S-1701A2728-M5T1G SII [Seiko Instruments Inc], S-1701A2728-M5T1G Datasheet - Page 38

• Manufacturer Part Number: S-1701A2728-M5T1G
• Description: HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
• Manufacturer: SII [Seiko Instruments Inc]

38
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
S-1701 Series
5. Oscillation
6. Other characteristics
6. 1 Temperature characteristics of detection voltage
In applications where a resistor is connected to the input side (Figure 32), the through-type current
which is generated when the output goes from low to high (release) causes a voltage drop equal to
[through-type current] × [input resistance] across the resistor. When the input voltage drops below
the detection voltage as a result, the output voltage goes from high to low. In this state, the through-
type current stops, its resultant voltage drop disappears, and the output goes from low to high. The
through-type current is then generated again, a voltage drop appears, and repeating the process
finally induces oscillation.
The shaded area in Figure 33 is the range where V
when the temperature coefficient of the output voltage is ±140 ppm/°C.
Figure 32 Example of Bad Implementation of Detection Voltage Changer
Figure 33 Detection Voltage Temperature Characteristics
−V
3.000
VSS
VIN
DET
[V]
Example of products with −V
−40
Seiko Instruments Inc.
R
R
a
b
V
IN
detector
S-1701
25
block
OUT
varies within the operating temperature range
DET
85
= 3.0 V
+0.42 mV/°C
−0.42 mV/°C
VDOUT
Ta [°C]
Rev.2.4
_00