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○Cautions on use
(1) Absolute Maximum Ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break
down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any special mode
exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the
use of fuses, etc.
(2) Power supply and GND line
Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. Pay attention to the
interference by common impedance of layout pattern when there are plural power supplies and GND lines. Especially, when
there are GND pattern for small signal and GND pattern for large current included the external circuits, please separate each
GND pattern. Furthermore, for all power supply terminals to LSI, mount a capacitor between the power supply and the GND
terminal. At the same time, in order to use a capacitor, thoroughly check to be sure the characteristics of the capacitor to be used
present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant.
(3) GND voltage
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 including an actual electric transient. ( except for VDD4
terminal )
(4) Short circuit between terminals and erroneous mounting
In order to mount LSI on a set PCB, pay thorough attention to the direction and offset of the LSI. Erroneous mounting can break
down the LSI. 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 LSI can break down.
(5) Operation in strong electromagnetic field
Be noted that using LSI in the strong electromagnetic field can malfunction them.
(6) Input terminals
In terms of the construction of LSI, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic
element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal.
Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the
GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to the input terminals when no
power supply voltage is applied to the LSI. In addition, even if the power supply voltage is applied, apply to the input terminals a
voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics.
(7) External capacitor
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.
(8) Thermal shutdown circuit (TSD)
This LSI builds in a thermal shutdown (TSD) circuit. When junction temperatures become detection temperature 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.
(9) Thermal design
Perform thermal design in which there are adequate margins by taking into account the permissible dissipation (Pd) in actual
states of use.
(10) LDO
Use each output of LDO by the independence. Don’t use under the condition that each output is short-circuited because it
has the possibility that a operation becomes unstable.
(11) DC/DC converter
Please select the low DCR inductors to decrease power loss for DC/DC converter.
(12) About the pin for the test, the un-use pin
Prevent a problem from being in the pin for the test and the un-use pin under the state of actual use. Please refer to a
function manual and an application notebook.
And, as for the pin that doesn't specially have an explanation, ask our company person in charge.
(13) About the rush current
For ICs with more than one power supply, it is possible that rush current may flow instantaneously due to the internal
powering sequence and delays. Therefore, give special consideration to power coupling capacitance, power wiring, width of
ground wiring, and routing of wiring.
(14) About the function description or application note or more.
The function description and the application notebook are the design materials to design a set. So, the contents of the
materials aren't always guaranteed. Please design application by having fully examination and evaluation include the
external elements.
REV. A
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