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BA3918

Rohm
Part Number BA3918
Manufacturer Rohm
Description System power supply for car stereos
Published Apr 1, 2005
Detailed Description Regulator ICs System power supply for car stereos BA3918 The BA3918 is a single-chip power supply IC for use in car aud...
Datasheet PDF File BA3918 PDF File

BA3918
BA3918

Overview
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.
FApplications Car audio systems FFeatures 1) All outputs except AMP and ANT use a PNP transistor 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 ACC or BACKUP input.
4) Compact 12-pin POWER package allows large power dissipation.
5) Thermal protection circuit prevents heat damage to the IC.
FBlock diagram 242 Regulator ICs FAbsolute maximum ratings (Ta = 25_C) BA3918 FRecommended operating conditions (Ta = 25_C) FPin descriptions 243 Regulator ICs FInput / output circuits BA3918 244 Regulator ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 13.
2V) BA3918 245 Regulator ICs BA3918 FInput / output timing chart 246 Regulator ICs FEstimate of allowable power dissipation Except under transitional conditions, the power dissipation of this IC is 3W per unit at 25_C.
See Fig.
4 for thermal derating characteristics, including some cases where heat sinks are used.
BA3918 A = maximum voltage for VCC I1 = maximum output current for VDD I2 = maximum output current for COM I3 = maximum output current for AMP I4 = maximum output current for ANT I5 = maximum output current for AM I6 = maximum output current for FM S Power consumed by VDD 5.
6V S Power consumed by COM 8.
7V S Power consumed by AMP S Power consumed by ANT S Power consumed by AM 8.
7V S Power consumed by FM 8.
7V S Power consumed internally by each circuit P1 = (A * 5.
6V) I1 ) (I1 / 20 ) I1 / 10) I2 ) (I2 / 30 ) I2 / 10) P2 = (A * 8.
7V) P3 = 1V I3 ) (22mA) A I4 ) (22mA) A P4 = 1V I5 ) (I5 / 30 ) I5 / 10) P5 = (A * 8.
7V) I6 ) (I2 / 50 ) I6 / 10) P6 = (A * 8.
7V) circuit current (...


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