BU2JTH5WNVX Datasheet, PDF (9/13 Pages) Rohm – High Ripple Rejection, Low Current Consumption, Versatile Package FULL CMOS LDO Regulator

BU2JTH5WNVX
Datasheet
Operational Notes – continued
11. Unused Input Pins
Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and
extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small charge
acquired in this way is enough to produce a significant effect on the conduction through the transistor and cause
unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the power
supply or ground line.
12. Regarding the Input Pin of the IC
In the construction of this IC, P-N junctions are inevitably formed creating parasitic diodes or transistors. The operation
of these parasitic elements can result in mutual interference among circuits, operational faults, or physical damage.
Therefore, conditions which cause these parasitic elements to operate, such as applying a voltage to an input pin lower
than the ground voltage should be avoided. Furthermore, do not apply a voltage to the input pins when no power
supply voltage is applied to the IC. Even if the power supply voltage is applied, make sure that the input pins have
voltages within the values specified in the electrical characteristics of this IC.
13. Voltage of CE pin
To enable standby mode for all channels, set the CE pin to 0.3 V or less, and for normal operation, to 1.2 V or more.
Setting CE to a voltage between 0.3 and 1.2 V may cause malfunction and should be avoided. Keep transition time
between high and low (or vice versa) to a minimum.
Additionally, if CE is shorted to VIN, the IC will switch to standby mode and disable the output discharge circuit, causing
a temporary voltage to remain on the output pin. If the IC is switched on again while this voltage is present,
overshoot may occur on the output. Therefore, in applications where these pins are shorted, the output should always
be completely discharged before turning the IC on.
14. Ceramic Capacitor
When using a ceramic capacitor, determine the dielectric constant considering the change of capacitance with
temperature and the decrease in nominal capacitance due to DC bias and others.
15. Area of Safe Operation (ASO)
Operate the IC such that the output voltage, output current, and power dissipation are all within the Area of Safe
Operation (ASO).
16. Over Current Protection Circuit (OCP)
This IC incorporates an integrated overcurrent protection circuit that is activated when the load is shorted. This
protection circuit is effective in preventing damage due to sudden and unexpected incidents. However, the IC should
not be used in applications characterized by continuous operation or transitioning of the protection circuit.
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TSZ22111・15・001
9/10
TSZ02201-0RBR0A300190-1-2
07.Jan.2014.Rev.001