Texas Instruments TPS3850G50QDRCRQ1

Overview

TPS3850G50QDRCRQ1 from Texas Instruments is an AEC-Q100 Grade 1 precision voltage supervisor with integrated programmable window watchdog timer, designed for automotive power-rail monitoring. It delivers ±0.8% overvoltage/undervoltage threshold accuracy across –40°C to +125°C, supports 1.6 V–6.5 V supply, and features open-drain RESET/WDO outputs with factory- or capacitor-programmable timing. It is deployed in ADAS domain controllers and digital cockpit processing units.

For engineers reviewing the TPS3850G50QDRCRQ1 datasheet, TPS3850G50QDRCRQ1 pinout, TPS3850G50QDRCRQ1 application, or TPS3850G50QDRCRQ1 equivalent, key selection criteria include its 0.5% hysteresis, 4%/7% fault window options, watchdog disable capability via SET pins, and wettable-flank VSON-10 package for automated optical inspection.

Technical Context

The TPS3850G50QDRCRQ1 implements a dual-comparator window architecture with trimmed resistor divider and precision reference to achieve 0.8% threshold accuracy over temperature. Its state machine evaluates CRST and CWD pins every time SENSE re-enters the valid window, with 381 µs initialization delay (tINIT) before timing configuration lock-in.

Watchdog operation uses independent upper/lower boundary timers (tWDU/tWDL) set by CWD capacitor and SET0/SET1 logic states-enabling selectable ratios of 1/8, 1/2, or 3/4. RESET assertion is triggered by SENSE crossing either VIT+(OV) or VIT−(UV), followed by a user-defined tRST delay before deassertion.

Key Specifications

Pinout & Package

TPS3850G50QDRCRQ1 is housed in a 3.00 mm × 3.00 mm, 10-pin VSON package with exposed thermal pad connected internally to GND. Wettable flanks support automated optical inspection of solder joints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.

Compared with TPS3850G50QDRCRQ1, the TPS3851G50QDRCRQ1 adds NMI functionality for layered fault response, while the MAX6373KA29+T offers lower cost and simpler integration at the expense of programmability, watchdog capability, and automotive qualification.

Availability

TPS3850G50QDRCRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, digital cockpit processing units, and on-board chargers requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for TPS3850G50QDRCRQ1 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 deep expertise in automotive-grade power management and functional safety solutions.

The TPS3850-Q1 product line was engineered specifically for ASIL-B/C automotive systems requiring simultaneous voltage supervision and window watchdog functionality in compact, thermally robust packages.

FAQ

What is the operating temperature range for the TPS3850G50QDRCRQ1?

The TPS3850G50QDRCRQ1 is qualified per AEC-Q100 Grade 1, supporting continuous operation from –40°C to +125°C ambient temperature. Its ±0.8% voltage threshold accuracy is guaranteed across this full range, making it suitable for under-hood and infotainment applications where thermal stability is critical. The device's internal reference and trimmed resistors maintain performance without external calibration.

How does the TPS3850G50QDRCRQ1 implement window watchdog functionality?

The TPS3850G50QDRCRQ1 implements a true window watchdog using independent upper (tWDU) and lower (tWDL) timing boundaries. A falling edge on WDI must occur strictly between these boundaries to prevent WDO assertion. Ratio selection (1/8, 1/2, 3/4) is controlled by SET0/SET1, while absolute timing is set via CWD capacitor or factory defaults-enabling precise fault-window detection unmatched by standard timeout watchdogs.

Can the TPS3850G50QDRCRQ1 monitor voltages below 0.9 V?

No-the TPS3850G50QDRCRQ1 supports common rails from 0.9 V to 5.0 V per datasheet specification. For sub-0.9 V monitoring (e.g., 0.4 V core rails), the adjustable variant TPS3850H01Q1 must be used, which replaces window comparison with single-threshold undervoltage detection. The TPS3850G50QDRCRQ1 is optimized for fixed-threshold, high-accuracy window supervision of standard automotive rails.

What package type and dimensions does the TPS3850G50QDRCRQ1 use?

The TPS3850G50QDRCRQ1 uses a 3.00 mm × 3.00 mm, 10-pin VSON package (DRC) with wettable flanks. The exposed thermal pad is internally connected to GND and must be soldered to a large-area ground plane. This package enables high-density automotive PCB layouts and supports automated optical inspection-critical for zero-defect manufacturing in safety-critical systems.

Does the TPS3850G50QDRCRQ1 support watchdog disable during development?

Yes-the TPS3850G50QDRCRQ1 allows permanent watchdog disable via logic states on SET0 and SET1 pins (e.g., SET0 = 1, SET1 = 0). When disabled, WDI is ignored and WDO remains high-impedance regardless of input activity. This eliminates spurious timeouts during firmware bring-up and debugging-without requiring hardware changes or external jumpers.