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R1173H421B Datasheet(PDF) 8 Page - RICOH electronics devices division

Part # R1173H421B
Description  Super low on resistance/Low voltage LDO
Download  33 Pages
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

R1173H421B Datasheet(HTML) 8 Page - RICOH electronics devices division

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R1173x
8
Technical Notes on Output Voltage Setting of Adjustable Output type
(R1173x001x)
GND
ADJ
RIC
R3
IIC
I2
I3
R2
1.0V
VOUT
VOUT
The Output Voltage may be adjustable for any output voltage between its 1.0V reference and its VDD setting
level. An external pair of resistors is required, as shown above.
The complete equation for the output voltage is described step by step as follows;
I2
=IIC+I3 .....................................................................................................................................(1)
I3
=1.0/R3...................................................................................................................................(2)
Thus,
I2
=IIC+1.0/R3..............................................................................................................................(3)
Therefore,
VOUT
=1.0+R2×I2.........................................................................................................................(4)
Put Equation (3) into Equation (4), then
VOUT
=1.0+R2(IIC+1.0/R3)
=1.0(1+R2/R3)+R2×IIC........................................................................................................(5)
In 2nd term, or R2
×IIC will produce an error in VOUT.
In Equation (5),
IIC
=1.0/RIC ..................................................................................................................................(6)
R2
×IIC=R2×1.0/RIC
=1.0×R2/RIC .....................................................................................................................(7)
For better accuracy, choosing R2 (<<RIC) reduces this error.
R1173x001x
0.8
1.4
1.2
1.0
2.0
1.8
1.6
-50
-25
25
75
50
0
100
Temperature Topt (
°C)
∗) The graph is a typical
characteristic , please
evaluate the circuit with
an actual condition.


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