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BA3933

Rohm
Part Number BA3933
Manufacturer Rohm
Description Reference voltage power supply
Published Apr 1, 2005
Detailed Description Regulator ICs Reference voltage power supply BA3933 The BA3933 is a monolithic reference voltage power supply IC for us...
Datasheet PDF File BA3933 PDF File

BA3933
BA3933

Overview
Regulator ICs Reference voltage power supply BA3933 The BA3933 is a monolithic reference voltage power supply IC for use in CD radio cassette players.
FApplications CD radio cassette players, mini-component stereo audio systems FFeatures 1) With 7.
5V output for audio power supply, 5V output for microcontrollers, 5V output for radio 5 and 7.
5V outputs for CD players, 9V output for motor drivers, the IC is best suited for CD radio cassette players.
2) Precise power supply (5V ± 0.
1V) can be obtained by using external reference voltage input (only AUDIO output has an internal reference voltage system).
3) Zero standby current.
(Typ.
) 4) Output current limit circuit protects the IC against short-circuiting damage.
5) Compact SIP-M12 package allows a large power dissipation (3W: no heat sink).
6) Thermal protection circuit prevents heat damage to the IC.
FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Topr = 25_C) 160 Regulator ICs FBlock diagram BA3933 FPin descriptions 161 Regulator ICs FInput / output circuits BA3933 162 Regulator ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 16.
0V) BA3933 163 Regulator ICs BA3933 FCircuit operation (1) Timing chart (2) Estimate of allowable power dissipation Except under transitional conditions, the power dissipation of this IC is 3W per unit at 25_C.
See Fig.
1 for thermal derating characteristics, including some cases where heat sinks are used.
FThermal derating characteristics AUDIO 7.
5V, MOTOR 9V, and COM 5V are output regardless of MODE SW.
RADIO 5V rises when MODE SW is 1.
4V (typical), and CD 5V rises when MODE SW is 3.
2V (typical).
164 Regulator ICs BA3933 Calculation of PMAX S Power consumed by AUDIO 7.
5V P1 = (VCC * 7.
5V) I1 S Power consumed by MOTOR 9V P2 = (VCC * 9V) I2 S Power consumed by CD 7.
5V P3 = (VCC * 7.
5V) I3 S Power consumed by CD 5.
0V P4 = (VCC * 5V) I4 S Power consumed by RADIO 5.
0V P5 = (VCC * 5V) I5 S Power consumed by COM 5.
0V P6 ...


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