Overview
The O3854AQDCARQ1, produced by Texas Instruments, is a multirail power supply designed specifically for safety-relevant applications, particularly in the automotive and industrial sectors. This device is part of the TPS653854A-Q1 series and is engineered to power microcontrollers and other critical components in demanding environments. It integrates multiple supply rails, including a buck-boost converter, linear dropout (LDO) regulators, and various protection mechanisms to ensure reliable operation.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | HTSSOP (DCA) 48-pin |
| Package Size | 12.50 mm × 6.10 mm |
| Operating Temperature Range | -40°C to +125°C |
| Input Voltage Range | 7 to 36 V (initial battery power up), 4 to 36 V (full functionality after initial power up), minimum 2.3 V during operation after wake-up |
| Supply Rails | 6-V synchronous buck-boost pre-regulator, 5-V 285-mA LDO, 3.3-V or 5-V 350-mA LDO (MCU), 120 mA for Sensor Supply 1, 20 mA for Sensor Supply 2 |
| ESD Classification | HBM Level 2, CDM Level C4B |
| Functional Safety Compliance | ISO 26262 ASIL D, Systematic Capability and Hardware Integrity up to ASIL D |
| Wake-Up Mechanism | Wake-up through IGN pin (ignition) or CAN_WU pin (CAN transceiver or other signal) |
Key Features
- Internal FETs for buck-boost converter to convert input battery voltage to a 6-V pre-regulator output
- Multiple LDO regulators: 5-V 285-mA for CAN or peripherals, 3.3-V or 5-V 350-mA for MCU, and 120 mA and 20 mA for sensor supplies
- Configurable tracking mode or fixed output voltage
- Short-to-ground and battery protection with charge pump for overdrive voltage
- Independent undervoltage and overvoltage monitoring on all regulator outputs and battery voltage
- Current limit and overtemperature protection for all supplies
- Steering-angle monitoring (SAM) unit for capturing steering wheel position through motor-position sensors
- Low-power mode with periodic sampling of position sensor signals
- Microcontroller interface with watchdog, error-signal monitor, clock monitor, and diagnostic output pin
- Built-in self-test (BIST) and error reporting through SPI registers
- Functional safety compliance with ISO 26262 ASIL D
Applications
- Automotive safety-relevant applications, such as advanced driver-assistance systems (ADAS), autonomous vehicles, and safety-critical control units
- Industrial safety-relevant applications, including control systems and safety-critical industrial automation
Q & A
- What is the primary function of the O3854AQDCARQ1?
The O3854AQDCARQ1 is a multirail power supply designed to power microcontrollers and other components in safety-relevant applications.
- What is the input voltage range for the O3854AQDCARQ1?
The input voltage range is 7 to 36 V for initial battery power up, 4 to 36 V for full functionality after initial power up, and a minimum of 2.3 V during operation after wake-up.
- What types of LDO regulators are included in the O3854AQDCARQ1?
The device includes a 5-V 285-mA LDO for CAN or peripherals, a 3.3-V or 5-V 350-mA LDO for the MCU, and 120 mA and 20 mA LDOs for sensor supplies.
- Does the O3854AQDCARQ1 support functional safety standards?
Yes, it is compliant with ISO 26262 ASIL D and supports functional safety microcontrollers with dual-core lockstep and other multi-core architectures.
- What protection mechanisms are built into the O3854AQDCARQ1?
The device includes short-to-ground and battery protection, independent undervoltage and overvoltage monitoring, current limit, and overtemperature protection.
- How does the O3854AQDCARQ1 support low-power operation?
The device features a low-power mode with periodic sampling of position sensor signals, allowing it to operate even when the ECU is in sleep mode.
- What is the purpose of the steering-angle monitoring (SAM) unit in the O3854AQDCARQ1?
The SAM unit allows the ECU to indirectly capture the position of the steering wheel through motor-position sensors.
- How does the O3854AQDCARQ1 interface with the microcontroller?
The device includes a microcontroller interface with watchdog, error-signal monitor, clock monitor, and diagnostic output pin, as well as SPI communication with CRC.
- Does the O3854AQDCARQ1 support built-in self-testing?
Yes, the device automatically runs a built-in self-test (BIST) at startup and allows the MCU to re-run the BIST during system runtime through software control.
- What package type and size does the O3854AQDCARQ1 come in?
The device is available in a 48-pin HTSSOP (DCA) package with dimensions of 12.50 mm × 6.10 mm.
