TB9045FNG-110
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TB9045FNG-110 TOSHIBA BiCMOS Integrated Circuit Bi-CMOS Silicon Monolithic DCDC Convertor & Multi Output Regulator TB9045FNG is a multi output power supply IC for automotive system power supply incorporating 2 DCDC convertors, a series power supply and 3 tracking regulators. Both high efficiency and low noise output are concurrently achieved by a DCDC power supply and a series power supply, respectively. It incorporates various monitoring functions for abnormalities in power supply and MCU, and enables transmitting monitoring statuses to an external system via SPI communication. 1. Features • 2 DCDC convertor circuits > DCDC1: Synchronous rectifying buck-boost convertor with built-in 6V output > DCDC2: Synchronous rectifying buck convertor with built-in 1V system output • 4 built-in output series power supply circuits > LDO1: Output voltage 5.0V > TR1 to 3 output voltage LDO1 and tuning voltage (3 ch) • Output voltage monitoring & reset output > High voltage & low voltage & overcurrent monitoring > Power-on reset (2-channel output pins) • Built-in SPI communication > To output notification signals for various abnormalities in a power supply function • 2-channel built-in reference voltage circuits (Main function and monitoring function) • Built-in oscillator circuit • Built-in frequency monitoring function for oscillator circuit • Built-in Analog BIST • Built-in Logic BIST • Operating temperature range: -40 to 125 °C 1.1 -'• TM-SIL™ > Developed according to ISO 26262 ASIL-D > Safety Manual and Safety Analysis Report > Functional redundancy and built-in ABIST and LBIST > SPI interface with CRC check The product(s) is/are compatible with RoHS regulations (EU directive 2011 / 65 / EU) as indicated, if any, on the packaging label ("[[G]]/RoHS COMPATIBLE", "[[G]]/RoHS [[Chemical symbol(s) of controlled substance(s)]]", "RoHS COMPATIBLE" or "RoHS COMPATIBLE, [[Chemical symbol(s) of controlled substance(s)]]>MCV"). © 2015-2019 2019-12-10 Toshiba Electronic Devices & Storage Corporation

IGN_IN CAN_IN SDOUT SCLK ERROR Logic ※ ovd : Over Voltage Detection uvd : Under Voltage Detection ocd : Over Current Detection Note: The block diagram may show some of the functional blocks, circuits, or constants in abbreviated or simplified format for clarity in describing the relevant features. © 2015-2019 Toshiba Electronic Devices & Storage Corporatio

Toshiba Electronic Devices & Storage Corpo

Toshiba Electronic Devices & Storage Corporation

TB9045FNG-110 5. Functional description Some of the functional blocks of the block diagram of this chapter, the circuit or constant labels, might have been omitted or simplified for clarity. DCDC Convertor DCDC1 It is buck-boost DCDC convertor with input voltage VB1/2 and 6V output voltage. For buck mode, it is a synchronous rectifying type incorporating output driver MOS and rectification MOS. For boost mode, it is a diode rectifying type having external driver MOS and rectifier diode.  Switching frequency is 400 kHz.  It incorporates functions of overcurrent detection and high/low...

TB9045FNG-110 At the time of using DCDC convertor for buck mode (DC1SW1) Over Current Detection (DC1SW2) DCDC Cotrol Error Logic Under Voltage Detection Over Voltage Detection (vbg2) VBG2 © 2015-2019 Toshiba Electronic Devices & Storage Corporation

TB9045FNG-110 DCDC2 It is buck DCDC convertor with 6V input voltage (DCDC1). It is a synchronous rectifying type incorporating output driver MOS and rectification MOS. 6V output from DCDC1 convertor must be used as input voltage.  Maximum output current is 800mA. (Set current consumption considering allowable dissipation and heat generation.)  It incorporates functions of overcurrent detection and high/low voltage detection. It incorporates phase compensating capacitor. The capacitor connected to DC2Css pin can control voltage rising time. Over Current Detection Under Voltage Detection...

TB9045FNG-110 Series Power Supply LDO1  It is a series power supply incorporating output driver MOS. 6V output from DCDC1 convertor must be used as input voltage. Output voltage is 5V±0.1V, and output current maximum 400mA. It incorporates functions of overcurrent detection and high/low voltage detection. (Set current consumption considering allowable dissipation and heat generation.) It incorporates phase compensating capacitor. (ldo1idet) Over Current Detection Error Logic Under Voltage Detection Over Voltage Detection (vbg2) VBG2 © 2015-2019 Toshiba Electronic Devices & Storage...

It is a tracker power supply incorporating output driver MOS. Output voltage is linked with LDO1. Output current of TR1, TR2 or TR3 is maximum 100mA. It incorporates functions of overcurrent detection (minimum 100mA for TR1, TR2 and TR3 respectively) and high/low voltage detection (TR1, TR2, and TR3). (Set current consumption considering allowable dissipation and heat generation.) It enables turning off TR1, TR2 and TR3 independently via SPI communication. DCDC1 LDO1IN Over Current Detection Error Logic Under Voltage Detection Over Voltage Detection (vbg2) VBG2 © 2015-2019 Toshiba...

TB9045FNG-110 Abnormality Detection Function It incorporates abnormality detection function as follows. Reset output system diagram at the time of abnormality detection (VDD) NRST Output Buffer © 2015-2019 Toshiba Electronic Devices & Storage Corporation

Power supply operational matrix (Initial value as register setting) * Relaunch of power supply input VB1,VB2 and VB3 or relaunch by IGN_IN/CAN_IN/MCU_IN control is required to release off-latch (mode). * “During start-up” is defined as the period until low voltage detection of each power supply is released, and “after startup (in operation)” as the subsequent period. * During off-latch (mode) or turning off, output voltage is proactively discharged with a discharge resistor and turned off. * If restart is requested during discharging, start-up operation is executed even with discharging. ■...