9/10

07.Jan.2014.Rev.001

TSZ02201-0RBR0A300190-1-2

www.rohm.com

© 2013 ROHM Co., Ltd. All rights reserved.

TSZ22111・15・001

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.