Datasheet

© 2007 Microchip Technology Inc. DS22001C-page 13
MCP1827/MCP1827S
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, R
PWRGD
= 10 kΩ To V
IN
.
FIGURE 2-25: Power Supply Ripple
Rejection (PSRR) vs. Frequency (V
OUT
= 3.3V
Fixed).
FIGURE 2-26: Power Supply Ripple
Rejection (PSRR) vs. Frequency (V
OUT
= 3.3V
Fixed).
FIGURE 2-27: 2.5V (Adj.) Startup from V
IN
.
FIGURE 2-28: 2.5V (Adj.) Startup from
Shutdown.
FIGURE 2-29: Power Good (PWRGD)
Timing.
FIGURE 2-30: Dynamic Line Response
(3.3V Fixed).
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
R
=3.3V Fixed
C
OUT
=10 μF ceramic X7R
V
IN
=3.9V
C
IN
=0 μF
I
OUT
=10 mA
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
R
=3.3V Fixed
C
OUT
=22 μF ceramic X7R
V
IN
=3.9V
C
IN
=0 μF
I
OUT
=10 mA