Datasheet

© 2007 Microchip Technology Inc. DS21999B-page 11
MCP1727
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 2-19: 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
0.30
0.35
0.40
0 250 500 750 1000 1250 1500
Load Current (mA)
Dropout Voltage (V)
V
OUT
= 5.0V
V
OUT
= 2.5V
Temperature = 25°C
0.25
0.30
0.35
0.40
0.45
-45-205 305580105130
Temperature (°C)
Dropout Voltage (V)
I
OUT
= 1.5A
V
OUT
= 2.5V
V
OUT
= 5.0V
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
Short Circuit Current (A)
V
OUT
= 2.5V
Temperature = 25°
C
0.001
0.01
0.1
1
10
0.01 0.1 1 10 100 1000
Frequency (kHz)
Noise (µV/
√
Hz)
V
R
=0.8V, V
IN
=2.3V
V
R
=2.5V, V
IN
=3.3V
C
OUT
=1 μF ceramic X7R
C
IN
=10 μF ceramic
I
OUT
=200 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
=10 μF ceramic X7R
V
IN
=3.1V
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
=3.1V
C
IN
=0 μF
I
OUT
=10 mA