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TPS3850-Q1

ACTIVE

Automotive, window supervisor for OV & UV monitoring with window watchdog timer & programmable delay

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Data sheet

TPS3850-Q1

ACTIVE
Data sheet Order now

Product details

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) Adjustable, 0.84, 0.86, 1.06, 1.12, 1.15, 1.67, 1.73, 2.33, 2.4, 2.79, 2.88, 3.07, 3.17, 4.65, 4.8 Features Undervoltage and overvoltage monitor, Watchdog disable, Watchdog timer, Window watchdog Reset threshold accuracy (%) 1 Output driver type/reset output Active-low, Open-drain Time delay (ms) Programmable TI functional safety category Functional Safety-Capable Rating Automotive Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 125
Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) Adjustable, 0.84, 0.86, 1.06, 1.12, 1.15, 1.67, 1.73, 2.33, 2.4, 2.79, 2.88, 3.07, 3.17, 4.65, 4.8 Features Undervoltage and overvoltage monitor, Watchdog disable, Watchdog timer, Window watchdog Reset threshold accuracy (%) 1 Output driver type/reset output Active-low, Open-drain Time delay (ms) Programmable TI functional safety category Functional Safety-Capable Rating Automotive Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 125
VSON (DRC) 10 9 mm² 3 x 3
  • AEC-Q100 Qualified with the following results:
    • Device temperature grade 1: –40°C to 125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Functional Safety-capable
  • Input voltage range: VDD = 1.6 V to 6.5 V
  • 0.8% Voltage threshold accuracy (Maximum)
  • Low supply current: IDD = 10 µA (typical)
  • User-programmable watchdog timeout
  • User-programmable reset delay
  • Factory programmed precision watchdog and reset timers
  • Open-drain outputs
  • Precision over- and undervoltage monitoring:
    • Supports common rails from 0.9 V to 5.0 V
    • 4% and 7% Fault windows available
    • 0.5% Hysteresis
  • Watchdog disable feature
  • Available in a small 3-mm × 3-mm, 10-Pin VSON package
  • AEC-Q100 Qualified with the following results:
    • Device temperature grade 1: –40°C to 125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Functional Safety-capable
  • Input voltage range: VDD = 1.6 V to 6.5 V
  • 0.8% Voltage threshold accuracy (Maximum)
  • Low supply current: IDD = 10 µA (typical)
  • User-programmable watchdog timeout
  • User-programmable reset delay
  • Factory programmed precision watchdog and reset timers
  • Open-drain outputs
  • Precision over- and undervoltage monitoring:
    • Supports common rails from 0.9 V to 5.0 V
    • 4% and 7% Fault windows available
    • 0.5% Hysteresis
  • Watchdog disable feature
  • Available in a small 3-mm × 3-mm, 10-Pin VSON package

The TPS3850-Q1 combines a precision voltage supervisor with a programmable window watchdog timer. The TPS3850-Q1 window comparator achieves 0.8% accuracy (–40°C to +125°C) for both overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds on the SENSE pin. The TPS3850-Q1 also includes accurate hysteresis on both thresholds, making the device ideal for use with tight tolerance systems. The supervisor RESET delay can be set by factory-programmed default delay settings, or programmed by an external capacitor. The factory-programmed RESET delay features a 9.5% accuracy, high-precision delay timing.

The TPS3850-Q1 includes a programmable window watchdog timer for a wide variety of applications. The dedicated watchdog output ( WDO) enables increased resolution to help determine the nature of fault conditions. The window watchdog timeouts can be set by factory-programmed default delay settings, or programmed by an external capacitor. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3850-Q1 is available in a small 3.00-mm × 3.00-mm, 10-pin VSON package. The TPS3850-Q1 features wettable flanks for easy optical inspection.

The TPS3850-Q1 combines a precision voltage supervisor with a programmable window watchdog timer. The TPS3850-Q1 window comparator achieves 0.8% accuracy (–40°C to +125°C) for both overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds on the SENSE pin. The TPS3850-Q1 also includes accurate hysteresis on both thresholds, making the device ideal for use with tight tolerance systems. The supervisor RESET delay can be set by factory-programmed default delay settings, or programmed by an external capacitor. The factory-programmed RESET delay features a 9.5% accuracy, high-precision delay timing.

The TPS3850-Q1 includes a programmable window watchdog timer for a wide variety of applications. The dedicated watchdog output ( WDO) enables increased resolution to help determine the nature of fault conditions. The window watchdog timeouts can be set by factory-programmed default delay settings, or programmed by an external capacitor. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3850-Q1 is available in a small 3.00-mm × 3.00-mm, 10-pin VSON package. The TPS3850-Q1 features wettable flanks for easy optical inspection.
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Technical documentation

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Type Title Date
* Data sheet TPS3850-Q1 Precision Voltage Supervisor with Programmable Window Watchdog Timer datasheet (Rev. B) PDF | HTML 20 May 2021
Functional safety information TPS3850-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) PDF | HTML 17 May 2021
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Technical article How voltage references and supervisors help achieve ASIL functional safety goals 10 May 2019
Technical article How diagnostics help your ADAS design achieve higher levels of functional safety 06 May 2019

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS3850EVM-781 — TPS3850 high-accuracy supervisor with window watchdog timer evaluation module

The TPS3850EVM-781 evaluation module (EVM) is designed for a typical configuration to evaluate the operation and performance of the TPS3850 low-quiescent current (Iq), 0.8% accurate supervisor with integrated watchdog timer.
User guide: PDF
Not available on TI.com
Simulation model

TPS3850 PSpice Transient Model (Rev. A)

SBVM649A.ZIP (67 KB) - PSpice Model
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Simulation model

TPS3850 Unencrypted PSpice Transient Model (Rev. A)

SBVM648A.ZIP (9 KB) - PSpice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

PMP22650 — GaN-based, 6.6-kW, bidirectional, onboard charger reference design

The PMP22650 reference design is a 6.6-kW, bidirectional, onboard charger. The design employs a two-phase totem pole PFC and a full-bridge CLLLC converter with synchronous rectification. The CLLLC utilizes both frequency and phase modulation to regulate the output across the required regulation (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-050008 — ADAS power reference design with improved voltage supervision

This automotive power reference design supports additional precision voltage supervision and window watchdog for safety MCUs in advanced driver assistance systems (ADAS). These ADAS systems can control driving functions, such as automated emergency brake, lane keep assist and adaptive cruise (...)
Design guide: PDF
Schematic: PDF
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VSON (DRC) 10 View options

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