Packaging information
| Package | Pins HTSSOP (PWP) | 28 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 2,000 | LARGE T&R |
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.