BD9302FP-E Datasheet, PDF (15/17 Pages) Rohm – A wide input voltage range of 6 V to 18 V, Easy switching frequency setting in the range of 200 k to 2.5 MHz.

8) Ground wiring pattern
If small-signal GND and large-current GND are provided, It will be
recommended to separate the large-current GND pattern from the
small-signal GND pattern and establish a single ground at the reference
point of the set PCB so that resistance to the wiring pattern and voltage
fluctuations due to a large current will cause no fluctuations in voltages of
the small-signal GND. Pay attention not to cause fluctuations in the GND
wiring pattern of external parts as well.
Bypass diode
Backflow prevention diode
VCC
Output pin
9) On the application shown on the right, if the VCC and each output voltage
are inverted, for example, if the VCC is short-circuited to the Ground with
external diode charged, internal circuits or elements may be damaged. To
avoid that, use the output pin capacitor in the range of 10 to 100 μF.
Furthermore, in order to use a capacitor of 100 μF or more, it is
recommended to insert a backflow prevention diode or a bypass diode
between the output and VCC.
Fig.36 Typical bypass diode application
10) Overcurrent protection circuit
Output has a built-in overcurrent protection circuit according to the current capability, which prevents the destruction of
the IC at short-circuiting of load. However, this protection circuit is only effective to prevent destruction due to a sudden
accident but does not support for the continuous operation of the protection circuit or use in transition. Furthermore,
since the current capability has characteristic negative to temperature, give consideration to the thermal design.
11) Temperature protection circuit
This IC has a built-in temperature protection circuit to prevent the thermal destruction of the IC. As described above, be
sure to use this IC within the power dissipation range. Should a condition exceeding the power dissipation range
continues, the chip temperature Tj will rise to activate the temperature protection circuit, thus turning OFF the output
power element. Then, when the tip temperature Tj falls, the circuit will be automatically reset.
Furthermore, since the temperature protection circuit is activated under the condition exceeding the absolute maximum
ratings, NEVER attempt to use the temperature protection circuit for set design or else.
12) Input capacitor
In order to derate a peak noise, which occurs while in switching operation, be sure to insert a capacitor (ceramic
capacitor) having a low ESR of 10 to 100 μF as close to the pin as possible between the VCC and Ground.
Power dissipation
1500
1250
1000
750
500
250
0
0
25
50
75
100
125
150
Ambient temperature : Ta [˚C]
Fig.37 Thermal derating characteristics
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