S-1155 Seiko Instruments, S-1155 Datasheet - Page 10

• Manufacturer Part Number: S-1155
• Description: HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
• Manufacturer: Seiko Instruments

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10
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1155 Series
Standard Circuit
Application Conditions
Selection of Input and Output Capacitors (C
Caution
Input capacitor (C
Output capacitor (C
Caution
The S-1155 Series requires an output capacitor between the VOUT and VSS pin for phase compensation. Operation
is stabilized by a ceramic capacitor with an output capacitance of 4.7 µF or more over the entire temperature range.
When using an OS capacitor, a tantalum capacitor, or an aluminum electrolytic capacitor, the capacitance must be 4.7
µF or more.
The values of output overshoot and undershoot, which are transient response characteristics, vary depending on the
value of output capacitor.
The required value of capacitance for the input capacitor differs depending on the application.
Set the value for input capacitor (C
C
C
C
Caution The S-1155 Series may oscillate if setting the value as C
IN
L
IN
≥ 4.7 µF
≥ 4.7 µF
= C
L
Define the values by sufficient evaluation including the temperature characteristics under the usage
condition.
The above connection diagram and constant will not guarantee successful operation. Perform
thorough evaluation using the actual application to set the constant.
1. Set input capacitor (C
2. Generally, series regulator may oscillate depending on the external components. Confirm that
no oscillation occurs in the application for which the above capacitors are used.
IN
) :
L
) :
4.7 µF or more
4.7 µF or more (ceramic capacitor)
Input
C
*1. C
*2. Ceramic capacitor of 4.7 µF or more can be used as C
IN
IN
) and output capacitor (C
*1
IN
) and output capacitor (C
IN
is a capacitor for stabilizing the input.
Single GND
Seiko Instruments Inc.
VIN
ON/OFF
Figure 9
VSS
VOUT
IN
L
) as follows.
, C
L
L
) as C
)
IN
≥ 4.7 µF, C
IN
GND
C
= C
Output
L
*2
L
.
L
≥ 4.7 µF, C
L
.
IN
< C
L
.
Rev.1.1
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