TPS653850-Q1 (ACTIVE)

Multi-Rail Power Supply for Microcontrollers in Safety-Relevant Applications

Multi-Rail Power Supply for Microcontrollers in Safety-Relevant Applications - TPS653850-Q1

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The TPS653850-Q1 device is a multirail power supply designed to supply microcontrollers in safety relevant applications, such as those found in the automotive industry. The device supports microcontrollers with dual-core lockstep (LS) or loosely coupled architectures (LC).

The TPS653850-Q1 device integrates multiple supply rails to power the MCU, CAN or FlexRay, and external sensors. A buck-boost converter with internal FETs converts the input battery voltage between 2.3 V and 36 V to a 6-V preregulator output that supplies the other regulators. An integrated charge pump provides an overdrive voltage for the internal regulators, and can also be used to drive an external NMOS FET as reverse battery protection. The device supports wake-up from an ignition (IGN) signal or wake-up from a CAN transceiver signal.

An independent voltage monitoring unit inside the device monitors undervoltage and overvoltage on all internal supply rails and regulator outputs of the battery supply. Regulator current limits and temperature protections are also implemented. The TPS653850-Q1 device features a question-answer watchdog, MCU error-signal monitor, clock monitoring on internal oscillator, self-check on clock monitor, cyclic redundancy check (CRC) on non-volatile memory and SPI communication, a diagnostic output pin allowing MCU to observe device internal analog and digital signals, a reset circuit for the MCU and an enable output to disable external power-stages on any detected system-failure. A built-in self-test (BIST) allows for monitoring the device functionality at start-up. A dedicated DIAGNOSTIC state allows the MCU to check TPS653850-Q1 functionality.

The TPS653850-Q1 device also has an error reporting capability through the SPI register. The device has separate status bits in the SPI register for each specific error on the system level or device level. When the device detects a particular error condition, it sets the appropriate status bit and keeps this status bit set until the MCU reads-out the SPI register in which this status bit was set. Based on which status bit was set, the MCU can decide whether it must keep the system in a safe state or whether it can resume with the operation of the system.

The TPS653850-Q1 device is available in a 48-pin HTSSOP PowerPAD IC package.


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • Input Voltage Range
    • 7 to 36 V for Initial Battery Power Up
    • 3.8- to 36-V Full Functionality After Initial Battery Power Up
    • Minimum 2.3 V During Operation After Wake-up
  • Supply Rails
    • 6-V Synchronous Buck-Boost Preregulator With Internal FETs
    • 5-V, 284-mA (CAN) LDO With Internal FET
    • 3.3-V or 5-V, 350-mA (MCU IO) LDO With Internal FET
    • 2 Sensor Supply LDOs With Internal FETs
      • 120 mA for Sensor Supply 1, 60 mA for Sensor Supply 2
      • Configurable Tracking Mode (Tracking Input Pin), or 3.3-V or 5-V Fixed Output Voltage
      • Short-to-Ground and Battery Protection
    • Charge Pump: 6-V Minimum, 11-V Maximum Above Battery Voltage
  • Monitoring and Protection
    • Independent Undervoltage and Overvoltage Monitoring on All Regulator Outputs, Battery Voltage, and Internal Supplies
    • Voltage Monitoring Circuitry, Including Independent Bandgap Reference, Supplied from Separate Battery Voltage Input Pin
    • Self-Check on All Voltage Monitoring (During Power-Up and After Power-Up Initiated by External MCU)
    • All Supplies Protected With Current Limit and Overtemperature Prewarning and Shutdown
  • Microcontroller Interface
    • Open and Close Window or Question-Answer Watchdog Function
    • Lock-Step MCU Error-Signal Monitor
    • DIAGNOSTIC state for Performing Device Self-Tests and System Diagnostics
    • SAFE State for Device and System Protection upon Detected System Failure
    • Clock Monitor for Internal Oscillator
    • Analog and Logic Built-In Self-Test
    • CRC on Non-Volatile Memory as well as Device and System Configuration Registers and SPI Communications
    • Reset Circuit for MCU
    • Diagnostic Output Pin
  • SPI With CRC on Command Plus Data
  • Error Reporting Through SPI Registers for Errors on System Level and Device Level
  • Enable-Drive Output for Disabling External Power-Stages on Any Detected System Failure
  • Wake-up through IGNITION Pin or CAN WAKUP Pin
  • 48-Pin HTSSOP PowerPAD™ IC Package

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Parametrics Compare all products in Power Management Multi-Channel IC (PMIC) Solutions

Regulated Outputs (#)
Processor Supplier
Processor Name
Vin (Min) (V)
Vin (Max) (V)
Step-Up DC/DC Controller
Step-Down DC/DC Controller
Operating Temperature Range (C)
Texas Instruments, Infineon, NXP, Renesas, STM   
TMS570, RM570, various dual core lockstep MCUs   
MCU Interface
Power Supply and System Monitoring   
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