TPS7B6850QPWPRQ1

Features for the TPS7B68-Q1

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

Description for the TPS7B68-Q1

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.