Product details

Output options Fixed Output Iout (Max) (A) 0.5 Vin (Max) (V) 40 Vin (Min) (V) 4 Vout (Max) (V) 5 Vout (Min) (V) 3.3 Fixed output options (V) 3.3, 5 Iq (Typ) (mA) 0.019 Thermal resistance θJA (°C/W) 38 TI functional safety category Functional Safety-Capable Rating Automotive Load capacitance (Min) (µF) 4.7 Regulated outputs (#) 1 Features Enable, Power Good, Watchdog Timer Accuracy (%) 2 PSRR @ 100 KHz (dB) 50 Dropout voltage (Vdo) (Typ) (mV) 150 Operating temperature range (C) -40 to 125
Output options Fixed Output Iout (Max) (A) 0.5 Vin (Max) (V) 40 Vin (Min) (V) 4 Vout (Max) (V) 5 Vout (Min) (V) 3.3 Fixed output options (V) 3.3, 5 Iq (Typ) (mA) 0.019 Thermal resistance θJA (°C/W) 38 TI functional safety category Functional Safety-Capable Rating Automotive Load capacitance (Min) (µF) 4.7 Regulated outputs (#) 1 Features Enable, Power Good, Watchdog Timer Accuracy (%) 2 PSRR @ 100 KHz (dB) 50 Dropout voltage (Vdo) (Typ) (mV) 150 Operating temperature range (C) -40 to 125
HTSSOP (PWP) 28 43 mm² 9.7 x 4.4
  • Qualified for automotive applications
  • 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
  • Maximum output current: 500 mA
  • 4-V to 40-V wide VIN input-voltage range with up to 45-V transients
  • Fixed 3.3-V and 5-V outputs
  • Maximum dropout voltage: 600 mV at 500 mA
  • Stable with output capacitor in wide-range of capacitance (4.7 µF to 500 µF) and ESR (0.001 Ω to 20 Ω)
  • Low quiescent current (I(Q)):
    • < 4 µA when EN is low (shutdown mode)
    • 19 µA typical at light loads with WD_EN high (watchdog disabled)
  • Configurable for window watchdog or standard watchdog
  • Open-to-closed window ratio configurable as 1:1 or 8:1
  • Fully adjustable watchdog period (from 10 ms to 500 ms)
  • 10% accurate watchdog period
  • Dedicated WD_EN pin to control watchdog ON-OFF
  • Fully adjustable power-good threshold and power-good delay period
  • Low Input-voltage tracking to UVLO
  • Integrated fault protection:
    • Overload current-limit protection
    • Thermal shutdown
  • 28-Pin HTSSOP package
  • Qualified for automotive applications
  • 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
  • Maximum output current: 500 mA
  • 4-V to 40-V wide VIN input-voltage range with up to 45-V transients
  • Fixed 3.3-V and 5-V outputs
  • Maximum dropout voltage: 600 mV at 500 mA
  • Stable with output capacitor in wide-range of capacitance (4.7 µF to 500 µF) and ESR (0.001 Ω to 20 Ω)
  • Low quiescent current (I(Q)):
    • < 4 µA when EN is low (shutdown mode)
    • 19 µA typical at light loads with WD_EN high (watchdog disabled)
  • Configurable for window watchdog or standard watchdog
  • Open-to-closed window ratio configurable as 1:1 or 8:1
  • Fully adjustable watchdog period (from 10 ms to 500 ms)
  • 10% accurate watchdog period
  • Dedicated WD_EN pin to control watchdog ON-OFF
  • Fully adjustable power-good threshold and power-good delay period
  • Low Input-voltage tracking to UVLO
  • Integrated fault protection:
    • Overload current-limit protection
    • Thermal shutdown
  • 28-Pin HTSSOP package

In automotive microcontroller or microprocessor power-supply applications, the watchdog is used to monitor the microcontroller working status to prevent software runaway. The watchdog must be independent of the microcontroller in a reliable system.

The TPS7B68-Q1 is a 500-mA watchdog LDO designed for an operating voltage up to 40 V, with typical quiescent current of only 19 µA at light load. The device integrates a programmable function for selecting a window or standard watchdog, with an external resistor to set the watchdog time within 10% accuracy.

The PG pin on the TPS7B68-Q1 indicates when the output voltage is stable and in regulation. The power-good delay period and power-good threshold can be adjusted by external components. The device also features an integrated short-circuit and overcurrent protection. The combination of such features makes this device particularly flexible and suitable to supply microcontroller systems in automotive applications.

In automotive microcontroller or microprocessor power-supply applications, the watchdog is used to monitor the microcontroller working status to prevent software runaway. The watchdog must be independent of the microcontroller in a reliable system.

The TPS7B68-Q1 is a 500-mA watchdog LDO designed for an operating voltage up to 40 V, with typical quiescent current of only 19 µA at light load. The device integrates a programmable function for selecting a window or standard watchdog, with an external resistor to set the watchdog time within 10% accuracy.

The PG pin on the TPS7B68-Q1 indicates when the output voltage is stable and in regulation. The power-good delay period and power-good threshold can be adjusted by external components. The device also features an integrated short-circuit and overcurrent protection. The combination of such features makes this device particularly flexible and suitable to supply microcontroller systems in automotive applications.

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Technical documentation

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Type Title Date
* Data sheet TPS7B68-Q1 500-mA 40-V high-voltage ultralow quiescent-current watchdog LDO datasheet (Rev. C) 14 Feb 2019
Technical article 3 quiescent-current (Iq) specifications you need to understand 12 Nov 2021
Functional safety information TPS7B68xx-Q1 Functional Safety FIT Rate and Failure Mode Distribution 17 Dec 2019
Technical article Discrete SBCs: versatile and scalable solutions for any application 27 Jul 2017

Design & development

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Evaluation board

TPS7B6850EVM — TPS7B6850-Q1 500-mA watchdog LDO regulator evaluation module

The TPS7B6850EVM evaluation module (EVM) helps you evaluate the operation and performance of the TPS7B6850-Q1 watchdog low-dropout (LDO) regulator. The TPS7B6850-Q1 device is a monolithic integrated 40-V 500-mA watchdog LDO regulator in a 28-pin HTSSOP (...)
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Simulation model

TPS7B6833-Q1 PSpice Transient Model

SLVMBW4.ZIP (139 KB) - PSpice Model
Simulation model

TPS7B6850-Q1 PSpice Transient Model

SLVMBW5.ZIP (143 KB) - PSpice Model
Package Pins Download
HTSSOP (PWP) 28 View options

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