Datasheet

V
OUT
RIPPLE
(50 mVac/Div)
Switch Node Voltage, V
D1
(10V/Div)
I
L
(1A/Div)
TIME (2 Ps/DIV)
0.0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
40
50
60
70
80
90
100
EFFICIENCY (%)
L = 22 PH
R1 = 60.7k
R2 = 20k
V
IN
= 24V
V
IN
= 12V
0.0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
'V
OUT
(%)
V
IN
= 24V
V
IN
= 12V
L = 22 PH
R1 = 60.7k
R2 = 20k
0.0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
40
50
60
70
80
90
100
EFFICIENCY (%)
V
IN
= 4.5V
V
IN
= 24V
V
IN
= 12V
0.0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
'V
OUT
(%)
V
IN
= 4.5V
V
IN
= 24V
V
IN
= 12V
LM3489
LM3489-Q1
www.ti.com SNVS443B –MAY 2006–REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
All curves taken at VIN = 12V with configuration in Design Information. T
J
= 25°C, unless otherwise specified.
Efficiency vs Load Current V
OUT
Regulation vs Load Current
(V
OUT
= 3.3V, L = 22µH) (V
OUT
= 3.3V, L = 22µH)
Figure 14. Figure 15.
Efficiency vs Load Current (V
OUT
= 5V, L = 22µH) V
OUT
Regulation vs Load Current (V
OUT
= 5V, L = 22µH)
Figure 16. Figure 17.
Continuous Mode Operation
Power Up (No Load, C
ADJ
= 1nF) (V
IN
= 12V, V
OUT
= 3.3 V, I
OUT
= 500mA)
Figure 18. Figure 19.
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