerance, wider temperature range, and true window watchdog capability essential for real-time embedded safety.

Availability

TPS3850G50DRCR is available at Aetrix Electronics and suitable for ultrasound scanner, active antenna system (AAS), and robot servo drive applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3850G50DRCR 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 precision analog ICs and industrial-grade power management solutions.

The TPS3850G50DRCR belongs to TI's high-accuracy voltage supervisor product line, engineered specifically for mission-critical power-rail monitoring in medical imaging, 5G infrastructure, and industrial automation systems demanding sub-1% threshold stability.

FAQ

What is the operating temperature range for the TPS3850G50DRCR?

The TPS3850G50DRCR operates over a junction temperature range of –40°C to +125°C, validated per its absolute maximum ratings and recommended operating conditions. This range is confirmed in Section 6.3 of the datasheet and supports deployment in automotive under-hood, industrial motor drive, and outdoor telecom equipment where ambient extremes are common. The TPS3850G50DRCR maintains 0.8% voltage threshold accuracy across this full range.

How does the TPS3850G50DRCR implement window watchdog functionality?

The TPS3850G50DRCR implements window watchdog functionality through dedicated timing circuits that monitor WDI edge transitions against two independently programmable boundaries: tWDL (lower) and tWDU (upper). These boundaries are set via CWD pin configuration (capacitor or resistor) and SET0/SET1 logic states, enabling ratios of 1/8, 3/4, or 1/2. A valid watchdog event requires a falling edge on WDI occurring strictly between tWDL and tWDU - ensuring detection of both stuck and excessively fast software execution. The TPS3850G50DRCR asserts WDO only when RESET is high, preventing conflict during power-up sequences.

Can the TPS3850G50DRCR monitor multiple voltage rails simultaneously?

The TPS3850G50DRCR has a single SENSE input pin and is designed to monitor one voltage rail at a time. However, multiple TPS3850G50DRCR devices can be used in parallel to supervise different rails - for example, one for a 1.8-V core and another for a 3.3-V I/O rail - with coordinated RESET signaling via external OR-ing or microcontroller GPIO polling. The TPS3850G50DRCR does not support multiplexed or switched SENSE inputs; each instance monitors exactly one rail with dedicated over/undervoltage thresholds.

What are the reset delay options available on the TPS3850G50DRCR?

TPS3850G50DRCR offers two reset delay implementation methods: factory-programmed default values (170–230 ms, 9.5% accuracy) selected by leaving CRST unconnected or pulling it up with a 10-kΩ resistor to VDD, and user-programmable delays (703 µs to 3.22 s) achieved by connecting an external capacitor (0.1–1000 nF) between CRST and GND. Equation 3 in the datasheet defines the relationship between capacitance and delay. The TPS3850G50DRCR evaluates CRST configuration at every SENSE window entry, enabling dynamic reconfiguration during system operation.

Is the TPS3850G50DRCR pin-compatible with other members of the TPS385x family?

Yes, the TPS3850G50DRCR shares identical VSON-10 (DRC) package pinout and footprint with all TPS385x variants including TPS3851G50DRCR and TPS3850H01DRCR. Pin functions (VDD, SENSE, RESET, WDO, CWD, CRST, SET0, SET1, WDI, GND) are electrically and physically identical across the family. This allows direct substitution for functional evaluation or design reuse - though users must verify that the specific threshold version (e.g., G50 = 5.0-V nominal SENSE threshold) and feature set (e.g., load switch in TPS3851) match system requirements before replacement.