Datasheet

0
200
400
600
800
4
12 20 28 36
INPUT VOLTAGE (V)
OPERATING FREQUENCY (KHz)
L=10PH
L=15PH
L=22PH
Inductor Current
SW node
Voltage
Output Ripple Voltage
TIME (5Ps/div)
0A
0.5A
0V
5V
10V
0mV
20mV
-20mV
0A
0.5A
0V
5V
10V
0mV
20mV
-20mV
1A
Inductor Current
SW node Voltage
Output Ripple Voltage
TIME (2Ps/div)
(1A/div)
(2V/div)
lind@C
ADJ
= 10nF
lind@C
ADJ
= 1nF
V
OUT
@C
ADJ
= 10nF
V
OUT
@C
ADJ
= 1nF
(2V/div)
V
IN
(10V/div)
TIME (100Ps/div)
40
50
60
70
80
90
100
10 100 1000 10000
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 12V
V
IN
= 24V
EFFICIENCY (%)
40
50
60
70
80
90
100
LOAD CURRENT (mA)
10 100 1000 10000
V
IN
= 12V
V
IN
= 4.5V
V
IN
= 24V
LM3485
SNVS178G –JANUARY 2002–REVISED FEBRUARY 2013 www.ti.com
Typical Performance Characteristics (continued)
Unless otherwise specified, T
J
= 25°C
Efficiency vs Efficiency vs
Load Current Load Current
(V
OUT
= 3.3V, L = 22µH) (V
OUT
= 5.0V, L = 22µH)
Continuous Mode Operation
Start Up (V
IN
= 12V, V
OUT
= 3.3 V, I
OUT
= 500mA, L = 22µH)
Operating Frequency
vs
Discontinuous Mode Operation Input Voltage
(V
IN
= 12V, V
OUT
=3.3 V, I
OUT
= 50mA, L = 22µH) (V
OUT
= 3.3V, I
OUT
= 1A, C
OUT(ESR)
= 80mΩ, C
ff
= 100pF)
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