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System Power Supply for Automotive

With the increasing performance of automotive electronic devices, it is becoming essential to increase the current capability and the number of outputs of power supply ICs. To address these needs, Toshiba offers system power supply ICs with an integrated DC/DC converter. The latest addition to our portfolio of system power supply ICs, the TB9044FNG, is ideal for power supply applications for electronic power steering systems that require an extremely high level of safety.

System Power Supply ICs (Series Power Supplies)
System Power Supply ICs (DC-DC Converter Power Supply)

TB9044FNG Overview

More and more safety-critical automotive systems, such as electric power steering (EPS) and braking, are required to satisfy ASIL D[Note1], the highest automotive safety integrity level prescribed in the ISO 26262 functional safety standards.

The new IC integrates various failure detection functions, such as high-voltage and low-voltage detection and overheat detection of power supply circuit, to monitor against the IC’s own failure, and a watchdog timer to monitor failure detection of the external microcomputer. An initial diagnosis circuit to detect latent faults in the failure detection circuits is also incorporated to secure higher functional safety.

Note1: ASIL: Automotive Safety Integrity Level

Low-voltage operation (VB: 2.7V~), 3ch Power Supply for Sensors
Safety mechanisms suitable for ASIL D systems

  • Buck-Boost Pre-Regulator
    (Min 2.7 V input, 6 V output, integrated drivers for buck mode,
    External Drivers for Boost Mode)
  • 5 V Linear Regulator
    (400mA, Integrated Driver)
  • 5 V Tracking Regulators
    (100mA × 3 ch, Integrated Driver)
  • Safety Mechanism
    • Low-voltage detection, High-voltage detection, Overcurrent detection, Thermal shutdown
    • Window watchdog timer
    • BIST for initial diagnosis
  • SPI I/F enables reading of internal status of safety mechanisms
  • Absolute Maximum Voltage
    40V (for load dump)
  • Recommended Operating Voltage
    2.7V to 18V
  • Operating Temperature
    Ta= -40 to 125°C
  • Package: 48pin HTSSOP

This is the block diagram of TB9044FNG System Power Supply IC.

High-Efficiency DC-DC Converter + LDO Multi Power Supply IC TB9042FTG

SPI interface, Various system monitor functions, (DC-DC ×2, LDO ×3) embedded High-efficiency System Power IC

HQFN52 package

  • DC-DC Converters (SW frequency: 370 kHz)
    • DCDC1: 6 V (1.0 A) , Efficiency over 80%
    • DCDC2: 1.5 V / 1.2 V (1.0 A) output (selectable)
  • Series Power Supplies
    • LDO1: 5 V output (400 mA)
    • LDO2: 5 V output (100 mA)
  • Power Supply for Backup
    • VBU: 5 V / 3.3 V (10 mA) (selectable)
  • SPI Communication
    • Failure notification
    • MCU diagnosis
    • Low voltage detection
    • High voltage detection
  • Reset Timer
  • Power-on-reset (POR)
  • Watch-dog timer (WDT)
  • Operating temperature range: -40 to 125 °C
  • Small-sized power package: HQFN52-P-0808-0.50

This is the block diagram of High-efficiency DC/DC converter + LDO multi power IC TB9042FTG.

Lineup

System Power Supply ICs (Series Power Supplies)

Part Number Functions Output
Voltage Typ. (V)
Output
Current (mA)
Input
Voltage
Max (V)
Power
Dissipation
Max (W)
Remarks Package Supply
Voltage
(V)
Rel.
Level
TB9042FTG*

CPU voltage regulator
DC-DC converter & LDO
Watchdog timer
On-chip SPI

1.5/1.2
5
5
5/3.3

1000
400
100
10

40
(1 sec.)
5.5
  • DC/DC converter: 6V & Vreg1 output, SW frequency 370 kHz
  • 3 LDO regulators
  • Low voltage detection, POR, WDT
  • SPI interface (error infomation output, for MCU diagnosis)
HQFN52 7 to 20 AEC-Q100
Unde
consideration
TB9044FNG* CPU voltage regulator
DC-DC converter & LDO
Watchdog timer
On-chip SPI
5
5
5
5
400
100
100
100
40
(1 sec.)
3.84
  • DC-DC converter
  • Four low-dropout (LDO) regulators
  • Voltage monitor, POR, WDT
  • SPI (error information output)
  • 5-V series power supply (with a 400-mA driver)
  • 5-V tracking power supply (with three 100-mA driver channels)
HTSSOP48 2.7 to 18 AEC-Q100
Unde
consideration
Part Number Functions Output
Voltage Typ. (V)
Output
Current (mA)
Input
Voltage
Max (V)
Power
Dissipation
Max (W)
Remarks Package Supply
Voltage
(V)
Rel
Level
TB9004FNG CPU voltage regulator,
watchdog timer
3.4/2.5/1.5
5
Depends
on ext. Tr.
45
(1 sec.)
  • Two-channel system power supply IC
  • VCC1 is selectable from 3.4 V, 2.5 V and 1.5 V.
  • VCC2 = 5 V
  • WDT and low-voltage detection for each power supply
SSOP24 6 to
16
TB9005FNG CPU voltage regulator,
watchdog timer
5 Depends
on ext. Tr.
45
(1 sec.)
0.68
  • Low current consumption: 90 µA (typ.)
  • WDT OFF function
  • Reset detection 4.7 V / 4.2 V (selectable)
  • External transistor required
SSOP20 6 to 18
TB9021FNG CPU voltage regulator,
watchdog timer
5 200 50 2.8
  • Low current consumption: 30 µA (typ.)
  • WDT OFF function
  • Reset detection 4.7 V / 4.2 V (selectable)
  • Integrated output transistors
TSSOP16 6 to 18 AEC–Q100
qualified

System Power Supply ICs (DC-DC Converter Power Supply)

Part Number Functions Output
Voltage Typ. (V)
Output
Current (mA)
Input
Voltage
Max (V)
Power
Dissipation
Max (W)
Remarks Package Supply
Voltage
(V)
Rel.
Level
TB9042FTG*

CPU voltage regulator
DC-DC converter & LDO
Watchdog timer
On-chip SPI

1.5/1.2
5
5
5/3.3

1000
400
100
10

40
(1 sec.)
5.5
  • DC/DC converter: 6V & Vreg1 output, SW frequency 370 kHz
  • 3 LDO regulators
  • Low voltage detection, POR, WDT
  • SPI interface (error infomation output, for MCU diagnosis)
HQFN52 7 to 20 AEC-Q100
Unde
consideration
TB9044FNG* CPU voltage regulator
DC-DC converter & LDO
Watchdog timer
On-chip SPI
5
5
5
5
400
100
100
100
40
(1 sec.)
3.84
  • DC-DC converter
  • Four low-dropout (LDO) regulators
  • Voltage monitor, POR, WDT
  • SPI (error information output)
  • 5-V series power supply (with a 400-mA driver)
  • 5-V tracking power supply (with three 100-mA driver channels)
HTSSOP48 2.7 to 18 AEC-Q100
Unde
consideration

*: New Product, WDT: Watch-dog timer, POR: Power-on-reset

* System and product names mentioned herein may be trademarks or registered trademarks of respective companies or organizations.

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