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BA44W12SAT Datasheet(PDF) 7 Page - Rohm

No. de pieza BA44W12SAT
Descripción Electrónicos  Dual output voltage regulator with power saving
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BA44W12SAT Datasheet(HTML) 7 Page - Rohm

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BA44W12SAT
Regulator ICs
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Operation notes
(1) Although the circuit examples included in this hand-book are highly recommendable for general use, you should be
thoroughly familiar with circuit characteristics as they relate to your own use conditions. If you intend to change the
number of external circuits, leave an ample margin, taking into account discrepancies in both static and dynamic
characteristics of external parts and Rohm ICs. In addition, please be advised that Rohm cannot provide complete
assurance regarding patent rights.
(2) Operating power supply voltage
When operating within the proper ranges of power supply voltage and ambient temperature, most circuit functions
are guaranteed. Although the rated values of electrical characteristics cannot be absolutely guaranteed,
characteristic values do not change drastically within the proper rages.
(3) Power dissipation (Pd)
Refer to the power dissipation characteristics in Fig.12. If power dissipation exceeds the allowable limit, the fuctionality
of the IC will be degraded (such as reduction of current capacity by increased chip temperature). Make sure to use the
IC within the allowable range of power dissipation with a sufficient margin.
(4) Preventing oscillation at each output and bypass capacitor
To stop output oscillation, make sure to connect a capacitor between GND and each output pin (capacitance of at
least 10
µF over the whole operating temperature is recommended). Oscillation can occur if capacitance is susceptible
to temperature. We recommended using a tantalum capacitor with minimal changes in capacitance. Also,
output can be further stabilized by connecting a bypass capacitor of about 0.33
µF between VCC and GND.
(5) Overcurrent protection circuit
An overcurrent protection circuit is installed in each output system, based on the respective output current. This
prevents IC destruction due to overcurrent, by limiting the current with a curve shape of “7” in the voltage-
current graph. The IC is designed with margins so that current flow will be restricted and latching will be prevented
even if a large current suddenly flows current suddenly flows through a large capacitor. Note that theses protection
circuits are only good for preventing damage from sudden accidents. Make sure your design does not case the
protection circuit to operate continuously under transitional conditions (for instance, if output is clamped at 1VF or
higher, short mode circuit operates at 1VF or lower). Note that the capacitance is negatively correlated with
temperature.
(6) Thermal protection circuit
A built-in thermal protection circuit prevents thermal damage to the IC. All outputs are turned off when the circuit
operates, and revert to the original state when the temperature drops to a certain level.
(7) We recommend installing a bypass line in your application if there is a mode where potential difference between each
output and input (VCC) or GND is reversed from the normal state. A reversed mode may cause damage to the IC.
(8) Although the quality of this IC is rigorously controlled, the IC may be destroyed when the applied voltage or the
operating temperature exceeds their absolute maximum ratings. Because short mode or open mode cannot be
specified when the IC is destroyed, be sure to take physical safety measures, such as fusing, if any of the absolute
maximum ratings might be exceeded.


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