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S-1172B42-U5T1G Datasheet(PDF) 11 Page - Seiko Instruments Inc

No. de pieza S-1172B42-U5T1G
Descripción Electrónicos  HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
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Fabricante Electrónico  SII [Seiko Instruments Inc]
Página de inicio  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

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HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.1.1_00
S-1172 Series
Seiko Instruments Inc.
11
Standard Circuit
CIN
*1
CL
*2
Input
Output
GND
Single GND
VOUT
VIN
VSS
ON/OFF
*1. CIN is a capacitor for stabilizing the input.
*2. Ceramic capacitor of 4.7
µF or more can be used as CL.
Figure 11
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-1172 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-1172 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.


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