Texas Instruments TPS3850G30DRCT

Overview

TPS3850G30DRCT from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for high-reliability power-rail monitoring in microcontroller and SoC systems. 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 and WDO outputs, and enables tight-tolerance fault detection on rails from 0.9 V to 5.0 V - critical for ultrasound scanner and mMIMO baseband power sequencing.

For engineers reviewing the TPS3850G30DRCT datasheet, TPS3850G30DRCT pinout, TPS3850G30DRCT application, or TPS3850G30DRCT equivalent, key selection criteria include its ±4%/±7% factory-selectable fault windows, user-programmable reset delay (703 µs–3.22 s), window watchdog timing configurability via CWD/SET pins, and 10-lead VSON package compatibility with space-constrained industrial and medical PCB layouts.

Technical Context

The TPS3850G30DRCT implements dual independent timing paths: one for precision reset delay (tRST) controlled by CRST pin configuration (capacitor or 10-kΩ pullup), and another for window watchdog boundaries (tWDL/tWDU) set by CWD capacitor value and SET0/SET1 logic states. Its internal reference achieves 0.8% overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) threshold accuracy across full temperature range, with 0.5% hysteresis ensuring immunity to rail noise and glitches.

It operates as a dual-function supervisory circuit: the SENSE pin monitors external supply rails with ±4% or ±7% fault windows, while the WDI input requires periodic falling-edge transitions within dynamically configurable time windows - enabling detection of both early and late faults in real-time control loops such as robot servo drives and infusion pump controllers.

Key Specifications

Pinout & Package

TPS3850G30DRCT is housed in a thermally enhanced 3.00 mm × 3.00 mm, 10-pin VSON (DRC) package with exposed thermal pad internally connected to GND. The package supports reflow soldering per JEDEC J-STD-020 and offers R_θJA = 52.3°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3850G30DRCT, TPS3851G33DRCT offers identical timing and accuracy but sacrifices SENSE flexibility, while MAX6373KA29+T reduces complexity at the expense of watchdog functionality and precision - making TPS3850G30DRCT optimal for safety-critical, multi-rail, and firmware-recovery-aware systems.

Availability

TPS3850G30DRCT is available at Aetrix Electronics and suitable for ultrasound scanner power sequencing, mMIMO base station reliability, robot servo drive control, and infusion pump safety monitoring requiring stable component supply across extended temperature and long product lifecycles.

Supply support for TPS3850G30DRCT 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 high-reliability power management and system supervision ICs.

The TPS3850 family was engineered for mission-critical applications demanding simultaneous precision voltage monitoring and intelligent watchdog functionality - targeting medical imaging, 5G infrastructure, industrial robotics, and safety-certified portable devices.

FAQ

What is the operating temperature range for the TPS3850G30DRCT?

The TPS3850G30DRCT is rated for junction temperatures from –40°C to +125°C, with guaranteed 0.8% voltage threshold accuracy across this full range. Its thermal design - including the exposed thermal pad in the VSON-10 package - supports reliable operation in sealed enclosures and high-ambient environments such as base station radios and motor drive cabinets. This makes the TPS3850G30DRCT suitable for industrial and automotive under-hood applications where ambient temperatures exceed 85°C.

How does the TPS3850G30DRCT implement window watchdog functionality?

The TPS3850G30DRCT implements window watchdog functionality through two independently configurable time boundaries: tWDL (lower) and tWDU (upper). A falling edge on WDI must occur strictly between these boundaries to prevent WDO assertion. These boundaries are set by CWD capacitor value and SET0/SET1 logic states - e.g., SET0=0/SET1=1 yields a 3:4 ratio, while SET0=1/SET1=1 gives 1:2. This architecture detects both early (stuck WDI) and late (missed pulse) faults, unlike standard timeout watchdogs. The TPS3850G30DRCT's dedicated WDO output remains high-impedance when RESET is low, ensuring clean system-level fault isolation.

Can the TPS3850G30DRCT monitor multiple voltage rails simultaneously?

No, the TPS3850G30DRCT monitors only one voltage rail via its single SENSE pin. However, it supports rails from 0.9 V to 5.0 V - covering common core (1.2 V), I/O (1.8 V, 3.3 V), and analog (5 V) supplies - and allows selection of ±4% or ±7% fault windows to match each rail's tolerance. For multi-rail systems, multiple TPS3850G30DRCT devices are used in parallel, each assigned to a specific rail. Its small 3-mm × 3-mm VSON package and low 10-µA quiescent current make this scalable without significant board area or power penalty.

What are the reset delay configuration options for the TPS3850G30DRCT?

The TPS3850G30DRCT offers two reset delay configuration methods: factory-programmed options (e.g., 10 ms or 200 ms) selected via CRST pin states (NC or 10-kΩ pullup to VDD), and user-programmable delays using an external capacitor from CRST to GND (0.1 nF–1000 nF yields 703 µs–3.22 s). The device evaluates CRST configuration each time SENSE re-enters its valid window, enabling dynamic reconfiguration. All options maintain 9.5% timing accuracy, eliminating need for calibration or trimming in production test.

Does the TPS3850G30DRCT support watchdog disable during firmware development?

Yes, the TPS3850G30DRCT supports hardware-based watchdog disable via logic levels on SET0 and SET1 pins: setting SET0 = 1 and SET1 = 0 disables the watchdog timer entirely, causing WDO to remain high-impedance regardless of WDI activity. This allows safe debugging and firmware bring-up without spurious timeouts. When disabled, WDI must still be driven (to VDD or GND) - it cannot float. This feature is documented in Section 6.6 of the datasheet and verified across all temperature and voltage conditions.