ba3918.pdf

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Regulator ICs
System power supply for car stereos
BA3918
The BA3918 is a single-chip power supply IC for use in car audio systems. One 5.6V output for a microcontroller, three
8.7V outputs, and two outputs interlocked by BACKUP and ACC systems are built in.
Applications
Car audio systems
Features
1) All outputs except AMP and ANT use a PNP transis-
tor with a low saturation voltage.
2) Output current limit circuit prevents damage to the IC
due to short-circuiting.
3) Overvoltage protection circuit provides protection
against surges from the A CC or BACKUP input.
4) Compact 12-pin POWER package allows large pow-
er dissipation.
5) Thermal protection circuit prevents heat damage to
the IC.
Block diagram
242
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Regulator ICs
BA3918
Absolute maximum ratings (Ta = 25
C)
Recommended operating conditions (Ta = 25
C)
Pin descriptions
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Regulator ICs
BA3918
Input / output circuits
244
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Regulator ICs
BA3918
Electrical characteristics (unless otherwise noted, Ta = 25
C and V CC = 13.2V)
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Regulator ICs
BA3918
Input / output timing chart
246
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