BD89630EFJ(2011) データシートの表示（PDF） - ROHM Semiconductor
部品番号
コンポーネント説明
メーカー
BD89630EFJ Datasheet PDF : 4 Pages
| |||
3/3
○NOTES FOR USE
(1) Absolute Maximum Ratings
We are careful enough for quality control about this IC. So, there is no problem under normal operation, excluding that it
exceeds the absolute maximum ratings. However, this IC might be destroyed when the absolute maximum ratings, such
as impressed voltages or the operating temperature range, is exceeded, and whether the destruction is short circuit mode
or open circuit mode cannot be specified. Pleases take into consideration the physical countermeasures for safety, such
as fusing, if a particular mode that exceeds the absolute maximum rating is assumed.
(2) GND Potential
Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating
state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage except for SW,
GND terminals including an actual electric transient.
(3) Thermal design
Do not exceed the power dissipation (Pd) of the package specification rating under actual operation, and
please design enough temperature margins.
(4) Short circuit mode between terminals and wrong mounting
In order to mount the IC on a set PCB, pay thorough attention to the direction and offset of the ICs.
Erroneous mounting can destroy the IC. Furthermore, if a short circuit occurs due to foreign matters
entering between terminals or between the terminal and the power supply or the GND terminal, the IC can
destroy
(5) Operation in Strong electromagnetic field
Be noted that using the IC in the strong electromagnetic radiation can cause operation failures.
(6) ASO(Area of Safety Operation.)
Do not exceed the maximum ASO and the absolute maximum ratings of the output driver.
(7) TSD(Thermal Shut-Down) circuit
The thermal shutdown circuit (TSD circuit) is built in this product. When IC chip temperature becomes
higher, the thermal shutdown circuit operates and turns output off. The guarantee and protection of IC are
not purpose. Therefore, please do not use this IC after TSD circuit operates, nor use it for assumption that
operates the TSD circuit.
(8) GND wiring pattern
Use separate ground lines for control signals and high current power driver outputs. Because these high
current outputs that flows to the wire impedance changes the GND voltage for control signal. Therefore,
each ground terminal of IC must be connected at the one point on the set circuit board. As for GND of
external parts, it is similar to the above-mentioned.
(9) Operation in supply voltage range
Functional Circuit operation is guaranteed within operation ambient temperature, as long as it is within
operation supply voltage range. The electrical characteristics standard value cannot be guaranteed.
However, there is no drastic variation in these values, as long as it is within operation supply voltage range.
(10) We are confident in recommending the above application circuit example, but we ask that you carefully
check the characteristics of this circuit before using it. If using this circuit after modifying other external
circuit constants, be careful to ensure adequate margins for variation between external devices and this IC,
including not only static characteristics but also transient characteristics. If switching noise is high, please
insert the schottky barrier diodes between SW pin and GND pin.
(11) Overcurrent protection circuit
The overcurrent protection circuit is built in the output. If the protection circuit operates more than for
specific hours (when the load is short.), the output will be latched in OFF. The output returns when EN is
turned on or UVLO is released again. These protection circuits are effective in the destruction prevention
by broken accident. Please do not use in continuous circuit operation.
(12) Selection of inductor
It is recommended to use an inductor with a series resistance element (DCR) 0.1Ω or less. Especially, in
case output voltage is set 1.6V or more, note that use of a high DCR inductor will cause an inductor loss,
resulting in decreased output voltage. Should this condition continue for a specified period (soft start time +
timer latch time), output short circuit protection will be activated and output will be latched OFF. When
using an inductor over 0.1Ω, be careful to ensure adequate margins for variation between external devices
and this IC, including transient as well as static characteristics. Furthermore, in any case, please start up
the output with EN after supply voltage is within operation range(2.7～5.5V).
REV. B
Share Link: 