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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

Rating Automotive Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 0.4, 0.84, 0.86, 0.864, 0.9, 0.936, 1.06, 1.116, 1.12, 1.15, 1.152, 1.248, 1.284, 1.67, 1.674, 1.73, 1.8, 1.926, 2.325, 2.33, 2.4, 2.6, 2.675, 2.79, 2.88, 3, 3.069, 3.07, 3.168, 3.17, 3.432, 3.531, 4.65, 4.8, 5, Adjustable Features Reset time delay, Separate VDD & sense, Timeout watchdog, Undervoltage and overvoltage monitor, Watchdog disable, Watchdog timer, Window watchdog Reset threshold accuracy (%) 1 Iq (typ) (mA) 0.01 Output driver type/reset output Active-low, Open-drain Time delay (ms) 10, 200 Watchdog timer WDI (s) Programmable TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
Rating Automotive Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 0.4, 0.84, 0.86, 0.864, 0.9, 0.936, 1.06, 1.116, 1.12, 1.15, 1.152, 1.248, 1.284, 1.67, 1.674, 1.73, 1.8, 1.926, 2.325, 2.33, 2.4, 2.6, 2.675, 2.79, 2.88, 3, 3.069, 3.07, 3.168, 3.17, 3.432, 3.531, 4.65, 4.8, 5, Adjustable Features Reset time delay, Separate VDD & sense, Timeout watchdog, Undervoltage and overvoltage monitor, Watchdog disable, Watchdog timer, Window watchdog Reset threshold accuracy (%) 1 Iq (typ) (mA) 0.01 Output driver type/reset output Active-low, Open-drain Time delay (ms) 10, 200 Watchdog timer WDI (s) Programmable TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
VSON (DRC) 10 9 mm² (3 mm × 3 mm)
  • 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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Top documentation Type Title Format options Date
* Data sheet TPS3850-Q1 Precision Voltage Supervisor with Programmable Window Watchdog Timer datasheet (Rev. B) PDF | HTML May 20, 2021
White paper Designing a Power Supply for a Safety MCU to Meet Functional Safety ASIL B PDF | HTML Nov 15, 2023
Functional safety information TPS3850-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) PDF | HTML May 17, 2021
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun 28, 2019
Technical article How voltage references and supervisors help achieve ASIL functional safety goals PDF | HTML May 10, 2019
Technical article How diagnostics help your ADAS design achieve higher levels of functional safety PDF | HTML May 6, 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
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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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Reference design

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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 (...)
Supported products & hardware
Reference design

PMP31273 — Automotive dual buck converter reference design for C2000™ MCU with supervisor and watchdog

This reference design is a flexible and compact power supply providing 5-V and 3.3-V output rails to supply the C2000™ MCU. The design includes two LMR34206-Q1 ultra-small synchronous step-down converter devices and one TPS3850-Q1 precision voltage supervisor with programmable window watchdog (...)
Supported products & hardware
Reference design

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 (...)

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VSON (DRC) 10 Ultra Librarian
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