BD8174MUV Datasheet, PDF (31/42 Pages) Rohm – Output voltage fixed-type Multi-channel System Power Supply IC

BD8174MUV
・ Buffer output setting
The relation between buffer output voltage (OUT0 to OUT3) and DAC setting value is shown below.
Output voltage (OUT0 to OUT3)  ^{DAC setting value 1}  HVLDO
1024
Buffer output terminals OUT0 to OUT3 output after UVLO release of HVCC.
While UVLO detection, the output is HiZ.
(8)
Common block
(8.1)
UVLO function
When VCC is below 8.0V(TYP), UVLO function activates and be canceled when VCC is over 8.4V(TYP).
(8.2)
SCP function
SCP
CSCP
5uA
1.5V
LATCH
Figure 42. SCP
The SCP function protects against short-circuits in the outputs of the step-up DC/DC converter, step-down DC/DC
converter, HV_LDO, LV_LDO and charge pump blocks. When any one of these outputs falls below 60% of the set
voltage, it will be regarded as a short-circuit in output, thus activating the short-circuit protection function.
If a short-circuit is detected, source current of 5 μA (Typ) will be output from the SCP pin. Then, delay time will be set
with external capacitance. When the SCP pin voltage exceeds 1.5V (Typ), the state will be latched to shut down all
outputs. Once the state has been latched, it will not be canceled unless VCC restarts. The delay time setting is
obtained by using the following equation.
TL[s]

C_SCP 1.5
5 10^6
Even if none of the output startup sequences is complete at startup of the IC, short-circuits will be detected and the
SCP function activated. For this reason, set the delay time substantially longer than the startup time.
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TSZ02201-0313AAZ00670-1-2
17.Feb.2016 Rev.001