SNVS178G – JANUARY 2002 – REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
Unless otherwise specified, T
J
= 25°C
Output Ripple Voltage
vs
Input Voltage
(V
OUT
= 3.3V, I
OUT
= 1A, C
OUT(ESR)
= 80mΩ, C
ff
= 100pF)
80
Operating Frequency vs
Output Load Current
(L = 22µH, C
OUT(ESR)
= 45mΩ, C
ff
= 100pF)
400
OUTPUT RIPPLE VOLTAGE (mV)
L=10PH
60
L=15PH
40
L=22PH
20
OPERATING FREQUENCY (kHz)
300
12V
IN
/ 5.0V
OUT
12V
IN
/ 3.3V
OUT
200
12V
IN
/ 1.242V
OUT
4.5V
IN
/ 1.242V
OUT
100
4.5V
IN
/ 3.3V
OUT
0
0
200
400
600
800
1000
0
4
12
20
28
36
INPUT VOLTAGE (V)
OUTPUT CURRENT LOAD (mA)
Feed-Forward Capacitor (Cff) Effect
(V
OUT
= 3.3V, L = 22µH, I
OUT
= 500mA)
300
OPERATING FREQUENCY (kHz)
250
200
150
100
50
0
4
12
20
@no Cff
Ripple Voltage
@no Cff
@Cff=100p
28
50
0
36
Operating Frequency
300
250
200
150
100
OUTPUT RIPPLE VOLTAGE (mV)
@Cff=100p
INPUT VOLTAGE (V)
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