Datasheet

V
OUT
RIPPLE
(20 mVac/Div)
Switch Node Voltage, V
D1
(10V/Div)
I
L
(500 mA/Div)
TIME (4 Ps/DIV)
V
OUT
RIPPLE
(50 mVac/Div)
Switch Node Voltage, V
D1
(10V/Div)
I
L
(1A/Div)
TIME (2 Ps/DIV)
0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT (A)
'V
OUT
(%)
-1.0
-0.5
0.0
0.5
1.0
V
IN
= 7V
V
IN
= 28V
V
IN
= 12V
V
IN
= 18V
0.1 0.2 0.3 0.4 0.5 0.6
40
50
60
70
80
90
100
EFFICIENCY (%)
OUTPUT CURRENT (A)
V
IN
= 7V
V
IN
= 28V
V
IN
= 12V
V
IN
= 18V
Typical Performance and Waveforms www.ti.com
7 Typical Performance and Waveforms
All curves taken at V
IN
= 12 V with the demonstration board for V
OUT
= 3.3 V. T
J
= 25°C, unless otherwise
specified.
Efficiency V
OUT
Regulation
vs vs
Load Current Load Current
Continuous Mode Operation Discontinuous Mode Operation
6
AN-1471 LM3489 Demonstration Board SNVA160A–May 2006–Revised April 2013
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