R1171 Datasheet, PDF (21/24 Pages) RICOH electronics devices division – 2.0A/1.5A LDO REGULATOR

R1171x
ESR vs. Output Current (Topt=25°C, VIN=Set Output Voltage+1V, CIN=Ceramic 10μF)
VIN
CIN
CE
VOUT
R1171xxx1B
VIN
GND
COUT
ESR
IOUT
S.A ^Spectrum
Analyzer
As an output capacitor for this IC, Ceramic capacitor is recommendable. However, other low ESR type
capacitor can be used with this IC.
For your reference, noise level is tested with the circuit as shown above, and if the noise level is 40μV or less
than 40μV, the ESR values are plotted as stable area. Upper limit is described in the next four graphs, or ESR vs.
Output Current. (Hatched area is the stable area.)
R1171S151x
CIN=COUT=Ceramic 10μF
100
R1171S151x
CIN=COUT=Ceramic 4.7μF
100
10
10
1
1
0.1
0.1
0.01
0
250 500 750 1000 1250 1500
Output Current IOUT(mA)
0.01
0
250 500 750 1000 1250 1500
Output Current IOUT(mA)
21