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5. Design considerations
● External capacitors
A ceramic capacitor can be used as an output capacitor for the TCR15AGADJ. However, the
characteristics of some ceramic capacitors have very large temperature dependence. An output
capacitor should be carefully selected, taking the environmental conditions into account. It is also
recommended to use a ceramic capacitor with an equivalent series resistance (ESR) of 1.0Ω or
less. To ensure stable operation, use an input capacitor of 4.7μF or greater, a bias capacitor of
1.0μF or greater, and an output capacitor of 4.7μF or greater.
● Board assembly
Provide as large a GND plane as possible to reduce wire impedance. Voltage overshoot and
undershoot may happen depending on transient responses of the input and output voltage and
current, a PCB layout, and internal parasitic of an IC.
● Power dissipation
Designing PCB, the IC temperature remains well below the maximum rated temperature during
operation even at the maximum power dissipation point. For PCB design, ambient temperature,
input voltage, and output current, and other environmental conditions should also be considered.
● Overcurrent protection and thermal shutdown
The TCR15AG series has feedback loops for overcurrent protection and thermal shutdown. It
should be noted that these features are not intended to guarantee that the device is kept below
the absolute maximum ratings. Exposure to conditions exceeding the absolute maximum ratings
might adversely affect the functionality and reliability of the device. The device might be
permanently damaged if the output and GND pins of the TCR15AGADJ become partially short-
circuited.
Apply the above design considerations and derate the absolute maximum rated values as
described in the Toshiba Semiconductor Reliability Handbook to ensure that none of the absolute
maximum ratings will be exceeded under any circumstances. It is recommended to add fail-safe
and other safety features to an application system.
© 2019
Toshiba Electronic Devices & Storage Corporation
14 / 18
RD030-RGUIDE-02
2019-05-08
Rev.2
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