The TPS65381-Q1 device is a multi-rail power supply designed to supply microcontrollers in safety applications, such as those found in automotive applications. The device supports Texas Instruments’ TMS570LS series 16- bit or 32-bit RISC flash MCU and other microcontrollers with dual-core lockstep (LS) or loosely-coupled architectures (LC).
The TPS65381-Q1 device integrates multiple supply rails to power the MCU, CAN, or FlexRay, and an external sensor. An asynchronous-buck switch-mode power-supply converter with an internal FET converts the input battery voltage to a 6-V pre-regulator output. This 6-V pre-regulator supplies the other regulators. Furthermore, the device supports wake-up from IGNITION or wake-up from the CAN transceiver.
A fixed 5-V linear regulator with an internal FET is integrated to be used as, for example, a CAN supply. A second linear regulator, also with an internal FET, regulates the 6 V to a selectable 5-V or 3.3-V MCU I/O voltage.
The TPS65381-Q1 device comprises a linear regulator controller with an external FET and resistor divider that regulates the 6 V to an externally adjustable core voltage of between 0.8 V and 3.3 V.
The device comprises a sensor supply with short-to-ground and short-to-battery protection. Therefore this supply can power a sensor outside the electronic-control unit (ECU).
The device has an integrated charge pump to provide overdrive voltage for the internal regulators. Reverse-battery protection is obtained by using the charge-pump output to control an external NMOS transistor. This solution allows for a lower minimum-battery-voltage operation compared to a traditional reverse-battery blocking diode.
The device monitors undervoltage and overvoltage on all regulator outputs, battery voltage, and internal supply rails. A second band-gap reference, independent from the main band-gap reference, is used for the undervoltage and overvoltage monitoring, to avoid any drifts in the main band-gap reference from being undetected. In addition, regulator current-limits and temperature protections are implemented.
The TPS65381-Q1 safety functions feature a question-answer watchdog, MCU error-signal monitor, clock monitoring on internal oscillators, self-check on the clock monitor, CRC on non-volatile memory, a diagnostic output pin allowing the MCU to observe the internal analog and digital signals of the device, a reset circuit for the MCU, and an enable output to disable the safing-path or external power-stages on any detected system-failure. A built-in self-test (BIST) monitors the device functionality at start-up. A dedicated DIAGNOSTIC state allows the MCU to check TPS65381-Q1 safety functions.
The TPS65381-Q1 device is offered in an HTSSOP-32 PowerPAD package.
|Regulated Outputs (#)|
|Vin (Min) (V)|
|Vin (Max) (V)|
|Vout (Max) (V)|
|Step-Up DC/DC Controller|
|Step-Up DC/DC Converter|
|Step-Down DC/DC Converter|
|Iout (Max) (A)|
|Iq (Typ) (mA)|
|Operating Temperature Range (C)|
|Approx. Price (US$)|
| Adjustable |
Low Iq Current
|-40 to 125|
|2.57 | 1ku|
|Sample & Buy|