S-875077CUP-ACFT2G Seiko Instruments, S-875077CUP-ACFT2G Datasheet - Page 30

• Manufacturer Part Number: S-875077CUP-ACFT2G
• Description: IC VOLT DETECT/REG 5.0V SOT89-5
• Manufacturer: Seiko Instruments

Specifications of S-875077CUP-ACFT2G

• Applications: Converter, Constant Voltage Power Supply
• Voltage - Input: 1.3 ~ 24 V
• Number Of Outputs: 1
• Voltage - Output: 5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-89-5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

30
HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
S-87x Series
5. Voltage detection circuit
The built-in voltage detection circuit (Nch opendrain type) is equivalent to our S-808 Series/S-809 Series
voltage detectors. A pull-up resistor of about 100 kΩ is required for output. Since the comparator power
of this circuit is supplied from VIN pin, this circuit operates while voltage is applied to VIN pin.
The detection voltage of the voltage detector can be selected as follows:
In the F type, the release voltage (+V
overcharge detection of lithium-ion battery packs.
In the E type, the input voltage monitoring pin of the voltage detector is externally connected as the
SENSE pin. Because this pin is configured by a resistor only, temporary current such as a through-type
current does not flow. Consequently even when resistor (R
VIN pin, the input power voltage can be accurately monitored by connecting the SENSE pin to the input
power supply. Also, when a drop in the SENSE pin input voltage is detected, the voltage detector
generates a reset signal. At the same time, it powers off the voltage regulator.
Caution 1. As shown in Figure 23 to 25, when connecting V
2.1 V to 11.3 V±2.4 % (0.1 V step)
connecting SENSE pin to VIN pin in the E type, the following phenomena occur if
resistor (R
(1) At the time of voltage detection, the voltage regulator is shutdown and load
(2) At the time of voltage release, the voltage regulator is powered on and load
current is cut. Therefore, VIN pin voltage increases by ΔV
current flowing into R
(V
necessary to set ΔV
current flows. Therefore, if ΔV
starts immediately after release and continues. It is necessary to set ΔV
than V
capacitor (C
regulator (V
Short-circuit protection circuit controls the rush current less than I
Figure 19 to 21. If this momentary oscillation is a problem in your applicaion,
setting R
HYS
IN
) is connected between input voltage and VIN pin. Be careful.
), oscillation starts immediately after detection and continues. It is
HYS
IN
. Also at the time of voltage release, the rush current to charge output
less than V
OUT
OUT
) rises high enough even though ΔV
R
) flows. Hence, oscillation momentarily starts until the output of
DET
IN
Figure 23 Attention connecting example 1
I
Seiko Instruments Inc.
IN
) accuracy is ±1.1 %. So, it responds to the application for
IN
less than V
IN
HYS
VIN
is set to I
/I
MAX
S-87xxxxCUP
prevents oscillation.
IN
VSS
exceeds hysterisis width (V
IN
HYS
. Hence, if ΔV
.
IN
) is inserted between input power supply and
VOUT
VOR
VPF
OR
output to VPF pin in the C type or
IN
exceeds hysterisis width
IN
is set less than V
R
L
IN
=I
C
HYS
OUT
IN
×R
), oscillation
IN
, where the
MAX
Rev.8.0
HYS
on
IN
. But
less
_00