The CA3277 is a Dual 5V Voltage Regulator IC intended for microprocessor
and logic controller applications. It is supplied with features
that are commonly specified for sequentially controlled
shutdown and startup requirements of microcontrollers. Over-voltage
shutdown, short circuit current limiting and thermal shutdown
features are provided for protection in the harsh environmental applications
of industrial and automotive systems. The CA3277 functions
are complementary to the needs of microcontroller and memory circuits,
providing for sustained memory with a 5V standby output.
The Ignition Comparator senses the voltage level at the IGN IN input
and provides a 5V logic switched output (supply sourced from
OUT1). The Ignition Output, IGN OUT can be used to signal a system
microcontroller which can respond with a logic switched output
to the CA3277 ENABLE input control for OUT2. The OUT1 +5V
Standby Supply of the regulator is normally used as a power supply
for microcontroller/memory circuits to preserve stored data when in
the standby mode.To allow for maximum heat transfer from the chip,
the four center leads are directly connected to the die mounting pad.
Refer to AN9302 for further information on CA3277 circuit Applications.