Data Sheet
300mA HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR
AP2125
Typical Performance Characteristics (Continued)
1000
AP2125-1.8
AP2125-2.8
C
IN = 1µF
3
COUT = 1µF
100
2
1
10
0
Stable Area
3
1
2
1
0.1
0
50
100
150
200
250
300
0
Output Current (mA)
Time (200µs/Div)
Figure 33. ESR vs. Output Current
Figure 32. Enable Input Response and Auto-discharge
(Conditions: VCE=0 to 3V, CIN=1µF,
C
OUT=1µF, VIN=3V, no load)
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
AP2125-3.3
VIN=4.3V
AP2125-1.8
VIN=2.8V
IOUT=30mA
IOUT=30mA
10
100
1k
10k
100k
10
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
Figure 34. PSRR
Figure 35. PSRR
May. 2010 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
20