BD2202G ROHM Co. Ltd., BD2202G Datasheet - Page 15

• Manufacturer Part Number: BD2202G
• Description: Small Current Output Power Management Switch Ics
• Manufacturer: ROHM Co. Ltd.

(10) Ground wiring pattern
(11) External capacitor
(12) Thermal shutdown circuit (TSD)
(13) Thermal design
When junction temperatures become detected temperatures or higher, the thermal shutdown circuit operates and
turns a switch OFF. The thermal shutdown circuit, which is aimed at isolating the LSI from thermal runaway as
much as possible, is not aimed at the protection or guarantee of the LSI. Therefore, do not continuously use the
LSI with this circuit operating or use the LSI assuming its operation.
Perform thermal design in which there are adequate margins by taking into account the power dissipation (Pd) in
actual states of use.
In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a
degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc.
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.
15/16