R1173 Datasheet, PDF (8/26 Pages) RICOH electronics devices division – Super low on resistance/Low voltage LDO

R1173x
Technical Notes on External Components and Typical Application
(Refer to the example of typical application)
VIN
VDD
VOUT
C1
C2
GND
ADJ
R1173xxx
Series
CE
IOUT
VOUT
V
Example of the typical application of R1173x (Fixed Output Type)
Phase Compensation
In these ICs, phase compensation is made with the output capacitor for securing stable operation even if the
load current is varied. For this purpose, use as much as a capacitor as C2. Recommendation value is as follows:
Mounting on PCB
Make VDD and GND lines sufficient. If their impedance is high, a current flows, the noise picked up or unstable
operation may result. Further use a 4.7μF or more value capacitor between VDD pin and GND pin as close as
possible.
Set an Output capacitor between VOUT pin and GND pin for phase compensation as close as possible.
Output Voltage
VOUT<1.0V
1.0 ^<= VOUT<3.3V
3.3V ^<= VOUT
C2 recommendation value
Components Recommendation
Tantalum 4.7μF or more
Kyocera 4.7μF (1608)
Ceramic 4.7μF or more Murata 4.7μF (1608)
Murata 10μF (1608)
Part Number: CM105X5R475M06AB
Part Number: GRM188R60J475KE19B
Part Number: GRM188B30G106ME46B
Ceramic 4.7μF or more
Kyocera 4.7μF (thin 2012) Part Number: CT21X5R475M06AB
Murata 10μF (1608) Part Number: GRM188B30G106ME46B
If you use a tantalum type capacitor and ESR value of the capacitor is large, output might be unstable.
Evaluate your circuit with considering frequency characteristics.
Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature
characteristics are different. Evaluate the circuit with actual using capacitors.
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