Datasheet

LM2854
www.ti.com SNVS560C –MARCH 2008–REVISED APRIL 2013
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 1 MHz Bode Plot LM2854 500 kHz Bode Plot
V
IN
= 5.0V, V
OUT
= 1.8V, I
OUT
= 4A V
IN
= 5.0V, 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 L
OUT
= 1.5 µH, C
OUT
= 100 µF ceramic
Figure 26. Figure 27.
LM2854 1 MHz Bode Plot LM2854 500 kHz Bode Plot
V
IN
= 5.0V, V
OUT
= 3.3V, I
OUT
= 4A V
IN
= 5.0V, V
OUT
= 3.3V, I
OUT
= 4A
R
FB1
= 150 kΩ, R
COMP
= 1 kΩ, C
COMP
= 68 pF, R
FB1
= 250 kΩ, R
COMP
= 1 kΩ, C
COMP
= 33 pF,
L
OUT
= 0.82 µH, C
OUT
= 100 µF ceramic L
OUT
= 1.5 µH, C
OUT
= 100 µF ceramic
Figure 28. Figure 29.
LM2854 500 kHz Power On Characteristic LM2854 500 kHz Power On via Enable
V
IN
= 5.0V, V
OUT
= 1.8V, I
OUT
= 4A, C
SS
= 220 pF V
IN
= 5.0V, V
OUT
= 1.8V, I
OUT
= 4A, C
SS
= 220 pF
Figure 30. Figure 31.
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