Datasheet

MCP1727
DS21999B-page 12 © 2007 Microchip Technology Inc.
NOTE: Unless otherwise indicated V
OUT
= 1.8V (Adjustable), V
IN
= 2.8V, C
OUT
= 4.7 µF Ceramic (X7R), C
IN
= 4.7 µF
Ceramic (X7R), I
OUT
= 1 mA, Temperature = +25°C, V
IN
= V
OUT
+ 0.6V, RPWRGD = 10 kΩ To V
IN
.
FIGURE 2-25: Power Supply Ripple
Rejection (PSRR) vs. Frequency (V
OUT
= 2.5V
Fixed).
FIGURE 2-26: Power Supply Ripple
Rejection (PSRR) vs. Frequency (V
OUT
= 2.5V
Fixed).
FIGURE 2-27: 2.5V (Fixed) Startup from
V
IN
.
FIGURE 2-28: 2.5V (Fixed) Startup from
Shutdown.
FIGURE 2-29: Power Good (PWRGD)
Timing with C
BYPASS
of 1000 pF.
FIGURE 2-30: Power Good (PWRGD)
Timing with C
BYPASS
of 0.1 µF.
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
R
=2.5V Fixed
C
OUT
=10 μF ceramic X7R
V
IN
=3.3V
C
IN
=0 μF
I
OUT
=10 mA
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
R
=2.5V Fixed
C
OUT
=22 μF ceramic X7R
V
IN
=3.3V
C
IN
=0 μF
I
OUT
=10 mA