Part Number: O3853QDCARQ1

Manufacturer: Texas Instruments

Description: PMIC Multi-rail power supply for microcontrollers in safety-relevant applications 48-HTSSOP -40 to 125

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O3853QDCARQ1 Description

A multi-rail power supply called the TPS653853-Q1 is made to power microcontrollers in safety-related applications like those in the automobile sector. The system is compatible with microcontrollers with either loosely coupled or dual-core lockstep (LS) architectures (LC).

The MCU, CAN, FlexRay, and external sensors are all powered by the TPS653853-Q1 device, which includes numerous supply rails. The input battery voltage ranges from 2.3 V to 36 V and is converted by a buck-boost converter with inbuilt FETs to a 6-V pre-regulator output, which powers the other regulators. A built-in charge pump supplies the internal regulators with an overdrive voltage and can also power an external NMOS FET for reverse battery protection.

The device contains a steering-angle monitoring (SAM) component that indirectly enables the ECU to gather information about the steering wheel position using the motor-position sensors. This SAM unit can continue to function even when the ECU is in sleep mode, thanks to a specific low-power mode. Integrated SAM switches allow the MotorPosition Sensor signals to be transmitted to the MCU during regular operation or decoupled from the MCU ADC inputs when the ECU sleeps.

A built-in self-test (BIST) is run automatically by the startup device; if necessary, the MCU may repeat the BIST during system run time through software control. The MCU can test the functionality of the TPS653853-Q1 thanks to a special DIAGNOSTIC state.

Through the SPI register, the TPS653853-Q1 device also can report errors. The device’s SPI register contains a separate status bit for each system or device error. When a specific error condition is identified, the device sets the relevant status bit and maintains it set until the MCU reads out the SPI register in which this status bit was set. The MCU can determine whether it must keep the system in a safe condition or whether it can continue system operation based on which status bit was set.

O3853QDCARQ1 Features

Application-Ready for Automotive Use

  • The Following Results Showed AEC-Q100 Qualification:
  • Device Temperature Grade 1: Ambient Operating Temperature, -40°C to +125°C.
  • Level 2 HBM ESD Classification for Devices
  • CDM ESD Classification Level C4B for devices.

Compliant with functional safety

For use in practical safety applications.

Available Documentation to Support ISO 26262 System Design Up to ASIL D

Hardware Integrity and Systematic Capability up to ASIL D.

Input Voltage Range

  • Initial Battery Power Up: 7 to 36-V.
  • Full functionality from 3.8 to 36 volts after initial battery power-up.
  • 3 V at a minimum while operating after awakening.

Supply Rails (With Internal FETs)

  • Preregulator for 6-V Synchronous Buck-Boost.
  • LDO at 5 V, 284 mA (CAN).
  • 350-mA, 3.3-V or 5-V LDO (MCU).
  • Two LDOs are safeguarded for peripheral or Sensor supply.

3.3-V or 5-V Fixed Output Voltage

Protection for batteries and shorts to ground.

  • Charge Pump: Minimum Voltage: 6 volts, Maximum Voltage: 11 volts above battery

Monitoring and Protection

  • Separate under- and over-voltages.
  • Monitoring of the battery voltage, internal supplies, and all regulator outputs.
  • The voltage monitoring circuitry, which has a distinct bandgap reference, is powered by a different battery input pin.
  • Continual Voltage Monitoring Self-Check.
  • All supplies are safeguarded with current limits, over temperature warnings, and shutdown mechanisms.

Steering-Angle Monitoring (SAM)

  • Two signal comparators for signals from position sensors.
  • Rotational Countdown.
  • Low-Power Mode With Regular Position Sensor Signal Sampling.
  • switches for passing sensor signals through to an MCU

Microcontroller Interface

  • Window opening and closing or question-answer watchdog functionality
  • Monitor for Lock-Step MCU Error Signals.
  • DIAGNOSTIC condition for System Diagnostics and Device Self-Tests.
  • After a system failure is detected, the device and system are safe.
  • Oscillator Clock Monitor for Internal.
  • Self-Test with Analog and Logic Built-In.
  • CRC on Non-Volatile Memory, SPI Communications, and Device and System Configuration Registers.
  • MCU reset circuit.
  • Pin for diagnostic output.

SPI on Command plus Data with CRC.

System-level and device-level errors are reported using SPI registers.

The enable-drive output disables external power stages when a system failure is detected.

Wake up using the CAN WU Pin or the IGN Pin (Ignition) (Transceiver or Other Function).

PowerPADTM HTSSOP 48-Pin IC Package.

Frequently Asked Questions

What do “single rail” and “multiple rails” mean?

When a power supply unit (PSU) is referred to as a “single rail,” the PSU uses only one power source.

When a power supply unit (PSU) is referred to as a “multiple-rail,” it divides the total amperage available across two or more “rails.”

What distinguishes the various PSU types?

If you have a high-performance PC, single-rail PSUs can be more convenient because you do not have to worry about balancing the power load across numerous rails. All you have to do is make sure your PSU can supply all the power needed by your system.

The two varieties of PSUs have no discernible differences in terms of safety. Although some contend that increased amperage delivered across a single rail poses hazards not present in multiple-rail PSUs with lesser amperage, we shall explain why this is untrue below.

Is it possible to have too many amps?

Some individuals question whether using a single rail carrying more amperage is less secure than using several rails, each of which can supply a smaller amperage. The answer is no, since both single-rail and multiple-rail PSUs contain the same protective circuitry.

Remember that when a PSU is mounted on a computer, the current is distributed over numerous cables while analyzing the overall amperage. Connecting to your motherboard, peripheral devices, GPU, and other components, you have connections. The multiple-rail design may be safer for your linked parts because a multiple-rail PSU can’t pull as much power over a single rail.

This guarantees that the entire amperage will never be drawn over a single power cable. Furthermore, no reliable PSU manufacturer offers PSU power cables with the impedance necessary to overload the wire.

In other words, safety is not a significant differentiator when deciding between a single-rail and multiple-rail PSU.


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