RT9172
Typical Operating Charateristics
0
-10
-20
Preliminary
PSRR
C
IN
= 1nF
C
OUT
= 10µF Electrolytic Capacitor
V
IN
= 5V
V
OUT
= 2.5V
T
A
= 25°C
0
-10
-20
PSRR
C
IN
= 1nF
C
OUT
= 68µF Tantalum Capacitor
V
IN
= 5V
V
OUT
= 2.5V
T
A
= 25°C
PSRR (dB)
-30
-40
-50
-60
-70
PSRR (dB)
-30
-40
-50
-60
10mA
100mA
10mA
100mA
10
100
1K
10K
100K
1M
-70
10
100
1K
10K
100K
1M
Frequency (Hz)
Frequency (Hz)
Noise Signal & Spectrum Distribution
Time (mS)
Noise Level (uV) Noise Signal (uV)
200
1500
160
500
120
-500
80
40
0
0
25
50
75
100
125
Noise Signal & Spectrum Distribution
Noise Signal (uV)
0
200
1000
160
0
2
0
2
4
6
8
10
Time (mS)
4
6
8
10
Noise Level (uV)
≈
-1000
120
80
40
0
≈
C
IN
= 1µF
C
OUT
= 10µF Tantalum Capacitor
Load = 100mA
Sampling Rate = 250KHz
C
IN
= 1µF
C
OUT
= 10µF Tantalum Capacitor
Load = 10mA
Sampling Rate = 250KHz
0
25
Frequency (KHz)
Frequency (KHz)
50
75
100
125
Noise Signal & Spectrum Distribution
Noise Signal (uV)
Noise Signal (uV)
0
200
1000
0
160
-1000
120
80
40
0
0
25
2
Noise Signal & Spectrum Distribution
0
200
1000
0
160
-1000
120
80
40
0
0
25
50
75
100
125
2
Time (mS)
4
6
8
10
Time (mS)
4
6
8
10
≈
Noise Level (uV)
Frequency (KHz)
50
75
100
125
Noise Level (uV)
C
IN
= 1µF
C
OUT
= 68µF Tantalum Capacitor
Load = 10mA
Sampling Rate = 250KHz
≈
C
IN
= 1µF
C
OUT
= 68µF Tantalum Capacitor
Load = 100mA
Sampling Rate = 250KHz
Frequency (KHz)
www.richtek-ic.com.tw
DS9172-03 April 2002
6
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
