S-87X_1 Datasheet, PDF (31/53 Pages) Seiko Instruments Inc – HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION

HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.7.2_00
S-87x Series
I_IN
R_IN
VIN
VOUT
S-87xxxxEUP _VOR
SENSE
VSS
R_{L COUT}
Power Voltage
Figure 24 Attention connecting example 2
V_IN Voltage
+V_DET
−V_DET
ΔV_IN
V_HYS
A drop in V_IN due to
rush current
V_OR
Figure 25 When ΔV_IN>V_HYS
2. In the E type, the minimum operating voltage becomes 2.0 V as V_IN voltage. If a drop
in V_IN voltage occurs due to load current or rush current to be charged to the output
capacitor when load current or the voltage regulator is powered on at the time of
release, set V_IN to 2.0 V or more.
3. Also, in the E type, when sharply increasing only VIN pin voltage at 1 ms/V or less,
with the SENSE pin fixed to −V_DET≥V_SENSE≥−V_DET−2 V, a release pulse is output to the
output pin of voltage detector. Be careful. In this case, this release pulse is removed
by setting the time constant of VOR pin 20 ms or more with capacitance and pull-up
resistance. In addition, when the voltage of SENSE pin is fixed to between the
detection voltage and the release voltage at the detect condition, if sharply increasing
only VIN pin voltage at 1 ms/V or less, the output of the detector turns to the release
condition. If this action is a problem in your system, please connect SENSE pin to
VIN pin.
Seiko Instruments Inc.
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