Toshiba TCR15AG Series, Reference Manual

Page: 11 / 18

RD030-RGUIDE-02
2019-05-08
Rev.2
11 / 18
© 2019
Toshiba Electronic Devices & Storage Corporation
adversely lacking the operation or performance of the entire system. The fast load transient response
and the ability to provide a low output voltage make the TCR15AG series suits a power supply for
high-speed digital signal processing applications, including SoCs and the digital core (control) of
CMOS image sensors. Figure 3.7 shows examples of load transient response waveforms of the
TCR15AG12
(V
OUT
=1.2V).
Figure 3.7 Example of load transient response waveforms
The left-side image shows the output voltage waveform in response to a change in the load current
from 10mA to 1.5A. The right -side image shows the waveform in response to a load current change
from 1.5 A to 10 mA. For example, the load current changes rapidly in case of the digital core of a
CMOS image sensor transitions from an idle state to an active mode or in case of a memory device
performs a burst transfer at high speed. The load transient responses of the TCR15AG series shown
in Figure 3.3.2 are the results of measurement under more severe conditions than these cases. As
described in the previous section, a high- performance error amplifier integrated in the TCR15AG
series makes it possible to maintain a regulated output voltage even in the event of sudden change
in the load current. In fact, LDO regulators are seldom exposed to load current changes as rapid as
those shown in Figure 3. 7. Therefore, the TCR15AG series provides a sufficient design margin even
for systems sensitive to power supply swing.
C
IN
= 4.7μF
C
OUT
= 4.7μF
C
BIAS
= 1μF
V
IN
= 3.3V
V
CT
= 1.5V
V
BIAS
= 3.3V
I
OUT
= 10mA → 1.5A → 10mA