401

Regulator ICs

BA3170

(4)

Over-voltage protection circuit

exceeds about 27V (at normal temperature), the over-

voltage protection circuit switches all outputs off.

Make sure to use the IC within this voltage limit.

(5)

Capacitors to prevent oscillation of the outputs

Be certain to connect capacitors between OUT (pin 5)

and ground, and CP (pin 2) and ground to prevent oscilla-

tion. We recommend tantalum capacitors that have low

capacitance variation with temperature (particularly for

the OUT pin).

(6)

Thermal shutdown circuit

A thermal shutdown circuit is provided on the IC to pre-

vent it from being destroyed by high temperatures. When

this circuit operates, all outputs go off, and when the tem-

perature drops to a certain level, operation resumes.

(7)

Output circuit construction

(pin 6) voltage drops, even if the external capacitor on the

output side causes the output-side voltage to exceed the

(8)

Grounding

With regard to the ground connections shown in the ap-

plication example circuit, make the PCB connections

from each earth to the GND pin (pin 12) reasonably short,

and design your pattern layout to avoid electrical interfer-

ence between the pattern lines.

(9)

ASO

This IC includes a variety of protection circuits, but de-

pending on the operation conditions, it may be possible

to exceed the ASO.

Exceeding the ASO will result in destruction of the IC, so

take due care to ensure that the ASO conditions are nev-

er exceeded.

(10) Great care has been paid to the quality of this com-

ponent. However, due to the nature of lithium-ion batter-

ies, if there is a risk of danger due to failure of this compo-

nent (e.g. fire or explosion), be certain to take appropriate

measures in your design (fuses etc.).

FElectrical characteristics curves