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HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR - Seiko Instruments

Número de pieza S-1155
Descripción HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
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S-1155 datasheet

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S-1155 pdf
Rev.1.1_00
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1155 Series
„ Pin Configuration
SOT-89-5
www.datasheet4u.comTop view
54
12 3
Figure 2
Table 2
Pin No.
Symbol
Description
1 ON/OFF Shutdown pin
2
VSS
GND pin
3
NC*1
No connection
4 VIN Input voltage pin
5
VOUT
Output voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
Seiko Instruments Inc.
5

5 Page

S-1155 arduino
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1155 Series
„ Standard Circuit
www.datasheet4u.com
Input
CIN*1
VIN VOUT
ON/OFF
VSS
Output
CL*2
Rev.1.1_00
Single GND
GND
*1. CIN is a capacitor for stabilizing the input.
*2. Ceramic capacitor of 4.7 µF or more can be used as CL.
Figure 9
Caution The above connection diagram and constant will not guarantee successful operation. Perform
thorough evaluation using the actual application to set the constant.
„ Application Conditions
Input capacitor (CIN) : 4.7 µF or more
Output capacitor (CL) : 4.7 µF or more (ceramic capacitor)
Caution
1. Set input capacitor (CIN) and output capacitor (CL) as CIN = CL.
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.
„ Selection of Input and Output Capacitors (CIN, CL)
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 (CIN) and output capacitor (CL) as follows.
CIN 4.7 µF
CL 4.7 µF
CIN = CL
Caution
The S-1155 Series may oscillate if setting the value as CIN 4.7 µF, CL 4.7 µF, CIN < CL.
Define the values by sufficient evaluation including the temperature characteristics under the usage
condition.
10 Seiko Instruments Inc.

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