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BA3960 Datasheet(PDF) 5 Page - Rohm

Part No. BA3960
Description  Dual circuit, variable output voltage regulator
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BA3960 Datasheet(HTML) 5 Page - Rohm

   
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140
Regulator ICs
BA3960
FOperation notes
(1)
Operating power supply voltage
When operating within 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, char-
acteristic values do not change drastically within the
proper ranges.
(2)
Power dissipation (Pd)
Refer to the heat reduction characteristics (Fig. 5) and
the rough estimation of IC power dissipation presented
on a separate page. If power dissipation exceeds the al-
lowable limit, the functionality of IC will be degraded
(such as reduction of current capacity by increased chip
temperature). Make sure to use the IC within the allow-
able range of power dissipation with a sufficient margin.
(3)
Preventing oscillation at each output
To stop oscillation of output, make sure to connect a ca-
pacitor having a capacitance of 10
µF or greater between
GND and each of the Active 1 and 2 output pins. Oscilla-
tion can occur if capacitance is susceptible to tempera-
ture. We recommend using a tantalum electrolytic capac-
itor with minimal changes in capacitance. Also, output
can be further stabilized by connecting a bypass capaci-
tor between VCC and GND.
(4)
Overcurrent protection circuit
An overcurrent protection circuit is installed on the Active
1 and 2 outputs, based on the respective current capac-
ity. This prevents IC destruction when the load is short-
circuited, 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
through a large capacitor. Note that these protection cir-
cuits are only good for preventing damage from sudden
accidents. Make sure your design does not cause the
protection circuit to operate continuously under transi-
tional conditions (for instance, if output is clamped at 1VF
or higher, short mode circuit operates at 1VF or lower).
Note that the circuit ability is negatively correlated with
temperature.
(5)
Thermal protection circuit
A built-in thermal protection circuit prevents thermal
damage to the IC. All outputs are switched OFF when the
circuit operates, and revert to the original state when
temperature drops to a certain level.
(6)
Grounding
To minimize the variation of output voltage due to varia-
tions in load current, the GND (pin 1, for large current)
and the PRE GND (pin 3, for small current) pins are sepa-
rately provided. Make sure to connect circuits to correct
pins.
(7)
Output voltage setting
ROHM recommends using a 3.9k
Ω resistor for R12 and
R22. Refer to a separate page for the output voltage set-
ting. Note that making a large change to the R12 and R22
values will affect the current capacity.
(8)
MODE voltage
Due to the IC’s internal structure, a reverse current flow
will occur if the MODE voltage exceeds the VCC voltage.
Make sure to avoid this.
FExternal dimensions (Units: mm)


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