Voltage regulator features power-on-reset & window watchdog
Toshiba has announced two 5V constant voltage regulators for use in the automotive industry. The TB9005FNG and TB9021FNG incorporate system reset functions for microcontrollers that contribute to improved safety in automotive systems. The ICs incorporate system reset functions including a window watchdog feature to aid the resetting of MCUs when an abnormal state is detected or a processor gets stuck in a loop.
Further protection is provided by an over current limiter. Both ICs are fabricated for low power consumption using Toshiba’s BiCD process.
The TB9021FNG achieves a standby current of 30μA(Typ.) It also includes an output transistor that supports 0.2A of current and helps reduce the required number of external ICs to aid system simplification. The TB9021FNG offers temperature detection and is durable against the reverse connection of VCC and GND.
Supporting 1A or higher output current, in combination with an external power transistor, the TB9005FNG is suited for use in automotive applications that require high output current. The TB9005FNG achieves a standby current of 90μA (Typ.) and includes a current limiter which is adjustable with an external resistor.
Both devices have now entered mass production.
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