S-875041CUP-ACCT2G Seiko Instruments, S-875041CUP-ACCT2G Datasheet - Page 33

• Manufacturer Part Number: S-875041CUP-ACCT2G
• Description: IC VOLT DETECT/REG 5.0V SOT89-5
• Manufacturer: Seiko Instruments

Specifications of S-875041CUP-ACCT2G

• 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

Rev.8.0
An undershoot or an overshoot may occur in the output voltage of the voltage regulator if input voltage or
load current fluctuates transiently. If an undershoot is large, the voltage detector operates to output reset
signal in the B type in which the voltage detector detects the output voltage of the regulator. If an overshoot
is large, the load circuit is adversely affected. Therefore it is important to determine the capacitor value so as
to minimize undershoot and overshoot.
1. Line: Transient characteristics due to input voltage fluctuation
Transient Characteristics
Input voltage fluctuation differs depending on the types of the signal applied: type 1 which is a rectangular
wave between (V
Figure 26 to 27) The ringing waveforms and parameter dependency of each type are described below.
The measuring circuit is shown in Figure 28 for reference.
Remark Rise/fall time (time between 10 % and 90 %) is 1 μs.
*1. AL electrolytic capacitor
HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
_00
P.G.
Input voltage
Output voltage
deviation
Fast amplifier
OUT
Figure 26 Rectangular wave between (V
+1) V and 10 V, and type 2 which is a rectangular wave from 0 V to 10 V. (Refer to
Output voltage
deviation
Input voltage
Figure 27 Rectangular wave from 0 V to 10 V (Type 2)
10 V
VIN
0 V
Figure 28 Measuring circuit
Seiko Instruments Inc.
(V
S-87x Series
OUT
+1) V
VSS
10 V
VOUT
R
O
OUT
+1) V and 10 V (Type 1)
Undershoot
Overshoot
+
−
C
L
*1
Overshoot
Undershoot
Oscilloscope
10:1 probe
S-87x Series
33