Datasheet

0 4
92
93
94
95
96
97
98
99
EFFICIENCY (%)
LOAD CURRENT (A)
1 2 3
V
IN
= 5.0V
V
IN
= 4.0V
0 4
84
86
88
90
92
94
96
98
EFFICIENCY (%)
LOAD CURRENT (A)
1 2 3
V
IN
= 5.0V
V
IN
= 3.3V
0 4
90
99
EFFICIENCY (%)
LOAD CURRENT (A)
1 2 3
91
92
93
94
95
96
97
98
V
IN
= 3.3V
V
IN
= 5.0V
0 4
80
82
84
86
88
90
92
94
96
EFFICIENCY (%)
LOAD CURRENT (A)
1 2 3
V
IN
= 3.3V
V
IN
= 5.0V
LM2854
SNVS560C –MARCH 2008–REVISED APRIL 2013 www.ti.com
Typical Performance Characteristics (continued)
Unless otherwise specified, the following conditions apply: VIN = PVIN = AVIN = EN = 5.0V, C
IN
is 47 µF 10V X5R ceramic
capacitor, L
O
is from TDK SPM6530T family; T
AMBIENT
= 25°C for efficiency curves, bode plots and waveforms, and T
J
= 25°C
for all others.
LM2854 500 kHz Efficiency vs. LM2854 500 kHz Efficiency vs.
I
OUT
V
OUT
= 2.5V, L
O
= 2.2 µH, 16 mΩ DCR I
OUT
V
OUT
= 1.2V, L
O
= 1.5 µH, 9.7 mΩ DCR
Figure 20. Figure 21.
LM2854 500 kHz Efficiency vs. LM2854 500 kHz Efficiency vs.
I
OUT
V
OUT
= 3.3V, L
O
= 1.5 µH, 9.7 mΩ DCR I
OUT
V
OUT
= 1.8V, L
O
= 1.5 µH, 9.7 mΩ DCR
Figure 22. Figure 23.
LM2854 1 MHz Bode Plot LM2854 500 kHz Bode Plot
V
IN
= 3.3V, V
OUT
= 1.8V, I
OUT
= 4A V
IN
= 3.3V, V
OUT
= 1.8V, I
OUT
= 4A
R
FB1
= 150 kΩ, R
COMP
= 1 kΩ, C
COMP
= 100 pF, R
FB1
= 250 kΩ, R
COMP
= 1 kΩ, C
COMP
= 47 pF,
L
OUT
= 0.82 µH, C
OUT
= 100 µF ceramic L
OUT
= 1.5 µH, C
OUT
= 100 µF ceramic
Figure 24. Figure 25.
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