Datasheet

© 2007 Microchip Technology Inc. DS22026B-page 11
MCP1725
Note: Unless otherwise indicated, V
IN
= V
OUT
+ 0.5V or V
IN
= 2.3V (whichever is greater), I
OUT
= 1 mA,
C
IN
= C
OUT
= 4.7 µF Ceramic (X7R), SHDN = V
IN
, C
DELAY
= Open, Fixed Output Version, and T
A
= +25°C.
FIGURE 2-19: Dropout Voltage vs. Load
Current.
FIGURE 2-20: Dropout Voltage vs.
Temperature.
FIGURE 2-21: Short Circuit Current vs.
Input Voltage.
FIGURE 2-22: Output Noise Voltage
Density vs. Frequency.
FIGURE 2-23: Power Supply Ripple
Rejection (PSRR) vs. Frequency (V
OUT
= 1.2V
Adj.).
FIGURE 2-24: Power Supply Ripple
Rejection (PSRR) vs. Frequency (V
OUT
= 1.2V
Adj.).
0.00
0.05
0.10
0.15
0.20
0.25
0 100 200 300 400 500
Load Current (mA)
Dropout Voltage (V)
V
OUT
= 5.0V
V
OUT
= 2.5V
0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
-45 -20 5 30 55 80 105 130
Temperature (°C)
Dropout Voltage (V)
V
OUT
= 5.0V
V
OUT
= 2.5V
I
LOAD
= 500 mA
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
3.03.54.04.55.05.56.0
Input Voltage (V)
Short Circuit Current (A)
I
STEADY STATE
I
PEAK
V
OUT
= 2.5V Fixed
C
IN
= 3000 µF
0.001
0.01
0.1
1
10
0.01 0.1 1 10 100 1000
Frequency (kHz)
Noise (μV/¥Hz)
V
IN
= 3.3V
V
OUT
= 2.5V
V
IN
= 2.3V
V
OUT
= 0.8V
I
LOAD
= 200 mA
C
OUT
= 1 μF
C
IN
= 10 μF
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
R
=1.2V Adj
C
OUT
=4.7 μF ceramic X7R
V
IN
=2.5V
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
=1.2V Adj
C
OUT
=22 μF ceramic X7R
V
IN
=2.5V
C
IN
=0 μF
I
OUT
=10 mA