R1170X Datasheet, PDF (15/16 Pages) RICOH electronics devices division – 800mA LDO REGULATOR

3.5
3.4
3.3
3.2
3.1
3
2.9
0
R1170X301B tr=tf=3us
CIN = Ceramic 10uF
VIN=4V
COUT =Ceramic 10uF
120
100
80
Output Current
60
Output Voltage
40
20
0
20
40
60
80
100
120
140
160
180
200
Time t(us)
R1170X301B tr=tf=3us
CIN = Ceramic 10uF
VIN=4V
COUT =Ceramic 4.7uF
3.5
3.4
3.3
Output Current
3.2
3.1
Output Voltage
3
2.9
0
20
40
60
80
100
120
140
160
180
Time t(us)
12)Stable Area(Topt=25°C,VIN=Set Output Voltage+1V,CIN=Ceramic 10µF)
Vin
Ceramic
Capacitor
CE
Vout
R1170XXXXB
VIN
GND
Ceramic
Capacitor
ESR
IIout
Spectrum
S.A. _Analyzer
120
100
80
60
40
20
0
200
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.)
Rev. 1.10
-15-