Datasheet

INPUT VOLTAGE (V)
OPERATING FREQUENCY (kHz)
OUTPUT RIPPLE VOLTAGE (mV)
0
50
100
150
200
250
300
4 12 20 28 36
0
50
100
150
200
250
300
@Cff=100p
@no Cff
@no Cff
@Cff=100p
Ripple Voltage
Operating Frequency
0
20
40
60
80
4
12 20 28 36
INPUT VOLTAGE (V)
OUTPUT RIPPLE VOLTAGE (mV)
L=10PH
L=15PH
L=22PH
400
OUTPUT CURRENT LOAD (mA)
OPERATING FREQUENCY (kHz)
12V
IN
/ 3.3V
OUT
4.5V
IN
/ 1.242V
OUT
12V
IN
/ 1.242V
OUT
4.5V
IN
/ 3.3V
OUT
12V
IN
/ 5.0V
OUT
300
200
100
0
2000 400 600 800 1000
LM3485
www.ti.com SNVS178G –JANUARY 2002–REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
Unless otherwise specified, T
J
= 25°C
Output Ripple Voltage
vs Operating Frequency vs
Input Voltage Output Load Current
(V
OUT
= 3.3V, I
OUT
= 1A, C
OUT(ESR)
= 80mΩ, C
ff
= 100pF) (L = 22µH, C
OUT(ESR)
= 45mΩ, C
ff
= 100pF)
Feed-Forward Capacitor (Cff) Effect
(V
OUT
= 3.3V, L = 22µH, I
OUT
= 500mA)
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