Texas Instruments TPS3850H50DRCR

Overview

TPS3850H50DRCR from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for high-reliability power-rail monitoring in microcontroller-based 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 precise overvoltage/undervoltage detection on the SENSE pin for rails from 0.9 V to 5.0 V - used in ultrasound scanners and active antenna systems.

For engineers reviewing the TPS3850H50DRCR datasheet, TPS3850H50DRCR pinout, TPS3850H50DRCR application, or TPS3850H50DRCR equivalent, key selection considerations include its ±4%/±7% fault window options, factory-programmed or capacitor-programmable reset/watchdog timing, 10-µA typical supply current, 0.5% hysteresis, and 3-mm × 3-mm VSON-10 package compatibility with tight-layout industrial and medical electronics.

Technical Context

The TPS3850H50DRCR implements a dual-threshold window comparator on the SENSE pin with independent, temperature-stable overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) trip points, each achieving 0.8% accuracy across –40°C to +125°C. Its internal precision clock and state machine drive both the RESET delay circuit and the window watchdog timer, enabling deterministic timing behavior without external crystal.

Watchdog operation uses a configurable window ratio (1:8, 3:4, or 1:2) selected via SET0/SET1 logic inputs, with upper/lower boundaries programmable either by external capacitor on CWD or factory settings. The CRST pin similarly configures RESET delay using capacitor, pullup resistor, or NC - all evaluated within 381 µs after SENSE re-enters valid window.

Key Specifications

Pinout & Package

TPS3850H50DRCR is housed in a thermally enhanced 3.00-mm × 3.00-mm, 10-pin VSON package (DRC) with exposed thermal pad connected internally to GND. The package supports high-density PCB layouts and efficient heat dissipation in compact medical and telecom modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3851H50DRCR, the TPS3850H50DRCR lacks dedicated WDEN but retains identical SENSE accuracy, timing precision, and VSON-10 footprint - making it optimal for cost-sensitive, space-constrained designs where SET-pin watchdog control suffices. Against MAX6373KA29+T, TPS3850H50DRCR adds programmable window supervision and smaller package, enabling next-generation medical and telecom systems.

Availability

TPS3850H50DRCR is available at Aetrix Electronics and suitable for ultrasound scanners, active antenna systems, robot servo drives, and infusion pumps requiring stable component supply across extended product lifecycles and automotive-grade temperature ranges.

Supply support for TPS3850H50DRCR 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, embedded processing, and power management technologies, with decades of expertise in high-reliability supervisory ICs for mission-critical systems.

The TPS3850H50DRCR belongs to TI's precision voltage supervisor family, engineered specifically for applications demanding simultaneous rail monitoring and intelligent watchdog functionality - such as medical imaging, 5G infrastructure, and industrial automation.

FAQ

What is the operating temperature range for the TPS3850H50DRCR?

The TPS3850H50DRCR operates across a junction temperature range of –40°C to +125°C, validated per its electrical specifications and thermal metrics (RθJA = 52.3°C/W). This range supports deployment in harsh environments including under-hood automotive modules, outdoor telecom equipment, and sterilizable medical devices - all while maintaining 0.8% threshold accuracy and stable watchdog timing.

How does the TPS3850H50DRCR implement window watchdog functionality?

The TPS3850H50DRCR implements window watchdog functionality through a dual-boundary timing architecture: the lower boundary (tWDL) and upper boundary (tWDU) define a valid window for WDI falling edges. If WDI fails to transition within that window, WDO asserts low for the programmed RESET delay duration. Boundaries are set via CWD capacitor value and SET0/SET1 logic states, supporting ratios of 1:8, 3:4, or 1:2 - all verified in the TPS3850H50DRCR datasheet timing tables.

Can the TPS3850H50DRCR monitor multiple voltage rails simultaneously?

No, the TPS3850H50DRCR monitors only one voltage rail via its single SENSE pin. It is not a multi-rail supervisor. However, multiple TPS3850H50DRCR devices can be deployed in parallel to supervise different rails (e.g., VCORE, VI/O, analog supply), each with independent reset and watchdog timing - a common practice in ultrasound scanner mainboards and AAS radio units where rail-specific fault isolation is required.

What are the reset delay configuration options for the TPS3850H50DRCR?

The TPS3850H50DRCR offers three reset delay configuration methods: (1) factory-programmed default (170–230 ms, 9.5% accuracy), (2) 10-kΩ pullup resistor to VDD (8.5–11.5 ms), or (3) external capacitor on CRST (703 µs to 3.22 s, calculated per Equation 3). All options are evaluated automatically within 381 µs after SENSE re-enters the valid window - a behavior confirmed in the TPS3850H50DRCR functional description and timing diagrams.

Does the TPS3850H50DRCR support hysteresis, and what is its value?

Yes, the TPS3850H50DRCR provides 0.5% hysteresis on both overvoltage and undervoltage thresholds, implemented internally to prevent oscillation during slow supply ramps or noise-induced threshold crossings. This hysteresis value is specified in the Electrical Characteristics table and contributes directly to robust operation in servo drive power stages and infusion pump battery discharge profiles where supply slew rates are low.